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Standards

GOST 8724-81METRIC THREAD. DIAMETERS AND PITCHES

GOST 8724-81 · Threads

This is an informational translation of a Russian national standard. The Russian original is authoritative.

GOST 8724-81 (ST SEV 181-75) applies to general-purpose metric threads with a profile per GOST 9150-81 and establishes their diameters in the range from 0.25 to 600 mm and pitches from 0.075 to 6 mm. Effective date: 01.01.82.

Basic norms of interchangeability METRIC THREAD Diameters and pitches Basic norms of interchangeability. Metric screw thread. Diameters and pitchesGOST 8724-81 (ST SEV 181-75) Supersedes GOST 8724-58 and GOST 9000-73 (regarding diameters and pitches)

Thread diameters and pitches shall conform to those specified in the table.

When selecting thread diameters, the first series should be preferred over the second, and the second over the third.

Thread diameters and pitches shown in brackets are not recommended for use.

Nominal thread diameter dPitches P
1st series2nd series3rd seriescoarse64321.51.2510.750.50.350.250.2
0.25--0.075------------
0.3--0.08------------
-0.35-0.09------------
0.4--0.1------------
-0.45-0.1------------
0.5--0.125------------
-0.55-0.125------------
0.6--0.15------------
-0.7-0.175------------
0.8--0.2------------
-0.9-0.225------------
1--0.25-----------0.2
-1.1-0.25-----------0.2
1.2--0.25-----------0.2
-1.4-0.3-----------0.2
1.6--0.35-----------0.2
-1.8-0.35-----------0.2
2--0.4----------0.25-
-2.2-0.45----------0.25-
2.5--0.45---------0.35--
3--0.5---------0.35--
-3.5-(0.6)---------0.35--
4--0.7--------0.5---
-4.5-(0.75)--------0.5---
5--0.8--------0.5---
--(5.5)---------0.5---
6--1-------0.750.5---
--71-------0.750.5---
8--1.25------10.750.5---
--9(1.25)------10.750.5---
10--1.5-----1.2510.750.5---
--11(1.5)------10.750.5---
12--1.75----1.51.2510.750.5---
-14-2----1.51.2510.750.5---
--15-----1.5-(1)-----
16--2----1.5-10.750.5---
--17-----1.5-(1)-----
-18-2.5---21.5-10.750.5---
20--2.5---21.5-10.750.5---
-22-2.5---21.5-10.750.5---
24--3---21.5-10.75----
--25----21.5-(1)-----
--(26)-----1.5-------
-27-3---21.5-10.75----
--(28)----21.5-1-----
30--3.5--(3)21.5-10.75----
--(32)----21.5-------
-33-3.5--(3)21.5-10.75----
--35-----1.5-------
36--4--321.5-1-----
--(38)-----1.5-------
-39-4--321.5-1-----
--40---(3)(2)1.5-------
42--4.5-(4)321.5-1-----
-45-4.5-(4)321.5-1-----
48--5-(4)321.5-1-----
--50---(3)(2)1.5-------
-52-5-(4)321.5-1-----
--55--(4)(3)21.5-------
56--5.5-4321.5-1-----
--58--(4)(3)21.5-------
-60-(5.5)-4321.5-1-----
--62--(4)(3)21.5-------
64--6-4321.5-1-----
--6511(4)(3)21.5-------
-68-6-4321.5-1-----
--70-(6)(4)(3)21.5-------
72---64321.5-1-----
--75--(4)(3)21.5-------
-76--64321.5-1-----
--(78)----2--------
80---64321.5-1-----
--(82)----2--------
-85--64321.5-------
90---64321.5-------
-95--64321.5-------
100---64321.5-------
-105--64321.5-------
110---64321.5-------
-115--64321.5-------
-120--64321.5-------
125---64321.5-------
-130--64321.5-------
--135-64321.5-------
140---64321.5-------
--145-64321.5-------
-150--64321.5-------
--155-6432--------
160---6432--------
--165-6432--------
-170--6432--------
--175-6432--------
180---6432--------
--185-6432--------
-190--6432--------
--195-6432--------
200---6432--------
--205-643---------
-210--643---------
--215-643---------
220---643---------
--225-643---------
--230-643---------
--235-643---------
-240--643---------
--245-643---------
250---643---------
--255-643---------
-260--643---------
--265-643---------
--270-643---------
--275-643---------
280---643---------
--285-643---------
--290-643---------
--295-643---------
-300--643---------
--310-64----------
320---64----------
--330-64----------
-340--64----------
--350-64----------
360---64----------
--370-64----------
-380--64----------
--390-64----------
400---64----------
--410-6-----------
-420--6-----------
--430-6-----------
--440-6-----------
450---6-----------
--460-6-----------
--470-6-----------
-480--6-----------
--490-6-----------
500---6-----------
--510-6-----------
-520--6-----------
--530-6-----------
--540-6-----------
550---6-----------
--560-6-----------
--570-6-----------
-580--6-----------
--590-6-----------
600---6-----------

Notes:

  1. Thread M14×1.25 is used only for spark plugs.

  2. Thread M35×1.5 is used only for ball bearing lock nuts.

  3. The thread designation shall include: the letter M, the nominal thread diameter, the numerical value of the pitch (only for fine-pitch threads), and the letters LH for a left-hand thread.

Example of designation for a thread with a nominal diameter of 24 mm and coarse pitch: M24

Same, with a fine pitch of 2 mm: M24×2

Same, left-hand thread with coarse pitch: M24 LH

The designation of a multi-start thread shall include: the letter M, the nominal thread diameter, the numerical value of the lead, and, in brackets, the letter P and the numerical value of the pitch.

Example of designation for a three-start thread with a nominal diameter of 24 mm, a lead of 3 mm and a pitch of 1 mm: M24×3 (P1)

Same, left-hand thread: M24×3 (P1) LH

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