12.9 grade imperial concave end hex socket tightening screws are high-strength industrial fasteners, engineered for precision and heavy-load applications. Covering a range of imperial thread sizes—1/8-44, 3/16-24, 5/32-32, and 1/8-40BSW (British Standard Whitworth)—they are ideal for machinery, automotive components, precision tools, and equipment requiring secure, vibration-resistant fastening with imperial compatibility.
Crafted from heat-treated high-grade alloy steel, the 12.9 grade rating delivers exceptional tensile strength, wear resistance, and torque capacity, exceeding standard fasteners in demanding industrial environments. The concave end design ensures precise seating and targeted force application, while the internal hex socket drive enables secure torque control and slip-proof installation with standard imperial tools. The inclusion of 1/8-40BSW thread caters to legacy and British-standard equipment, enhancing versatility across global industrial setups.
Core Features & Advantages
12.9 grade heat-treated alloy steel for superior high-strength and heavy-load performance
