GOST 10906-78 Square Taper Washers. Specifications

State Standard of the Union of Soviet Socialist Republics

SQUARE TAPER WASHERS

SPECIFICATIONS

GOST 10906-78

SQUARE TAPER WASHERS Specifications Squaretaperwashers. Specifications	GOST 10906-78* Supersedes GOST 10906-66 in part of Section 1

This standard applies to square taper washers of product grade C, intended for placing under nuts or bolt heads to level 10% slopes of channel flanges and 12% slopes of I-beam flanges.

1. Design and dimensions

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

mm

Thread diameter of fastener		6	8	10	12	14	16	18	20	22	24	27
d		6.6	9.0	11.0	13.0	15.0	17.0	19.0	22.0	24.0	26.0	30.0
B	nom.	16		20	30			40			50
	tolerance	+1.0			+1.0			+1.0			+1.4
		-1.5			-1.7			-1.9			-2.3
s		5.8		6.2	7.3			8.4			9.5
(tolerance +0.3 -0.5)
s₁*		4.9		5.1	5.7			6.2			6.8

Example of designation for a square taper washer for a fastener with a thread diameter of 12 mm, made of St3 steel, with a 6 µm zinc coating, chromated:

Washer 12.02.St3.016 GOST 10906-78

The theoretical mass of washers is given in Appendix 1.

2. Technical requirements

Washers shall be manufactured from rolled steel to GOST 5157-83. Washers may be manufactured from strip and sheet steel.

The symmetry tolerance of the square relative to the hole axis, expressed diametrically, is 2 IT14 (to be determined by dimension B).

Technical requirements — in accordance with GOST 18123-82.

Temporary corrosion protection, packaging and container marking — in accordance with GOST 18160-72.

3. Acceptance rules

Acceptance rules for washers — in accordance with GOST 17769-83.

4. Test methods

Test methods for washers — in accordance with GOST 18123-82.

6. Application guidelines

Options for the application of square taper washers for channels and I-beams are given in Appendix 2.

APPENDIX 1

For reference

Mass of steel washers

Thread diameter of fastener, mm	Theoretical mass of 1000 pcs of washers, kg
6	8.5
8	7.4
10	12.2
12	34.3
14	32.1
16	29.9
18	64.1
20	59.4
22	55.9
24	104.4
27	95.7

Note. To determine the mass of washers made of other materials, the mass values given in the table shall be multiplied by the factor:

0.356 — for aluminium;

0.970 — for bronze;

1.080 — for brass.

APPENDIX 2

Recommended

Application of square taper washers for channels and I-beams

Thread diameter of fastener, mm	Washer width B	Minimum section numbers	Thread diameter of fastener, mm
		of channels to GOST 8240-72	of I-beams to GOST 8239-72
6	16	5	12
8
10	20	8	14
12	30	10	18
14		12
16		14	18a
18	40	16	22a
20		18	24a
22		20a	30a
24	50	22a	40
27		40	60

Corresponds to DIN 434, DIN 435.