An M5 bolt is 5.00 mm (0.197") in diameter. Two stocked inside diameters work: 3/16" (4.76 mm) stretches on for a snug sealing fit, and 1/4" (6.35 mm) gives an easy clearance fit. Every size ships in all seven rubber materials.
Best in-stock matches for M5
| Washer size | Fit |
|---|---|
| 1/2" OD × 3/16" ID × 1/16" | Snug sealing fit |
| 5/8" OD × 1/4" ID × 1/16" | Clearance fit |
| 3/4" OD × 1/4" ID × 1/8" | Clearance, more compression |
| 1" OD × 1/4" ID × 1/8" | Maximum coverage |
Browse all 3/16" ID and 1/4" ID rubber washers.
Sizing note
Choose 3/16" ID when the washer must grip the bolt shank and stay put during assembly; choose 1/4" ID when it needs to slide freely. Under torque both seal identically — rubber conforms.
More metric bolts: M4 · M6 · M8 · M10 · M12 · M16 · M20 — or see the metric conversion guide, Size Finder and size chart.
FAQ
What size rubber washer fits an M5 bolt?
Use a 3/16" (4.76 mm) ID for a snug stretch-on fit or a 1/4" (6.35 mm) ID for a clearance fit on a 5 mm M5 bolt.
Will a 3/16" ID washer really fit over a 5 mm bolt?
Yes — rubber stretches. The 0.24 mm interference makes it grip the shank, which is often desirable for overhead or blind assembly.