Chongqing Hengtairail Equipment Co.,Ltd.
Global Rolling Stock Parts Supplier
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Railway Casting Parts Truck Fastener SFT locknut
Product overview
The working principle of the nut is to use the friction between the nut and the bolt for self-locking. Railway SFT lock nut is used for ZT type bolt, which is applied to the mounting of column wear plate on side frame for railway freight wagon bogie.
Product specification
| S.No. | Item | Value |
| 1 | Type | SFT locknut |
| 2 | Technical standard | Q/ZC35-062-2004, TJ/CL412-2014 |
| 3 | Production ability | 200,000pcs/month |
| 4 | Material | carbon steel, alloy steel |
| 5 | Process | Quenching and tempering heat treatment |
| 6 | Hardness | 28-37HRC |
| 7 | Mechanical property class | class 10 |
| 8 | Surface treatment | Oxidation treatment |
| 9 | Work temperature | -50 ℃ to 100 ℃(-58℉ to 212 ℉) |
Product advantages
· Superior of anti-vibration performance
· High abrasion and shear resistance
· Good of reuse performance
Below is the type of locknut
| Nominal diameter | h | D1 min | S | e (max) |
| M10 | 8.94-9.3 | 14.36 | 15.73-16 | 15.73 |
| M20 | 11.57-12 | 16.63 | 17.73-18 | 17.73 |
| M14 | 13.4-14.1 | 19.64 | 20.67-21 | 20.7 |
| M16 | 15.7-16.4 | 22.49 | 23.67-24 | 23.7 |
| M18 | 16.9-17.6 | 24.9 | 26.16-27 | 26.67 |
| M20 | 19-20.3 | 27.7 | 29.16-30 | 29.5 |
| M22 | 20.5-21.8 | 31.4 | 33-34 | 33.5 |
| M24 | 22.6-23.9 | 33.25 | 35-36 | 35.5 |
| M27 | 25.4-26.7 | 38 | 40-41 | 40.5 |
| M30 | 27.3-28.6 | 42.8 | 45-46 | 45.5 |
| Nominal diameter | h | D1(max) | S | e | a(after close) | b | c |
| M10 | 9.1-9.3 | 15.5 | 15.73-16 | 15.5 | 0.3-0.8 | 1.5-2 | 152±3° |
| M12 | 11.7-12 | 17.5 | 17.73-17 | 17.5 | 0.3-0.8 | 1.7-2.2 | 152±3° |
| M14 | 13.9-14.2 | 20.5 | 20.7-21 | 20.5 | 0.4-1.0 | 1.9-2.4 | 152±3° |
| M16 | 16.1-16.4 | 23.5 | 23.7-24 | 23.5 | 0.4-1.0 | 2.1-2.6 | 152±3° |
| M18 | 17.3-17.6 | 26.5 | 26.67-27 | 26.5 | 0.6-1.2 | 2.3-2.8 | 152±3° |
| M20 | 20-20.3 | 29.5 | 29.5-30 | 29.5 | 0.6-1.2 | 2.9-3.4 | 152±3° |
| M22 | 21.5-21.8 | 33.5 | 33.5-34 | 33.5 | 0.9-1.5 | 3.1-3.6 | 152±3° |
| M24 | 23.6-23.9 | 35.5 | 35.5-36 | 35.5 | 0.9-1.5 | 3.3-3.8 | 152±3° |
| M27 | 26.4-26.7 | 40.5 | 40.5-41 | 40.5 | 1.2-2.0 | 3.3-3.8 | 152±3° |
| M30 | 28.3-28.6 | 45.2 | 45.5-46 | 45.2 | 1.2-2.0 | 3.3-3.8 | 152±3° |