Square Head Bolts-Black Oxide Carbon Steel Square Machine Screws-T-Bolt for Machinery Railroad Electrical Connections

描述

1.High-Strength Performance – Precision-forged from medium-carbon steel and heat-treated to reach ISO Grade 8.8 strength (≈ 800 MPa tensile, 640 MPa yield) and Grade 10.9 Grade 12.9. The square-T head nests securely in common T-slot tables and extrusion channels, resisting twist under heavy clamp loads, while the black-oxide conversion coating lowers surface friction for smoother tightening and offers light corrosion and glare protection without affecting thread fit.

2.Broad Application Range – widely used in mechanical equipment, building structures and automobile manufacturing, such as the assembly and fixation of guardrails, home appliances, pipeline installation, equipment, steel frame houses, etc； And used throughout machining centres, drill presses, welding fixtures, modular aluminium-profile frames, construction formwork and agricultural equipment—anywhere a low-profile fastener must slide into a T-slot and lock firmly for jigs, stops, vises or work-holding clamps. Suitable for indoor shop environments and sheltered outdoor service from -50 °C to +300 °C.

3.Easy to Operate – Simply drop the T-square head into the slot and quarter-turn to engage; the square shape prevents rotation as the nut is tightened, so only one tool (wrench, socket or impact driver) is needed on the nut side. Rolled metric or UNC threads run smoothly, and the black-oxide finish provides a light lubricating film for consistent, chatter-free torque application.

4. Proven Quality – Manufactured under ISO 9001 systems and compliant with DIN 478 / ASME B18.2.1 dimensional tolerances and ISO 898-1 mechanical requirements. Each production lot is thread-gauge checked, hardness-verified, magnetic-particle crack-inspected and sample salt-spray tested; full EN 10204 3.1 material certificates and batch traceability are supplied on request, ensuring dependable, long-service performance in demanding workshop conditions.