Square Washer Combination Screws
We take an M3×6 size as an example. The square washer has a side length of 6.5 mm. It fits a square hole on a switch or terminal block. The washer will not rotate. This avoids scratching the wire or conductive surface. The M3 thread works with a 6 mm washer outer diameter.
Press Wires Tight with Our Square Washer Screws
Do you need to clamp wires or bus bars? Regular round washers spin. They scratch the wires. Our Square Washer Combination Screws are made for switch parts and wire pressing. The washer is square. It fits into a square hole on the switch. The washer will not spin when you tighten the screw. We are a Shanghai factory. We have worked for 20 years.
Check Our Clamping Force and Coating Data
We take an M3×6 size as an example. The square washer has a side length of 6.5 mm. It fits a square hole on a switch or terminal block. The washer will not rotate. This avoids scratching the wire or conductive surface. The M3 thread works with a 6 mm washer outer diameter. It can clamp 0.5-1.5 mm² solid or stranded copper wire. The clamping force is ≥200 N. The wire stays tight. The total screw length is 6 mm. This fits thin switches or small electrical modules. The material is carbon steel SWRCH35K or 10B21. It gets carburizing heat treatment. Surface hardness is HV 450-550. Core hardness is HV 300-400. The strength grade is 8.8. Tensile strength is ≥800 MPa. The square washer is pre-assembled with the screw. The axial pull-out force is ≥40 N. Our surface finish is zinc-nickel alloy. The coating thickness is 8-12 μm.
|
Parameter |
Standard / Value |
|
Clamping Force (M3×6) |
≥ 200 N |
|
Square Washer Size |
6.5 mm x 6.5 mm |
|
Axial Pull-out Force |
≥ 40 N |
|
Salt Spray Test (Zn-Ni) |
≥ 720 hours (ASTM B117) |
Why Our Testing and Certification Support You
We have salt spray testers, 2D projectors, hardness testers, and optical sorters. We check every batch. We accept third-party inspections. We can do a 100% full check before packing. We passed IATF 16949:2016 certification. Zinc-nickel gives 5-8 times more corrosion resistance than normal zinc. It also has stable conductivity. Contact resistance is ≤5 mΩ. This is great for electrical use. Payment is 30% deposit and 70% balance. We take US dollars. Big orders get discounts.
The entire product line is fully customizable.
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