Compatible Hardware for A449 Bolts

Nuts

The recommended nut grades for A449 are shown in the table below. The A563B nut recommended for smaller diameters is not readily available off the shelf and is commonly substituted for either A563A or A194-2H. The A449 specification allows for alternate nut grades as long as the proof load stresses are greater than the specified suitable nuts. Most commonly, A449 bolts are provided with A194-2H or A563-DH heavy hex nuts. These two nut grades are high strength and undergo a heat-treating process to develop their mechanical properties. The reason these two nut grades are primarily used with A449 is because they are the most readily available nut grades in the marketplace.

Nuts Washers
Plain Galvanized
1/4 – 1-1/2 1-5/8 – 3 1/4 – 3
A563B Hex A563A Heavy Hex A563DH Heavy Hex F436
Note: Nuts of other grades having proof load stresses greater than the specified grade are suitable. The ASTM A563 Nut Compatibility Chart has a complete list of specifications.
Click table to show drawingHeavy Hex Nut
Bolt Diam. F C H Weight
(lbs.)
Width Across Flats Width Across Corners Thickness
Basic Max Min Max Min Basic Max Min
1⁄2 7⁄8 0.875 0.850 1.010 0.969 31⁄64 0.504 0.464 0.07
5⁄8 11⁄16 1.062 1.031 1.227 1.175 39⁄64 0.631 0.587 0.12
3⁄4 11⁄4 1.250 1.212 1.443 1.382 47⁄64 0.758 0.710 0.20
7⁄8 17⁄16 1.438 1.394 1.660 1.589 55⁄64 0.885 0.833 0.30
1 15⁄8 1.625 1.575 1.876 1.796 63⁄64 1.012 0.956 0.43
11⁄8 113⁄16 1.812 1.756 2.093 2.002 17⁄64 1.139 1.079 0.59
11⁄4 2 2.000 1.938 2.309 2.209 17⁄32 1.251 1.187 0.79
13⁄8 23⁄16 2.188 2.119 2.526 2.416 111⁄32 1.378 1.310 1.02
11⁄2 23⁄8 2.375 2.300 2.742 2.622 115⁄32 1.505 1.433 1.31
15⁄8 29⁄16 2.562 2.481 2.959 2.828 119⁄32 1.632 1.556 1.62
13⁄4 23⁄4 2.750 2.662 3.175 3.035 123⁄32 1.759 1.679 2.04
17⁄8 215⁄16 2.938 2.844 3.392 3.242 127⁄32 1.886 1.802 2.41
2 31⁄8 3.125 3.025 3.608 3.449 131⁄32 2.013 1.925 2.99
21⁄4 31⁄2 3.500 3.388 4.041 3.862 213⁄64 2.251 2.155 4.19
21⁄2 37⁄8 3.875 3.750 4.474 4.275 229⁄64 2.505 2.401 5.64
23⁄4 41⁄4 4.250 4.112 4.907 4.688 245⁄64 2.759 2.647 7.38
3 45⁄8 4.625 4.475 5.340 5.102 261⁄64 3.013 2.893 9.50
31⁄4 5 5.000 4.838 5.774 5.515 33⁄16 3.252 3.124 11.94
31⁄2 53⁄8 5.375 5.200 6.207 5.928 37⁄16 3.506 3.370 15.26
33⁄4 53⁄4 5.750 5.562 6.640 6.341 311⁄16 3.760 3.616 18.12
4 61⁄8 6.125 5.925 7.073 6.755 315⁄16 4.014 3.862 21.80

Dimensions per ASME B18.2.2 1987 (1999)

Washers

The recommended washer for A449 bolts is ASTM F436. This is a hardened washer that has undergone a heat-treating process. The F436 washers have a smaller outside diameter than typical flat washers. 

Click table to show drawingWasher
Bolt Size B A C Weight (lbs.) Per 1000 Pieces Part Numbers
Outside Diameter Inside Diameter Thickness Domestic
Min Max Plain Galvanized
1⁄2 11⁄16 17⁄32 0.097 0.177 18 16440 16441
5⁄8 15⁄16 11⁄16 0.122 0.177 33 16442 16443
3⁄4 115⁄32 13⁄16 0.122 0.177 41 16444 16445
7⁄8 13⁄4 15⁄16 0.136 0.177 64 16446 16447
1 2 11⁄16 0.136 0.177 82 16448 16449
11⁄8 21⁄4 13⁄16 0.136 0.177 105 16450 16451
11⁄4 21⁄2 13⁄8 0.136 0.177 133 16452 16453
13⁄8 23⁄4 11⁄2 0.136 0.177 163 16454 16455
11⁄2 3 15⁄8 0.136 0.177 200 16456 16457
15⁄8 31⁄4 13⁄4 0.178 0.28 320 19481* 19482*
13⁄4 33⁄8 17⁄8 0.178 0.28 307 16458 16459
17⁄8 31⁄2 2 0.178 0.28 360 16471* 16472
2 33⁄4 21⁄8 0.178 0.28 380 16460 16461
21⁄4 4 23⁄8 0.24 0.34 560 16462 16463
21⁄2 41⁄2 25⁄8 0.24 0.34 720 16464 16465
23⁄4 5 27⁄8 0.24 0.34 920 16611 16612
3 51⁄2 31⁄8 0.24 0.34 1040 16613 16614
31⁄4 6 33⁄8 0.24 0.34 1350 – –
31⁄2 61⁄2 35⁄8 0.24 0.34 1633 18490 18460
33⁄4 7 37⁄8 0.24 0.34 1880 – –
4 71⁄2 41⁄8 0.24 0.34 2200 18461 18462
Dimensions per ASTM F436
*Usually domestic