Left Hand Threaded Bolt set in black finish. Pack includes 2 pieces. Made from 40Cr steel for strength and durability. Each bolt weighs 8 g. Drive type is hexagon socket. Head is countersunk / flat. Thread size M5, total length 25 mm (1 inch), fully threaded. Head diameter 9.6 mm (0.38 in); hex socket width 3.1 mm (0.12 in); degree 10.9. Why you need this - Left-hand thread prevents loosening in assemblies that rotate in the opposite direction, helping maintain reliable fastening under operation. - High-strength 40Cr steel supports durable use in common mechanical assemblies. - Countersunk head allows flush mounting in compatible surfaces for a clean finish. - Fully threaded length provides flexible clamping range and adjustment. - Hex socket drive enables secure tightening with standard tools. Key specifications at a glance - Package: 2 pcs - Material: 40Cr steel - Color: Black - Thread size: M5 - Total length: 25 mm (1 inch) - Thread type: Fully threaded - Head: Countersunk / Flat - Head diameter: 9.6 mm (0.38 in) - Hex socket width: 3.1 mm (0.12 in) - Degree: 10.9 - Weight: 8 g Applications and use scenarios - Rotating machinery or components that require left-handed fasteners to resist loosening during operation. - Bicycle or equipment assemblies specified with left-hand threading where secure, flush mounting is desired. - Furniture, appliances, or electronic housings needing small, left-hand M5 bolts with a low-profile, finished look.