Overload-Prevention Extension Springs
These zinc-plated steel springs have mild corrosion resistance. All have drawbars to prevent overextending, which can cause failure.
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. 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. | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | OD | Wire Dia. | Extended Lg. @ Max. Load | Min. | Max. | Spring Rate, lbs./in.  | Material | End Type | Each | |
| 4" | 0.675" | 0.048" | 6.2" | Not Rated | 5.01 | 2.28 | Zinc-Plated Spring-Tempered Steel | Loop | 000000 | 00000 |
| 6" | 1.1" | 1/8" | 7.9" | Not Rated | 55.1 | 29 | Zinc-Plated Spring-Tempered Steel | Loop | 000000 | 00000 |
| 6" | 1.162" | 0.072" | 10" | Not Rated | 11.1 | 2.77 | Zinc-Plated Spring-Tempered Steel | Loop | 000000 | 00000 |
| 6" | 1.192" | 0.092" | 9" | Not Rated | 12.62 | 4.21 | Zinc-Plated Spring-Tempered Steel | Loop | 000000 | 00000 |
| 7" | 1.125" | 0.112" | 8.9" | Not Rated | 95 | 50 | Zinc-Plated Spring-Tempered Steel | Loop | 0000000 | 00000 |
| 7.5" | 0.875" | 0.105" | 9.85" | Not Rated | 42.3 | 18 | Zinc-Plated Spring-Tempered Steel | Loop | 000000 | 00000 |
| 7.5" | 1.375" | 0.148" | 9.6" | Not Rated | 160 | 75 | Zinc-Plated Spring-Tempered Steel | Loop | 0000000 | 00000 |
| 7.875" | 2.1" | 1/4" | 10.625" | Not Rated | 180.65 | 65.69 | Zinc-Plated Spring-Tempered Steel | Loop | 000000 | 00000 |
| 8" | 2.1" | 0.312" | 9.85" | Not Rated | 332.72 | 179.85 | Zinc-Plated Spring-Tempered Steel | Loop | 000000 | 00000 |
| 8.5" | 1.746" | 0.148" | 12.5" | Not Rated | 54.08 | 13.52 | Zinc-Plated Spring-Tempered Steel | Loop | 0000000 | 00000 |
| 8.5" | 1.875" | 1/4" | 10.35" | Not Rated | 222 | 109.6 | Zinc-Plated Spring-Tempered Steel | Loop | 000000 | 00000 |
| 8.75" | 1.375" | 0.207" | 9.95" | Not Rated | 174 | 145 | Zinc-Plated Spring-Tempered Steel | Loop | 000000 | 00000 |
| 13.75" | 1.625" | 1/4" | 15.4" | Not Rated | 247.5 | 150 | Zinc-Plated Spring-Tempered Steel | Loop | 0000000 | 00000 |
| 13.75" | 2.462" | 0.312" | 17.15" | Not Rated | 313.81 | 92.3 | Zinc-Plated Spring-Tempered Steel | Loop | 0000000 | 00000 |
| 16" | 1.87" | 0.135" | 21" | Not Rated | 38.09 | 7.62 | Zinc-Plated Spring-Tempered Steel | Loop | 0000000 | 00000 |
Corrosion-Resistant Overload-Prevention Extension Springs
Made of stainless steel, these springs are more corrosion resistant than steel extension springs. All have drawbars to prevent overextending, which can cause failure.
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. 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. | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | OD | Wire Dia. | Extended Lg. @ Max. Load | Min. | Max. | Spring Rate, lbs./in. | Material | End Type | Each | |
| 4" | 0.675" | 0.048" | 6.3" | Not Rated | 5.24 | 2.28 | 302 Stainless Steel | Loop | 0000000 | 000000 |
| 4" | 1" | 0.12" | 5.3" | Not Rated | 70 | 50 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 5" | 1.125" | 0.12" | 6.6" | Not Rated | 120 | 75 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 6" | 1.1" | 1/8" | 8.35" | Not Rated | 68.15 | 29 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 6" | 1.162" | 0.072" | 10.1" | Not Rated | 11.38 | 2.77 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 6" | 1.192" | 0.092" | 9.25" | Not Rated | 13.67 | 4.21 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 6" | 1.219" | 0.177" | 7.5" | Not Rated | 150 | 100 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 7" | 1.5" | 0.187" | 8.4" | Not Rated | 210 | 150 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 7.5" | 0.875" | 0.105" | 10.25" | Not Rated | 49.5 | 18 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 7.875" | 2.1" | 1/4" | 11.125" | Not Rated | 213.3 | 65.69 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 8" | 2.1" | 0.312" | 10.19" | Not Rated | 365.97 | 167.11 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 8.5" | 1.746" | 0.148" | 12.9" | Not Rated | 59.6 | 13.52 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 8.5" | 1.875" | 1/4" | 10.5" | Not Rated | 240 | 118.68 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 8.75" | 1.375" | 0.207" | 10.1" | Not Rated | 195.75 | 145 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 13.75" | 1.625" | 1/4" | 15.5" | Not Rated | 262.5 | 150 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 13.75" | 2.462" | 0.312" | 17.45" | Not Rated | 316.11 | 85.44 | 302 Stainless Steel | Loop | 0000000 | 00000 |
| 16" | 1.87" | 0.135" | 21" | Not Rated | 38.09 | 7.62 | 302 Stainless Steel | Loop | 0000000 | 00000 |
Corrosion-Resistant Swiveling Extension Spring Stud Anchors
These stainless steel anchor studs offer excellent corrosion resistance. The head swivels 360° so the spring stays straight and properly coiled. Attach an extension spring to a stud and then thread the stud into your part for a secure connection. To make tightening easier, anchors have a hex socket on the bottom and wrench flats at the top of the threads.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||
|---|---|---|---|---|---|---|---|---|
| Size | Min. Lg. | Lg. | Dia. | Hole Dia. | Hex Size | Material | Each | |
| 6-32 | 3/8" | 5/8" | 0.138" | 0.08" | 0.035" | 18-8 Stainless Steel | 000000000 | 000000 |
| 6-40 | 5/8" | 5/8" | 1/8" | 0.08" | 0.035" | 18-8 Stainless Steel | 000000000 | 00000 |
| 8-32 | 5/8" | 7/8" | 0.164" | 0.1" | 0.05" | 18-8 Stainless Steel | 000000000 | 00000 |
| 10-24 | 3/4" | 1 1/8" | 1/4" | 0.12" | 0.05" | 18-8 Stainless Steel | 000000000 | 00000 |
| 10-32 | 3/4" | 1 1/8" | 1/4" | 0.12" | 1/16" | 18-8 Stainless Steel | 000000000 | 00000 |
| 1/4"-20 | 7/8" | 1 1/4" | 1/4" | 0.15" | 5/64" | 18-8 Stainless Steel | 000000000 | 00000 |
| 1/4"-28 | 7/8" | 1 1/4" | 1/4" | 0.15" | 5/64" | 18-8 Stainless Steel | 000000000 | 00000 |
| 3/8"-16 | 1 1/8" | 1 5/8" | 3/8" | 0.22" | 1/8" | 18-8 Stainless Steel | 000000000 | 00000 |
| 3/8"-24 | 1 1/8" | 1 5/8" | 3/8" | 0.22" | 1/8" | 18-8 Stainless Steel | 000000000 | 00000 |
Thread | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | Pitch, mm | Min. Lg., mm | Lg., mm | Dia., mm | Hole Dia., mm | Hex Size, mm | Material | Each | |
| M3.5 | 0.6 | 10 | 16 | 3.5 | 2 | 0.9 | 18-8 Stainless Steel | 000000000 | 000000 |
| M4 | 0.7 | 16 | 22 | 4 | 2.5 | 1.3 | 18-8 Stainless Steel | 000000000 | 00000 |
| M5 | 0.8 | 19 | 28 | 5 | 3 | 1.5 | 18-8 Stainless Steel | 000000000 | 00000 |
| M6 | 1 | 22 | 32 | 6 | 4 | 2 | 18-8 Stainless Steel | 000000000 | 00000 |
| M8 | 1.25 | 25 | 38 | 8 | 5 | 2.5 | 18-8 Stainless Steel | 000000000 | 00000 |
| M10 | 1.5 | 28 | 41 | 10 | 6 | 3 | 18-8 Stainless Steel | 000000000 | 00000 |
Swiveling Extension Spring Stud Anchors
A black-oxide finish provides these steel anchors with mild corrosion resistance. The head swivels 360° so the spring stays straight and properly coiled. Attach an extension spring to a stud and then thread the stud into your part for a secure connection. To make tightening easier, anchors have a hex socket on the bottom and wrench flats at the top of the threads.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||
|---|---|---|---|---|---|---|---|---|
| Size | Min. Lg. | Lg. | Dia. | Hole Dia. | Hex Size | Material | Each | |
| 6-32 | 3/8" | 5/8" | 0.138" | 0.08" | 0.035" | Black-Oxide Steel | 000000000 | 00000 |
| 8-32 | 5/8" | 7/8" | 0.164" | 0.1" | 0.05" | Black-Oxide Steel | 000000000 | 00000 |
| 10-24 | 3/4" | 1 1/8" | 1/4" | 0.12" | 0.05" | Black-Oxide Steel | 000000000 | 00000 |
| 10-32 | 3/4" | 1 1/8" | 1/4" | 0.12" | 1/16" | Black-Oxide Steel | 000000000 | 00000 |
| 1/4"-20 | 7/8" | 1 1/4" | 1/4" | 0.15" | 5/64" | Black-Oxide Steel | 000000000 | 00000 |
| 1/4"-28 | 7/8" | 1 1/4" | 1/4" | 0.15" | 5/64" | Black-Oxide Steel | 000000000 | 00000 |
| 3/8"-16 | 1 1/8" | 1 5/8" | 3/8" | 0.22" | 1/8" | Black-Oxide Steel | 000000000 | 00000 |
| 3/8"-24 | 1 1/8" | 1 5/8" | 3/8" | 0.22" | 1/8" | Black-Oxide Steel | 000000000 | 00000 |
Thread | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | Pitch, mm | Min. Lg., mm | Lg., mm | Dia., mm | Hole Dia., mm | Hex Size, mm | Material | Each | |
| M3.5 | 0.6 | 10 | 16 | 3.5 | 2 | 0.9 | Black-Oxide Steel | 000000000 | 000000 |
| M4 | 0.7 | 16 | 22 | 4 | 2.5 | 1.3 | Black-Oxide Steel | 000000000 | 00000 |
| M5 | 0.8 | 19 | 28 | 5 | 3 | 1.5 | Black-Oxide Steel | 000000000 | 00000 |
| M6 | 1 | 22 | 32 | 6 | 4 | 2 | Black-Oxide Steel | 000000000 | 00000 |
| M8 | 1.25 | 25 | 38 | 8 | 5 | 2.5 | Black-Oxide Steel | 000000000 | 00000 |
| M10 | 1.5 | 28 | 41 | 10 | 6 | 3 | Black-Oxide Steel | 000000000 | 00000 |
Corrosion-Resistant Extension Spring Stud Anchors
These stainless steel anchor studs offer excellent corrosion resistance. Attach an extension spring to a stud and then thread the stud into your part for a secure connection.
For technical drawings and 3-D models, click on a part number.
Thread | |||||||
|---|---|---|---|---|---|---|---|
| Size | Min. Lg. | Lg. | Dia. | Hole Dia. | Material | Each | |
| 6-32 | 3/8" | 5/8" | 0.138" | 0.08" | 18-8 Stainless Steel | 000000000 | 00000 |
| 6-40 | 5/8" | 5/8" | 0.138" | 0.08" | 18-8 Stainless Steel | 000000000 | 0000 |
| 8-32 | 5/8" | 7/8" | 0.164" | 0.1" | 18-8 Stainless Steel | 000000000 | 0000 |
| 8-36 | 5/8" | 7/8" | 0.164" | 0.1" | 18-8 Stainless Steel | 000000000 | 0000 |
| 10-24 | 3/4" | 1 1/8" | 0.19" | 0.12" | 18-8 Stainless Steel | 000000000 | 0000 |
| 10-32 | 3/4" | 1 1/8" | 0.19" | 0.12" | 18-8 Stainless Steel | 000000000 | 00000 |
| 1/4"-20 | 7/8" | 1 1/4" | 1/4" | 0.15" | 18-8 Stainless Steel | 000000000 | 0000 |
| 1/4"-20 | 7/8" | 1 1/4" | 1/4" | 0.268" | 18-8 Stainless Steel | 000000000 | 00000 |
| 1/4"-28 | 7/8" | 1 1/4" | 1/4" | 0.15" | 18-8 Stainless Steel | 000000000 | 0000 |
| 3/8"-16 | 1 1/8" | 1 5/8" | 3/8" | 0.22" | 18-8 Stainless Steel | 000000000 | 00000 |
| 3/8"-16 | 1 1/8" | 1 5/8" | 3/8" | 0.268" | 18-8 Stainless Steel | 000000000 | 00000 |
| 3/8"-24 | 1 1/8" | 1 5/8" | 3/8" | 0.22" | 18-8 Stainless Steel | 000000000 | 00000 |
Thread | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | Pitch, mm | Min. Lg., mm | Lg., mm | Dia., mm | Hole Dia., mm | Material | Anchor Type | Each | |
| M3.5 | 0.6 | 10 | 16 | 3.5 | 2 | 18-8 Stainless Steel | Stud | 000000000 | 000000 |
| M4 | 0.7 | 16 | 22 | 4 | 2.5 | 18-8 Stainless Steel | Stud | 000000000 | 00000 |
| M5 | 0.8 | 19 | 28 | 5 | 3 | 18-8 Stainless Steel | Stud | 000000000 | 00000 |
| M6 | 1 | 22 | 32 | 6 | 4 | 18-8 Stainless Steel | Stud | 000000000 | 00000 |
| M8 | 1.25 | 25 | 38 | 8 | 5 | 18-8 Stainless Steel | Stud | 000000000 | 00000 |
| M10 | 1.5 | 28 | 41 | 10 | 6 | 18-8 Stainless Steel | Stud | 000000000 | 00000 |
Extension Spring Stud Anchors
A black-oxide finish provides these steel anchors with mild corrosion resistance. Attach an extension spring to a stud and then thread the stud into your part for a secure connection.
For technical drawings and 3-D models, click on a part number.
Thread | |||||||
|---|---|---|---|---|---|---|---|
| Size | Min. Lg. | Lg. | Dia. | Hole Dia. | Material | Each | |
| 6-32 | 3/8" | 5/8" | 0.138" | 0.08" | Black-Oxide Steel | 0000000 | 00000 |
| 6-40 | 3/8" | 5/8" | 0.138" | 0.08" | Black-Oxide Steel | 0000000 | 0000 |
| 8-32 | 5/8" | 7/8" | 0.164" | 0.1" | Black-Oxide Steel | 0000000 | 0000 |
| 8-36 | 5/8" | 7/8" | 0.164" | 0.1" | Black-Oxide Steel | 0000000 | 0000 |
| 10-24 | 3/4" | 1 1/8" | 0.19" | 0.12" | Black-Oxide Steel | 0000000 | 0000 |
| 10-32 | 3/4" | 1 1/8" | 0.19" | 0.12" | Black-Oxide Steel | 0000000 | 0000 |
| 1/4"-20 | 7/8" | 1 1/4" | 1/4" | 0.15" | Black-Oxide Steel | 0000000 | 0000 |
| 1/4"-20 | 7/8" | 1 1/4" | 1/4" | 0.268" | Black-Oxide Steel | 0000000 | 0000 |
| 1/4"-28 | 7/8" | 1 1/4" | 1/4" | 0.15" | Black-Oxide Steel | 0000000 | 0000 |
| 3/8"-16 | 1 1/8" | 1 5/8" | 3/8" | 0.22" | Black-Oxide Steel | 0000000 | 0000 |
| 3/8"-16 | 1 1/8" | 1 5/8" | 3/8" | 0.268" | Black-Oxide Steel | 0000000 | 0000 |
| 3/8"-24 | 1 1/8" | 1 5/8" | 3/8" | 0.22" | Black-Oxide Steel | 0000000 | 0000 |
Thread | ||||||||
|---|---|---|---|---|---|---|---|---|
| Size | Pitch, mm | Min. Lg., mm | Lg., mm | Dia., mm | Hole Dia., mm | Material | Each | |
| M3.5 | 0.6 | 10 | 16 | 3.5 | 2 | Black-Oxide Steel | 0000000 | 00000 |
| M4 | 0.7 | 16 | 22 | 4 | 2.5 | Black-Oxide Steel | 0000000 | 0000 |
| M5 | 0.8 | 19 | 28 | 5 | 3 | Black-Oxide Steel | 0000000 | 0000 |
| M6 | 1 | 22 | 32 | 6 | 4 | Black-Oxide Steel | 0000000 | 0000 |
| M8 | 1.25 | 25 | 38 | 8 | 5 | Black-Oxide Steel | 0000000 | 0000 |
| M10 | 1.5 | 28 | 41 | 10 | 6 | Black-Oxide Steel | 0000000 | 0000 |