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( Reaffirmed 2006 )
 IS : 6607 - 1972

Indian Standard
SPECIFICATION FOR REBATED
MORTICE LOCKS (VERTICAL TYPE)
Bulders.Hardware Sectional Committee, BDC 15

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UDYOG VIHAR GURGAON FOR INTERNAL USE AT THIS LOCATION ONLY
Chaimkan Rcficscnting
SRRI Yusup MOWJEE M. C. Mowjee & Company, Calcutta; and Builders
Hardware Industries Association of India,
Calcutta

Members
SHRI SamB SlMOR ( Aiterna~ to
Shri Yusuf Mowjee )
SHRI D. R. BAWL Engineer-in-Chiefs Branch, Army Headquarters
SHRI P. K. SETHI ( Alternate )
SHRI J. P. BAJAJ Institution of.Engineers ( India), Calcutta
Sxax A. K. B~rx~rn Vertex Manufacturing Company Limited,
Bombay
SHRI H. C. SA~AT ( Ahaate )
SHRI R. M. CHAWNRT Indian Aluminium Company Limited, Calcutta
SHRXJ. K. ANAND ( ANcrnate)
CONTROLLER OF STORES, Railway Board ( Ministry of Railways )
EASTERNRAILWAY
SHRI P. K. DE Des Lock Industries, Calcutta
SHRI R. L. GERLOTE Indian Institute of Architects, Bombay
SHRI K. P. JAIN Engineering Association of India, Calcutta
SHRI V. S. KAMBOJ Jayna Trading Corporation, Delhi
SHRIJ. R. KANSARA Arvind Industries, Jamnagar ( Gujarat )
SHRI V. S. KAMBOJ( Alfernafc )
SHRI S. C. KAPOOR Directorate General of Supplies & Disposals
( Ministry of Supply )
SHRI S. D. MAJUMDAR National Test House, Calcutta
SHRI AJOYENDUPAUL Gob~~nut~heet Metal Works and Foundry,

DR A. V. R. Rno National Buildings Organization, New Delhi

SURVEYOROF WORKS (I) Central Public Works Department, New Delbi
SHRI D. AJITHASctfm, Director General, IS1 ( ikojicio Member)
Director ( Civ Engg )
Secre tqy
SHRI S. P. MAGGU
Senior Technical Assistant ( Civ Engg ), IS1
( Conrinurdon &gr 2 )

INDIAN STANDARDS INSTITUTION

MANAK BHAVAN, 9 BAJ3AlXJR SHAH ZAFAR MARG
NEW DELHI 110002
IS:6607-1972
( Conhwedfrom jaga 1 )

Locks and Latches Subcommittee, BDC 15 : 3

Convener Represenhg
SHRI J. R. SACHDEVA Defence Production Organization ( Ministry of
Defence )

Members
SHRI K. C. MISRA ( Alternate to

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Shri J. R. Sachdeva )

UDYOG VIHAR GURGAON FOR INTERNAL USE AT THIS LOCATION ONLY

SHRI MAHABIRPRASADAOARWAL Gopal Metal and Wood Works, ALigarh
SHXIR. C. BHATTACHARYYA Directorate of Industries, Government of West
Bengal
SHRI A. K. BHIMAN'I Vertex Manufacturing Co Ltd, Bombay
SHRI H. C. SAMPAT (Al!ernate)
SHRI P. K. DE Des Lock Industries, Calcutta
SHRI S. F. DESAI Godrej & Boyce Mfg Co Pvt Ltd, Bombay
SHRI VINOD KTJMARJAIN P.P. Products, Aligarh
SHRl u. c. LALL Hemu Productions ( India), Calcutta
SHRI S. P. JHUNJHUKWALA( Alternate )
SHRX MOHAN SINGH Eastern Commercial & Industrial Enterprises Pvt
Ltd, Bombay
SHRI S. S. GANDHI ( Altemafe)
SHIU N. P. SArPATi Directorate of Industries, Government of
Mabarashtra
SHRX G. S. SUBBARAMAN Directorate General of Supplies & Disposals
( Ministry of Supply )
SHRI YUSUP MOWJEE M. C. Mowjee & Co, Calcutta
SHRX SAHIB SWGH ( Alternate)
 IS:6607-1972

Indian Standard
SPECIFICATION FOR REBATED
MORTICE LOCKS ( VERTICAL TYPE )

0. FOREWORD

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UDYOG VIHAR GURGAON FOR INTERNAL USE AT THIS LOCATION ONLY
0.1 This Indian Standard was adopted by the Indian Standards Institution
on 4 August 197.2, after the draft finalized by the Builders Hardware
Sectional Committee had been approved by the Civii Engineering Division
Council.
0.2 Mortice locks have become popular and are being used in all modern
buildings specially where flush doors are provided. Certain situations
demand the use of double leaf doors and ordinary mortice locks cannot
serve the purpose because of the special rebate pattern involved. To cater
to the specific problem of double leaf doors, rebated mortice locks have to
be provided. It is with. this edd in view that this standard is being
issued.

0.3 Wherever reference to mortice lock appears in the standard it shall

mean a rebated mortice lock.

0.4 In the formulation of this standard due weightage has been given to
international co-ordination among the standards and practices prevailing
in different countries in addition to relating it to the practices in thefield
in this country.

0.5 This standard contains clauses 2.2, 5.1.1,7.1.2,8.1,9.1.1 and 10.1

which permit the purchaser to use his option for selection to suit his
requirements and clauses 6.1 and 6.2 and Appendix A which require the
purchaser to supply certain technical information at the time of placing
orders.

0.6 This standard is one of a series of standards on builders hardware.

0.7 While preparing this standard, the Sectional Committee took note of
the acute scarcity of non-ferrous materials like copper, zinc and other
alloys in the country and the need for conserving the use of the same in
the national interest. However, in view of the demand for hardware
items made of these materials in overseas markets, the Sectional Committee
has retained them specifically to meet the requirements of export trade.
For all indigenous use, it is recommended that hardware items made out
of these materials should not be used.

3
IS : 6607 - 1972

0.8 For the purpose of deciding whether a particular requirement of this

standard is complied with, the final value, observed or calculated, express-
ing the result of a test or analysis, shall be rounded off in accordance
with IS : 2-1960*. The number of significant places retained in the round-
ed off value should be the same as that of the specified value in the
standard.

1. SCOPE

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1.1 This standard lays down the requirements for rebated mortice locks
suitable for use on double leaf doors with rebated meeting stiles.

2. SIZE

2.1 The sizes of mortice locks shall be as follows:

65 mm, 75 mm and 100 mm.

2.1.1 The size of the lock- shall be denoted by the overall length of
the body measured from the outside face of the fore end to the rear end
( see Fig. 1). The measured length shall not vary more than & 3 mm
from the length specified for the size.
2.2 Mortice locks ofsizes other than those specified in 2.1 may be supplied
by mutual agreement between the purchaser and the supplier.

3. MATERIAL

3.1 Material used for different component parts of the locks shall comply
with the reqmrements given in Table 1 (see P 8, 9, 10 and 11 ).

4. SHAPE

4.1 The shape, design and mechanism of mortice locks and its component
parts indicated in Fig. 1 are illustrative only. The manufacturer may
make mortice locks of other shapes to suit his design.

5. DIMENSIONS

5.1 The leading dimensions of the mortice locks ( suitable for double-leaf
doors ) shall be normally as given in Fig. 1.

5.1.1 It may be manu

between the manufactur
*Rules for rounding off numerical values ( rc&d ).

4
 1.25 MIN THICK

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f LEVER SPRING
FULCRUM PIN

ASSEMBLY WITHOUT @ BODY

BOQY COVER

(I) Body (5) Lever

(2) Case/Face Plate (6) Latch Spring
(3) Locking Bolt (7) Follower
(4) Latch Bolt

4g.

II
I

@ LATCII BOLT

tl
_@_
j-+25-
@ CASE/FACE PLATE STRIKING PLATE
+===s@ LOCKING BOLT

@ LEVER LATCH SPRING

\-8mmSQ HOLE FOR

CONNECTING ROD

@ FOLLOWER KEY
All dimensions in millimetres.
5;
FIG. 1 TYPICALDESIGN OF REBATED MORTICE LOCK ( VERTICALTYPE ) ;1
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As in the Original Standard, this Page is Intentionally Left Blank
 IS : 6607 - 1972

6. NON-INTERCHANGEABILITY

6.1. Two-Lever Locks - The mortice locks shall be manufactured to have

non-interchangeable keys in a batch consisting of a minimum of 24 locks.
In case a non-interchageability in a higher number is required, it shall be
so specified by the purchaser at the time of placing the order. A master-
key may be supplied if required by the purchaser.

6.1.1 For the purpose of testing non-interchangeability, six locks from

each batch of 24 locks shall be so selected that the wards of the keys differ

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from each other slightly. These locks shall then be tested for non-inter-
changeability. If key of any of the locks opens any other lock, amongst the
six locks, the whole lot shall be rejected.
6.2 Locks with More Than Two Levers - The mortice locks shall be
manufactured to have non-interchangeable keys in a batch consisting of a
minimum of IO0 locks. In case, non-interchangeability in a higher number
is required, it shall be so specified if required by the purchaser.

6.2.1 For the purpose of testing non-interchangeability 12 locks from

each batch of 100 locks shall be so selected that the wards of the keys differ
from each other slightly. These locks shall then be tested for non-inter-
changeability. If key of any one of the locks opens any other lock, amongst
the 12 locks, the whole lot shall be rejected.

7. MANUFACTURE

7.1 Lock

7.1.1 Body - The depth of the body shall not be more than 15 mm.

7.1.2 Rebated Fore End - The case plate may itself form the rebated fore
end. In case desired by the purchaser, in order to obtain a clean finish
free from rivets, etc and to assist in decorating the rebate a rebated face plate
may be provided. The rebated face plate shall be normallyfitted to the body
by suitable countersunk head machine screws conforming to IS : 1365
]gtj8* or by any other suitable device. In order to secure the rebated face
plate threaded lugs shall be firmly attached to the case plate by either
riveting or electric resistance welding or similar other suitable means.
7.1.2.1 In case of reversible mortice locks the rebated fore-end shall
be so designed that the fore-end can be fixed in any direction by reversing
its position through 180 degrees without causing any obstruction or
deterioration in the working of the lock or the latch bolt. In case of
reversible rebated mortice locks the size oflatch and lock bolt in cross-section
shall be similar to each other.

*Specification for slotted countersunk head and slotted raised countersunk head screws
( dia range I.6 to 20 mm ) ( second revision j.

7
 ._ . ..-
._ - ------.---

-.._---- --.--_ ___

irAJtJ.E J REQIJII?J?IlENTS FOR I\IATJLJIJALS FOR C:OhlPONbNT PARTS OF MORTIC:E LOCKS g

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s
((:lnrcs~~ 3.1, 7.15, 7.2.1 and 7.2.3) t

(;OhIPONEhT

(1) (2) (3) (4) (5)

Jbdy, body cover, cast

plate, key. facr
striking
locking and latch bolt

C3

ii)

iii1
 iV) Brass sheet Body, body cover, case The brass sheet shall meet Cast brasr cast from melt-
plate, face plate, lever the same bend test as ing sheet cuttings and
and striking plate specified for mild steel brass utensils may be
used. Grade CuZn 40 of

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IS : 410-19670

v) Extruded brass Locking bolt and latch Copper contents shall not IS : 319~196811
bolt t~;~less than 55 percent
tensile strength
35 kgjmms, Min

Alum&urn alloy Body, body cover, follower - IS Designation A-5-M or

vi)
castings and key A-6-M of IS : 617-19597
vii) Aluminium alloy sheet Body, body cover, case - IS Designation NS 4 or
plate, striking plate, HS 20 ofIS : 737-1965**
lever and face plate
-
viii) Extruded aluminium Locking bolt and latch IS Designation HE 30-WP
alloy bolt of IS : 733-1967tt

W
*Specification for hot rolled carbon steel sheet and strip (sccandre&ion ).
tspecification for blackheart malleable iron castings.
$$ecification for brass ingots and castings ( mised).
@pecification for rolled brass plate, sheet, strip and foil ( second revision).
IlSpecification for free-cutting brass rods and sections ( second reoision ).
~Specification for aluminium and aluminium alloy ingots and castings for general engineering purposes (revised).
**Specification for wrought aluminium and aluminium alloys, sheet and strip (for general engineering purposes)
( revised ) .
tl
ttspecification for wrought aluminium and aluminium alloys, bars, rods and sections ( for general engineering purposes ) ..
(first revision ) .
%
3
( Conhud)
s
s
 tf
..

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ch

UDYOG VIHAR GURGAON FOR INTERNAL USE AT THIS LOCATION ONLY

TABLE 1 REQUIREMENTS FOR MATERIALS FOR COil&PONENT PARTS OF MORTICE LOCKS - Conki
g

SL MATERIAL COMPONENT- REQUIREMENTSFOR TYPICAL

No. MATERIAL EXAMPLE

0) (2) (3) (4) (5)

ix) Leaded tin bronze Follower and key - Grade 2 of IS : 318-1962*

x) Zinc base alloy Body, body cover, - IS : 742-19667

pressure die casting follower, face plate,
striking plate, locking
G bolt and latch bolt

xi) Phosphor bronze Lever spring and latch The wire used for springs IS : 1385-19682
spring shall comply with the
test given below:

The lever spring shall

be fitted into the lever
as specified under
7.1.6 and shall be
pressed down so as
to touch the top edge
of the lever and
released. This shall
be rrpcatcd six times
minimum. At the end
of the test the spring
shall regain its origi-
nal position
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xii) Steel wire .ing and latch The wire used for sprirlgs Grade 1 or Grade 2 of

UDYOG VIHAR GURGAON FOR INTERNAL USE AT THIS LOCATION ONLY

shall comply with the Is : 4454-1967s
test gi\ en below:

The levrr spring shall

be fitted into the lever
specified under
;:l.S and shall br
prcssrd down so as
to touch the top edge
Of the levrr and
relravd. This shall
be repeated six times
mmlmum. At the end
of the tesr the spring
shall regain its origi-
nal position

E
xiii) Stainless steel Key - Grade 15 Cr 13, 22 Cr
13 or 30 Cr 13 of
IS : 1570-196111

*Specification for leaded tin bronze ingots and castings (revised).

tSprcification for zinc base alloy die castings ( /irsfreuision ).
jS~)rcil~r ation for phosphor bronze rods and bars, sheet and strip, and wirr (J;rst rtvirion ).
$Slvxifi(,:ltion for steel wire, cold formed springs.
I/Slxcikation for schedules for wrought steels for gene,ral engineering p~lrposes.
ISt6607-1972

7.1.2.2 In case dissimilar sections are used for the manufacture of

latch bolts and lockbolts for the reasons of strength the locks shall be
designed as either suitable for left-hand doors or right-hand doors and the
same shall be clearly marked on each lock.
7.1.3 Locking Bolt - The locking bolt shall be made out of a single metal
or a combination of metals recommended for this part in Table 1. The
bolts shall be of section not less than 12 x 16 mm for all sizes of locks.
When steel locking bolt is provided, it shall be adequately protected against

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corrosion. In case of non-reversible locks the dimensions of locking bolt
other than specified above may be used. In case of bolts made by casting
the thickness of the bolt at no point in section shall be less than 4 mm. In
case sheet steel is used in the manufacture of locking bolt the thickness of
the steel sheet shall not be less than 1.6 mm.
7.1.4 Mechanism - The locking mechanism shall be of ordinary lever
type or any other type approved by the purchaser.

7.1.5 Leuers - Ordinary lever machanism ( see Fig. 1 ) shall be provided

with not less than two levers.
7.1.5.1 False ( dummy ) leaves shall not be used.

7.1.6 Lever Spring - Each lever shall be fitted with one spring which
shall comply with the materials specified in Table 1. The lever spring
fitted into the lever shall withstand the following test without showing any
sign of permanent set:
The lever spring shall be pressed down so as to touch the top edge
of the lever and released. This shall be repeated minimum six times.

7.1.7 Guide Pin, Lever Pivot Pin and Lever Spring Fulcrum Pin -The
pins shall be SUitd_dy costed when used in conjunction with aluminium
alloy body.
7.1.8 Kvs- Each lock shall be provided with two keys.
7.i.8.1 The key shall function smoothly and without any appreciable
friction in the lock. The keys shall be suitably tied to the lock so that
they are not lost or interchanged in transit. Malleable cast iron keys shall
be protected against corrosion.
7.1.8.2 The lock shall be capable of being opened with the key from
both: inside and outside.

7.1.9 Screw - The body cover shall be fitted to the body by countersunk
head machine screws (see IS : 1365-1968 ). Screws shall be of mild steel
and protected against corrosion,. where necessary. However the screws
may be of aluminium alloy in the case of aluminium alloy bodies.

*Specification for slotted countersunk head and slotted raised countersunk head
scre\+rs
( dia range 1.6 to 20 mm ) (secondrevision).

12
 IS : 6607 - 1972

7.2 Latch
7.2.1 Latch Bolt - The latch bolt shall be of single metal or a combina-
tion of metals recommended for this prrrt in Table 1. The bolt shall be
reversible to enable the Iock to be fixed on right-hand as we!1 as on the left-
hand door. The ho!t shall be of section not less than 12 x 16 mm for ail
sizes of locks. Where steel is provided it shall be adequately protected against
corrosion. In case of non-reversible locks the dimensions of casting of
latch bolt other than specified above may be used. In case of bolts made

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of castings the thickness of the bolt in sectton at no point shall be less than

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4 mm. In case sheet steel is used in the manufacture of latch bolt the
thickness of the steel sheet shall not be less than 1 .G mm.
7.2.2 Follower- It shall have a square hole at the centra to suit
the spindle I+Thich operates the larch bolt. It shall be protected against
corrosion when made from malleable iron.
7.2.3 Latch Spring- Each latch bolt shall be fitted Gth one spring
which shall be of materials as specified in Table 1. The la[ch spring shall
withstand the test as given in 7.1.6 without showing any sign of perma-
nent set.
7.2.4 Striking Plate - The rebated striking plate shall have tlvo rectan-
gular slots to suit the locking bolt and the latch bolt. It shall have two
countersunk holes for fixing it to the rebated end of the door shutter.

8. WORKMANSHIP AND FINISH

8.1 Brass body shall be finished smooth and polished. .Yluminium alloy
body may be anodized if required by the purchaser. The anodic coating
shall not be inferiorto grade AC 15 of IS : 1868-1968. The rebated face
plate and the striking plate may be polishrd, stained, chromium plated or
oxidised. Steel body shall be _b
Given a suitable protective coating. Steel
parts before painting shall be given the protective treatment in accordance
with 8.1.1 and 8.1.2.
8.1.1 All dents, burrs and sharp edges shall be removed TIXXI-,:hls v.+ri!>us
components and t!ley shall IX pick!ed, scrubl,ed and rinsed to rcrnove
grease, rust, scale or any other foreign elemcmt.
8.1.2 After pickling, all the mild steel parts shall be given phospl~ati,lg
treatment in accordance Tvith IS : 3618-l 966T followed by a coat of iititaj,ie
primer, such as red oxide.
xo~~-Putty shal! br applied to all the surfaces rrquirinq fillinc and &ail conform
to Is:426-!961:. ;1!uminium primer shall conform to IS: 2931-I%+$.
___-_
*Speclficatron for ano~hc coatings on alumm~um (jut rrLision ).

+Specification for phosphate treatment of iron a:~d steel for protection againct corrosioc.
$Specikation for paste filler for colour coats t 7eisrdj.
$Specifkation for read, mixed paint, brushing, al~timinium-zinc oxitlc I zniilosite primer.

13
 IS : 6607 - 1972

8.1.3 Two coats of enamel paint shall then be applied as follows:

a) Undercoat, and
b) Finish coat with synthetic stoving enamel conforming to
IS : 2932-1964* or IS : 2933-1964t.
6.1.3.1 The components shall thereafter be baked at a specified tem-
perature in an oven heated uniformly. The finish shall be smooth and
uniform with a hard and tough film of enamel s,trongly adhering to the
surface. The finish shall be free from all visible defects and shall not chip,

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when tapped lightly with a pointed instrument.

UDYOG VIHAR GURGAON FOR INTERNAL USE AT THIS LOCATION ONLY

9. TESTS
9.1 The fina!ly assembied lock shall withstand the tests specified in 9.1.1
to 9.1.6.
9.1.1 The locking bolt shall be first locked in the forward position. A
load of 40 kg minimum or as agreed to between the manufacturer and the
purchaser shah be applied without shock in the direction perpendicular to
securing face as well as on both the locking faces of protruding bolt in turn.
Then the load shall be applied by means of a fixed steel board 3 mm thick
1~. a rounded edge heid in such a position that the centre line is approxi-
m~trlv 3 mm from the fore-end. A typical arrangement for the purpose
of this test is shown in Fig. 2.

9.1.2 When the spindle with handle is inserted into hole in the follower
and turned, the latch bolt shall draw smoothly into the lock body and
shah be within one millimetre from the face of the fore-end.

9.1.3 When the latch bolt is pressed into the lock body by pressure, the
action shall be smooth and when fully pressed the latch bolt shall not pro-
ject more than one millimetre from the face of the fore-end.

9.1.4 The latch bolt shall be subjected to 50 000 operations .either man-
ually or by mechanical means. At the end of the test the components
should not show any undue movement from their normal position to cause
imnediment to the smooth working of the,mechanism.

9.1.5 1Yhen a key is inserted in key hole from one side of the lock and
turrted to withdraw the locking bolt the action shall be smooth and with-
out impediment. 1Vhen the direction of turn is reversed to lock the lock-
ing bolt then also the action shall be smooth and without impediment.
In the locked position the locking bolt shall project 12 mm from the face
of the fcre-end, although one millimetre free movement is permissible.
~~______.___
*Specification forenamel, synthetic, exterior, Type 1, (a) undercoating, (b) finishing,
colour as required.
tSpecification for enamel exterior, Type 2, (a) undercoating, (b) finishing, colour as
required.

14
 IS:6607-1972

BEAM 75 cm LONG rFJ?ED BEARER

STEEL BAR 75 cm
LONG APPROX

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I II,/ I MOVABLE
WEIGHT

i BASE

1 J
FIG. 2 STRENGTH TEST FOR LOCKING BOLT

In the withdrawn position the locking bolt shall not project more than one
millimetre from the face of the fore-end. The locking bolt shall be worked
by turning key in both the directions several times quickly, limiting the
total number of turns to 50 000. The purpose of this test is to check up
that the components do not move from their normal position to cause
impediment to the smooth working of the mechanism. This test shall be
repeated with the key inserted from the either side of the lock.
9.1.6 When the key is turned to lock the locking bolt at the same time
applying a reasonable pressure by finger on it, after completion of the ke)
rotation the locking bolt shall be positively locked in the forward position.
This test shall be repeated with the key inserted from the other side of the
lock.

10. INSPECTION AND CERTIFICATE OF COMPLIANCE

10.1The purchaser or his representative shall be permitted to inspect
locks in open condition before purchasing, if he so desires.
10.2 Each manufacturer shall furnish? on request a certificate stating that
the mortice locks comply with the requirements of this standard.
10.2.1 The manufacturers certificate shall be implied, if the lock bears
the IS1 Certification Mark ( see II .l.l ).
llL_ _._^.. _. _.._ _.. -

IS : 6607 - 1972

11. MARKING

11.1 Each mortice Iock shall be stamped with the following information:
a) R$anufacturers name or trade-mark,
b) Year of supply ( if specified by the purchaser ),
c) Size of mortice lock,
d) Number of levers, and

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e) Country of origin.

11.~2 The morrice lock may also be marked with the 181 Certification
h4 a rk .

?;OTL -The use of thi TSI Certification Mark is governed by the provisions of the
Indian Standards Instiru,lon ( &I tification Marks ) Act, and the Rules and Regulations
made thereunder. Prese~tce of this mail. on products covered by an Indian Standard
conveys tht assui ancc tha: :i,cy 1LA,
7.nbran produced to comply v:it!i th.e requirements of
that standard, ;ll\der a :+-cjl-d&red system of inspection, testing and quality control
during production. This s)stem, which is devised and supervised by ISI and operated
by the producer, 11:~sthe f:irther safeguard that the piodocts aa actually marketed are
connnuouslv c!:xked L.; 1.51 for conformity to the standard. Details of conditions,
.;nder which a liccncc for the use of the IS1 Certification Mark may be granted to
ma,~ufacturcrs or processor:, may be obtained from the Indian Standards Institution.

I*. ? The keys shall be stamped on the head with the serial number of the
;<;+,

12. PACKING

12.1 Each mortice lock together with its keys shall be wrapped in a paper
and packed in a cardboard box. Each cardboard box should be marked
with the following information:

a) Manufacturers name or trade-mark,

b) Quantity in the package,

c> Country of origin,

4 Year of manufacture,

e) Type of lock, and

4-x
I Size of leek.

13. SAMPLING

13.1 The method of selecting samples of mortice locks shall be as given in

Appendix B.

16
 IS : 6607 - 1972

APPENDIX A
( Clause 0.5 )

INFORMATION TO BE SUPPLIED BY THE PURCHASER

WHEN PLACING AN ORDER FOR SUPPLY OF
MORTICE LOCKS

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A-l. The purchaser shall furnish information

UDYOG VIHAR GURGAON FOR INTERNAL USE AT THIS LOCATION ONLY

to the manufacturer or the
supplier in regard to the following points:
Whether the door is opening inside or outside ( of a person facing
the door when standing outside the room );
Whether the door is with right or left overlap ( of a person facing
the door when-standing outside the room );
Width of stile, if any;
Width of horizontal lockrail, if any;
Thickness of stile, lockrail, if provided, or thickness of shutter
itself;
Depth of rebate; and
Angle of rebate.

NOTE- All locks are usually fitted to the overlapping shutter.

APPENDIX B
( Clause 13.1)
SAMPLING OF MORTICE LOCKS

B-l. SCALE OF SAMPLING

B-l.1 Lot - In any consignment, all the mortice locks of the same type,
size and manufactured from the same material shall be grouped together to
constitute a lot.

B-l.2 Sample Size--The number of mortice locks to be selected from a

lot shall depend upon the size of the lot and shall be in accordance with
co1 1 and 2 of Table 2.

B-1.2.1 Mortice locks for the sample shall be selected at random from at
least 10 percent of the packages subject to a minimum of three packages,
equal number of mortice locks being selected from each such package.

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IS : 6607- 1972

TABLE 2 SCALE OF SAMPLING AND PERMISSIBLE NUMBER OF

DEFECTIVE MORTICB LOCKS
( C&useB-l .2 )

LOT SIZE SAmPLe SlZE htMEMIBLE NUHBZR OI

DEFECTIVZ MORTXCE
Locu

(1) (2) (3)

SUPPLIED BY BOOK SUPPLY BUREAU TO L&T LIMIED ECC DIVISION

UDYOG VIHAR GURGAON FOR INTERNAL USE AT THIS LOCATION ONLY
up to 200 15 0
201 ,, 300 20 1
301 f, 500 30 2
501 ,, 800 40 2
801 and above 50 3
---
B-2. TESTS
&2.X Ail the morticc locks selected as in B-I.2 shall be inspected for
dimerisional requirements ( zee Fig. 1 ) and finish and workmanship
( Jw 5 j and for compIia.qcc-: with tests epecified in 9. Any mortice lock
which fai!s to satisf)? any 3 e or more ofthe rcauireicenls for the &aracta--
&tic-: ::!:a11 be cor,sidered x defective mortice &k.

18
SUPPLIED BY BOOK SUPPLY BUREAU TO L&T LIMIED ECC DIVISION
UDYOG VIHAR GURGAON FOR INTERNAL USE AT THIS LOCATION ONLY