GOST 11648-75 Quick-Release Thrust Washers
GOST 11648-75 · Washers
This is an informational translation of a Russian national standard. The Russian original is authoritative.
GOST 11648-75 applies to quick-release thrust washers for shafts with a diameter from 2 to 20 mm.
1. Design and dimensions
The design and dimensions of the washers shall comply with those shown in the drawing and in Table 1.
Table 1
mm
| d H12 | D h12 | S | B H14 | b | r | r₁ | Shaft diameter d ₀ | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Nom. | Limit deviation | Nom. | Limit deviation | Nom. | Limit deviation | |||||
| 1.6 | 4 | 0.4 | ±0.04 | 1.8 | 1.3 | 1.3 | ±0.06 | 0.4 | +0.14 | From 2 to 2.5 |
| 2.0 | 6 | 2.4 | 1.7 | 2.1 | Over 2.5 to 4 | |||||
| 3.0 | 9 | 0.6 | ±0.05 | 3.6 | 2.6 | 3.3 | ±0.08 | 0.6 | Over 4 to 6 | |
| 5.0 | 12 | 0.8 | 5.5 | 4.4 | 4.4 | Over 6 to 8 | ||||
| 7.0 | 15 | 1.0 | ±0.07 | 8.0 | 6.2 | 5.6 | Over 8 to 10 | |||
| 9.0 | 18 | 1.2 | ±0.08 | 10.0 | 8.0 | 6.8 | ±0.10 | Over 10 to 12.5 | ||
| 12.0 | 24 | 13.0 | 10.8 | 9.5 | Over 12.5 to 16 | |||||
| 15.0 | 30 | 1.6 | ±0.11 | 16.0 | 13.5 | 12.0 | ±0.12 | Over 16 to 20 |
Example of a designation for a washer with inner diameter d = 5 mm, made of BrKMts3-1 bronze, with coating 07, thickness 6 µm:
Washer 5.BrKMts3-1.07.6 GOST 11648-75
2. Technical requirements
The washers shall be made of high-quality carbon structural steel grade 65G per GOST 14959-79 or of tin-free bronze grade BrKMts3-1 per GOST 18175-78.
By agreement between the manufacturer and the consumer, other material grades that provide the elastic properties of the washers may be used.
At the consumer’s request, the washers shall be made with a coating. Types and designations — per GOST 1759.0-87, GOST 1759.1-82, GOST 1759.2-82, GOST 1759.3-83, GOST 1759.4-87, GOST 1759.5-87.
In the Russian Federation, GOST R 52627-2006 and GOST R 52628-2006 have been in effect since 01.01.2008.
Coating selection — per GOST 9.303-84. Coating thickness is assigned in accordance with GOST 9.306-85 by agreement between the manufacturer and the consumer.
The surface of the washers shall be free of burrs, scratches, cracks, laps, tears, scale residue, delaminations, cavities and other defects. Surface defects permitted by the normative and technical documentation for the material from which the washers are made are not rejection criteria for the washers.
The washers shall not have sharp edges. Edge crushing of the washer is not a rejection criterion.
Flatness tolerance of the washer — not more than 0.1 mm.
Coaxiality tolerance of the diameter surface relative to the axis of the diameter surface for d<5 mm — not more than 0.04 mm, for d>5 mm — not more than 0.05 mm.
Symmetry tolerance of slot A relative to the axis of the inner diameter for d<7 mm — not more than 0.05 mm; for d>7 mm — not more than 0.1 mm; asymmetry of lug B — not more than 1°.
Steel washers shall have a hardness of HV 390+502, bronze washers — not less than HV 186.
Hydrogen and acid embrittlement of the washers arising during the coating process shall be removed.
Groove dimensions for the washers and permissible axial loads on the washers are given in Appendix 1.
The theoretical mass of the washers is given in Appendix 2.
3. Acceptance rules
Acceptance rules for the washers — per GOST 17769-83 for products of increased and normal accuracy. The lot size of washers shall not exceed 25,000 pcs.
4. Test methods
The appearance of the washers shall be checked visually.
Flatness deviation of the washers shall be checked using universal methods and means.
Coating control — per GOST 9.302-88.
Hardness determination — per GOST 2999-75.
The elasticity of the thrust washers shall be checked by fitting them three times onto a mandrel with a diameter equal to the groove diameter d. After this, the washers shall show no residual deformation.
5. Packaging and marking
Packaging of the washers and marking of containers — per GOST 18160-72.
Appendix 1 (informative)
Recommended groove dimensions and permissible axial loads for quick-release thrust washers
Table 1
mm
| d₀ | d₁ h 11 | b₁ | b₂ | |
|---|---|---|---|---|
| Nom. | Limit deviation | Min | ||
| From 2 to 2.5 | 1.6 | 0.5 | +0.06 | 0.4 |
| Over 2.5 to 4 | 2.0 | 0.8 | ||
| Over 4 to 6 | 3.0 | 0.7 | +0.06 | 1.2 |
| Over 6 to 8 | 5.0 | 0.9 | ||
| Over 8 to 10 | 7.0 | 1.1 | +0.10 | |
| Over 10 to 12.5 | 9.0 | 1.4 | 2.0 | |
| Over 12.5 to 16 | 12.0 | 2.5 | ||
| Over 16 to 20 | 15.0 | 1.8 | 3.5 |
Table 2
| Inner diameter of the washer d, mm | Permissible axial load on the washer, N (kgf) | |||
|---|---|---|---|---|
| steel | bronze | steel | bronze | |
| minimum | maximum | |||
| 1.6 | 70 (7) | 50 (5) | 100 (10) | 80 (8) |
| 2.0 | 100 (10) | 60 (6) | 350 (35) | 250 (25) |
| 3.0 | 300 (30) | 200 (20) | 700 (70) | 600 (60) |
| 5.0 | 450 (45) | 350 (35) | 1100 (110) | 900 (90) |
| 7.0 | 600 (60) | 500 (50) | 1400 (140) | 1000 (100) |
| 9.0 | 800 (80) | 600 (60) | 2400 (240) | 1800 (180) |
| 12.0 | 1000 (100) | 800 (80) | 2800 (280) | 2200 (220) |
| 15.0 | 1200 (120) | 1000 (100) | 4400 (440) | 3500 (350) |
Note. The minimum load values correspond to the lower limits of the shaft diameter ranges, the minimum values — to the upper limits of these ranges.
Appendix 2 (informative)
Mass of steel washers
| Shaft diameter d₀ | Theoretical mass of 1000 washers, kg |
|---|---|
| From 2 to 2.5 | 0.024 |
| Over 2.5 to 4 | 0.056 |
| ” 4 ” 6 | 0.180 |
| ” 6 ” 8 | 0.386 |
| ” 8 ” 10 | 0.693 |
| ” 10 ” 12.5 | 1.130 |
| ” 12.5 ” 16 | 1.940 |
| ” 16 ” 20 | 4.039 |
To determine the mass of bronze washers, multiply the mass value given in the table by a factor of 1.08.
Corresponds to DIN 6799.
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