An M6 bolt is 6.00 mm (0.236") in diameter. The stocked match is a 1/4" (6.35 mm) inside diameter — 0.35 mm of clearance, the classic fit for the most common metric bolt size in appliances, furniture, automotive trim and electronics. All sizes ship in seven rubber materials.
Best in-stock matches for M6
| Washer size | Fit |
|---|---|
| 5/8" OD × 1/4" ID × 1/16" | Compact, general purpose |
| 3/4" OD × 1/4" ID × 1/16" | Wider sealing face |
| 1" OD × 1/4" ID × 1/8" | Fender-style, more compression |
| 1-1/4" OD × 1/4" ID × 1/8" | Maximum coverage |
Browse every 1/4" ID rubber washer for more OD and thickness options.
Sizing note
For sealing against a 6.5–7 mm drilled hole, pick an OD at least 3× the hole diameter so the rubber bridges and compresses around it. A 1/16" thickness suits flat mating faces; 1/8" absorbs surface irregularities and vibration.
More metric bolts: M4 · M5 · M8 · M10 · M12 · M16 · M20 — or see the metric conversion guide, Size Finder and size chart.
FAQ
What size rubber washer fits an M6 bolt?
A 1/4" (6.35 mm) inside diameter rubber washer fits a 6 mm M6 bolt with 0.35 mm of clearance — the standard substitution.
What is an M6 rubber washer in inches?
M6 refers to the bolt: 6 mm ≈ 0.236". The matching washer is 1/4" ID, available here in ODs from 7/16" to 4".