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| Metric Bolts, Nuts & Washers |
This table presents the most commonly used varieties of small to medium size metric hardware. Nut dimensions are maximums per ISO. Washer dimensions are for the regular size (vs. narrow or wide). All dimensions are in inches. Be aware that a search for hardware dimensions will yield variable results since many reported dimensions are manufacturers' production values, not necessarily the official ISO values.
Note: For critical applications, consult official ISO manuals to obtain dimensions.
Click here for a table of SAE hardware sizes.
All sizes are millimeters (mm).
| Screw Size | Tap
Drill Size | Clearance
Drill Size | Nut
Points | Nut
Flats | Washer
I.D. | Washer
O.D. | | Diameter | Pitch | Series | | 1 | 0.20 | Fine | 0.80 | 1.20 | 2.08 | 1.80 | 1.0 | 2.0 | | 0.25 | Coarse | 0.75 | | 1.1 | 0.20 | Fine | 0.90 | 1.30 | | | | | | 0.25 | Coarse | 0.85 | | 1.2 | 0.20 | Fine | 1.00 | 1.50 | | | | | | 0.25 | Coarse | 0.95 | | 1.4 | 0.20 | Fine | 1.20 | 1.70 | | | | | | 0.30 | Coarse | 1.10 | | 1.6 | 0.20 | Fine | 1.40 | 2.00 | 3.70 | 3.2 | 1.7 | 4.0 | | 0.35 | Coarse | 1.25 | | 1.8 | 0.20 | Fine | 1.60 | 2.20 | | | | | | 0.35 | Coarse | 1.45 | | 2 | 0.25 | Fine | 1.75 | 2.60 | 4.62 | 4.0 | 2.2 | 5.0 | | 0.40 | Coarse | 1.60 | | 2.2 | 0.25 | Fine | 1.95 | 2.80 | | | | | | 0.45 | Coarse | 1.75 | | 2.5 | 0.35 | Fine | 2.15 | 3.10 | 5.77 | 5.0 | 2.7 | 6.0 | | 0.45 | Coarse | 2.05 | | 3 | 0.35 | Fine | 2.65 | 3.60 | 6.35 | 5.5 | 3.2 | 7.0 | | 0.50 | Coarse | 2.50 | | 3.5 | 0.35 | Fine | 3.15 | 4.20 | 6.93 | 6.0 | 3.7 | 8.0 | | 0.60 | Coarse | 2.90 | | 4 | 0.50 | Fine | 3.50 | 4.80 | 8.08 | 7.0 | 4.3 | 9.0 | | 0.70 | Coarse | 3.30 | | 4.5 | 0.50 | Fine | 4.00 | 5.30 | | | | | | 0.75 | Coarse | 3.70 | | 5 | 0.50 | Fine | 4.50 | 5.80 | 9.24 | 8.0 | 5.3 | 10 | | 0.80 | Coarse | 4.20 | | 6 | 0.75 | Fine | 5.25 | 7.00 | 11.5 | 10 | 6.4 | 12 | | 1.00 | Coarse | 5.00 | | 7 | 0.75 | Fine | 6.25 | 8.00 | | | | | | 1.00 | Coarse | 6.00 | | 8 | 0.75 | Fine | 7.25 | 10.00 | 15.0 | 13 | 8.4 | 16 | | 1.00 | Fine | 7.50 | | 1.25 | Coarse | 6.80 | | 9 | 0.75 | Fine | 8.25 | 10.50 | | | | | | 1.00 | Fine | 8.00 | | 1.25 | Coarse | 7.80 | | 10 | 0.75 | Fine | 9.25 | 12.00 | 17.3 | 15 | 10.5 | 20 | | 1.00 | Fine | 9.00 | | 1.25 | Fine | 8.80 | | 1.50 | Coarse | 8.50 | | 11 | 0.75 | Fine | 10.25 | 13.00 | | | | | | 1.00 | Fine | 10.00 | | 1.50 | Coarse | 9.50 | | 12 | 1.00 | Fine | 11.00 | 15.00 | | | | | | 1.25 | Fine | 10.75 | | 1.50 | Fine | 10.50 | | 1.75 | Coarse | 10.20 | | 14 | 1.00 | Fine | 13.00 | 17.00 | | | | | | 1.25 | Fine | 12.80 | | 1.50 | Fine | 12.50 | | 2.00 | Coarse | 12.00 | | 15 | 1.00 | Fine | 14.00 | 18.00 | | | | | | 1.50 | Fine | 13.50 | | 16 | 1.00 | Fine | 15.00 | 19.00 | | | | | | 1.50 | Fine | 14.50 | | 2.00 | Coarse | 14.00 | | 17 | 1.00 | Fine | 16.00 | 20.00 | | | | | | 1.50 | Fine | 15.50 | | 18 | 1.00 | Fine | 17.00 | 21.00 | | | | | | 1.50 | Fine | 16.50 | | 2.00 | Fine | 16.00 | | 2.50 | Coarse | 15.50 | | 20 | 1.00 | Fine | 19.00 | 24.00 | | | | | | 1.50 | Fine | 18.50 | | 2.00 | Fine | 18.00 | | 2.50 | Coarse | 17.50 | | 22 | 1.00 | Fine | 21.00 | 26.00 | | | | | | 1.50 | Fine | 20.50 | | 2.00 | Fine | 20.00 | | 2.50 | Coarse | 19.50 | | 24 | 1.00 | Fine | 23.00 | 28.00 | | | | | | 1.50 | Fine | 22.50 | | 2.00 | Fine | 22.00 | | 3.00 | Coarse | 21.00 | | 25 | 1.00 | Fine | 24.00 | 30.00 | | | | | | 1.50 | Fine | 23.50 | | 2.00 | Fine | 23.00 | | 26 | 1.50 | Fine | 24.50 |
| | | | | | 27 | 1.00 | Fine | 26.00 | 32.00 | | | | | | 1.50 | Fine | 25.50 | | 2.00 | Fine | 25.00 | | 3.00 | Coarse | 24.00 | | 28 | 1.00 | Fine | 27.00 |
| | | | | | 1.50 | Fine | 26.50 | | 2.00 | Fine | 26.00 | | 30 | 1.00 | Fine | 29.00 | 35.00 | | | | | | 1.50 | Fine | 28.50 | | 2.00 | Fine | 28.00 | | 3.00 | Fine | 27.00 | | 3.50 | Coarse | 26.50 | | 32 | 1.50 | Fine | 30.50 |
| | | | | | 2.00 | Fine | 30.00 | | 33 | 1.50 | Fine | 31.50 | 38.00 | | | | | | 2.00 | Fine | 31.00 | | 3.00 | Fine | 30.00 | | 3.50 | Coarse | 29.50 | | 35 | 1.50 | Fine | 33.50 |
| | | | | | 2.00 | Fine | 33.00 | | 36 | 1.50 | Fine | 34.50 | 42.00 | | | | | | 2.00 | Fine | 34.00 | | 3.00 | Fine | 33.00 | | 4.00 | Coarse | 32.00 | | 39 | 1.50 | Fine | 37.50 | 45.00 | | | | | | 2.00 | Fine | 37.00 | | 3.00 | Fine | 36.00 | | 4.00 | Coarse | 35.00 | | 40 | 1.50 | Fine | 38.50 |
| | | | | | 2.00 | Fine | 38.00 | | 3.00 | Fine | 37.00 | | 42 | 1.50 | Fine | 40.50 | 48.00 | | | | | | 2.00 | Fine | 40.00 | | 3.00 | Fine | 39.00 | | 4.00 | Fine | 38.00 | | 4.50 | Coarse | 37.50 | | 45 | 1.50 | Fine | 43.50 | 52.00 | | | | | | 2.00 | Fine | 43.00 | | 3.00 | Fine | 42.00 | | 4.00 | Fine | 41.00 | | 4.50 | Coarse | 40.50 | | 48 | 1.50 | Fine | 46.50 | 56.00 | | | | | | 2.00 | Fine | 46.00 | | 3.00 | Fine | 45.00 | | 4.00 | Fine | 44.00 | | 5.00 | Coarse | 43.00 | | 50 | 1.50 | Fine | 48.50 |
| | | | | | 2.00 | Fine | 48.00 | | 3.00 | Fine | 47.00 | | 52 | 1.50 | Fine | 50.50 | 62.00 | | | | | | 2.00 | Fine | 50.00 | | 3.00 | Fine | 49.00 | | 4.00 | Fine | 48.00 | | 5.00 | Coarse | 47.00 | | 55 | 1.50 | Fine | 53.50 |
| | | | | | 2.00 | Fine | 53.00 | | 3.00 | Fine | 52.00 | | 4.00 | Fine | 51.00 | | 56 | 1.50 | Fine | 54.50 | 66.00 | | | | | | 2.00 | Fine | 54.00 | | 3.00 | Fine | 53.00 | | 4.00 | Fine | 52.00 | | 5.50 | Coarse | 50.50 |
1) See Drill Sizes page for cross reference.
2) Nut Points is the distance between opposite corners of hex nuts.
3) Nut Flats is the distance between opposite sides of hex nuts. |
Webmaster: Kirt Blattenberger, BSEE, UVM 1989
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