GOST 12414-94 Ends of Bolts, Screws and Studs. Dimensions

INTERSTATE STANDARD

ENDS OF BOLTS, SCREWS AND STUDS	GOST 12414-94 (ISO 4753-83)
Sizes
Ends of bolts, screws and studs. Sizes

Date of introduction 1996-01-01

Foreword

1 DEVELOPED by the All-Russian Scientific Research Institute for Standardization and Certification in Mechanical Engineering of Gosstandart of Russia

SUBMITTED by Gosstandart of Russia

2 ADOPTED by the Interstate Council for Standardization, Metrology and Certification (Minutes No. 6 of 21 October 1994)

The following voted in favor of adoption:

Name of state	Name of national standardization body
Republic of Azerbaijan	Azgosstandart
Republic of Armenia	Armgosstandart
Republic of Belarus	Belstandart
Republic of Georgia	Gruzstandart
Republic of Kazakhstan	Gosstandart of the Republic of Kazakhstan
Kyrgyz Republic	Kyrgyzstandart
Republic of Moldova	Moldovastandart
Russian Federation	Gosstandart of Russia
Republic of Uzbekistan	Uzgosstandart
Ukraine	Gosstandart of Ukraine

This standard is the complete authentic text of ISO 4753-83 “Fasteners — Ends of fasteners with ISO metric external thread”, with the exception of two types of stepped ends (with a cone and with a sphere) additionally introduced for the needs of the country’s economy.

3 By Resolution No. 492 of the Committee of the Russian Federation for Standardization, Metrology and Certification of 28 September 1995, the interstate standard GOST 12414-94 (ISO 4753-83) was put into effect as a state standard of the Russian Federation from 1 January 1996.

4 SUPERSEDES GOST 12414-66

5 REISSUE

1 Scope

This standard establishes the shapes and dimensions of the ends of bolts, screws and studs with metric thread diameter from 1 to 52 mm.

2 Dimensions

The shapes and dimensions of the ends shall correspond to those shown in the figures and in Table 1.

• 120°±2° for short-length screws.

Notes

1 u = 2P — partial thread section.

2 The largest diameter of the end face of the shank D shall be smaller than the minor diameter of the thread.

3 The 48° angle applies only to the part of the end smaller than the minor diameter of the thread.

4 The fillet radius R is approximately 0.03–0.1d.

5 Another shape of the chip groove is permitted.

Table 1

d	dph14	d*th16	dzh14	dkh14	z₁+ IT 14	z₂+ IT 14	z₃≈
1	0.5	0.10	-	-	0.20	-	0.1
1.2	0.6	0.12	-	-	0.30	-	0.2
1.4	0.7	0.14	0.7	-	0.35	0.70	0.2
1.6	0.8	0.16	0.8	-	0.40	0.80	0.2
1.8	0.9	0.18	0.9	-	0.45	0.90	-
2	1.0	0.20	1.0	0.2	0.50	1.00	0.3
2.2	1.2	0.22	1.1	-	0.55	1.10	-
2.5	1.5	0.25	1.2	0.3	0.63	1.25	0.4
3	2.0	0.30	1.4	0.4	0.75	1.50	0.4
3.5	2.2	0.35	1.7	0.4	0.88	1.75	0.4
4	2.5	0.40	2.0	0.5	1.00	2.00	0.5
4.5	3.0	0.45	2.2	-	1.12	2.25	-
5	3.5	0.50	2.5	0.5	1.25	2.50	0.6
6	4.0	1.50	3.0	0.5	1.50	3.00	0.7
7	5.0	2.00	4.0	0.5	1.75	3.50	0.8
8	5.5	2.00	5.0	0.5	2.00	4.00	1.0
10	7.0	2.50	6.0	1.0	2.50	5.00	1.0
12	8.5	3.00	7.0	1.0	3.00	6.00	1.2
14	10.0	4.00	8.5	2.0	3.50	7.00	1.5
16	12.0	4.00	10.0	3.0	4.00	8.00	1.7
18	13.0	5.00	11.0	4.0	4.50	9.00	2.0
20	15.0	5.00	13.0	5.0	5.00	10.00	2.0
22	17.0	6.00	15.0	5.0	5.50	11.00	2.5
24	18.0	6.00	16.0	6.0	6.00	12.00	2.5
27	21.0	8.00	-	7.0	6.70	13.50	-
30	23.0	8.00	-	7.0	7.50	15.00	-
33	26.0	10.00	-	8.0	8.20	16.50	-
36	28.0	10.00	-	8.0	9.00	18.00	-
39	30.0	12.00	-	8.0	9.70	19.50	-
42	32.0	12.00	-	8.0	10.50	21.00	-
45	35.0	14.00	-	11.0	11.20	22.50	-
48	38.0	14.00	-	14.0	12.00	24.00	-
52	42.0	16.00	-	-	13.00	26.00	-

• For ≤M5, the flat portion on the cone is not mandatory; a slight rounding of the end is permitted.