Bolt Length Calculator

Hardware sizing for flat or angled risers — including separate front and rear sizing for wedge pads.

Skateboard hardware uses the #10-32 UNF thread standard. Sizes are listed in fractional inches as sold at skate shops worldwide.

Hardware Sizing

On angled risers the front and rear bolts pass through different amounts of material — enter both heights to get independent sizing for each side.

Standard 7-ply maple is 10–13 mm. Check your deck spec if unsure.

Most standard baseplates are 3–4 mm. Measure yours for a precise result.

1/8" = 3.175 mm  ·  1/4" = 6.35 mm  ·  1/2" = 12.7 mm

Nylon locknut height ~5.5 mm + 2–3 mm thread past the nut. 8 mm is a safe starting point.

Recommended Hardware

Hardware Length

1"

Stack

22.0 mm
Always confirm at least 2–3 mm of thread extends past the nut on your actual setup before riding. Sizing is a starting-point recommendation based on standard stack measurements.
Standard sizes available at skate shops: 7/8", 1", 1 1/8", 1 1/4", 1 1/2", 1 3/4", 2".

Bolt Length — Common Questions

What size bolts do I need for skateboard risers?

Skateboard hardware uses the #10-32 UNF thread standard. Length depends on your deck thickness, riser height, and baseplate thickness. For a standard no-riser setup (11mm deck, 3mm baseplate), 1" hardware is typical. Each 1/8" (3.175mm) of riser usually requires stepping up one bolt size.

How do I measure bolt length for a wedge riser?

On a wedge riser, the front and rear bolt holes pass through different amounts of material — you need to size each side separately. Use Angled / Wedge mode above, enter both front and rear heights, and the calculator returns independent sizes for each side.

What bolt sizes are available at skate shops?

Standard skateboard hardware comes in: 7/8", 1", 1 1/8", 1 1/4", 1 1/2", 1 3/4", and 2". This calculator rounds up to the nearest available size to ensure sufficient thread engagement.

How much thread should extend past the nut?

At least 2–3mm of thread should extend beyond the nylon locknut. The locknut itself is approximately 5.5mm tall. This calculator uses 8mm total engagement as a safe default — you can adjust this in the Nut + Thread Engagement field above.

What should I know before 3D printing a skateboard riser?

PETG is recommended for outdoor riser pads because it handles heat better than PLA. PLA is useful for first test prints and fit checks. For riding parts, print at 100% infill, use enough walls/perimeters, orient the pad flat on the bed, and inspect the finished part for cracks, layer separation, or heat deformation before riding.

Can I use the same bolt length on front and rear with a wedge riser?

Only if the front and rear thicknesses are equal (flat pad). On a true wedge, the thicker side needs longer bolts. Always calculate both sides separately when using angled risers.

Can I design and 3D print my own riser pad?

Yes — that's exactly what RISER 3D Builder is for. Set your height, angle, and hole pattern, then export an STL file ready to print. Use the print guidance above before riding on any printed part.