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FIAT 9-52605-01

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W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

T H E O N L Y V A L I D R E F E R E N C E I S T H E O R I G I N A L I T A L I A N E D I T I O N

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T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

T H E O N L Y V A L I D R E F E R E N C E I S T H E O R I G I N A L I T A L I A N E D I T I O N

GENERAL

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T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E T H E O N L Y

T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

T H E O N L Y V A L I D R E F E R E N C E I S T H E O R I G I N A L I T A L I A N E D I T I O N

3.6

Surface protective coatings

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T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

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9.52605/01

N Some examples of quench–and–harden cracks are shown in Figure 1 for screws and in Figure 2for

nuts.

Figure 1

Circumferential

quench–and–

harden crack

adjacent

to the radius fillet

Quench–and–

harden crack

on the edge of

the head Crosswise

quench–and–

harden crack

Quench–and–har-

den crack

on thread bottom

Quench–and–har-

den crack

on the crest of the

incomplete thread

Quench–and–harden crack across the

top of the head, generally

extending along shank

or one of the head flats

Quench–and–har-

den crack

crosswise to the

bearing face

with collar

Lengthwise

quench–and–

harden crack

Quench–and–

harden crack

extending

radially

into the radius

fillet

Quench–and–harden

crack

at bottom of the flute

Quench-and-harden crack

Sect. A–A

(A)

Figure 2

Quench–and–har-

den crack

on the threads

Quench-and-harden crack

Quench-and-harden

crack

No quench–and–harden cracks of any size and in any location are allowed on the screw or nut.

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T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

Figure 3

Stamping cracks on top face of head

Figure 4

Inclusion cracks on bearing surfaces or on threading

Stamping cracks on bearing surfaces

In the case of screws, cracks may not have lengths greater than the screw nominal diameter d and width or depth greater than 0.2 to 0.01 d (in mm), when located on head top face. Instead, when they are located on the head swollen edges the cracks allowed may be less wide than 0.25 + 0.02 d (in mm) and depth less than edge height.

In the case of nuts, cracks are allowed when the nut passes the expansion test (see to

T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

T H E O N L Y V A L I D R E F E R E N C E I S T H E O R I G I N A L I T A L I A N E D I T I O N

3.1

4.2.2

Hex socket head screws Figure a)

Not allowed: joins the head outer surface and the socket.

Figures b) c)

Figure d)

Allowed

Irregularities that may intersect not allowed.

Allowed but

only if lengthwise.

Allowed

Allowed, but not in the area mating

with the wrench (socket bot-tom)

Not allowed

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T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E T H E O N L Y

Figure 5Figure 6

Flakes caused by stamping

T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

T H E O N L Y V A L I D R E F E R E N C E I S T H E O R I G I N A L I T A L I A N E D I T I O N

Some examples of scoring are shown in Figure 7 for the screws and in Figure 8 for the nuts.

Figure 8

Figure 7

Line mark, normally straight or slightly curved,extending lengthwise.

Tool marks

Marks left by the tool as a result of

a deburring operation

Tool marks Scoring marks on the shank and head of the screws not exceeding the dimensions indicated in DIAMETER

SCORING SIZE

THREADING DIAMETER Max width (mm)

0.130.10 + 0.015 d 0.250.10 + 0.015 d

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T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

Figure 9

Figure 10

Pitting Pitting

Pittings on the screw head bearing area or on nut side face bearing area caused by lack of material filling are allowed if their depth does not exceed 0.25 mm and their total area does not exceed 5 %of the actual bearing face surface. Pittings on the other surfaces are allowed provided their depth does not exceed 0.25 mm, threading excepted.3.14.6

Dents and incisions

Figure 11Figure 12

Dents on threads are allowed provided it is possible to screw on the threaded ring or plug GO gage,by applying a maximum torque, expressed in N mm, equivalent to 0.01 F m d, for the screws and to 0.01 R d S r D for the nuts.where:

F m is the minimum UTS fromTables 6.d is the nominal diameter of the screw in mm.R d

is the unit inspection load indicated in Table 3.

T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

T H E O N L Y V A L I D R E F E R E N C E I S T H E O R I G I N A L I T A L I A N E D I T I O N

TABLE 3

STRENGTH CLASS

Figure 13

Folds allowed

on external radius fillet

Folds allowed

on external radius fillet

Folds allowed

on internal radius fillet

Folds allowed

on internal radius fillet

Fold allowed on the point

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9.52605/01

C O N F I

E N T I A L

T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

T H E O N L Y V A L I D R E F E R E N C E I S T H E O R I G I N A L I T A L I A N E D I T I O N

Figure 14

* H = Height of the fundamental triangle in maximum material condition

Folds

not allowed

Folds allowed

form irregularity allowed on the crest

Direction of pressure on the thread

Outside diameter Pitch diameter Minor diameter Outside diameter Pitch diameter Minor diameter Outside diameter Pitch diameter Minor diameter

Figure 15

Fold on

bearing face plane

Fold on one

face of the hexagon

Fold on the edge of flanged nuts

Folds

No folds of any length and depth are allowed on screw threads when:–they start at thread root;

–they start on thread flank and are turned towards minor diameter and extending under the pitch diameter;

–

they start on thread flank below pitch diameter and turned towards the outside diameter on the flank under pressure.

T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

T H E O N L Y V A L I D R E F E R E N C E I S T H E O R I G I N A L I T A L I A N E D I T I O N

On the screw threads folds are allowed when:–they start on the crest or flank, towards the pitch diameter;

C O N F I

E N T I A L

T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

Figure 17

Figure 18

TEST PROGRAMS Screws TABLE 4

TEST PROGRAM

TEST (A)

CHARACTERI-STRENGTH CLASS

STIC

PROCEDURE

R40 RCT R50 RCT

5.8

8.810.912.9

4.814H

R40 RCT R50 RCT

R40 IND R50 IND R80 IND

R50SD STAB

5.8

8.810.912.9R80SD

Tensile test on specimen §5.1.1F F F

tensile stress

Tensile §

T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

T H E O N L Y V A L I D R E F E R E N C E I S T H E O R I G I N A L I T A L I A N E D I T I O N

(continued

C O N F I

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T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

Figure 19

T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

T H E O N L Y V A L I D R E F E R E N C E I S T H E O R I G I N A L I T A L I A N E D I T I O N

d is th

e nominal thread diameter

d o is th

e specimen diameter (tol. j Figure 20

according to UNI ISO 273, medium

series

d h Load

For studs, the head shall consist of a nut or similar suitable item screwed down to the bottom of the finer pitch threaded shank. Should stud threading be the same at either end, the head substituting item shall be screwed down to the bottom of the threading at root end (see Std.

C O N F I

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T H I S D O C U M E N T M U S T N O T B E R E P R O D U C E D O R C I R C U L A T E D T O T H I R D P A R T I E S

W I T H O U T P R I O R W R I T T E N C O N S E N T B Y F I A T A U T O S .P .A . I N C A S E O F D I S P U T E

FIAT 9-52605-01

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