GOST 1144-80 Half-Round Head Wood Screws

HALF-ROUND HEAD WOOD SCREWS

CONSTRUCTION AND DIMENSIONS

GOST 1144-80

(ST SEV 2329-80)

State Standard of the Union of Soviet Socialist Republics

HALF-ROUND HEAD WOOD SCREWS Construction and dimensions Half - round head wood screws. Construction and dimensions	GOST 1144-80 (ST SEV 2329-80)

Effective date 1982-01-01

1. This standard applies to half-round head wood screws with a shank diameter from 1.6 to 10 mm.

This standard fully complies with ST SEV 2329.

The requirements of this standard are mandatory.

(Revised edition, Amendments No. 1, 2).

2. The construction and dimensions of the screws shall conform to those shown in the drawing and in Tables 1 and 2.

---

*Dimensions for reference.

Table 1

mm

Thread diameter d (tolerance h₁₄)		1.6	2	2.5	3	3.5	4	5	6	8	10
Minor thread diameter d₂, max		1.1	1.4	1.7	2.1	2.4	2.8	3.5	4.2	5.6	7.0
Thread pitch P (tolerance ± 0.2P)		0.8	1	1.25	1.25	1.5	1.75	2	2.5	3.5	4.5
Head diameter D		3.2	4.0	5.0	6.0	7.0	8.0	10.0	12.0	16.0	20.0
Head height K		1.1	1.4	1.7	2.1	2.4	2.8	3.5	4.2	5.6	7.0
Spherical radius	R₁≈	2.6	3.2	4.0	4.8	5.6	6.4	8.0	9.6	12.8	16.0
	R₂≈	1.3	1.6	2.0	2.4	2.8	3.2	4.0	4.8	6.4	8.0
Cross recess number		-	0	1		2			3		4
Cross recess diameter m		-	2	2.6	3.0	4.1	4.6	5.2	7.0	8.2	10.6
Cross recess depth h, max		-	1.2	1.3	1.7	1.8	2.2	2.8	3.2	4.6	5.6
Depth of gauge engagement in the cross recess.	max	-	1.3	1.4	1.8	2.2	2.5	3.1	3.7	5.1	6.3
	min	-	1.0	1.1	1.5	1.7	2.0	2.6	3.2	4.6	5.8

Table 2

mm

Screw length l	Screw diameter d
	1.6	2	2.5	3	3.5	4	5	6	8	10
7				-	-	-	-	-	-	-
10						-	-	-	-	-
13								-	-	-
16	-							-	-	-
(18)	-	-							-	-
20	-	-	Standard lengths						-	-
(22)	-	-							-	-
25	-	-							-	-
30	-	-	-						-	-
35	-	-	-	-					-	-
40	-	-	-	-					-	-
45	-	-	-	-	-				-	-
50	-	-	-	-	-					-
60	-	-	-	-	-					-
70	-	-	-	-	-	-				-
80	-	-	-	-	-	-	-
90	-	-	-	-	-	-	-
100	-	-	-	-	-	-	-

Note. Screw lengths given in parentheses are not recommended for use.

Example of a designation for a type 1 screw, diameter d=3 mm, length l=20 mm, made of low-carbon steel, plain (uncoated):

Screw 1 - 3×20 GOST 1144-80

Same, with a 6 µm zinc coating applied by cathodic reduction, chromated:

Screw 1 - 3×20.016 GOST 1144-80

Same, type 2, made of corrosion-resistant steel, plain (uncoated):

Screw 2 - 3×20.2 GOST 1144-80

(Revised edition, Amendment No. 2).

3. Slot recesses - per GOST 24669, cross recesses - per GOST 10753.

(Revised edition, Amendment No. 2).

3a. The diameter of the plain shank section d₁ shall be not less than the diameter for thread rolling, or shall not exceed the nominal value of the screw’s major thread diameter.

3b. The radius under the head - per GOST 24670.

3a, 3b. (Added, Amendment No. 2).

4. Technical requirements - per GOST 1147.

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

6. Where interchangeability is required for use in products designed before 1 January 1980, screws may be manufactured, by agreement with the customer, with tolerances per Appendix 2.

APPENDIX 1

For reference

Mass of steel screws

Screw length l, mm	Theoretical mass of 1000 pcs of steel screws, kg ≈ at nominal thread diameter d, mm
	1.6	2	2.5	3	3.5	4	5	6	8	10
7	0.13	0.20	0.33	-	-	-	-	-	-	-
10	0.16	0.26	0.42	0.64	0.89	-	-	-	-	-
13	0.20	0.32	0.51	0.77	1.07	1.44	2.40	-	-	-
16	-	0.38	0.60	0.90	1.25	1.67	2.76	-	-	-
18	-	-	0.66	0.99	1.36	1.83	3.00	4.53	-	-
20	-	-	0.71	1.08	1.48	1.98	3.24	4.88	-	-
22	-	-	0.77	1.16	1.60	2.14	3.49	5.22	-	-
25	-	-	0.86	1.30	1.78	2.36	3.85	5.74	-	-
30	-	-	-	1.52	1.07	2.75	4.45	6.61	-	-
35	-	-	-	-	2.36	3.14	5.06	7.47	-	-
40	-	-	-	-	2.66	3.52	5.67	8.34	-	-
45	-	-	-	-	-	3.91	6.27	9.20	-	-
50	-	-	-	-	-	4.29	6.88	10.07	18.47	-
60	-	-	-	-	-	5.06	8.09	11.80	21.52	-
70	-	-	-	-	-	-	9.30	13.53	24.57	-
80	-	-	-	-	-	-	-	15.26	27.63	44.39
90	-	-	-	-	-	-	-	16.99	30.68	49.14
100	-	-	-	-	-	-	-	18.72	33.73	53.89

Note. To determine the mass of brass screws, multiply the masses given in the table by a factor of 1.08.

APPENDIX 2

For reference

TOLERANCES FOR HALF-ROUND HEAD WOOD SCREWS UNDER THE ESDP SEV AND OST SYSTEM

Tolerance zones
per ESDP SEV	per OST system
h14	B₇
js15	CM₈
js17	CM₁₀

INFORMATIONAL DATA

1. DEVELOPED AND SUBMITTED BY the Ministry of Ferrous Metallurgy of the USSR

DEVELOPERS

V. G. Vilde, R. V. Zhirova, T. M. Khlopunova, T. E. Yurchenko

2. APPROVED AND PUT INTO EFFECT by Decree of the USSR State Committee for Standards dated 30.06.80 No. 3274

3. This standard fully complies with ST SEV 2329-80

4. SUPERSEDES GOST 1144-70

5. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS

Designation of the referenced regulatory document	Clause number
GOST 1147-80	4
GOST 10753-86	3
GOST 24669-81	3
GOST 24670-81	3b
ST SEV 2329-80	1

6. Reviewed in 1990. By Gosstandart Decree No. 406 of 29.03.91, the validity period restriction was lifted.

7. REISSUE (October 1997) with Amendments No. 1, 2, approved in December 1981 and March 1991 (IUS 3-82, 6-91)

Complies with DIN 96, DIN 7981.