The surface treatment of self-drilling screws requires specific procedures. What manufacturing processes are generally used for surface treatment? Hebei Wotu Fastener Manufacturing Co., Ltd. will explain oxidation treatment below.
The surface treatment of self-drilling screws requires specific procedures. What manufacturing processes are generally used for surface treatment? Hebei Wotu Fastener Manufacturing Co., Ltd. will explain oxidation treatment below.
Black coating with oil is a popular plating for industrial fasteners because it is the cheapest and looks good until the oil runs out. Since black coating has almost no rust-preventing ability, it will rust quickly after the oil is removed. Even in an oiled state, its neutral salt spray test result is only 3-5 hours. At the same time, blackened self-drilling screw fasteners have poor torque-preload consistency. To improve this, grease can be applied to the internal threads before screwing them in during assembly. Hebei Wotu Fastener Manufacturing Co., Ltd. (formerly Handan Pingyuan High Strength Fastener Manufacturing Co., Ltd.), a manufacturer of self-drilling screws, was founded in the 1990s and is one of the largest high-strength fastener manufacturers in North China.
For an M10–M24 U-bolt RFQ, buyers should send a dimensioned drawing that defines thread diameter, inside width, leg or overall length, bend geometry, thread length, application diameter, material or grade requirement, surface finish, matching nuts/washers, quantity, and packing needs. Nominal thread size alone is not enough because different measurement datums can produce U-bolts that look […]
When ordering L-shaped anchor bolts against an older standard, buyers should verify the standard’s current status, confirm the specification approved for the project, and reconcile the drawing, dimensions, material and foundation interface before releasing the purchase order. A legacy standard number on a product page or old drawing is not, by itself, sufficient evidence that […]
