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| Hex Jam Nuts |
| Nominal Size or Basic Major Thread Diameter |
F | G | H | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Width Across Flats |
Width Across Corners |
Thickness | |||||||
| Basic | Max | Min | Max | Min | Basic | Max | Min | ||
| 1/4 | .2500 | 7/16 | .438 | .428 | .505 | .488 | 5/32 | .163 | .150 |
| 5/16 | .3125 | 1/2 | .500 | .489 | .577 | .557 | 3/16 | .195 | .180 |
| 3/8 | .3750 | 9/16 | .562 | .551 | .650 | .628 | 7/32 | .227 | .210 |
| 7/16 | .4375 | 11/16 | .688 | .675 | .794 | .768 | 1/4 | .260 | .240 |
| 1/2 | .5000 | 3/4 | .750 | .736 | .866 | .840 | 5/16 | .323 | .302 |
| 9/16 | .5625 | 7/8 | .875 | .851 | 1.010 | .982 | 5/16 | .324 | .301 |
| 5/8 | .6250 | 15/16 | .938 | .922 | 1.093 | 1.051 | 3/8 | .387 | .363 |
| 3/4 | .7500 | 1-1/8 | 1.125 | 1.088 | 1.299 | 1.240 | 27/64 | .446 | .398 |
| 7/8 | .8750 | 1-5/16 | 1.312 | 1.269 | 1.516 | 1.447 | 31/64 | .510 | .458 |
| 1 | 1.0000 | 1-1/2 | 1.500 | 1.450 | 1.732 | 1.653 | 35/64 | .575 | .519 |
| 1-1/8 | 1.1250 | 1-11/16 | 1.688 | 1.631 | 1.949 | 1.859 | 39/64 | .639 | .579 |
| 1-1/4 | 1.2500 | 1/7/8 | 1.875 | 1.812 | 2.165 | 2.066 | 23/32 | .751 | .687 |
| 1-3/8 | 1.3750 | 2-1/16 | 2.062 | 1.994 | 2.382 | 2.273 | 25/32 | .815 | .747 |
| 1-1/2 | 1.5000 | 2-1/4 | 2.250 | 2.175 | 2.598 | 2.480 | 27/32 | .880 | .808 |
| 1-3/4 | 1.7500 | 2-5/8 | 2.625 | 2.538 | 3.031 | 2.893 | 31/32 | 1.009 | .929 |
| 2 | 2.0000 | 3 | 3.000 | 2.900 | 3.464 | 3.306 | 1-3/32 | 1.138 | 1.050 |
| 2-1/4 | 2.2500 | 3-1/2 | 3.500 | 3.388 | 4.041 | 3.862 | 1-13/64 | 1.251 | 1.155 |
| 2-1/2 | 2.5000 | 3-7/8 | 3.875 | 3.750 | 4.474 | 4.275 | 1-29/64 | 1.505 | 1.401 |
| Description | A six sided internally threaded fastener which is only 2/3 he thickness of a full form nut. |
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| Applications & Advantages |
Jam nuts are tightened against the work surface and a finished or heavy hex nut is tightened against the jam nut to keep it from loosening. |
| Material | Steel: Nuts shall be made from a low carbon steel which conforms to the following chemical composition requirements: Phosphorus: .12% max Carbon: .47% max Sulfur: .23% max Stainless: Nuts shall be made from one of the following austenitic stainless alloys" 303, 303SE, 304 or XM7, all of which have a chromium content of 18% and a nickel content of 8%. |
| Heat Treatment | The austenitic alloys develop their strength through work hardening during the manufacturing process, as seen from their hardness properties below. The only heat treatment normally available on austenitic stainless steel alloys is annealing, which is done at approximately 1900°F to a dead soft condition and is not normally thermally reversible. |
| Core Hardness | Steel: Rockwell B68 - C32 Stainless: Rockwell B95 - C32 |
| Proof Load | Steel: Course thread: 54,000 psi Fine Thread: 48,000 psi Stainless: 1/4 thru 1/2 inch - 60,000 psi |
| Plating | See plating page for plating information. |
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Smith Fastener Company, A California Corporation - 3613 East Florence Avenue, Bell, California, 90201 - Phone: ( 323 ) 587-0382 - FAX: ( 323 ) 587-8712 - E-mail: sales@smithfast.com - Copyright © 2000 by Smith Fastener Company - Last updated: May 22nd, 2006 - http://www.smithfast.com/hexjamnuts.html |