About Selecting Shock Absorbers
To select the best shock absorber for your application, you need to find the energy capacity your application requires. Use this formula to calculate the energy capacity required to stop a horizontal-moving load. For example, if you have a 250-lb. load moving at 25 inches per second, your calculation is (250 lbs. ÷ 772) × 252 = 202.4 in.-lbs. energy capacity.
Note: Choose a shock absorber with a higher energy capacity than you calculated. Factors such as driving force or an inclined surface will increase the energy capacity required.
Energy Capacity (in.-lbs.) = (Weight, lbs./772) × Velocity2 (in. per second)
About Nuts, Materials, and Finishes
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Medium-Strength Steel Thin Hex Nuts
Also known as jam nuts, these are about half the height of standard hex nuts. Use them in low-clearance applications or jam one against another nut to hold it in place. They're suitable for fastening most machinery and equipment when used in conjunction with a standard hex nut.
Zinc-plated steel nuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
High-Strength Steel Thin Hex Nuts—Grade 8
Also known as jam nuts, these are about half the height of standard hex nuts. Use in low-clearance applications or jam one against a standard hex nut to hold it in place. They're about 25% stronger than medium-strength steel thin hex nuts.
For technical drawings and 3-D models, click on a part number.
| Thread Size  | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Steel—Grade 8 | ||||||
|---|---|---|---|---|---|---|
| 1 3/8"-12 | 2 1/16" | 25/32" | ASME B18.2.2 | 1 | 000000000 | 00000 |
Low-Strength Steel Thin Hex Nuts
Also known as jam nuts, these are about half the height of standard hex nuts. Use them in low-clearance applications or jam one against another nut to hold it in place. About half the strength of medium-strength steel thin nuts, use them for light duty fastening applications, such as securing access panels.
Nuts with fine and extra-fine thread spacing are less likely to loosen from vibration than nuts with coarse thread spacing.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||
|---|---|---|---|---|---|---|
| Size | Spacing | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Steel—Grade 2 | ||||||
| 1 3/8"-12 | Fine | 2 1/16" | 25/32" | 5 | 000000000 | 000000 |
High-Strength Steel Thin Heavy Nylon-Insert Locknuts
About half the height and 10% wider than standard nylon-insert locknuts, these locknuts are often referred to as thin heavy locknuts. Use them in low-clearance applications or jam one against a heavy hex nut to hold it in place. The nylon insert grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power lessens with each use. Comparable in strength to Grade 8 bolts, these locknuts are about three times stronger than the same locknut made with low-strength steel.
Steel locknuts without a finish are ready to be welded, painted, and finished.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Each | |
Steel—ASTM Grade C | |||||
|---|---|---|---|---|---|
| 1 3/8"-12 | 2 13/64" | 1 3/16" | 250° | 000000000 | 000000 |
Steel Thin Flex-Top Locknuts for Heavy Vibration
About two-thirds the height of standard flex-top locknuts, use these in low-clearance applications or jam one against a hex nut to hold it in place. Threads at the top of the nut expand to grip the bolt on all sides for a stronger hold than distorted-thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. These locknuts have equivalent strength to Grade 8 steel locknuts.
Plain steel locknuts are uncoated and ready for painting.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Steel | |||||
|---|---|---|---|---|---|
| 1 3/8"-12 | 1 15/16" | 53/64" | 1 | 000000000 | 000000 |
Mounting Nuts for Shock Absorbers
Use Mounting Blocks for Shock Absorbers (not included) to mount and secure threaded-body shock absorbers.