भारतीय मानक IS 1367 (Part 17) : 2023

ISO 3269 : 2019

Indian Standard

चूड़ीदार इस्पात बंधन सामाग्री की तकनीकी

आपूर्ति शतें
भाग 17 र्नरीक्षण, प्रर्तचयन तथा स्वीकारण प्रर्िया
( प ांचव ां पनु रीक्षण )

Technical Supply Conditions for

Threaded Steel Fasteners
Part 17 Inspections, Sampling and
Acceptance Procedure
( Fifth Revision )

ICS 21.060.10

 BIS 2023
 ISO 2019

भारतीय मानक ब्यरू ो

BUREAU OF INDIAN STANDARDS
मानक भवन, 9 बहादरु शाह ज़फर मार्ग, नई ददल्ली - 110002
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI - 110002
www.bis.gov.in www.standardsbis.in

March 2023 Price Group 7

General Engineering and Fasteners Standards Sectional Committee, PGD 37

NATIONAL FOREWORD

This Indian Standard (Part 17) (Fifth Revision) which is identical with ISO 3269 : 2019 ‘Fasteners — Acceptance
inspection’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian
Standards on recommendation of the General Engineering and Fasteners Standards Sectional Committee and approval
of the Production Engineering Division Council.

This standard was originally published in 1961 and subsequently revised in 1967, 1979, 1996 and 2000. Third revision
of this standard was identical with ISO 3269 : 1988. Fourth revision of this standard was identical with
ISO 3269 : 2000. The fifth revision of this standard has been undertaken to align it with the latest version of
ISO 3269 : 2019.

The major changes in this revision are as follows:

a) Introduction of an additional approach for incoming inspection with smaller sample sizes based on NA = 0;
b) Use of a reference approach in case agreement is not reached;
c) Sample size specified on the basis of lot size insert; and
d) Addition of informative Annexes A and B explaining the basis for sample size selection.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations.
Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn
to the following:
a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian
Standard’.
b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a
point (.) as the decimal marker.

In this adopted standard, reference appears to certain International Standards for which Indian Standards also
exist. The corresponding Indian Standards, which are to be substituted in their respective places, are listed below
along with their degree of equivalence for the editions indicated:

International Standard Corresponding Indian Standard Degree of Equivalence

ISO 2859-1 Sampling procedures for IS 2500 (Part 1) : 2000 Sampling Identical with
inspection by attributes — Part 1: procedures for inspection by attributes: ISO 2859-1 : 1999
Sampling schemes indexed by Part 1 Sampling schemes indexed by
acceptance quality limit (AQL) for lot- acceptance quality limit (AQL) for lot-by-
by-lot inspection lot inspection (third revision)

ISO 3534-2 Statistics — Vocabulary IS 7920 (Part 2) : 2012 Statistics — Identical with
and symbols — Part 2: Applied Vocabulary and symbols: Part 2 Applied ISO 3534-2 : 2006
statistics statistics (third revision)

(Continued on third cover)

 IS 1367 (Part 17) : 2023
ISO 3269 : 2019

Contents Page

Introduction................................................................................................................................................................................................................................iv
1 Scope.................................................................................................................................................................................................................................. 1
2 Normative references....................................................................................................................................................................................... 1
3 Terms and definitions...................................................................................................................................................................................... 1
4 Symbols........................................................................................................................................................................................................................... 2
5 Incoming acceptance inspection procedures for fasteners...................................................................................... 2
5.1 General requirements........................................................................................................................................................................ 2
5.2 Inspection procedures....................................................................................................................................................................... 3
5.2.1 General...................................................................................................................................................................................... 3
5.2.2 Sample size............................................................................................................................................................................ 3
5.2.3 Inspection modalities................................................................................................................................................... 3
5.3 Acceptance inspection categories........................................................................................................................................... 3
6 Result of inspection and disposition................................................................................................................................................ 5
6.1 General............................................................................................................................................................................................................ 5
6.2 Purchaser's options for lot disposition............................................................................................................................... 6
6.3 Reference acceptance procedure............................................................................................................................................. 6
Annex A (informative) Sampling plans basics............................................................................................................................................. 7
Annex B (informative) Operating characteristic of sampling plans...................................................................................... 9
Bibliography.............................................................................................................................................................................................................................. 10

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Introduction
The manufacturer of fasteners is expected to take due care and apply process control (see ISO 16426)
during production in order to minimize the chances of producing parts that do not satisfy requirements
of the standard or technical specification to which they are specified. Although every fastener should
meet all the specified requirements, this objective is not guaranteed in mass production.
The purchaser of fasteners is expected to decide whether it is reasonable to assume that the delivered
fasteners were made to specification. Considering the limitations of inspection by attributes of a
fastener inspection lot, it is desirable that both the purchaser and the manufacturer (or supplier)
possess a clear understanding of the acceptance inspection procedure to be used by the purchaser. This
document describes an inspection procedure for use by the purchaser where no prior agreement exists.
Such acceptance inspection cannot provide complete confidence that non-conforming fasteners do
not exist within a production lot. Conversely, the acceptance of a lot based on acceptance quality limit
(AQL) values in this document does not imply that the supplier has a right to knowingly supply non-
conforming fasteners.
This fourth edition introduces a layered approach for incoming acceptance inspection that begins with
small sample sizes associated with a sampling plan based on Ac = 0.

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 IS 1367 (Part 17) : 2023
ISO 3269 : 2019
Indian Standard

TECHNICAL SUPPLY CONDITIONS FOR THREADED STEEL

FASTENERS
PART 17 INSPECTIONS, SAMPLING AND ACCEPTANCE PROCEDURE
( Fifth Revision )

1 Scope
This document specifies an inspection procedure to be used by the purchaser where no prior
agreement exists.
It also specifies a reference acceptance procedure for acceptance or rejection of an inspection lot,
when no agreement can be reached between the purchaser and the supplier, or where conformance to
specification is disputed.
It applies to inspection lots of bolts, screws, studs, nuts, pins, washers, rivets and other related fasteners.
This document applies to fasteners not intended for high volume machine assembly, special-purpose
applications or specially engineered applications requiring more advanced in-process control and lot
traceability.
For in-process control or final inspection by the manufacture and sorting, see ISO 16426.

2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1891-4, Fasteners — Vocabulary — Part 4: Control, inspection, delivery, acceptance and quality
ISO 2859-1:1999, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 3534-2, Statistics — Vocabulary and symbols — Part 2: Applied statistics

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1891-4, ISO 2859-1 and
ISO 3534-2 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:​//www​.iso​.org/obp
— IEC Electropedia: available at http:​//www​.electropedia​.org/
3.1
inspection lot
quantity of fasteners of the same designation received from the same supplier at the same time and, if
available, of the same manufacturing lot number
3.2
characteristic
dimensional element, mechanical, physical or functional property or other recognizable product feature
for which limits are specified
EXAMPLE Head height, body diameter, tensile strength or hardness.

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3.3
acceptance quality limit
AQL
acceptable percentage of non-conforming fasteners in an inspection lot (3.1) corresponding to a specific
probability of acceptance defined in the AQL index
Note 1 to entry: AQL95 is the percentage of non-conforming fasteners where the inspection lot has a 95 % chance
of being accepted by the purchaser under the sampling plan; in other words, the supplier’s risk of rejection is less
than 5 %.

3.4
limiting quality
LQ
percentage of non-conforming fasteners in an inspection lot (3.1) corresponding to a specific probability
of acceptance defined in the LQ index
Note 1 to entry: LQ10 is the percentage of non-conforming fasteners where the inspection lot has a 10 % chance
of being accepted by the purchaser under the sampling plan; in other words, the consumer’s risk of accepting the
lot is less than 10 %.

Note 2 to entry: For a given sampling plan, limiting quality (LQ) and acceptance quality limit (AQL) are linked in
the corresponding operating characteristic (OC) curve.

4 Symbols
For the purposes of this document, the following symbols apply.

Ac acceptance number

Re rejection number

LQ10 limiting quality at 10 % probability of acceptance, in per cent

AQL95 acceptance quality limit at 95 % probability of acceptance, in per cent

N lot size

Pa probability of acceptance, in per cent

5 Incoming acceptance inspection procedures for fasteners

5.1 General requirements

The requirements of this document shall apply to fasteners as delivered by the supplier, i.e. without
alteration from the as-delivered condition. In case of alteration or further processing performed by the
purchaser, the purchaser shall assume responsibility for conformance of all characteristics altered by
such processing.
This document applies after receiving the fasteners, before releasing the lot to any subsequent
processing.
Inspections according to this document shall be performed in accordance with Tables 1 and 2.
In case of non‑conformity found during inspection, 6.2 and/or 6.3 shall apply.
The purchaser shall give the supplier the opportunity to verify any alleged non‑conformity prior to any
disposition.

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5.2 Inspection procedures

5.2.1 General

The purchaser can choose this document to verify that the fasteners comply with the technical
requirements of the product standard or other specified requirements.

5.2.2 Sample size

Sample size shall be based on the size of the inspection lot specified in Table 1. If the sample size is
greater than the lot size, 100 % inspection is required for non-destructive tests.
Sample size, acceptance number, Ac, and rejection number, Re, for each selected characteristic shall be
determined individually.

5.2.3 Inspection modalities

Inspection category for the characteristic being inspected shall be in accordance with Table 2, which
lists the primary characteristics of various fastener types.
The selection of the characteristics for inspection shall be at the discretion of the purchaser. The
purchaser is not required to inspect all characteristics listed in Table 2. The purchaser shall decide which
characteristics to inspect based on their impact on the form, fit and function of the fasteners used.
The purchaser can select any other characteristics specified in the relevant product standard or in
other technical specifications for inspection.
NOTE The frequency and extent of acceptance inspection are at the discretion of the purchaser and are
related to previous experience with the supplier and the purchaser’s opinion of the critical nature of the fastener
and its application.

Mechanical, physical and functional properties shall be inspected as specified in the relevant basic and
reference standards (e.g. ISO 898-1, ISO 3506-2, ISO 16047, ISO 10683, ISO 6157-1).
Dimensional characteristics shall be inspected in accordance with relevant product standards and/or
technical specifications.
The inspection of a listed mechanical, physical or functional characteristic can include several tests
and/or test results (e.g. tensile strength may be tested using full-size, wedge tensile or specimens).
A listed dimensional characteristic can include several features (e.g. inspecting the drive for a hexagon
head includes measuring width across flats, width across corners and minimum wrenching height).

5.3 Acceptance inspection categories

Table 1 specifies sampling plans for acceptance inspection. Categories 1, 2 and 3 are explained in
Annex A. Category 3 sampling plans are selected from ISO 2859-1.
For more information on sampling concept, see Annex B.

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Table 1 — Sampling plan

Sample size, acceptance number, Ac, and rejection number, Re
Category 1a Category 2b Category 3c
Lot size, N Additional
Initial sample
sample
Ac = 0 Re = 1 Ac = 0 Re = 2 Ac = 0 Re = 1
2 to 50 1 4 4 Not applicable
51 to 90 1 5 5 5 Ac = 1 Re = 2
91 to 150 1 6 6 6 Ac = 1 Re = 2
151 to 280 1 7 7 7 Ac = 1 Re = 2
281 to 500 2 9 9 9 Ac = 1 Re = 2
501 to 1 200 2 11 11 11 Ac = 1 Re = 2
1 201 to 3 200 2 13 13 13 Ac = 1 Re = 2
3 201 to 35 000 3 15 15 15 Ac = 2 Re = 3
35 001 to 500 000 5 20 20 20 Ac = 2 Re = 3
Over 500 000 8 20 20 20 Ac = 2 Re = 3
a Category 1 – characteristics for which the acceptance number, Ac, is zero. Category 1 characteristics include all
mechanical and functional properties which are typically inspected by means of destructive tests. If non‑conformity is
found in the sample, the lot or shipment is rejected. Disposition according to 6.2 and/or 6.3 shall apply.
b Category 2 – characteristics for which the acceptance number, Ac, is zero, but in case of a non‑conformity, a second
sample may be taken. Category 2 characteristics are major dimensional properties that can affect the fit or function of the
fastener. If, however, a single non‑conformity is found in the first sample, an additional sample equal to the first sample
size shall additionally be inspected for that characteristic. If zero non‑conformity is found in the additional sample for that
characteristic, the lot is accepted. If the lot or shipment is rejected, disposition in accordance with 6.2 and/or 6.3 shall apply.
c Category 3 – characteristics for which the acceptance number, Ac, is one non‑conformity or more, as specified in
Table 2. Category 3 characteristics are minor dimensional properties and certain functional properties where some degree
of non‑conformity is tolerated. If more than the specified acceptable non-conformities are found in the sample, the lot or
shipment is rejected. Disposition in accordance with 6.2 and/or 6.3 shall apply.

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Table 2 — Designated inspection categories

Externally Internally
Fastener characteristics threaded threaded Washers Pins Rivets
fasteners fasteners
Hardness 1 1 1 1 1
Tensile strength 1 — — — —
Mechanical Proof load — 1 — — —
and physical Breaking torque 1 — — — —
properties
Shear strength — — — 1 1
Others (including material and
1 1 1 1 1
surface discontinuities)
Drive, recess and slot 2 2 — — —
Height 2 2 2 2 2
Shank diameter 2 — — 2 2
Length, thread length 2 — — 2 2
Thread diameter d, D (external
Dimensional diameter for externally thread-
2 2 — — —
characteristics ed parts, internal diameter for
internally threaded parts)
Internal diameter — — 2 — —
External diameter — — 2 — —
Thickness — — 2 — —
Others 3 3 3 3 3
Prevailing torques 3 3 — — —
Torque/clamp force relationship 3 3 — — —
Functional
Thread GO gauging 3 3 — — —
properties
Others (destructive tests) 1 1 1 1 1
Others (non-destructive tests) 3 3 3 3 3

6 Result of inspection and disposition

6.1 General
If no non‑conformity is found with the samples inspected and/or tested, the inspection lot shall be
accepted.
For categories 2 and 3, if non-conformities are found but satisfy the acceptance number (Ac) criteria
specified in Table 1, the inspection lot shall be accepted.
NOTE Lot acceptance in accordance with this document does not presume that the accepted lot is free of
non-conforming parts (see Introduction).

If non‑conformities are found that exceed the acceptance number (Ac) criteria specified in Table 1, the
purchaser shall reach a disposition agreement with the supplier in accordance with 6.2.
If the purchaser and supplier cannot agree on the acceptance or rejection of an inspection lot in
accordance with 6.2, they shall apply disposition in accordance with 6.3.
Non‑conformities shall be declared on the basis of appropriate test, measurement and/or gauging
methods and related appropriate equipment.

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6.2 Purchaser's options for lot disposition

In case of non‑conformity found by performing inspection in accordance with 5.2, the purchaser shall
choose from the following options:
If the purchaser assumes that the non‑conformity will have no significant effect on the performance in
the intended service application:
a) the purchaser accepts the inspection lot.
Otherwise, the following options can be chosen:
b) return the lot to the supplier;
c) sort and/or inspect the lot to remove the non-conforming parts;
d) rework or reprocess the parts to correct the non‑conformity;
e) scrap the lot.
The purchaser shall have approval from the supplier before any activity, such as sorting, reworking,
reprocessing, scrapping, or returning the lot, when such action impacts the supplier.
A non-conforming lot of fasteners shall not be presented for re-inspection until one of the options above
has been completed.

6.3 Reference acceptance procedure

If the purchaser and supplier cannot agree on the acceptance or rejection of an inspection lot in
accordance with 6.2, for example if the validity of the testing is questioned, the parties shall select a
mutually agreed upon competent third party laboratory to test the non-conforming characteristic as
specified above. The additional third-party inspection results shall serve as the basis for the purchaser
and supplier to agree upon one of the options in 6.2.

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Annex A
(informative)

Sampling plans basics

Acceptance inspection is generally performed by the purchaser to confirm by inspection whether

it is reasonable to assume that the delivered fasteners were made to specification. Table 1 provides
acceptance inspection sampling plans for three categories of characteristics based on different
statistical approaches having different customer and supplier risk consequences. The selection of
a sampling plan and suitable tests are the responsibility of the party conducting the acceptance
inspection.
Category 1 characteristics are for mechanical properties that are critical to the function of the fastener.
It is assumed that a process parameter deviation in mass production will lead to non‑conformity in
a substantial proportion of the lot and is expected to be detected in a small sample. Based on this
assumption, acceptance inspection sampling plans for category 1 properties require acceptance number
Ac = 0 and do not provide statistical information. When non‑conformity is found, in-depth investigation
is required to reach agreement about disposition of the lot (see Clause 6).
Category 2 characteristics are for dimensional properties that can influence the usability of the fastener.
It is assumed there is a statistical distribution of the characteristic resulting from normal variation in
production processes. Category 2 sampling plans are based on acceptance number Ac = 0; however,
a single non‑conformity does not automatically require rejection of the lot. An additional sampling
with the same acceptance number Ac = 0 increases confidence in conformance of the lot while avoiding
rejections based on a single detected non‑conformity.
Sample sizes for category 2 characteristics are selected to provide "consumer risk" similar to a 6,5 AQL
plan and are selected from OC curves for single sampling plans shown by Reference [7]. The term
“consumer risk” is described by values for the quality level expressed in percentage of non-conforming
parts, with a 10 % probability of being accepted. See Table A.1 (LQ10). The term “supplier risk” is
described by values for the quality level expressed in percentage of non-conforming parts, with a 95 %
probability of being accepted. See Table A.1 (AQL95). These values apply only for single inspection.
Taking an additional sample after finding a non-conforming part in first sample is not considered.
Category 3 characteristics are for dimensional properties and certain functional properties where
some degree of non‑conformity is tolerated. It is assumed that there is a statistical distribution of the
characteristic resulting from normal variation in production processes. Category 3 sampling plans
are based on an acceptance number, Ac, greater than zero. Sample sizes for Category 3 characteristics
are chosen from ISO 2859-1:1999, Table 1, level S3. Ac values connected with AQL95 are taken from
ISO 2859-1:1999, Table 2‑A.

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IS 1367 (Part 17) : 2023
ISO 3269 : 2019

Table A.1 — Sampling plans – Consumer risk LQ10 – Supplier risk AQL95
Category 2 (1st inspection run) Category 3
Ac = 0 LQ10 AQL95 AQL95
Lot size, N Sample Acceptance
Sample size number
Pa = 10 % Pa = 95 % Pa = 95 %
size
2 to 50 4 42,44 1,25 NA —
51 to 90 5 36,10 1,00 5 Ac = 1 7,6
91 to 150 6 31,33 0,83 6 Ac = 1 6,2
151 to 280 7 27,73 0,72 7 Ac = 1 5,3
281 to 500 9 22,39 0,56 9 Ac = 1 4,1
501 to 1 200 11 18,80 0,46 13 Ac = 1 3,3
1 201 to 3 200 13 16,10 0,39 13 Ac = 1 2,8
3 201 to 35 000 15 15,40 0,33 15 Ac = 2 5,7
35 001 to 500 000 20 10,9 0,26 20 Ac = 2 4,2
Over 500 000 20 10,9 0,26 20 Ac = 2 4,2

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 IS 1367 (Part 17) : 2023
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Annex B
(informative)

Operating characteristic of sampling plans

The following presents the relationship existing between the sampling plan (sample size, acceptance
number) and the AQL and LQ values.
Each sampling plan is described by its operating characteristic (OC) curve (see examples in Figure B.1).
These curves show the probability of acceptance in a sampling inspection as a function of the actual
percentage of non-conforming fasteners in the inspection lot. The points on the operating characteristic
curves indicating a 95 % and a 10 % probability of acceptance have been selected for the determination
of suitable sampling. The 95 % point on the OC curve is required to be greater than or equal to the AQL
value specified. Selection of the 10 % point on the OC curve (LQ10 value) is at the purchaser's discretion.
The LQ10 value corresponds to the percentage of non-conforming fasteners in inspection lots that are
highly likely (90 % probability) to be rejected.
For each single characteristic, a sampling plan 32/1 means that, out of 32 tested fasteners, 1 can show
non-conformity and the lot is still accepted on the basis of a specified figure of AQL95 = 1.

Key
X percentage of non-conforming fasteners

Figure B.1 — Example of operating characteristic (OC) curves for sampling plans for AQL95 = 1

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IS 1367 (Part 17) : 2023
ISO 3269 : 2019

Bibliography

[1] ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts,
screws and studs with specified property classes — Coarse thread and fine pitch thread
[2] ISO 3506-2, Mechanical properties of corrosion-resistant stainless steel fasteners — Part 2: Nuts
[3] ISO 6157-1, Fasteners — Surface discontinuities — Part 1: Bolts, screws and studs for general
requirements
[4] ISO 10683, Fasteners — Non-electrolytically applied zinc flake coating systems
[5] ISO 16047, Fasteners — Torque/clamp force testing
[6] ISO 16426, Fasteners — Quality assurance system
[7] Squeglia Nicholas L., ZERO ACCEPTANCE NUMBER SAMPLING PLANS, fifth edition, ASQ
Quality press, Milwaukee, Wisconsin

10
 (Continued from second cover)

The technical committee has reviewed the provisions of the following Internatinal Standards referred in this adopted
standard and has decided that they are acceptable for use in conjunction with this standard:

International Standard Titile

ISO 1891-4 : 2018 Fasteners — Vocabulary — Part 4: Control, inspection,

delivery, aaceptance and quality

In reporting the result of a test or analysis made in accordance with this standard, if the final value, observed or
calculated, is to be rounded off, it shall be done in accordance with IS 2 : 2022 ‘Rules for rounding off numerical values
(second revison)’.
Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 2016 to promote harmonious
development of the activities of standardization, marking and quality certification of goods and attending to
connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without
the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the
standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to
copyright be addressed to the Head (Publication & Sales), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed
periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are
needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards
should ascertain that they are in possession of the latest amendments or edition by referring to the website-
www.bis.gov.in or www.standardsbis.in.
This Indian Standard has been developed from Doc No.: PGD 37 (18347).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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