System of Measurement System of Measurement |
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Length Length | Show |
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Length Length | Hide |
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Spring Type Spring Type |
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| Compression |
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| Extension |
End Type End Type |
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 | Closed and Ground |
 | Loop |
 | Hook |
 | Elongated Hook |
 | Plain |
Rate Rate |
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Material Material |
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Load Load |
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Extended Length @ Maximum Load Extended Length@ Maximum Load |
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Finish Finish |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Hardness Hardness |
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Color Color |
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 | Black |
Maximum Temperature Maximum Temperature |
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Minimum Temperature Minimum Temperature |
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Breaking Strength Breaking Strength |
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Shaft Type Shaft Type |
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 | Slotted |
Compression Springs
As you squeeze a compression spring, it pushes back to return to its original length. Rate is the amount of force required for every inch of compression or, for metric springs, millimeter of compression. The higher the rate, the harder it is to compress the spring.
Zinc-plated springs have mild corrosion resistance.
Springs with closed and ground ends sit flat, so they won’t buckle.
For technical drawings and 3-D models, click on a part number.
Wire | ||||||||||
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| OD | ID | Dia. | Compressed Lg. @ Max. Load | Max. Load, lbs. | Rate, lbs./in. | Material | End Type | Pkg. Qty. | Pkg. | |
3.75" Lg. | ||||||||||
| 0.812" | 0.543" | 0.135" | 3.09" | 78.66 | 118.37 | Zinc-Plated Spring-Tempered Steel | Closed and Ground | 6 | 00000000 | 000000 |
Flanged Compression Springs
Flanges on the ends of these springs provide a flat mounting surface. Springs are a polyester/rubber blend that is wear, oil, and fuel resistant.
As you squeeze a compression spring, it pushes back to return to its original length. Rate is the amount of force required for every inch of compression. The higher the rate, the harder it is to compress the spring.
For technical drawings and 3-D models, click on a part number.
Flange | ||||||||||||
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| Lg. | OD | ID | OD | Thick. | Compressed Lg. @ Max. Load | Max. Load, lbs. | Rate, lbs./in. | Material | Hardness | Temperature Range, °F | Each | |
| 3.75" | 4.5" | 3" | 5.69" | 0.61" | 2.3" | 1,700 | 910 | Polyester/Rubber Blend | Durometer 55D | -40° to 120° | 0000000 | 000000 |
Extension Springs with Loop Ends
As you stretch an extension spring, it gets harder to pull. Minimum load is the amount of force required to start to extend the spring. Maximum load is the amount of force required to fully extend the spring. Rate is the amount of force required for every inch or millimeter of extension.
Zinc-plated springs have mild corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Load, lbs. | |||||||||
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| OD | Wire Dia. | Extended Lg. @ Max. Load | Min. | Max. | Rate, lbs./in. | Material | Pkg. Qty. | Pkg. | |
3.75" Lg. | |||||||||
| 0.375" | 0.041" | 5.81" | 1.26 | 4.37 | 1.51 | Zinc-Plated Spring-Tempered Steel | 6 | 00000000 | 000000 |
| 0.375" | 0.041" | 8.721" | 1.15 | 8.68 | 1.49 | Spring-Tempered Steel | 6 | 00000000 | 00000 |
| 0.437" | 0.055" | 5.74" | 2.76 | 12.08 | 4.67 | Zinc-Plated Spring-Tempered Steel | 1 | 00000000 | 0000 |
| 0.438" | 0.048" | 6.85" | 1.65 | 8.02 | 2.06 | Zinc-Plated Spring-Tempered Steel | 6 | 00000000 | 0000 |
| 0.5" | 0.055" | 6.49" | 2.1 | 10.61 | 3.1 | Zinc-Plated Spring-Tempered Steel | 1 | 00000000 | 0000 |
| 0.625" | 0.113" | 4.75" | 24.02 | 92.42 | 68.4 | Music-Wire Steel | 1 | 00000000 | 0000 |
| 1" | 0.11" | 5.153" | 8.71 | 33.1 | 17.38 | Music-Wire Steel | 1 | 00000000 | 00000 |
Corrosion-Resistant Extension Springs with Loop Ends
Made of stainless steel, these springs are more corrosion resistant than steel springs. They're also easier to extend than steel springs. As you stretch an extension spring, it gets harder to pull. Minimum load is the amount of force required to start to extend the spring. Maximum load is the amount of force required to fully extend the spring. Rate is the amount of force required for every inch or millimeter of extension.
302 stainless steel springs have good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Load, lbs. | |||||||||
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| OD | Wire Dia. | Extended Lg. @ Max. Load | Min. | Max. | Rate, lbs./in. | Material | Pkg. Qty. | Pkg. | |
3.75" Lg. | |||||||||
| 0.375" | 0.041" | 6.37" | 1.26 | 4.7 | 1.31 | 302 Stainless Steel | 1 | 000000000 | 00000 |
| 0.437" | 0.055" | 5.45" | 2.76 | 10.5 | 4.06 | 302 Stainless Steel | 1 | 00000000 | 0000 |
| 0.5" | 0.055" | 6.18" | 2.1 | 9.25 | 2.7 | 302 Stainless Steel | 1 | 00000000 | 0000 |
| 0.5" | 0.072" | 4.65" | 6.49 | 16.89 | 10.54 | 302 Stainless Steel | 1 | 000000000 | 0000 |
Extension Springs with Hook Ends
As you stretch an extension spring, it gets harder to pull. Minimum load is the amount of force required to start to extend the spring. Maximum load is the amount of force required to fully extend the spring. Rate is the amount of force required for every inch or mm of extension.
Zinc-plated springs have mild corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Corrosion-Resistant Extension Springs with Hook Ends
Made of stainless steel, these springs are more corrosion resistant than steel springs. They're also easier to extend than steel springs. As you stretch an extension spring, it gets harder to pull. Minimum load is the amount of force required to start to extend the spring. Maximum load is the amount of force required to fully extend the spring. Rate is the amount of force required for every inch of extension or, for metric springs, millimeter of compression.
302 stainless steel springs have good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Load, lbs. | |||||||||
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| OD | Wire Dia. | Extended Lg. @ Max. Load | Min. | Max. | Rate, lbs./in. | Material | Pkg. Qty. | Pkg. | |
3.75" Lg. | |||||||||
| 0.5" | 0.054" | 7.75" | 2 | 9.9 | 2.06 | 302 Stainless Steel | 1 | 00000000 | 000000 |
| 0.562" | 0.072" | 6.15" | 4 | 21 | 6.922 | 302 Stainless Steel | 1 | 00000000 | 00000 |
| 0.75" | 0.105" | 4.56" | 13.12 | 32.16 | 23.59 | 302 Stainless Steel | 1 | 00000000 | 0000 |
| 1" | 0.12" | 4.71" | 12.83 | 35.24 | 23.36 | 302 Stainless Steel | 1 | 00000000 | 0000 |
Extension Springs with Special Ends
For specialty applications and connections, these springs have unique end types.
As you stretch an extension spring, it gets harder to pull. Minimum load is the amount of force required to start to extend the spring. Maximum load is the amount of force required to fully extend the spring. Rate is the amount of force required for every inch of extension.
For technical drawings and 3-D models, click on a part number.
Load, lbs. | |||||||||||
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| Style | Lg. | OD | Wire Dia. | Extended Lg @ Max. Load | Min. | Max. | Rate, lbs./in. | Material | Pkg. Qty. | Pkg. | |
Elongated Hook | |||||||||||
| D | 3 3/4" | 0.563" | 0.072" | 4.21" | 4.13 | 17.6 | 29.44 | Galvanized Spring-Tempered Steel | 3 | 00000000 | 000000 |
Slotted Spring Pins
Also known as roll, tension, split, and expansion pins, these pins have a slot along one side that you squeeze closed to install them into unthreaded holes. Once installed, they expand slightly, creating outward tension that holds them tight against the hole wall. These pins absorb shock and vibration in your system, and keep parts from loosening. They are often used as hinge pins, or to hold springs and power transmission components in place.
Install these pins into a hole slightly smaller than the pin diameter. They have at least one chamfered end, which means the end is angled to make insertion easier.
Breaking strength is measured as double shear, which is the amount of force required to break a pin into three pieces.
Steel pins are strong and wear resistant. Pins with a black-phosphate or zinc-plated finish have an outer layer to protect the steel underneath from rust.
18-8 stainless steel pins offer a balance of strength and corrosion resistance.
420 stainless steel pins are as strong and wear resistant as steel, with the addition of corrosion resistance in wet environments.
Passivated pins offer added protection against corrosion and oxidation.
Pins that meet ASME B18.8.2 specifications are made to ASME standards for material and dimensions.
| Lg. | For Hole Dia. | Wall Thick. | Min. Hardness | Breaking Strength, lbs. | Specifications Met | Pkg. Qty. | Pkg. | |
5/16" Dia. | ||||||||
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| 3 3/4" | 0.312"-0.318" | 0.062" | Rockwell C43 | 10,800 | ASME B18.8.2 | 25 | 000000000 | 000000 |
3/8" Dia. | ||||||||
| 3 3/4" | 0.375"-0.382" | 0.077" | Rockwell C43 | 16,300 | ASME B18.8.2 | 10 | 000000000 | 0000 |
1/2" Dia. | ||||||||
| 3 3/4" | 0.5"-0.51" | 0.094" | Rockwell C43 | 27,000 | ASME B18.8.2 | 10 | 000000000 | 00000 |
| Lg. | For Hole Dia. | Wall Thick. | Min. Hardness | Breaking Strength, lbs. | Specifications Met | Pkg. Qty. | Pkg. | |
5/16" Dia. | ||||||||
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| 3 3/4" | 0.312"-0.318" | 0.062" | Rockwell C43 | 10,800 | ASME B18.8.2 | 10 | 000000000 | 00000 |
3/8" Dia. | ||||||||
| 3 3/4" | 0.375"-0.382" | 0.077" | Rockwell C43 | 16,300 | ASME B18.8.2 | 10 | 000000000 | 0000 |
1/2" Dia. | ||||||||
| 3 3/4" | 0.5"-0.51" | 0.094" | Rockwell C43 | 27,000 | ASME B18.8.2 | 5 | 000000000 | 0000 |
| Lg. | For Hole Dia. | Wall Thick. | Min. Hardness | Breaking Strength, lbs. | Passivation | Specifications Met | Pkg. Qty. | Pkg. | |
5/16" Dia. | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 3 3/4" | 0.312"-0.318" | 0.062" | Not Rated | 6,300 | Passivated | ASME B18.8.2 | 5 | 000000000 | 000000 |
3/8" Dia. | |||||||||
| 3 3/4" | 0.375"-0.382" | 0.077" | Not Rated | 9,500 | Passivated | ASME B18.8.2 | 1 | 000000000 | 0000 |
1/2" Dia. | |||||||||
| 3 3/4" | 0.5"-0.51" | 0.094" | Not Rated | 15,800 | Passivated | ASME B18.8.2 | 1 | 000000000 | 0000 |
| Lg. | For Hole Dia. | Wall Thick. | Min. Hardness | Breaking Strength, lbs. | Passivation | Specifications Met | Pkg. Qty. | Pkg. | |
5/16" Dia. | |||||||||
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| 3 3/4" | 0.312"-0.318" | 0.062" | Rockwell C43 | 10,800 | Passivated | ASME B18.8.2 | 5 | 000000000 | 00000 |
3/8" Dia. | |||||||||
| 3 3/4" | 0.375"-0.382" | 0.077" | Rockwell C43 | 16,300 | Passivated | ASME B18.8.2 | 1 | 000000000 | 0000 |
1/2" Dia. | |||||||||
| 3 3/4" | 0.5"-0.51" | 0.094" | Rockwell C43 | 27,000 | Not Passivated | ASME B18.8.2 | 1 | 000000000 | 0000 |