Thumb bolt, named by its shape with flat lines on its head which looks like a thumb.
Haiyan bolt produces this thumb bolt mostly in low carbon steel.
Description of thumb bolt:
Brand name: HB(HAIYAN BOLT)
Standard: OEM, Customized
Size: M5, M6, M8, M10,M12.
Length: open to customer request.
Surface finish: zinc plated white or yellow, black oxide.
Grade: 4.8
Material: low carbon steel.
Supply ability: 50 tons per month.
