GOST 11652-80 Self-Tapping Screws with Countersunk Head and Sharp Point

Self-tapping screws with countersunk head and sharp point for metal and plastic

GOST 11652-80*

Self-tapping screws with countersunk head and sharp point for metal and plastic. Construction and dimensions. Self-tapping countersunk head and sharpening end screws for metals and plastics. Construction and dimensions	GOST 11652-80* Supersedes GOST 10619-63, GOST 11652-65, in terms of screws with sharp point

Effective date — 01.01.82.

1. This standard applies to self-tapping screws with countersunk head and sharp point for metal and plastic, product grade B, with nominal thread diameter from 2.5 to 8 mm.

2. Construction and dimensions of screws — per drawing and Tables 1, 2.

Type 1

Type 2

*Reference dimension.

Table 1

Dimensions in mm

Nominal thread diameter d		2.5	3	4	5	6	8
Thread pitch P		1.25		1.75	2.0	2.5	3.5
Head diameter D	Nom.	4.7	5.6	7.4	9.2	11.0	14.5
	Tolerance per h14	-0.30		-0.36		-0.43
Head height, k, max		1.50	1.65	2.20	2.50	3.00	4.00
Slot width n	Nom.	0.6	0.8	1.0	1.2	1.6	2.0
	Min	0.66	0.86	1.06	1.26	1.66	2.06
	Max	0.80	1.00	1.20	1.51	1.91	2.31
Slot depth t	Min	0.5	0.6	0.8	1.0	1.2	1.6
	Max	0.73	0.85	1.10	1.35	1.60	2.10
Runout tolerance in a specified direction (2IT14)		0.60		0.72		0.86
Tolerance of slot symmetry relative to the shank, diametral (2IT14)		0.50		0.60			0.72
Cross recess number		1		2		3
Cross recess diameter m, max		2.6	2.8	4.0	4.5	6.5	7.4
Cross recess depth h		1.05	1.25	1.55	2.05	2.45	3.40
Gauge penetration depth into cross recess	Max	1.2	1.4	1.8	2.3	3.0	3.9
	Min	0.9	1.1	1.3	1.8	2.5	3.4
Thread run-out, max		0.8			1.0

Note. Cross recess — per GOST 10753-80.

Table 2

mm

Screw length l		Nominal thread diameter d
Nom.	Tolerance per js17	2.5	3	4	5	6	8
6	± 0.75			-	-	-	-
8					-	-	-
10						-	-
12	± 0.90						-
14							-
16
(18)				Standard lengths
20	± 1.05	-
(22)		-	-
25		-	-
30		-	-
35	± 1.25	-	-
40		-	-	-
45		-	-	-
50		-	-	-	-

Note. Lengths l shown in brackets are not recommended for use.

Designation example:

screw of design 1, diameter 5 mm, length 30 mm, material group 01, plain, coarse thread pitch:

Screw 5×30.01 GOST 11652-80

Same, design 2, diameter 5 mm, coarse thread pitch, length 30 mm, material group 01, with zinc coating 6 µm thick, chromated:

Screw 2-5×1.5×30.01.016 GOST 11652-80

3. Technical requirements, thread, test methods, acceptance rules, packaging and marking — per GOST 10618-80.

4. The theoretical mass of the screws is given in Reference Appendix 1.

APPENDIX 1

For reference

Theoretical mass of self-tapping screws

Screw length l, mm	Nominal thread diameter d, mm
	2.5	3	4	5	6	8
	Weight of 1000 pcs. steel screws, kg ≈
6	0.20	0.30	-	-	-	-
8	0.26	0.38	0.72	-	-	-
10	0.32	0.46	0.86	1.34	-	-
12	0.37	0.54	1.00	1.56	2.48	-
14	0.43	0.62	1.14	1.78	2.81	-
16	0.49	0.70	1.28	2.00	3.14	4.21
18	0.54	0.78	1.42	2.22	3.47	4.78
20	-	0.86	1.56	2.44	3.80	5.35
22	-	-	1.70	2.66	4.13	5.92
25	-	-	1.91	2.99	4.62	6.77
30	-	-	2.19	3.54	5.43	8.19
35	-	-	2.47	4.09	6.24	9.61
40	-	-	-	4.64	7.05	11.03
45	-	-	-	5.19	7.86	12.45
50	-	-	-	-	8.67	13.87

Conforms to DIN 7982, ISO 7050.