cotter pin
GB91
Diameter range Φ1-Φ13 Length range 6mm-200mm
| standard | GB national standard |
|---|---|
| head shape | bending |
| (mm) | Φ0.6 | Φ0.8 | Φ1 | Φ1.2 | Φ1.6 | Φ2 | Φ2.5 | Φ3.2 | Φ4 | Φ5 | Φ6.3 | Φ8 | Φ10 | Φ13 | Φ16 | Φ20 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| d(max) | 0.5 | 0.7 | 0.9 | 1 | 1.4 | 1.8 | 2.3 | 2.9 | 3.7 | 4.6 | 5.9 | 7.5 | 9.5 | 12.4 | 15.4 | 19.3 |
| d(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 |
| a(max) | 1.6 | 1.6 | 1.6 | 2.5 | 2.5 | 2.5 | 2.5 | 3.2 | 4 | 4 | 4 | 4 | 6.3 | 6.3 | 6.3 | 6.3 |
| a(min) | 0.8 | 0.8 | 0.8 | 1.25 | 1.25 | 1.25 | 1.25 | 1.6 | 2 | 2 | 2 | 2 | 3.15 | 3.15 | 3.15 | 3.15 |
| c(max) | 1 | 1.4 | 1.8 | 2 | 2.8 | 3.6 | 4.6 | 5.8 | 7.4 | 9.2 | 11.8 | 15 | 19 | 24.8 | 30.8 | 38.5 |
| c(min) | 0.9 | 1.2 | 1.6 | 1.7 | 2.4 | 3.2 | 4 | 5.1 | 6.5 | 8 | 10.3 | 13.1 | 16.6 | 21.7 | 27 | 33.8 |
| Material | Carbon steel: Q215, Q235 (GB/T 700); | Carbon steel: Q215, Q235 (GB/T 700); |
| Copper alloy: H63 (GB/T 5232); | Copper alloy: H63 (GB/T 5232); | |
| Stainless steel: 1Cr17Ni7, 0Cr18Ni9Ti (GB/T 1220); | Stainless steel: 1Cr17Ni7, 0Cr18Ni9Ti (GB/T 1220); | |
| Other materials are subject to agreement between the supplier and the buyer | Other materials are subject to agreement between the supplier and the buyer | |
| toughness | Each leg of the cotter pin should be able to withstand repeated bending without breaking or cracking in the bent portion. | Each leg of the cotter pin should be able to withstand repeated bending without breaking or cracking in the bent portion. |
| Bending method: Pull the cotter pin apart, clamp any straight leg part of it in the inspection die (no flattening should occur), then bend the cotter pin 90°, one round trip is one bend. The test speed should not exceed 60 times/min. The inspection die should be made with a semicircular slot hole, the diameter of which is equal to the nominal specification of the cotter pin, and the jaws should have a fillet of r=0.5mm. | Bending method: Pull the cotter pin apart, clamp any straight leg part of it in the inspection die (no flattening should occur), then bend the cotter pin 90°, one round trip is one bend. The test speed should not exceed 60 times/min. The inspection die should be made with a semicircular slot hole, the diameter of which is equal to the nominal specification of the cotter pin, and the jaws should have a fillet of r=0.5mm. | |
| work quality | ①The eye sockets should be made as round as possible. | ①The eye sockets should be made as round as possible. |
| ② The cross-section of the two legs of the cotter pin should be circular, but a fillet with a radius of r = (0.05~0.1) dmax is allowed at the intersection of the planes of the two legs of the cotter pin and the circumference. | ② The cross-section of the two legs of the cotter pin should be circular, but a fillet with a radius of r = (0.05~0.1) dmax is allowed at the intersection of the planes of the two legs of the cotter pin and the circumference. | |
| ③ The gap between the two legs of the cotter pin and the offset between the two legs should not be greater than the difference between the nominal specification of the cotter pin and dmax. | ③ The gap between the two legs of the cotter pin and the offset between the two legs should not be greater than the difference between the nominal specification of the cotter pin and dmax. | |
| ④ Split pins are allowed to be made into split ones (α - the angle between the inner planes of the two legs); nominal specifications ≤1.6mm, α≤8°; 2~6.3mm, α≤4°; ≥8mm, α≤2° | ④ Split pins are allowed to be made into split ones (α - the angle between the inner planes of the two legs); nominal specifications ≤1.6mm, α≤8°; 2~6.3mm, α≤4°; ≥8mm, α≤2° | |
| surface defects | Burrs, irregularities and harmful defects are not allowed | Burrs, irregularities and harmful defects are not allowed |
| surface treatment | steel; | steel; |
| Copper, stainless steel | Copper, stainless steel | |
| Without treatment; | Simple handling | |
| Galvanizing passivation according to GB/T 5267; | ||
| Phosphating according to GB/T 11376 | ||
| Other surface coatings or surface treatments shall be agreed upon by both parties. | Other surface coatings or surface treatments shall be agreed upon by both parties. | |
| Acceptance and packaging | GB/T 90 | GB/T 90 |
