GOST 17474-80

Raised countersunk head screws, product grades A and B. This standard applies to screws with a nominal thread diameter from 1 to 20 mm. The standard fully complies with ST SEV 2655-80.

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

RAISED COUNTERSUNK HEAD SCREWS, PRODUCT GRADES A AND B Construction and dimensions Raised countersunk head screws product grades A and B. Construction and dimensions	GOST 17474-80* (ST SEV 2655-80) Supersedes GOST 17474-72

Table 1

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	1.0	1.25	1.5	1.75	2.0	2.0	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
Height of countersunk part of head 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
Height of sphere f≈		0.25	0.3	0.35	0.4	0.5	0.6	0.75	0.9	1	1.25	1.5	2	2.5	3	3.5	4	4.5	5
Radius of sphere K₁≈		2.1	2.6	2.9	3.4	4.2	5.4	6	6.8	8	9.4	12	15	19	22.5	26	30	34	38
Cross recess number		-	-	-	-	0	1		2			3		4		-	-	-	-
Cross recess diameter t		-	-	-	-	2.3	3.0	3.3	4.4	4.8	5.4	7.3	8.7	11.2	12.6	-	-	-	-
Cross recess depth h, max		-	-	-	-	1.5	1.6	2.0	2.2	2.5	3.1	3.5	5.0	6.1	7.5	-	-	-	-
Gauge penetration depth into cross recess	max	-	-	-	-	1.6	1.9	2.2	2.5	2.8	3.4	4.0	5.5	6.8	8.3	-	-	-	-
	min	-	-	-	-	1.3	1.6	1.9	2.0	2.3	2.9	3.5	5.0	6.3	7.8	-	-	-	-
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

Table 2

mm

Screw lengthl	Nominal thread diameter d
	1	1.2	1.4	1.6	2	2.5	3	3.5
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	-	-	-	-	-	-	-	-

Continuation of Table 2

mm

Screw lengthl	Nominal thread diameter d
	4	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 a designation for a raised countersunk head screw, product grade A, design 1, thread diameter d=8mm, coarse pitch thread, tolerance field 6g, length l=50 mm, normal thread length b=22mm, property class 4.8, without coating:

Screw A.M8 - 6g´50.48 GOST 17474-80

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

Screw B2.M8´1 - 6g´50 - 34.48.016 GOST 17474-80

The diameter of the smooth part 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 may be manufactured with lengths not specified in Table 2.

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

Straight slots — per GOST 24669-81; cross recesses — per GOST 10753-86.

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

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

Technical requirements — to 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	15	18	20
2	0.014	0.025	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
3	0.018	0.030	0.042	0.058	0.105	-	-	-	-	-	-	-	-	-	-	-	-	-
3.5	0.021	0.033	0.047	0.064	0 ,114	-	-	-	-	-	-	-	-	-	-	-	-	-
4	0.023	0.036	0.051	0.070	0.123	0.215	0.332	-	-	-	-	-	-	-	-	-	-	-
5	0.027	0.043	0.060	0.081	0.141	0.244	0.375	0.559	0.764	-	-	-	-	-	-	-	-	-
6	0.031	0.050	0.069	0.092	0.160	0.274	0.419	0.617	0.840	1.428	-	-	-	-	-	-	-	-
7	0.035	0.056	0.078	0.103	0.178	0.303	0.462	0.672	0.919	1.550	-	-	-	-	-	-	-	-
8	0.040	0.065	0.087	0.115	0.196	0.332	0.505	0.731	0.995	1.679	2.598	-	-	-	-	-	-	-
9	0.044	0.072	0.096	0.126	0.214	0.362	0.549	0.789	1 ,072	1.801	2.773	-	-	-	-	-	-	-
10	0.048	0.079	0.105	0.137	0.232	0.391	0.592	0.848	1 ,148	1.923	2.947	5.865	-	-	-	-	-	-
11	-	0.085	0.114	0.148	0.250	0.420	0.635	0.907	1 ,224	2.045	3.122	6.180	-	-	-	-	-	-
12	-	0.092	0.123	0.160	0.268	0.449	0.679	0.965	1 ,301	2.167	3.297	6.612	11.15	-	-	-	-	-
13	-	-	-	0.171	0.286	0.479	0.722	1.024	1 ,377	2.290	3.471	6.927	11.65	-	-	-	-	-
14	-	-	-	0.182	0.304	0.508	0.765	1.082	1 ,454	2.412	3.646	7.242	12.15	-	-	-	-	-
16	-	-	-	0.207	0.340	0.567	0.852	1 ,199	1 ,607	2.656	3.995	7.874	13.15	20.38	-	-	-	-
18	-	-	-	-	0.376	0.625	0.939	1 ,316	1 ,760	2.900	4.344	8.504	14.43	21.83	-	-	-	-
20	-	-	-	-	0.416	0.684	1.025	1 ,433	1 ,912	3.145	4.694	9.135	15.42	23.28	-	-	-	-
22	-	-	-	-	-	0.743	1.112	1 , 5 5 0	2.065	3.389	5.043	9.766	16.42	25.26	-	-	-	-
25	-	-	-	-	-	0.831	1.242	1 ,726	2.295	3.756	5.567	10.712	17.92	27.44	39.73	-	-	-
28	-	-	-	-	-	-	1.372	1 ,902	2.524	4.122	6.091	11.658	19.41	29.60	42.69	-	-	-
30	-	-	-	-	-	-	1.459	2.019	2.677	4.367	6.440	12.290	20.41	31.05	44.67	61.46	-	-
32	-	-	-	-	-		-	2.136	2.830	4.611	6.789	12.920	21.41	32.50	46.65	64.11	-	-
35	-	-	-	-	-	-	-	2.311	3.059	4.978	7.313	13.867	22.90	34.67	49.61	68.09	90.24	-
38	-	-	-	-	-	-	-	-	3.287	5.344	7.837	14.813	24.40	36.84	52.58	72.07	95.18	-
40	-	-	-	-	-	-	-	-	3.439	5.589	8.187	15.444	25.40	38.29	54.56	74.72	98.47	126.6
42	-	-	-	-	-	-	-	-	-	5.833	8.535	16.075	26.39	39.74	56.54	77.37	101.77	130.8
45	-	-	-	-	-	-	-	-	-	6.200	9.060	17.021	27.89	41.91	59.51	81.35	106.71	137.0
48	-	-	-	-	-	-	-	-	-	6.560	9.584	17.967	29.39	44.08	62.47	85.33	111.65	143.3
50	-	-	-	-	-	-	-	-	-	6.804	9.933	18.598	30.38	45.53	64.45	87.98	114.95	147.4
55	-	-	-	-	-	-	-	-	-	7.415	10.806	20.175	32.88	49.15	69.39	94.62	123.18	157.8
60	-	-	-	-	-	-	-	-	-	8.026	11.642	21.752	35.37	52.76	74.34	101.24	131.43	168.2
65	-	-	-	-	-	-	-	-	-	8.637	12.515	23.329	37.86	56.38	79.29	107.88	139.66	178.5
70	-	-	-	-	-	-	-	-	-	9.248	13.388	24.791	40.08	60.00	84.22	114.51	147.90	188.9
75	-	-	-	-	-	-	-	-	-	9.859	14.261	26.368	42.57	63.62	89.18	121.13	156.13	199.3
80	-	-	-	-	-	-	-	-	-	10.470	15.134	27.945	45.06	67.24	94.12	127.77	164.36	209.7
85	-	-	-	-	-	-	-	-	-	11.081	16.007	29.522	47.56	70.85	99.07	134.39	172.61	220.0
90	-	-	-	-	-	-	-	-	-	11.691	16.881	31.099	50.05	73.94	104.01	141.03	180.84	230.4
95	-	-	-	-	-	-	-	-	-	12.302	17.754	32.677	52.54	77.56	108.22	147.65	189.08	240.8
100	-	-	-	-	-	-	-	-	-	12.913	1.627	34.252	55.03	81.17	113.17	154.27	197.32	251.2
110	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	213.79	271.9
120	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	292.7

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

Corresponds to DIN 964, DIN 966, ISO 2010, ISO 7047.