GOST 17474 - 1980 Raised countersunk head screws (Cross Recessed), product grades A and B

Unit: 毫米(mm)

Thread Size
d

2.5

P	pitch	Coarse thread
		Fine thread
d_k
k	max
f	≈
R	≈
Socket No.
m
t	max
Penetration depth	max
	min
b	Lengthened
	normal

0.4	0.45	0.5
/	/	/
3.8	4.7	5.6
1.2	1.5	1.65
0.5	0.6	0.75
4.2	5.4	6
0	1	1
2.3	3	3.3
1.5	1.6	2
1.6	1.9	2.2
1.3	1.6	1.9
16	18	19
10	11	12

per 1000 units ≈ kg(7.85kg/cm3)

①,r ≤ 0.1d。
①,Coarse thread
②,Plain part diameter ds shall be equal to major thread diameter or shall be equal to diameter of body for metric thread rolling in accordance with GOST 19256-73.

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