Standard:	DIN931 933
Grade:	4.8/6.8/8.8/10.9/12.9
Material:	Low carbon steel/medium carbon steel/alloy steel
Size:	M3-M100; 1/4"-3"
Finish:	black/zinc plated/hot dip galvanized
Mark:	According to customer's requirement
Delivery time:	Normally in 30-40 days.
Quality:	Top high quality.
Package:	Cartons&pallets or according to customer's requirement.

Product advantages: Precision Machining Measure and process using precision machine tools and measuring tools under strictly controlled environmental conditions. High-quality carbon steel(35#/45#) With long life, low heat generation, high hardness, high rigidity, low noise, high wear resistance and other characteristics. Cost-effective ☆ The use of high-quality carbon steel steel, after precision processing and forming, greatly improves the user experience. Surface treatment: BLACK Black is a common method for metal heat treatment. The principle is to make an oxide film on the metal surface to isolate the air and achieve rust prevention. Blackening is a common method for metal heat treatment. The principle is to make an oxide film on the metal surface to isolate the air and achieve rust prevention.