Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes USAF radar shop Notable Quotes App Notes Calculators Education Engineering Magazines RF Cafe Software,T-Shirts,Coffee Mugs Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Stencils for Visio RF & EE Shapes for Word Advertising RF Cafe Homepage Sudoku puzzles Facebook Test notes Thank you for visiting RF Cafe!
RF Stencils for Visio v3.1

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
/In
ch
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.
Triad RF Systems ConductRF Precision RF Test Cables - RF Cafe
Rigol Technology (test equipment) - RF Cafe Antenna Test Lab - RF Cafe
About RF Cafe
Kirt Blattenberger - RF Cafe Webmaster
Copyright: 1996 - 2018
Webmaster:
    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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:  AirplanesAndRockets.com

spacer