Black Bulge Acorn Steel Lug Nuts Wheel Nut

Black Bulge Acorn Steel Lug Nuts Wheel Nut 

By matching this lug's specs (thread seating style hex etc.) to match both your vehicle and wheel requirements (Car Reference), and you can refer to the exact compatible model of vehicles in the product description.  Bulge acorn wheel lug Nuts with essential layers of copper nickel and chrome to provide exceptional strength beauty and corrosion resistance.  Black lug nuts are manufactured with cold forged and heat treated steel for dependable strength and durability, paint will not fall off easily. Lug nuts undergo industry-standard proof-load testing to ensure strength.

Basic Introduction About Hyunto Nut
Wenzhou Hyunto Automobile parts Co.,Ltd is a professional and large scale company specializing in the production of all kinds of products including fasteners,nut parts,turning parts and non-standard parts. 
As an OEM, HYUNTO are able to produce CUSTOMIZED nuts under different standard(DIN, ANSI, GB, JIS, BSW, EN etc), by various materials(carbon steel, alloy steel etc). 

A summary of the production process:

1.Wire - Uncoiled, straightened and cut to length.

2.Cold forging - Molding the steel into the right shape at room temperature.

3.Bolt head - Progressively formed by forcing the steel into various dies at high pressure.

4.Threading - Threads are formed by rolling or cutting.

5.Heat treatment - The bolt is exposed to extreme heat to harden steel.

6.Surface treatment - It depends on the application. Zinc-plating is common to increase corrosion resistance.

7.Packing/stocking - After quality control to ensure uniformity and consistency, the Bolts are packaged.

A summary of the production Testing