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| SAE Bolts, Nuts & Washers |
This table presents the most commonly used small to medium size varieties of SAE hardware. There are two general types of SAE bolts (sometimes referred to as machine screws). UNF (fine thread pitch) has more threads per inch than the same diameter bolt in the UNC (coarse thread pitch). Nut dimensions are maximums per SAE. 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 SAE/ANSI values.
Note: For critical applications, consult official SAE/ANSI manuals to obtain dimensions.
Click here for a table of metric hardware sizes.
Size -
Threads
/Inch | Series | Tap
Drill | Clearance Drill | Nut
Points | Nut
Flats | Washer
I.D. | Washer
O.D. | | Decimal (inches) | Number | | 0-80 | UNF | 0.046 | 0.070 | 50 | 0.180 | 0.156 | 0.068 | 0.188 | | 1-64 | UNC | 0.056 | 0.081 | 46 | 0.180 | 0.156 | 0.084 | 0.219 | | 1-72 | UNF | 0.058 | 0.081 | 46 | 0.180 | 0.156 | 0.084 | 0.219 | | 2-56 | UNC | 0.067 | 0.096 | 41 | 0.217 | 0.187 | 0.094 | 0.250 | | 2-64 | UNF | 0.069 | 0.096 | 41 | 0.217 | 0.187 | 0.094 | 0.250 | | 3-48 | UNC | 0.076 | 0.110 | 35 | 0.217 | 0.187 | 0.109 | 0.312 | | 3-56 | UNF | 0.080 | 0.110 | 35 | 0.217 | 0.187 | 0.109 | 0.312 | | 4-40 | UNC | 0.085 | 0.129 | 30 | 0.289 | 0.250 | 0.125 | 0.375 | | 4-48 | UNF | 0.089 | 0.129 | 30 | 0.289 | 0.250 | 0.125 | 0.375 | | 5-40 | UNC | 0.098 | 0.136 | 29 | 0.289 | 0.250 | 0.141 | 0.406 | | 5-44 | UNF | 0.100 | 0.136 | 29 | 0.289 | 0.250 | 0.141 | 0.406 | | 6-32 | UNC | 0.104 | 0.150 | 25 | 0.361 | 0.312 | 0.156 | 0.438 | | 6-40 | UNF | 0.111 | 0.150 | 25 | 0.361 | 0.312 | 0.156 | 0.438 | | 8-32 | UNC | 0.130 | 0.177 | 16 | 0.397 | 0.344 | 0.188 | 0.500 | | 8-36 | UNF | 0.134 | 0.177 | 16 | 0.397 | 0.344 | 0.188 | 0.500 | | 10-24 | UNC | 0.145 | 0.201 | 7 | 0.433 | 0.375 | 0.203 | 0.562 | | 10-32 | UNF | 0.156 | 0.201 | 7 | 0.433 | 0.375 | 0.203 | 0.562 | | 12-24 | UNC | 0.171 | 0.228 | 1 | 0.433 | 0.438 | 0.234 | 0.625 | | 12-28 | UNF | 0.177 | 0.228 | 1 | 0.433 | 0.438 | 0.234 | 0.625 | | 1/4-20 | UNC | 0.196 | 0.266 | H | 0.505 | 0.438 | 0.281 | 0.734 | | 1/4-28 | UNF | 0.211 | 0.266 | H | 0.505 | 0.438 | 0.281 | 0.734 | | 5/16-18 | UNC | 0.252 | 0.332 | Q | 0.577 | 0.500 | 0.344 | 0.875 | | 5/16-24 | UNF | 0.267 | 0.332 | Q | 0.577 | 0.500 | 0.344 | 0.875 | | 3/8-16 | UNC | 0.307 | 0.397 | X | 0.650 | 0.562 | 0.406 | 1.000 | | 3/8-24 | UNF | 0.330 | 0.397 | X | 0.650 | 0.562 | 0.406 | 1.000 | | 7/16-14 | UNC | 0.360 | 0.469 | 15/32 | 0.794 | 0.688 | 0.469 | 1.125 | | 7/16-20 | UNF | 0.383 | 0.469 | 15/32 | 0.794 | 0.688 | 0.469 | 1.125 | | 1/2-13 | UNC | 0.417 | 0.531 | 17/32 | 0.866 | 0.750 | 0.531 | 1.250 | | 1/2-20 | UNF | 0.446 | 0.531 | 17/32 | 0.866 | 0.750 | 0.531 | 1.250 | | 9/16-12 | UNC | 0.472 | 0.594 | 19/32 | 1.010 | 0.875 | 0.594 | 1.469 | | 9/16-18 | UNF | 0.502 | 0.594 | 19/32 | 1.010 | 0.875 | 0.594 | 1.469 | | 5/8-11 | UNC | 0.527 | 0.656 | 21/32 | 1.083 | 0.938 | 0.656 | 1.750 | | 5/8-18 | UNF | 0.565 | 0.656 | 21/32 | 1.083 | 0.938 | 0.656 | 1.750 | | 3/4-10 | UNC | 0.642 | 0.781 | 25/32 | 1.299 | 1.125 | 0.812 | 2.000 | | 3/4-16 | UNF | 0.682 | 0.781 | 25/32 | 1.299 | 1.125 | 0.812 | 2.000 | | 7/8-9 | UNC | 0.755 | 0.906 | 29/32 | 1.516 | 1.312 | 0.938 | 2.250 | | 7/8-14 | UNF | 0.798 | 0.906 | 29/32 | 1.516 | 1.312 | 0.938 | 2.250 | | 1-8 | UNC | 0.865 | 1.031 | 1 1/32 | 1.732 | 1.500 | 1.062 | 2.500 | | 1-12 | UNF | 0.910 | 1.031 | 1 1/32 | 1.732 | 1.500 | 1.062 | 2.500 | | 1-14 | UN | | 1.031 | 1 1/32 | 1.732 | 1.500 | 1.062 | 2.500 | | 1 1/8-7 | UNC | 0.970 | 1.156 | 1 5/32 | 1.949 | 1.688 | 1.188 | 2.750 | | 1 1/8-8 | UN | | 1.156 | 1 5/32 | 1.949 | 1.688 | 1.188 | 2.750 | | 1 1/8-12 | UNF | 1.035 | 1.156 | 1 5/32 | 1.949 | 1.688 | 1.188 | 2.750 | | 1 1/4-7 | UNC | 1.095 | 1.281 | 1 9/32 | 2.165 | 1.875 | 1.310 | 3.000 | | 1 1/4-8 | UN | | 1.281 | 1 9/32 | 2.165 | 1.875 | 1.310 | 3.000 | | 1 1/4-12 | UNF | 1.160 | 1.281 | 1 9/32 | 2.165 | 1.875 | 1.310 | 3.000 | | 1 3/8-6 | UNC | 1.195 | 1.406 | 1 13/32 | 2.382 | 2.062 | 1.438 | 3.250 | | 1 3/8-8 | UN | | 1.406 | 1 13/32 | 2.382 | 2.062 | 1.438 | 3.250 | | 1 3/8-12 | UNF | 1.285 | 1.406 | 1 13/32 | 2.382 | 2.062 | 1.438 | 3.250 | | 1 1/2-6 | UNC | 1.320 | 1.531 | 1 17/32 | 2.598 | 2.250 | 1.562 | 3.500 | | 1 1/2-8 | UN | | 1.531 | 1 17/32 | 2.598 | 2.250 | 1.562 | 3.500 | | 1 1/2-12 | UNC | 1.410 | 1.531 | 1 17/32 | 2.598 | 2.250 | 1.562 | 3.500 | | 1 5/8-8 | UN | | 1.656 | 1 21/32 | 2.815 | 2.438 | 1.750 | 3.750 | | 1 3/4-5 | UNC | 1.534 | 1.781 | 1 25/32 | 3.031 | 2.625 | 1.875 | 4.000 | | 1 3/4-8 | UN | | 1.781 | 1 25/32 | 3.031 | 2.625 | 1.875 | 4.000 | 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) 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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Kirt
