M3, M4, M5, M6, M8, M10, M12, M16 Metric Coarse Pitch Thread
Hex Flange Nuts Serrated Flanged Nuts DIN 6923 
201 Stainless Steel, A2 Stainless Steel, A4 Stainless Steel
High-quality materials, environmentally friendly,  safe and reliable, durable and long life. 
Excellent craftsmanship, Smooth without burrs, quick and simple use.
● System of Measurement: Metric
● Standard: GB /T 6177 (ISO 4161) (DIN 6923) 
● Drive Style: External Hex
● Nuts Material: 
- 201 Stainless Steel ( SUS201 ) 
- A2 Stainless Steel  ( SUS304 ) ( 304 Stainless Steel )
- A4 Stainless Steel  ( SUS316 ) ( 316 Stainless Steel )
● Coarse Thread
● Thread Size: M3, M4, M5, M6, M8, M10 , M12, M16
● Thread Diameter: 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 16 mm