WALLACE DOUGLAS - Doug.Wallace@fcagroup.

com
PETRUCCELLI MARIO - Mario.PETRUCCELLI@crf.it

Doc. No. 52605/02

Property classes of special service
fasteners FCA Italy Class: TMD

FCA US Doc. Type: MS

C
Date: 10-JAN-2018

65
68
om F7
.c d:
up eri
HARMONIZED “CLUSTER” DOCUMENT

ro s
Co-Author

ag - u
Author

This is a document used by FCA

fc 1)
for joint products and processes
@ +
no TC
za (U

Changes
en M
or P

Change Publication Review Description of change

FCA ITALY -- GROUP MATERIALS LABS (CRF) - METALS

level Date Date

.fl :46

This is a
Updated selectedFor
document. FCA Italydetails,
further S.p.A or FCArefer
please US toLLC
thedocument
Description
A 10-JAN-2018 10-JAN-2018 that will be used as it is for
of Changes inside the document. the joint products
do 8
ar 9 0
FCA US -- METALLIC MATERIALS - 5810

on 01

Considerations:
le , 2

1. This is selected specification that will be used by FCA.

10

2. In case of minor changes, this specification will keep the original document number and
will be updated with a new change level (Revision)
er

3. Just when major updates are required the responsible (FCA Italy or FCA US Author), will
have to rewrite it following the requirements, templates and guidelines that prevail at that
b

time. A new code (nomenclature) will be assigned and this document replaced by the
to

new one.
Oc
on
Co-Author Department
Author Department

NOTE: The original document has a watermark indicating that this is a selected specification used by FCA as a common
specification. Technical information corresponds to the last revision published either in ADRESS or beSTandard databases

ANY PRINTED COPY IS TO BE DEEMED AS UNCHECKED; THEREFORE THE UPDATED COPY MUST BE CHECKED IN THE APPROPRIATE WEB SITE

CONFIDENTIAL
THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT FROM THE DEVELOPER AND
COPYRIGHT OWNER. IN CASE OF DISPUTE, THE ONLY VALID REFERENCE IS THE ENGLISH EDITION.
 MATERIAL
PROPERTY CLASSES OF STANDARD
SPECIAL SERVICE FASTENERS 52605/02
Page: 1 / 6
Date: 10-JAN-2018

TMD
5C

Code
86
m F7 6

-
PURPOSE
To specify the characteristics and approved materials for property classes of special service fasteners.

.co d:

Ch.
up ri

A
ro se
ag - u

Revision
fc 1)
o@ C+
an UT

RM
Change Date Description of change
nz (

– 06/15/83 Edition 5  Property classes for R80 IND and 8 SD added;

re PM

serrated flange hexagon nuts provided in property

class for R40 IND.
NO

Approved material range widened. Layout

flo 6

changed. (AS)
o. :4

A 01/02/83 Edition 5  Approved materials for R40 RCT and R50 RCT

THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY
rd 08

FCA ITALY S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS
property classes changed and note 11 added. (AS)

IF THE ITALIAN EDITION IS NOT AVAILABLE OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.
B 06/25/85 Edition 5  Hardness for R40 SD property class changed
R

(was HRB ≥ 79); new approved materials for

na 19

classes R50 SD STAB and R80 SD added. (AS)

leo0, 20

NOT AVAILABLE OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.
TE

C 11/09/87 Edition 5  Note 6 changed.

(AS)
D May '90 Edition 5  R50 SD property class approved material
changed (was C40). (BM)
r1

US

E Feb. '92 Edition 5  Armonized with A.R. 3100.0120 and 9210.0105.

Para. 2: threaded hexagonal rivets added. (GF)
be

– 07/13/01 Edition 6  Fully revised.

(DA)
to


CONFIDENTIAL

A 02/23/04 Edition 6 Production method to R80 SD added.

CL

(FD)
Oc

B 18-NOV-2014 Edition 6  Referance norms update:

- 52605/03 superseded by 52605/01
on

- 9.52605/03 superseded by 9.52605/01

- 52419 superseded by 52419/01 (DC)
Rev.A 10-GEN-2018 Update reference norms:
. 52605/01 superseded by MS.50076 and MS.50077 (DC)

ANY PRINTED COPY IS TO BE DEEMED AS UNCHECKED; THEREFORE THE UPDATED COPY MUST BE CHECKED IN THE APPROPRIATE WEB SITE

PUBLISHED BY FCA ITALY S.p.A. - NORMAZIONE

 Page 2
52605/02 Change
.

| § ”A” : NECESSARY TESTING EQUIPMENT

The necessary testing equipment is the one specified in the Standards listed in § “B”

| §”B”: REFERENCES
|01307 | Pictorial representation, designation, and marking of threads, bolts, screws, and nuts
TFO

5C
|01506 | ISO Metric V threads – Coarse pitch series – Nominal dimensions. TFO

86
|01507 | ISO Metric V threads – Fine pitch series – Nominal dimensions. TFO

m F7 6
|10143/02 | Hexagon high nuts for projection welding severe applications. TPM
|50140 | Ferrous material surface heat treatments case depth selection criteria and surface
characteristics. TMD

.co d:
|52403 | Case hardening steels – Carbon steel C 15. TMD

up ri
ro se
|52405 | Case hardening steels – Carbon steel C 10. TMD

ag - u
|52409 | Case hardening steels – Nickel-chrome steel 12 NC 3. TMD
|52419/01 | Carburizing steels –Nickel-chrome-molybdenum 15 CrNiMo3 [MS.90028]
fc 1)
|52431 | Case hardening steels – Chrome steel 15 Cr 3. TMD
o@ C+

|52505 | Hardening and tempering steel – Carbon steels C 30 – C 40. TMD

an UT

|52518 | Hardening and tempering steel – Chrome-molybdenum 30 CD 4. TMD

RM
|52542 | Hardening and tempering steel – Chrome steel 32 Cr 4. TMD
nz (
re PM

| MS.50076<S>| INTERNALLY THREADED FASTENERS FOR NORMAL USE (HARMONIZED 2 IN 1)

NO

| MS.50077<S>| EXTERNALLY THREADED FASTENERS FOR NORMAL USE (HARMONIZED 2 IN 1)

flo 6

|52605/07 | Grade A2 and A3 stainless steel corrosion resistant fasteners. TMD

o. :4
FCA ITALY S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT
THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY

rd 08

|52606 | Machining and free cutting steels. TMD

IF THE ITALIAN EDITION IS NOT AVAILABLE OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

|52610 | Non-heat-treatable heading and extrusion steels. TMD

R
na 19

|52611 | Cold heading and cold extrusion quality boron steels. Characteristics, requirements
leo0, 20

and tests. TMD

TE
AVAILABLE OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

|52891 | Hot rolled or drawn steels. General-purpose constructional sheet, strip, wire, bar,
shapes and sections. TMD
r1

US

|9.52605/01 | Threaded fasteners for standard or special applications. TMD

be
to
CONFIDENTIAL

CL
Oc
on

PUBLISHED BY FCA ITALY S.p.A. - NORMAZIONE

 Page 3
Change 52605/02

1
GENERAL
Fastener property classes covered in this standard are applicable to carbon or alloy screws and nuts
with diameter  39 mm when special properties such as weldability or surface hardness higherthan
core hardness are required.
High strength screws and nuts for heavy-duty application are excluded.

5C
Mechanical properties are applicable at ambient temperature, while for a correct use of screws or nuts
of the various strength classes at temperatures different from ambient temperature, between +300°C

86
and –50°C, changes occurring in mechanical properties in relation to temperature for each property

m F7 6
class shall be taken into account, especially as regards toughness at –20°C to –50°C.

– – For property classes of fasteners for Standard and severe applications see Std. MS.50076

.co d:
and MS.50077.

up ri
.– For corrosion resistant fasteners see Std. 52605/07.

ro se
– For low temperature, corrosion or heat resistant and/or thread diameter > 39 mm screws and

ag - u
nuts, material and characteristics shall be specified on drawing.
fc 1)
o@ C+
an UT

RM
nz (
re PM

NO
flo 6
o. :4

THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY
rd 08

FCA ITALY S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS

IF THE ITALIAN EDITION IS NOT AVAILABLE OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.
R
na 19
leo0, 20

TE

NOT AVAILABLE OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.
r1

US
be
to

CONFIDENTIAL
CL
Oc
on

PUBLISHED BY FCA ITALY S.p.A. - NORMAZIONE

 Page 4
52605/02 Change
.
2
PROPERTY CLASSES

Mechanical properties in the as

supplied conditions
Property
Property A
R Rs min. Hardness classes of
class Application

5C
min. screws to be
on entire screws mated

86
2 2
core Surface
N/mm N/mm %

m F7 6
R40 RCT Parts to be cold- 330 to 410 195 30 HRB 61 to 67 –
riveted.
E.g.: Rivets,

.co d:
R50 RCT 410 to 590 245 25 HRB 67 to 85 –
threaded hexag.

up ri
rivets

ro se
Not very important
parts requiring

ag - u
surface with
hardness greater HV 0.3
R40 IND HV
 490 –  450 –
fc 1) (295)
than core. 150 to 390
o@ C+

E.g.: tapping screws

and serrated flange
an UT

hexagon nuts.
RM
Medium–stressed
nz (

parts requiring
re PM

surface with
hardness greater HV HV 0.3
R50 IND  690 (490) – –
 560
NO

than core. E.g.: Set 215 to 420

flo 6

screws, link joints

o. :4

and self-drilling
FCA ITALY S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT
THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY

tapping screws.
rd 08
IF THE ITALIAN EDITION IS NOT AVAILABLE OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

Hv
HV 0.3
R
na 19

Hexagon screws 260 to 336

R80 IND  790 – –  450 –
with serrated flange. HRC
leo0, 20

24 to 34
TE
AVAILABLE OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

Projection welded
R40 SD  390 (295) – HRB  65 5.8
nuts
r1

HRB  89
US

R50 SD Arc welded nuts  650 (450) – 8.8

HRC  20
be

8.8
HV 190 to 320
to

Projection welded R8
CONFIDENTIAL

8 SD  650 (450) – HRB  89

CL

nuts 8R
HRC  32
Oc

Screws to be
R50 SD
on

welded, projection  390 (245) – HRB  68 –

STAB
welded
Screws to be
640 12 –
projection welded
R80 SD 800 to HV 255 to 320
1000 HRC 23 to 32 10.9
Nuts to be projection
(640) – R10
welded
10R
For notes see Page 6

PUBLISHED BY FCA ITALY S.p.A. - NORMAZIONE

 Page 5
Change 52605/02
3
CORRELATIONS BETWEEN PROPERTY CLASSES AND APPROVED MATERIALS

Property Production Approved materials

Notes
classes method Code () Std.
FE 360 C
52891
Machining FE 360 D
R40 RCT C 10 52405

5C
CB4FU KD Stress relieving to be carried out
Cold heading 52610 after part forming at temperature

86
CB4FF KD
suitable to prevent grain growth.
FE 430 C
52891 For production by machining,

m F7 6
Machining FE 430 D
materials for cold and hot heading,
C 10 52405 of the same class, can also be used.
R50 RCT
Hot heading FE44C KB 52610

.co d:
CB15FF KD
Cold heading 52610

up ri
CQ15FF KD

ro se
C 10 52405
Machining 9 SMNPB 28

ag - u
52606 Hardening shall preferably be
R40 IND () 10SPB 20
obtained by carbonitriding.
CB4FF KD
Cold heading
fc 1) 52610
CB10FF KD
o@ C+

C 15 52403
Machining 12 NC 3 52409 –
an UT

RM
15 Cr 3 52431
R50 IND
CQ15FF KD Hardening shall preferably be
nz (

52610
Cold heading CB20FF KD obtained by carbonitriding.
re PM

12 NC 3 52409 –
NO

CB20FF KD 52610 Hardening of hexagon serrated

flo 6

15 Cr 3 52431 flange screws shall be obtained

o. :4

15 CND 3 52419/01 through carbonitriding with effective

R80 IND Cold heading

THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY
thickness of
rd 08

FCA ITALY S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS
C16B KD 52611  0.05

IF THE ITALIAN EDITION IS NOT AVAILABLE OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.
C188 KD ()
0.10 mm.
0
R
na 19

12 NC 3 52409
Machining
leo0, 20

TE

NOT AVAILABLE OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.
FE 510 D 52891
R40 SD –
CB4FF KD
Cold heading 52610
CB10FF KD
r1

US

C30 52505
C33 52503
be

R50 SD Machining –
32 Cr 4 52542
to

30 CD 4 52518
CONFIDENTIAL
CL

CB20FF KD 52610
Oc

8 SD Cold heading –
12 NC 3 52409
Machining 12 NC 3 52409
on

R50 SD CB4FF KD –
STAB Cold heading CB10FF KD 52610
CB20FF KD
C22B KD
Cold heading 52611 –
R80 SD 22MN4B KD
Machining 28 Mn 6/8.8 53612
For notes see Page 6

PUBLISHED BY FCA ITALY S.p.A. - NORMAZIONE

 Page 6
52605/02 Change
.

NOTES

For designations of classes see Std. 01307 – ( ) Indicative values.

Requirements for screws and nuts to be welded are mandatory also after welding.

The threaded hexagonal rivets shall comply with the provisions of class 8 relating to test load

5C
resistance as per Procurement Spec. 9.52605/01.

86
Serrated flange hexagon nuts shall meet the requirements of PS. 9.52605/01 relating to test load
2
resistance with yield strength Rcp of 820 N/mm . For these nuts, a minimum core hardness

m F7 6
= HV 114 is allowed.

Standard inspection is carried out by checking that parts are file hard (see Std. 50140).

.co d:
up ri
Nuts shall meet the requirements of P.S. 9.52605/01 relating to test load resistance with yield

ro se
2 2
strength Rcp of 780 N/mm for regular height nuts and 1000 N/mm for high nuts (Std. 10143/02).

ag - u
High nuts (Std. Sh. 10143/02) can be mated with screws with property class 10.9, R10 and 10R.
fc 1)
Any stabilizing treatment shall eliminate work-hardening due to upsetting or drawing, which might
2
cause embrittlement during welding or brazing, but without reducing strength to < 390 N/mm . To
o@ C+

check for work hardening, screws shall be subjected to head bend test, as per PS. 9.52605/01
after heating to 600°C approx.
an UT

RM
Screws shall be quenched and tempered. Total plus partial decarburization shall be  1/13 h3 on
nz (

thread crest and  1/13 h3 on thread root.

re PM

(h3 = normal total thread height as per Stds. 01506 and 01507).
NO
flo 6

() For production method with machining, the corresponding lead-content steels quoted in the
o. :4

applicable Standards are allowed.

FCA ITALY S.P.A. IN CASE OF DISPUTE THE ONLY VALID REFERENCE IS THE ITALIAN EDITION. IF THE ITALIAN EDITION IS NOT
THIS DOCUMENT MUST NOT BE REPRODUCED OR CIRCULATED TO THIRD PARTIES WITHOUT PRIOR WRITTEN CONSENT BY

rd 08

() Serrated flange hexagon nuts shall be madeofCB4FFKDand hardening obtained through
IF THE ITALIAN EDITION IS NOT AVAILABLE OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

carbonitriding shall have an effective thickness of

R
na 19

 0.05
0.10 mm.
0
leo0, 20

TE
AVAILABLE OR NOT UPDATED, THE ENGLISH EDITION IS THE VALID REFERENCE.

() Steel C18B KD has a chemical composition equal to that of C16B KD except for carbon whose
limits are: 0.15 to 0.21%.
r1

US
be
to
CONFIDENTIAL

CL
Oc
on

PUBLISHED BY FCA ITALY S.p.A. - NORMAZIONE