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SAE Nuts, Bolts, and Washers

Size & Threads/lnch Series
Designation
Tap
Drill
Clearance
Drill
Counter
Bore
Nut
Points
Nut
Flats
Washer
I.D.
Washer
O.D.
0-80 UNF 0.046 0.070 1/8 0.180 0.156 0.078 0.187
1-64 UNC 0.059 0.089 5/32 0.180 0.156 0.099 0.250
1-72 UNF              
2-56 UNC 0.070 0.104 3/16 0.217 0.187 0.099 0.250
2-64 UNF              
3-48 UNC 0.078 0.120 3/16 0.217 0.187 0.105 0.250
3-56 UNF              
4-40 UNC 0.089 0.136 7/32 0.289 0.250 0.125 0.312
4-48 UNF              
5-40 UNC              
5-44 UNF               
6-32 UNC 0.106 0.161 9/32 0.361 0.312 0.149 0.375
6-40 UNF              
8-32 UNC 0.136 0.189 5/16 0.397 0.343 0.174 0.375
8-36 UNF              
10-24 UNC 0.149 0.213 11/32 0.433 0.375 0.203 0.437
10-32 UNF              
12-24 UNC              
12-28 UNF              
1/4-20 UNC 0.201 0.281 7/16 0.505 0.437 0.265 0.500
1/4-28 UNF              
5/16-18 UNC              
5/16-24 UNF              
3/8-16 UNC              
3/8-24 UNF              
7/16-14 UNC              
7/16-20 UNF              
1/2-13 UNC              
1/2-20 UNF              
9/16-12 UNC              
9/16-18
5/8-11
5/8-18
3/4-10
3/4-16
UNF
UNC
UNF
UNC
UNF
 
7/8-9
7/8-14
1-8
1-12
1-14
UNC
UNF
UNC
UNF
UN
11/8-7
11/8-8
11/8-12
11/4-7
1114-8
UNC
UN
UNF
UNC
UN
11/4-12
1 3/8-6
1 3/8-8
1 3/8-12
11/2-6
UNF
UNC
UN
UNF
UNC
1 1/2-8
1 1/2-12
1 5/8-8
1 3/4-5
1 3/4-8
UN
UNC
UN
UNC
UN
1 7/8-8
2-4 1/2
2-8
2 1/4-4.5
2 1/4-8
UN
UNC
UN
UNC
UN
2 1/2-4
2 1/2-8
2 3/4-4
2 3/4-8
3-4
UNC
UN
UNC
UN
UNC
3-8
3 1/4-4
3 1/4-8
3 1/2-4
3 1/2-8
UN
UNC
UN
UNC
UN
3 3/4-4
3 3/4-8
4-4
4-8
UNC
UN
UNC
UN

1) Nut Points is the distance between opposite corners of hex nuts.
2) Nut Flats is the distance between opposite sides of hex nuts.