GOST 17473 - 1980 Half-rounded head screws, product grades A and B

Unit: 毫米(mm)

Thread Size
d

1.2

1.4

P	pitch	Coarse thread
		Fine thread
D
k
R₁	≈
Socket No.
m
t	max
Penetration depth	groove depth	max
		min
b	Lengthening
	standard

0.25	0.25	0.3
/	/	/
2	2.3	2.6
0.7	0.8	0.95
1.1	1.3	1.4
/	/	/
/	/	/
/	/	/
/	/	/
/	/	/
/	/	/
8	9	9

per 1000 units ≈ kg(7.85kg/cm3)

①,It is allowed to produce screws with the lengths not specified in Table 2 by agreement between the customer and the manufacturer.
②,Thread shall be in accordance with GOST 24705-81. Thread runout and undercut shall be in accordance with GOST 10549-80.
③,Straight slots shall be in accordance with GOST 24669-81; Phillips slots shall be in accordance with GOST 10753-80.
④,Under-head radius shall be in accordance with GOST 24670-81.
⑤,Tolerances, methods of monitoring the dimensions and deviations of surfaces form and arrangement shall be in accordance with GOST 1759.1-82.
⑥,Surface defects and monitoring methods shall be in accordance with GOST 1759.2-82.
⑦,Technical requirements shall be in accordance with GOST 1759-70.