An M16 bolt is 16.00 mm (0.630") in diameter. The nearest stocked ID is 5/8" (15.88 mm) — 0.12 mm under, a near-exact stretch-on fit; 3/4" (19.05 mm) gives a clearance fit. All sizes ship in seven rubber materials.
Best in-stock matches for M16
| Washer size | Fit |
|---|---|
| 1-1/4" OD × 5/8" ID × 1/16" | Snug, compact |
| 1-1/2" OD × 5/8" ID × 1/8" | Snug, wider face |
| 2" OD × 5/8" ID × 1/8" | Fender-style |
| 2-1/2" OD × 5/8" ID × 3/16" | Heavy coverage & compression |
Browse all 5/8" ID and 3/4" ID rubber washers.
Sizing note
At M16 scale, joints are usually flanges, tanks, equipment feet or structural pass-throughs — 3/16" and thicker washers absorb more surface irregularity and vibration. The 5/8" ID's 0.12 mm interference is within cutting tolerance: treat it as an exact match.
More metric bolts: M4 · M5 · M6 · M8 · M10 · M12 · M20 — or see the metric conversion guide, Size Finder and size chart.
FAQ
What size rubber washer fits an M16 bolt?
A 5/8" (15.88 mm) ID rubber washer is a near-exact match for a 16 mm M16 bolt; a 3/4" ID gives a clearance fit.
What OD works for M16 flange sealing?
2" to 2-1/2" OD covers typical M16 flange seats; go larger when bridging oversized or slotted holes.