Earnest Technical Library
Technical Library Online Catalog

DIMENSIONS FOR HEX, JAM AND SLOTTED NUTS

(refer to ASME/ANSI B18.2.2 for full requirements)


Finished Full Hex Nut


Finished Hex Jam Nut


Slotted Hex Nut




Part 1 of 2
Nominal
Diameter		 F Width
Across Flats		 H Thickness
(Full Nut)		 J Jam Nut
Thickness		 G Width
Across Corners
F H J G
1/4 .438/.428 .226/.212 .164/.150 .505/.488
5/16 .500/.489 .273/.258 .195/.180 .577/.557
3/8 .562/.551 .337/.320 .227/.210 .650/.628
7/16 .688/.675 .385/.365 .260/.240 .794/.768
1/2 .750/.736 .448/.427 .323/.302 .866/.840
9/16 .875/.861 .496/.473 .324/.301 1.010/.982
5/8 .938/.922 .559/.535 .387/.363 1.083/1.051
3/4 1.125/1.088 .665/.617 .446/.398 1.299/1.240
7/8 1.312/1.269 .776/.724 .510/.458 1.516/1.447
1 1.500/1.450 .887/.831 .575/.519 1.732/1.653
1 1/8 1.688/1.631 .999/.939 .639/.579 1.949/1.859
1 1/4 1.875/1.812 1.094/1.030 .751/.687 2.165/2.066
1 3/8 2.062/1.994 1.206/1.138 .815/.747 2.382/2.273
1 1/2 2.250/2.175 1.317/1.245 .880/.808 2.598/2.480
1 5/8 2.438/2.356 1.444/1.353 .945/.868 2.815/2.686
1 3/4 2.625/2.538 1.540/1.460 1.009/.929 3.031/2.893
1 7/8 2.812/2.718 1.667/1.567 1.073/.989 3.248/3.100
2 3.000/2.900 1.763/1.675 1.138/1.050 3.464/3.306
2 1/4 3.375/3.262 1.986/1.890 1.267/1.155 3.897/3.719
2 1/2 3.750/3.625 2.209/2.104 1.505/1.292 4.330/4.133
2 3/4 4.125/3.988 2.431/2.319 1.634/1.413 4.763/4.546
3 4.500/4.350 2.685/2.534 1.763/1.534 5.196/4.959


Part 2 of 2
Nominal
Diameter		 Bearing
Surface Diameter		 Counter-sink
Diameter		 * T.I.R ** T.I.R T Unslotted
Thickness		 S Slot
Width


* ** T S
1/4 .438/.407 .280 .015 .010 .14/.12 .10/.07
5/16 .500/.465 .342 .016 .011 .18/.16 .12/.09
3/8 .562/.523 .405 .017 .012 .21/.19 .15/.12
7/16 .688/.641 .472 .018 .013 .23/.21 .15/.12
1/2 .750/.699 .540 .019 .014 .29/.27 .18/.15
9/16 .875/.818 .607 .020 .015 .31/.29 .18/.15
5/8 .938/.876 .675 .021 .016 .34/.32 .24/.18
3/4 1.125/1.034 .810 .023 .018 .40/.38 .24/.18
7/8 1.312/1.206 .945 .025 .020 .52/.49 .24/.18
1 1.500/1.377 1.080 .027 .022 .59/.56 .30/.24
1 1/8 1.688/1.549 1.215 .030 .025 .64/.61 .33/.24
1 1/4 1.875/1.721 1.350 .033 .028 .70/.67 .40/.31
1 3/8 2.060/1.894 1.485 .036 .031 .82/.78 .40/.31
1 1/2 2.250/2.066 1.620 .039 .034 .86/.82 .46/.37
1 5/8 2.473/2.238 1.755 .043 .038 .97/.93 .46/.37
1 3/4 2.625/2.411 1.890 .046 .041 1.02/.98 .52/.43
1 7/8 2.812/2.582 2.025 .049 .044 1.07/1.03 .52/.43
2 3.000/2.755 2.160 .052 .047 1.19/1.14 .52/.43
2 1/4 3.375/3.099 2.430 .059 .054 1.39/1.34 .52/.43
2 1/2 3.750/3.444 2.700 .065 .061 1.48/1.43 .64/.55
2 3/4 4.125/3.789 2.970 .072 .067 1.70/1.64 .64/.55
3 4.500/4.132 3.240 .078 .073 1.89/1.83 .71/.62

Part 1 of 3
Size Width
Across Flats		 Finished
Full Nuts		 Finished Jam Nut Thick Nut
Thickness Thickness Thickness
1/4 7/16 7/32 5/32 9/32
5/16 1/2 17/64 3/16 21/64
3/8 9/16 21/64 7/32 13/32
7/16 11/16 3/8 1/4 29/64
1/2 3/4 7/16 5/16 9/16
9/16 7/8 31/64 5/16 39/64
5/8 15/16 35/64 3/8 23/32
3/4 1 1/8 41/64 27/64 13/16
7/8 1 5/16 3/4 31/64 29/32
1 1 1/2 55/64 35/64 1
1 1/8 1 11/16 31/32 39/64 1 5/32
1 1/4 1 7/8 1 1/16 23/32 1 1/4
1 3/8 2 1/16 1 11/64 25/32 1 3/8
1 1/2 2 1/4 1 9/32 27/32 1 1/2
1 5/8 2 7/16 1 25/64 29/32 -
1 3/4 2 5/8 1 1/2 31/32 -
1 7/8 2 3/4 1 3/4 1 1/32 -
2 3 1 23/32 1 3/32 -
2 1/4 3 3/8 1 59/64 1 13/64 -
2 1/2 3 3/4 2 9/64 1 29/64 -
2 3/4 4 1/8 2 23/64 1 37/64 -
3 4 1/2 2 37/64 1 45/64 -

Part 2 of 3
Size Width
Across Flats		 Heavy
Hex Nut		 Heavy
Hex Jam
Thickness
1/4 1/2 15/64 11/64
5/16 9/16 19/64 13/64
3/8 11/16 23/64 15/64
7/16 3/4 27/64 17/64
1/2 7/8 31/64 19/64
9/16 15/16 35/64 21/64
5/8 1 1/16 39/64 23/64
3/4 1 1/4 47/64 27/64
7/8 1 7/16 55/64 31/64
1 1 5/8 63/64 35/64
1 1/8 1 13/16 1 7/64 39/64
1 1/4 2 1 7/32 23/32
1 3/8 2 3/16 1 11/32 25/32
1 1/2 2 3/8 1 15/32 27/32
1 5/8 2 9/16 1 19/32 29/32
1 3/4 2 3/4 1 23/32 31/32
1 7/8 2 15/16 1 27/32 1 1/32
2 3 1/8 1 31/32 1 3/32
2 1/4 3 1/2 2 13/64 1 13/64
2 1/2 3 7/8 2 29/64 1 29/64
2 3/4 4 1/4 2 45/64 1 37/64
3 4 5/8 2 61/64 1 45/64
3 1/4
3 3/16 1 13/16
3 1/2 3/8 3 7/16 1 15/16
3 3/4 3/4 3 11/16 2 1/16
4 6 1/8 3 15/16 2 3/16

Part 3 of 3
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Size TPI Minor Dia (2B)
Min Max
1/4 20 .196 .207
28 .211 .220
5/16 18 .252 .265
24 .267 .277
3/8 16 .307 .321
24 .330 .340
7/16 14 .360 .376
20 .383 .395
1/2 13 .417 .434
20 .446 .457
9/16 12 .472 .490
18 .502 .515
5/8 11 .527 .546
18 .565 .578
3/4 10 .642 .663
16 .682 .696
7/8 9 .755 .778
14 .798 .813
1 8 .865 .890
14 .923 .938
1 1/8 7 .970 .998
12 1.035 1.053
1 1/4 7 1.095 1.123
12 1.160 1.178
1 3/8 6 1.195 1.225
12 1.285 1.303
1 1/2 6 1.320 1.350
12 1.410 1.428
1 3/4 5 1.533 1.567
12 1.660 1.678
2 4 1/2 1.759 1.795
12 1.910 1.928
2 1/4 4 1/2 2.009 2.045
12 2.160 2.178
2 1/2 4 2.229 2.267
12 2.410 2.428
2 3/4 4 2.479 2.517
12 2.660 2.678
3 4 2.729 2.767
12 2.910 2.928
3 1/2 4 3.229 3.267
12 3.410 3.428


HEAVY HEX, JAM AND SLOTTED NUTS

Nominal Diameter Width
Across Flats		 Thickness Jam Nut
Thickness		 Width
Across Corners
F H J G
1/4 .500/.488 .250/.218 .188/.156 .577/.556
5/16 .562/.546 .314/.280 .220/.186 .650/.622
3/8 .688/.669 .377/.341 .252/.216 .794/.763
7/16 .750/.728 .441/.403 .285/.247 .866/.830
1/2 .875/.850 .504/.464 .317/.277 1.010/.969
9/16 .938/.909 .568/.526 .349/.307 1.083/1.037
5/8 1.062/1.031 .631/.587 .381/.337 1.227/1.175
3/4 1.250/1.212 .758/.710 .446/.398 1.443/1.382
7/8 1.438/1.394 .885/.833 .510/.458 1.660/1.589
1 1.625/1.575 1.012/.956 .575/.519 1.876/1.796
1 1/8 1.812/1.756 1.139/1.079 .639/.579 2.093/2.002
1 1/4 2.000/1.938 1.251/1.187 .751/.687 2.309/2.209
1 3/8 2.188/2.119 1.378/1.310 .815/.747 2.526/2.416
1 1/2 2.375/2.300 1.505/1.443 .880/.808 2.742/2.626
1 5/8 2.562/2.481 1.632/1.556 .944/.868 2.481/2.959
1 3/4 2.750/2.662 1.759/1.679 1.009/.929 3.175/3.035
1 7/8 2.938/2.844 1.886/1.802 1.073/.989 3.392/3.242
2 3.125/3.025 2.013/1.925 1.138/1.050 3.608/3.449
2 1/4 3.500/3.388 2.251/2.155 1.251/1.155 4.041/3.862
2 1/2 3.875/3.750 2.505/2.401 1.505/1.401 4.474/4.275
2 3/4 4.250/4.112 2.759/2.647 1.634/1.522 4.907/4.688
3 4.625/4.475 3.013/2.893 1.763/1.643 5.340/5.102
3 1/4 5.000/4.838 3.252/3.124 1.876/1.748 5.774/5.515
3 1/2 5.375/5.200 3.506/3.370 2.006/1.870 6.207/5.928
3 3/4 5.750/5.562 3.760/3.616 2.134/1.990 6.640/6.341
4 6.125/5.925 4.014/3.862 2.264/2.112 7.073/6.755
4 1/4 6.500/6.283 4.268/4.108 2.393/2.233 7.506/7.168
4 1/2 6.875/6.650 4.522/4.354 2.522/2.354 7.939/7.581
4 3/4 7.250/7.012 4.776/4.600 2.651/2.475 8.372/7.994
5 7.625/7.375 5.030/4.846 2.780/2.596 8.805/8.408
5 1/4 8.000/7.738 5.284/5.092 2.909/2.717 9.238/8.821
5 1/2 8.375/8.100 5.538/5.338 3.083/2.838 9.671/9.234
5 3/4 8.750/8.462 5.792/5.584 3.167/2.959 10.104/9.647
6 9.125/8.825 6.046/5.830 3.296/3.080 10.537/10.060