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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

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    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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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

style="text-align:center"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.

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