Factory Outlet Carbon Steel Non Standard Thread Blue Zinc Plated T-bolt with Square Neck Grade 4.6 / 5.8 / 8.8 / 10.9 T-head bolt

• Non-standard carbon-steel T-bolt is manufactured strictly to customer-supplied drawings; head width, neck height, thread length and pilot radius can be adjusted freely within M6–M20 and 25 mm–200 mm overall length. CNC cold forging guarantees a minimum 0.05 mm profile tolerance, while the under-head fillet is machined to R0.2–R2.0 mm to eliminate stress concentration. Every lot is 100 % checked with optical comparators and thread ring gauges to ensure the parts drop into T-slot grooves or weld fixtures without secondary re-work.

  
  

Forged from 1022/1035 carbon steel, the blue-white zinc plated T-bolt delivers minimum tensile strength 800 MPa (Grade 8.8) and proof load 600 MPa. After 48 h salt-spray test (ASTM B117) the white-rust area is <5 %, and red-rust appears only after 72 h, outperforming regular zinc plating by 1.5×. Temperature operating window is –40 °C to +200 °C; impact toughness @ –20 °C ≥27 J (ISO 898-1). Full traceability with raw-mill test certificates is available for each heat number.

The fastener receives a trivalent Cr(III) blue passivation layer 8–12 µm thick, followed by a top-coat sealer for 96 h neutral salt-spray white-rust protection. RoHS and REACH compliance is certified; hexavalent chromium, lead and cadmium are undetectable (<0.01 %). Coefficient of friction is stabilized at 0.12–0.18 μk, making repeated torqueing reproducible within ±5 %—ideal for automatic calibration rigs and safety guard rails.

This blue-zinc T-head bolt is purposely engineered for quick-mount safety fences on aluminum T-slot framing, solar-module clamping rails, and 3D welding tables. The wide hammer-head distributes clamping force to 40 % more contact area than square-neck bolts, preventing groove deformation in soft aluminum profiles. Pair with our captive anti-loss flange nut to cut installation time by 30 % on high-line automation cells. Custom stampings, laser logos or colored top-coats are available for OEM branding.

• Parts are bulk-packed in 5-ply export cartons (25 kg max) with VCI anti-rust paper and silica-gel desiccant; each carton is strapped and shrink-wrapped to pass 1.2 m drop test. Plastic 20 kg reusable pails or Euro-size 400×300 mm plastic bins are optional for line-side feeding. HS-Code 7318.15.00, COO certificate and RoHS report ship with every lot. Lead time for 20 GP container (≈22 t) is 18–22 days after drawing approval; FOB, CIF and DDP incoterms are all supported.