Specification: GOST 22354-77 High-Strength Nuts of Product Grade B

GOST 22354-77 establishes the design and dimensions of hexagon nuts of product grade B for high-strength bolts per GOST 22353-77.

The design and dimensions of the nuts shall comply with those shown in the drawing and table.

mm

Nominal thread diameter d		16	(18)	20	(22)	24	(27)	30	36	42	48
Thread pitch		2	2.5			3		3.5	4	4.5	5
Height m		15	16	18	19	22	24		29	34	38
Width across flats S		27	30	32	36	41	46		55	65	75
Circumscribed circle diameter e, min		29.9	33.3	35.0	39.6	45.2	50.9		60.8	72.1	83.4
d a	min	16	18	20	22	24	27	30	36	42	48
	max	17.3	19.4	21.6	23.8	25.9	29.2	32.4	38.9	45.4	51.8

Note. Dimensions in brackets are not recommended for use.

Example of designation of a nut with thread diameter d = 20 mm, tolerance class 6H, for a bolt with minimum tensile strength = 1100 MPa (110 kgf/mm²), climatic version U, placement category 1:

Nut M20-6H.110 GOST 22354-77

Same, climatic version KhL, placement category 1:

Nut M20-6H.110.KhL1 GOST 22354-77

Thread — per GOST 24705-81.

Tolerances not specified in the drawing and table, as well as methods for checking dimensions and deviations of form and location of surfaces — per GOST 1759.1-82.

Surface defects and inspection methods — per GOST 1759.3-83.

Technical requirements — per GOST 22356-77.

The theoretical mass of nuts is given in the reference appendix.

Theoretical mass of nuts

Nominal thread diameter d, mm	Theoretical mass of 1000 pcs. of nuts, kg	Nominal thread diameter d, mm	Theoretical mass of 1000 pcs. of nuts, kg
16	50	(27)	224
(18)	66	30	213
20	80	36	368
(22)	108	42	611
24	171	48	921