GOST 397-79 Steel Cotter Pins
GOST 397-79 · Cotter pins
This is an informational translation of a Russian national standard. The Russian original is authoritative.
Steel cotter pins to GOST 397-79 — technical specifications.
This standard applies to cotter pins with a nominal diameter from 0.6 to 20 mm.
The design and dimensions of cotter pins shall conform to those shown in the drawing and in Tables 1 and 2.
| Nominal cotter pin diameter d g | 0.6 | 0.8 | 1.0 | 1.2 | 1.6 | 2.0 | 2.5 | 3.2 | 4.0 | 5.0 | 6.3 | 8.0 | 10.0 | 13.0 | 16.0 | 20.0 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| d | max. | 0.5 | 0.7 | 0.9 | 1.0 | 1.4 | 1.8 | 2.3 | 2.9 | 3.7 | 4.6 | 5.9 | 7.5 | 9.5 | 12.4 | 15.4 | 19.3 | |
| min. | 0.4 | 0.6 | 0.8 | 0.9 | 1.3 | 1.7 | 2.1 | 2.7 | 3.5 | 4.4 | 5.7 | 7.3 | 9.3 | 12.1 | 15.1 | 19.0 | ||
| k | max. | 1.6 | 1.6 | 1.6 | 2.5 | 2.5 | 2.5 | 2.5 | 3.2 | 4.0 | 4.0 | 4.0 | 4.0 | 6.3 | 6.3 | 6.3 | 6.3 | |
| min. | 0.8 | 0.8 | 0.8 | 1.3 | 1.3 | 1.3 | 1.3 | 1.6 | 2.0 | 2.0 | 2.0 | 2.0 | 3.2 | 3.2 | 3.2 | 3.2 | ||
| i | 2.0 | 2.4 | 3.0 | 3.0 | 3.2 | 4.0 | 5.0 | 6.4 | 8.0 | 10.0 | 12.6 | 16.0 | 20.0 | 26.0 | 32.0 | 40.0 | ||
| D | max. | 1.0 | 1.4 | 1.8 | 2.0 | 2.8 | 3.6 | 4.6 | 5.8 | 7.4 | 9.2 | 11.8 | 15.0 | 19.0 | 24.8 | 30.8 | 38.6 | |
| min. | 0.9 | 1.2 | 1.6 | 1.7 | 2.4 | 3.2 | 4.0 | 5.1 | 6.5 | 8.0 | 10.3 | 13.1 | 16.6 | 21.7 | 27.0 | 33.8 | ||
| Recommended diameters of mating parts | Bolt | Over | — | 2.5 | 3.5 | 4.5 | 5.5 | 7.0 | 9.0 | 11.0 | 14.0 | 20.0 | 27.0 | 39.0 | 56.0 | 80.0 | 120.0 | 170.0 |
| Up to | 2.5 | 3.5 | 4.5 | 5.5 | 7.0 | 9.0 | 11.0 | 14.0 | 20.0 | 27.0 | 39.0 | 56.0 | 80.0 | 120.0 | 170.0 | — | ||
| Pin, Axle | Over | — | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 | 9.0 | 12.0 | 17.0 | 23.0 | 29.0 | 44.0 | 69.0 | 110.0 | 160.0 | |
| Up to | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 | 9.0 | 12.0 | 17.0 | 23.0 | 29.0 | 44.0 | 69.0 | 110.0 | 160.0 | — |
The nominal cotter pin diameter da equals the diameter of the hole for the cotter pin.
| Cotter pin length l | Theoretical mass of 1000 steel cotter pins, kg, at nominal diameter d₀, mm | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nom. | Limit deviation | 0.6 | 0.8 | 1.0 | 1.2 | 1.6 | 2.0 | 2.5 | 3.2 | 4.0 | 5.0 | 6.3 | 8.0 | 10 | 13 | 16 | 20 |
| 4 | +0.5 | 0.008 | |||||||||||||||
| 5 | 0.010 | 0.021 | |||||||||||||||
| 6 | 0.011 | 0.024 | 0.042 | ||||||||||||||
| 8 | 0.013 | 0.029 | 0.053 | 0.068 | 0.140 | ||||||||||||
| 10 | +0.8 | 0.016 | 0.034 | 0.061 | 0.079 | 0.162 | 0.268 | ||||||||||
| 12 | 0.018 | 0.039 | 0.070 | 0.090 | 0.185 | 0.324 | 0.544 | ||||||||||
| 14 | 0.044 | 0.079 | 0.101 | 0.207 | 0.362 | 0.603 | 1.08 | ||||||||||
| 16 | 0.050 | 0.088 | 0.112 | 0.230 | 0.400 | 0.663 | 1.17 | 2.07 | |||||||||
| 18 | 0.097 | 0.123 | 0.252 | 0.441 | 0.723 | 1.27 | 2.23 | ||||||||||
| 20 | 0.106 | 0.134 | 0.275 | 0.479 | 0.782 | 1.37 | 2.39 | 3.93 | 7.3 | ||||||||
| 22 | 0.146 | 0.279 | 0.517 | 0.842 | 1.46 | 2.55 | 4.18 | 7.7 | |||||||||
| 25 | ±1.2 | 0.162 | 0.331 | 0.573 | 0.931 | 1.61 | 2.79 | 4.55 | 8.4 | ||||||||
| 28 | 0.365 | 0.630 | 1.021 | 1.75 | 3.03 | 4.93 | 9.0 | ||||||||||
| 32 | 0.410 | 0.705 | 1.140 | 1.95 | 3.35 | 5.43 | 9.8 | ||||||||||
| 36 | 0.781 | 1.268 | 2.14 | 3.67 | 5.93 | 10.7 | |||||||||||
| 40 | 0.856 | 1.387 | 2.33 | 3.99 | 6.43 | 11.5 | 19.7 | ||||||||||
| 45 | 1.536 | 2.58 | 4.39 | 7.05 | 12.5 | 21.7 | 37.9 | ||||||||||
| 50 | ±1.2 | 1.685 | 2.82 | 4.79 | 7.80 | 13.6 | 23.3 | 40.6 | |||||||||
| 56 | 3.11 | 5.27 | 8.55 | 14.8 | 25.4 | 43.9 | |||||||||||
| 63 | ±2.0 | 3.44 | 5.83 | 9.43 | 16.3 | 27.7 | 47.7 | ||||||||||
| 71 | 6.47 | 10.42 | 17.9 | 30.4 | 52.0 | 97 |
mm
Continuation of Table 2
| Cotter pin length l | Theoretical mass of 1000 steel cotter pins, kg, at nominal diameter d₀, mm | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hc min | Limit deviation | 0.6 | 0.8 | 1.0 | 1.2 | 1.6 | 2.0 | 2.5 | 3.2 | 4.0 | 5.0 | 6.3 | 8.0 | 10 | 13 | 16 | 20 |
| 80 | +3.0 | 7.18 | 11.55 | 19.8 | 33.5 | 57.0 | 105 | ||||||||||
| 90 | 12.80 | 21.9 | 36.8 | 62.4 | 115 | ||||||||||||
| 100 | 14.04 | 23.9 | 40.2 | 67.8 | 124 | ||||||||||||
| 112 | 26.4 | 44.3 | 74.3 | 136 | 215 | ||||||||||||
| 125 | 29.1 | 48.7 | 81.4 | 148 | 233 | ||||||||||||
| 140 | 53.7 | 89.6 | 162 | 255 | |||||||||||||
| 160 | 60.6 | 100.5 | 181 | 284 | 467 | ||||||||||||
| 180 | 111.4 | 200 | 312 | 512 | |||||||||||||
| 200 | 122.3 | 219 | 341 | 558 | |||||||||||||
| 224 | 261 | 375 | 612 | ||||||||||||||
| 250 | 266 | 413 | 671 | ||||||||||||||
| 280 | 456 | 738 |
Note. To determine the mass of cotter pins made from other materials, the mass values given in the table shall be multiplied by a factor of: 1.080 for brass; 0.356 for aluminium alloy.
| Material | Material designation | Coating type |
|---|---|---|
| Low-carbon steels with a carbon content of not more than 0.20% to GOST 1050-88 and GOST 380-94 | 0 | Zinc, chromated Cadmium, chromated Oxide Phosphate with oil impregnation |
| Corrosion-resistant steel 12Kh18N10T to GOST 5632-72 | 2 | Oxide from acid solutions |
| Brass L63 to GOST 15527-2004 | 3 | Nickel |
| AMts to GOST 4784-97 | 4 | Oxide, sealed in potassium bichromate solution |
| Nominal cotter pin diameter d₀ | Radius of rounding of vice jaw edges R | |
|---|---|---|
| Nom. | Limit deviation | |
| Up to 2 | 0.5 | |
| Over 2 to 5 | 0.8 | +0.1 |
| » 5 | 1.2 |
Each 90° movement of the bent end is counted as one bend.
The test is carried out at a rate of not more than one bend per second.
Methods for checking coating quality and thickness — per GOST 9.302—88.
Material grade 0 (low-carbon steel) and the absence of coating are not indicated in the designation.
Example of a designation for a cotter pin with a nominal diameter of 5 mm, length 28 mm, made of low-carbon steel, without coating:
Cotter pin 5×28 GOST 397-79
Corresponds to DIN 94 and ISO 1234.
Estimate for the “GOST 397-79” category
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