GOST 17475-80 Countersunk Head Screws, Product Grades A and B. Construction and Dimensions

GOST 17475-80 applies to countersunk head screws of product grades A and B with a nominal thread diameter from 1 to 20 mm. The standard fully complies with ST SEV 2652-80.

The design and dimensions of screws shall conform to those specified in Tables 1, 2 and the drawing.

Table 1

mm

COUNTERSUNK HEAD SCREWS, PRODUCT GRADES A AND B Construction and dimensions Countersunk head screws product grades A and B. Construction and dimensions	GOST 17475-80* (ST SEV 2652-80) Supersedes GOST 17475-72

Table 2

mm

Nominal thread diameter d		1	1.2	1.4	1.6	2	2.5	3	3.5	4	5	6	8	10	12	14	16	18	20
Thread pitch P	coarse	0.25	0.25	0.3	0.35	0.4	0.45	0.5	0.6	0.7	0.8	1	1.25	1.5	1.75	2	2	2.5	2.5
	fine	-	-	-	-	-	-	-	-	-	-	-	1	1.25	1.25	1.5	1.5	1.5	1.5
Head diameter D		1.9	2.3	2.6	3.0	3.8	4.7	5.6	6.5	7.4	9.2	11.0	14.5	18.0	21.5	25	28.5	32.5	36.0
Head height r, max		0.6	0.72	0.84	0.96	1.2	1.5	1.65	1.93	2.2	2.5	3	4	5	6	7	8	9	10
Cross recess number		-	-	-	-	0	1		2			3		4		-	-	-	-
Cross recess diameter t		-	-	-	-	2	2.7	2.8	4.0	4.3	4.6	6.5	7.5	9.7	10.7	-	-	-	-
Cross recess depth h, max		-	-	-	-	1.1	1.4	1.5	1.7	2.0	2.3	2.7	3.7	4.6	5.6	-	-	-	-
Gauge penetration depth into cross recess	max	-	-	-	-	1.2	1.55	1.7	2.0	2.3	2.6	3.3	4.3	5.4	6.4	-	-	-	-
	min	-	-	-	-	0.9	1.25	1.4	1.5	1.8	2.1	2.8	3.8	4.9	5.9	-	-	-	-
Thread length b	extended	-	-	-	-	16	18	19	20	22	25	28	34	40	46	52	58	64	70
	normal	8	9	9	9	10	11	12	13	14	16	18	22	26	30	34	38	42	46

Continuation of Table 2

mm

Screw lengthl	Nominal thread diameter d
	1	1.2	1.4	1.6	2	2.5	3	3.5	4
2			-	-	-	-	-	-	-
3						-	-	-	-
(3.5)								-	-
4								-	-
5
6
(7)				Standard lengths
8
9
10
11	-
12	-
(13)	-	-	-
14	-	-	-
16	-	-	-
(18)	-	-	-	-
20	-	-	-	-
(22)	-	-	-	-	-
25	-	-	-	-	-
(28)	-	-	-	-	-	-
30	-	-	-	-	-	-
(32)	-	-	-	-	-	-	-
35	-	-	-	-	-	-	-
(38)	-	-	-	-	-	-	-	-
40	-	-	-	-	-	-	-	-
(42)	-	-	-	-	-	-	-	-	-
45	-	-	-	-	-	-	-	-	-
(48)	-	-	-	-	-	-	-	-	-
50	-	-	-	-	-	-	-	-	-
55	-	-	-	-	-	-	-	-	-
60	-	-	-	-	-	-	-	-	-
65	-	-	-	-	-	-	-	-	-
70	-	-	-	-	-	-	-	-	-
75	-	-	-	-	-	-	-	-	-
80	-	-	-	-	-	-	-	-	-
(85)	-	-	-	-	-	-	-	-	-
90	-	-	-	-	-	-	-	-	-
(95)	-	-	-	-	-	-	-	-	-
100	-	-	-	-	-	-	-	-	-
110	-	-	-	-	-	-	-	-	-
120	-	-	-	-	-	-	-	-	-

mm

Screw lengthl	Nominal thread diameter d
	5	6	8	10	12	14	16	18	20
2	-	-	-	-	-	-	-	-	-
3	-	-	-	-	-	-	-	-	-
(3.5)	-	-	-	-	-	-	-	-	-
4	-	-	-	-	-	-	-	-	-
5	-	-	-	-	-	-	-	-	-
6		-	-	-	-	-	-	-	-
(7)		-	-	-	-	-	-	-	-
8			-	-	-	-	-	-	-
9			-	-	-	-	-	-	-
10				-	-	-	-	-	-
11				-	-	-	-	-	-
12					-	-	-	-	-
(13)					-	-	-	-	-
14					-	-	-	-	-
16						-	-	-	-
(18)						-	-	-	-
20						-	-	-	-
(22)						-	-	-	-
25							-	-	-
(28)							-	-	-
30								-	-
(32)								-	-
35									-
(38)			Standard lengths						-
40
(42)
45
(48)
50
55	-
60	-
65	-	-
70	-	-
75	-	-
80	-	-
(85)	-	-	-
90	-	-	-
(95)	-	-	-
100	-	-	-
110	-	-	-	-	-	-	-	-
120	-	-	-	-	-	-	-	-	-

Notes:

1. Screw lengths given in brackets are not recommended for use.

2. The extended thread length is preferred.

3. Screws with a shank length less than the thread length, including the incomplete thread run-out, shall be manufactured with thread along the entire length of the shank.

*Dimensions for reference.

**For screws machined by cutting; not specified for other cases.

Example of designation for a countersunk head screw, product grade A, type 1, thread diameter d=8 mm, with coarse thread pitch, thread tolerance class 6g, length l=50 mm, normal thread length b=22 mm, property class 4.8, plain (uncoated):

Screw A.M8 - 6g×50.48 GOST 17475-80.

Same, product grade B, type 2, with fine thread pitch, extended thread length b = 34 mm, with zinc coating 6 µm thick, chromated:

Screw B2.M8×1 - 6g×50 - 34.48.016 GOST 17475-80.

The diameter of the plain part d₁ shall be equal to the outer diameter of the thread or equal to the shank diameter for rolling metric thread per GOST 19256-73.

By agreement between the customer and the manufacturer, screws with lengths not specified in Table 2 may be produced.

Thread — per GOST 24705-81. Thread run-out and incomplete thread — per GOST 10549-80.

Slot recesses — per GOST 24669-81, cross recesses — per GOST 10753-86.

Tolerances, methods for inspection of dimensions and deviations in form and position of surfaces — per GOST 1759.1-82.

Surface defects and inspection methods — per GOST 1759.2-82.

Technical requirements — per GOST 1759.0-87.

Theoretical mass of screws is given in Appendix 1.

Appendix 1 (informative). Theoretical mass of screws

Screw length l, mm	Mass of 1000 pcs of steel screws with coarse thread pitch, kg ≈ at nominal thread diameter d, mm
	1	1.2	1.4	1.6	2	2.5	3	3.5	4	5	6	8	10	12	14	16	18	20
2	0.013	0.021		-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
3	0.018	0.028	0.039	0.052	0.091	-	-	-	-	-	-	-	-	-	-	-	-	-
3.5	0.029,	0.031	0.043	0.058	0.100	0.171	0.254	-	-	-	-	-	-	-	-	-	-	-
4	0.022	0.034	0.048	0.063	0.109	0.186	0.276	-	-	-	-	-	-	-	-	-	-	-
5	0.026	0.041	0.057	0.075	0.127	0.215	0.319	0.461	0.624	-	-	-	-	-	-	-	-	-
6	0.031	0.048	0.066	0.086	0.145	0.245	0.362	0.519	0.701	1.147	-	-	-	-	-	-	-	-
7	0.035	0.054	0.075	0.097	0.163	0.274	0.406	0.576	0.777	1.269	-	-	-	-	-	-	-	-
8	0.039	0.061	0.084	0.108	0.181	0.303	0.4-19	0.635	0.854	1.391	2.091	-	-	-	-	-	-	-
9	0.044	0.068	0.093	0.120	0.199	0.333	0.492	0.693	0.930	1.513	2.271	-	-	-	-	-	-	-
10	0.048	0.074	0.102	0.131	0.217	0.362	0.536	0.752	1.007	1.636	2.445	4.770	-	-	-	-	-	-
11	-	0.081	0.111	0.142	0.235	0.391	0.579	0.810	1.083	1.758	2.620	5.085	-	-	-	-	-	-
12	-	0.088	0.120	0.153	0.253	0.421	0.622	0.869	1.159	1.880	2.794	5.400	9.05	-	-	-	-	-
13	-	-	-	0.165	0.271	0.450	0.666	0.927	1.236	2.002	2.969	5.716	9.55	-	-	-	-	-
14	-	-	-	0.176	0.289	0.479	10.709	0.986	1.312	2.124	3.144	6.031	10.05	-	-	-	-	-
16	-	-	-	0.198	0.325	0.538	0.796	1.103	1.465	2.369	3.493	6.662	11.06	16.80	-	-	-	-
18	-	-	-	-	0.361	0.597	0.882	1.220	1.618	2.613	3.842	7.293	12.05	18.97	-	-	-	-
20	-	-	-	-	0.394	0.665	0.969	1.337	1.771	2.857	4.191	7.924	13.05	21.14	-	-	-	-
22	-	-	-	-	-	0.714	1.056	1.454	1.924	3.102	4.541	8.555	14.05	21.14	-	-	-	-
25	-	-	-	-	-	0.802	1.186	1.630	2.153	3.468	5.064	9.501	15.54	23.31	33.17	-	-	-
28	-	-	-	-	-	-	1.315	1.805	2.383	3.835	5.588	10.447	17.04	25.49	36.13	-	-	-
30	-	-	-	-	-	-	1.402	1.922	2.536	4.079	5.938	11.079	18.04	26.93	38.11	51.67	-	-
32	-	-	-	-	-	-	-	2.039	2.689	4.324	6.287	11.709	19.03	28.38	40.09	54.32	-	-
35	-	-	-	-	-	-	-	2.215	2.918	4.690	6.811	12.556	20.53	30.55	43.06	58.30	75.89	-
38	-	-	-	-	-	-	-	-	3.147	5.057	7.335	13.602	22.02	32.72	46.02	62.27	80.83	-
40	-	-	-	-	-	-	-	-	3.300	5.301	7.684	14.233	23.02	34.17	48.00	64.93	84.13	106.9
42	-	-	-	-	-	-	-	-	-	5.546	8.034	14.864	24.02	35.62	49.99	67.58	87.42	111.0
45	-	-	-	-	-	-	-	-	-	5.912	8.557	15.810	25.52	37.79	52.94	71.56	92.36	117.3
48	-	-	-	-	-	-	-	-	-	6.279	9.082	16.756	27.01	39.96	55.91	75.53	97.31	123.5
50	-	-	-	-	-	-	-	-	-	6.523	9.430	17.387	28.01	41.41	57.89	78.19	100.60	127.6
55	-	-	-	-	-	-	-	-	-	-	10.304	18.964	30.50	45.03	62.83	84.82	108.84	138.0
60	-	-	-	-	-	-	-	-	-	-	11.177	20.541	33.00	48.64	67.78	91.45	117.08	148.4
65	-	-	-	-	-	-	-	-	-	-	-	22.118	35.49	52.26	72.72	98.08	125.31	158.8
70	-	-	-	-	-	-	-	-	-	-	-	23.695	37.98	55.88	77.67	104.71	133.55	169.1
75	-	-	-	-	-	-	-	-	-	-	-	25.272	40.47	59.50	82.61	111.34	141.78	179.5
80	-	-	-	-	-	-	-	-	-	-	-	26.849	42.97	63.12	87.56	117.97	150.01	189.9
85	-	-	-	-	-	-	-	-	-	-	-	-	45.46	66.73	92.50	124.60	158.26	200.3
90	-	-	-	-	-	-	-	-	-	-	-	-	47.95	70.35	97.44	131.22	166.49	210.7
95	-	-	-	-	-	-	-	-	-	-	-	-	50.45	73.97	102.39	137.85	174.73	221.0
100	-	-	-	-	-	-	-	-	-	-	-	-	52.94	77.59	107.33	144.49	182.97	231.4
110	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	199.44	252.2
120	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	272.9

Note. To determine the mass of screws made of aluminium alloy, multiply the mass values given in the table by a factor of 0.356; for brass, by 1.08.

Corresponds to DIN 963, DIN 964, DIN 965, ISO 2009, ISO 2010, ISO 7046-1, ISO 7046-2.