Special Fasteners

Solar Panel Fixing Screws

We follow ASTM B117 for neutral salt spray testing. SUS304 with passivation gives ≥720 hours with no red rust. SUS316 with passivation gives ≥1000 hours with no red rust. Without passivation, SUS304

Unique Seat Screws

We take an M8×1.25, grade 12.9 seat screw as an example. The proof load is ≥30 kN. The failure load is ≥36 kN. We follow GB/T 11557 or FMVSS 207 for seat impact testing. Under a 20g acceleration

Automotive Door Hinge Pins

We take a φ10 mm hinge pin as an example. The double shear failure load is ≥35 kN. This force can hold a heavy SUV or MPV door. We follow GB/T 13683 or ISO 3800 for axial fatigue testing. Under a

Painted Head Sheet Metal Screws

We follow ASTM D3359 for cross-cut paint adhesion testing. The adhesion rating is 4B or 5B. The cut edges are smooth with no peeling. We wipe with alcohol or acetone 50 times. The paint does not fade

Super Long Screws

We take an M10×250 mm super long screw as an example. The total length straightness is ≤0.4 mm. It can easily go through a 250 mm long stacked part hole. The hole diameter is φ10.5-11 mm. The single