M12 x 1.5, Lock Bolt, Radius Seat, 17/19 Hex

M12 x 1.5, Lock Bolt, Radius Seat, 17/19 Hex

A security wheel bolt with M12 × 1.5 thread and a radius (ball) seat, providing anti-theft protection on vehicles that use curved-contact wheel mounting faces. The coded internal key pattern cannot be engaged by standard sockets, while the dual 17/19mm hex outer body accepts the supplied key tool for authorised installation and removal.

Available in black or chrome, with thread lengths from 28mm to 45mm to accommodate different wheel thicknesses and spacer setups.

Quick Specifications

• Thread: M12 × 1.5
• Seat Type: Radius (ball/sphere seat)
• Key Hex: Dual 17mm / 19mm (key supplied)
• Thread Lengths: 28mm | 35mm | 40mm | 45mm
• Finish: Black zinc or chrome
• Material: Grade 10.9 forged steel
• SKU: KBR-228B
• Sold: Individually (1 lock bolt + 1 coded key)

Radius Seat vs Conical Seat - Which Do You Need?

This is the critical fitment decision for M12 bolt-pattern vehicles. A radius seat bolt has a rounded, curved contact face that matches the bowl-shaped hole in radius-seat wheels. A conical (60°) taper bolt has an angled flat face for a different wheel geometry. 

If your vehicle came with BMW OEM wheels, check whether they use a radius or conical seat; both exist in the BMW range. Check the existing bolt's contact face profile, or consult the wheel manufacturer's specification.

Common Applications

Commonly specified on vehicles using M12 × 1.5 radius-seat bolts, including:

• BMW: Selected models using OEM radius-seat alloy wheels (older 3 Series, 5 Series, Z4, and others, verify per model year)
• Mini: Selected models with radius-seat OEM wheels
• Mercedes-Benz: Selected models with M12 radius-seat bolt fitments