Loading... Please wait...

Metrics Nuts, Bolts, and Washers

Size Tap
Drill
(mm)
Clearance
Drill
(mm)
Counter
Bore
(mm)
Nut
Points
(mm)
Nut
Flats
(mm)
Washer
I.D.
(mm)
Washer
O.D.
(mm)
M1 0.75 1.10 0.30 2.08 1.8 1.0 2.0
M1.6 1.25 1.85 0.35 3.70 3.2 1.7 3.4
M2 1.60 2.40 0.40 4.62 4.0 2.2 4.5
M2.5 2.05 3.10 0.45 5.77 5.0 2.7 5.5
M3 2.50 3.75 0.50 6.35 5.5 3.2 6.0
M3.5 2.90 4.30 0.60 6.93 6.0 4.0 7.8
M4 3.30 4.90 0.70 8.08 7.0 4.3 8.0
M5 4.20 6.30 0.80 9.24 8.0 5.3 10
M6 5.00 7.50 1.0 11.5 10 6.4 11
M8 6.75 10.0 1.25 15.0 13 8.4 15
M10 8.50 12.5 1.50 17.3 15 11.5 21
1) Nut Points is the distance between opposite corners of hex nuts.
2) Nut Flats is the distance between opposite sides of hex nuts.