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Stainless steel screws usually refer to steel screws with resistance to the corrosion of air, water, acid, alkali salt or other media. Stainless steel screws are generally not easy to rust, durable, available in environmental protection equipment, medical equipment, communication equipment and other fields.
Classification of stainless steel screws 1: classification by head type
Stainless steel screws according to the head type can be generally divided into cylindrical head, half countersunk head, countersunk head, pan head, large flat head and hexagonal head.
Stainless steel screws classification two: according to the groove type classification
Stainless steel screws according to the groove type can be generally divided into cross groove, hexagon groove, a word groove, plum groove, etc.
Stainless steel screws are made of austenitic SUS304 stainless steel and SUS316 stainless steel materials. SUS304 stainless steel screws and SUS316 stainless steel screws contain more than 8 nickel, with high rust resistance.
The stainless steel fasteners we use are mainly made of austenite 302, 304, 316 and "low nickel" 201.
Mainly used for: environmental protection equipment, medical equipment, communication equipment, electric power facilities, electronic products, instruments, food machinery, petrochemical industry, ship assembly, pump valve pipeline, building curtain wall, outdoor occasions, sports facilities, outdoor decoration, etc.

mm | dc | s | k |
nominal diameter d | screw pitch P | max | min | max | min | max | min | ||
ST2.9 | 1.1 | 6.3 | 5.8 | 4 | 3.82 | 2.8 | 2.5 | ||
ST3.5 | 1.3 | 8.3 | 7.6 | 5.5 | 5.32 | 3.4 | 3 | ||
ST4.2 | 1.4 | 8.8 | 8.1 | 7 | 6.78 | 4.1 | 3.6 | ||
ST4.8 | 1.6 | 10.5 | 9.8 | 8 | 7.78 | 4.3 | 3.8 | ||
ST5.5 | 1.8 | 11 | 10 | 8 | 7.78 | 5.4 | 4.8 | ||
ST6.3 | 1.8 | 13.5 | 12.2 | 10 | 9.78 | 5.9 | 5.3 |
nominal diameter d | ST2.9 | ST3.5 | ST4.2 ST4.8 | ST4.8 | ST5.5 | ST6.3 | ||
Nominal length L | 1000 piece ≈ kg | |||||||
9.5 | 0.43 | 0.81 | ||||||
13 | 0.54 | 0.97 | 2.74 | 3.7 | ||||
16 | 0.63 | 1.65 | 2.94 | 3.93 | 5.02 | |||
19 | 0.72 | 1.79 | 3.14 | 4.2 | 5.37 | 8.66 | ||
22 | 1.93 | 3.34 | 4.46 | 5.72 | 9.14 | |||
25 | 2.07 | 3.53 | 4.73 | 6.07 | 9.62 | |||
32 | 3.99 | 5.35 | 6.89 | 10.74 | ||||
38 | 4.39 | 5.88 | 7.6 | 11.7 | ||||
45 | 6.5 | 8.42 | 12.82 | |||||
50 | 6.95 | 9.01 | 13.62 |



