Open Nut Flat Seated, 19 Hex, 17 Height

An open-ended wheel nut with a flat seating surface, designed for steel wheels and applications requiring a washer-style contact area. The 19mm hex head provides higher torque capacity than standard 17mm nuts, making this ideal for commercial vehicles and heavy-duty use.

Specifications

• Thread Options: M12 × 1.25 or M12 × 1.5
• Seat Type: Flat (washer seat) for steel wheels
• Hex Size: 19mm across flats (larger for commercial torque)
• Length: 17mm overall height (compact design)
• Finish: Black zinc or silver zinc coating
• Material: Grade 10.9 heat-treated carbon steel

When to Use Flat Seat Nuts

Flat seat nuts are essential when:

• Fitting steel wheels (which have flat mounting surfaces, not conical)
• Using hub-centric rings or spacers with flat contact areas
• Replacing OE nuts on vehicles with flat wheel mounting faces
• Working with trailer wheels or commercial vehicle applications

Available Finishes

• Black: Durable black zinc coating for a modern appearance
• Silver: Bright zinc finish for a traditional look

Fitment Note

Not compatible with alloy wheels that require conical (60°) seats. Always match the nut seat type to your wheel's mounting surface to ensure proper clamping force and safety.