Press-Fit Ball-Nose Spring Plungers
Designed with a flange to keep the plunger from being pushed through a hole when the ball is depressed. These spring plungers have a tapered end and smooth body to make them easy to press into unthreaded holes in soft material such as wood, plastic, and aluminum. Drill a slightly smaller hole for a snug fit.
Steel is strong and wear resistant.
Stainless steel is chemical resistant and may be mildly magnetic.
Plastic is chemical resistant and lightweight; plastic noses are extra soft to minimize marring soft surfaces such as aluminum.
Extended nose force is the force required to begin to depress the nose. Compressed nose force is the force required to depress the nose flush with the body. When using a plunger as a detent or stop, a lighter nose force with a shallower hole releases more easily, while a heavier force with a deeper hole holds more securely.
For technical drawings and 3-D models, click on a part number.
Body | Nose | Flange | Nose Force, lbs. | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Dia. | Lg. | Extended Lg. | Dia. | Temp. Range, °F | Dia. | Thick. | Extended | Compressed | Each | |
Steel Body | ||||||||||
Acetal Plastic Nose  | ||||||||||
| 0.125" | 0.252" | 0.035" | 0.093" | __ | 0.187" | 0.032" | 2 | 5 | 000000 | 00000 |
| 0.157" | 0.33" | 0.046" | 1/8" | __ | 0.215" | 0.035" | 1.5 | 3.5 | 0000000 | 0000 |
| 0.157" | 0.33" | 0.046" | 1/8" | __ | 0.215" | 0.035" | 3 | 7.5 | 0000000 | 0000 |
| 0.188" | 0.405" | 0.058" | 0.156" | __ | 0.25" | 0.035" | 4 | 10 | 0000000 | 0000 |
| 0.25" | 0.481" | 0.07" | 0.187" | __ | 0.312" | 0.044" | 6 | 13 | 0000000 | 0000 |
| 0.312" | 0.643" | 0.09" | 1/4" | __ | 0.375" | 0.045" | 8 | 16 | 0000000 | 0000 |
| 0.375" | 0.785" | 0.11" | 0.312" | __ | 0.5" | 0.078" | 10 | 18 | 0000000 | 0000 |
| 0.5" | 1.13" | 0.161" | 0.437" | __ | 0.688" | 0.088" | 12 | 23 | 0000000 | 0000 |
18-8 Stainless Steel Body | ||||||||||
Acetal Plastic Nose | ||||||||||
| 0.125" | 0.252" | 0.035" | 0.093" | -30° to 190° | 0.187" | 0.032" | 2 | 5 | 0000000 | 0000 |
| 0.157" | 0.33" | 0.046" | 1/8" | __ | 0.215" | 0.035" | 0.8 | 2 | 0000000 | 0000 |
| 0.157" | 0.33" | 0.046" | 1/8" | __ | 0.215" | 0.035" | 1.5 | 3.5 | 000000 | 0000 |
| 0.157" | 0.33" | 0.046" | 1/8" | __ | 0.215" | 0.035" | 3 | 7.5 | 0000000 | 0000 |
| 0.188" | 0.405" | 0.058" | 0.156" | -30° to 190° | 0.25" | 0.035" | 4 | 10 | 0000000 | 0000 |
| 0.25" | 0.481" | 0.07" | 0.187" | -30° to 190° | 0.312" | 0.044" | 6 | 13 | 0000000 | 0000 |
| 0.312" | 0.643" | 0.09" | 1/4" | -30° to 190° | 0.375" | 0.045" | 8 | 16 | 0000000 | 0000 |
| 0.375" | 0.785" | 0.11" | 0.312" | -30° to 190° | 0.5" | 0.078" | 10 | 18 | 0000000 | 0000 |
| 0.5" | 1.13" | 0.161" | 0.437" | -30° to 190° | 0.688" | 0.088" | 12 | 23 | 0000000 | 0000 |
Body | Nose | Flange | Nose Force, lbs. | Acetal Plastic Body | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dia., mm | Lg., mm | Extended Lg., mm | Dia., mm | Temp. Range Min. | Temp. Range Max., °F | Dia., mm | Thick., mm | Extended | Compressed | Each | |
400 Series Stainless Steel Nose | |||||||||||
| 3 | 3.4 | 0.55 | 2 | Not Rated | 480° | 3.6 | 0.6 | 0.4 | 0.8 | 0000000 | 00000 |
| 4 | 4 | 0.8 | 3 | Not Rated | 480° | 4.6 | 1 | 0.7 | 1.3 | 0000000 | 0000 |
| 5 | 5 | 1 | 4 | Not Rated | 480° | 5.6 | 1 | 1.3 | 2.1 | 0000000 | 0000 |
| 6 | 6 | 1.6 | 5 | Not Rated | 480° | 6.5 | 1 | 1.4 | 2.8 | 0000000 | 0000 |
| 8 | 8 | 1.9 | 6.5 | Not Rated | 480° | 8.5 | 1 | 2.2 | 4.6 | 0000000 | 0000 |
| 10 | 12 | 2.4 | 8 | Not Rated | 480° | 11 | 1.5 | 2.7 | 5 | 0000000 | 0000 |
| 12 | 14.5 | 3.3 | 10 | Not Rated | 480° | 13 | 1.5 | 3.1 | 5.6 | 0000000 | 0000 |
Acetal Plastic Nose | |||||||||||
| 4 | 4 | 0.8 | 3 | Not Rated | 120° | 4.6 | 1 | 0.7 | 1.5 | 0000000 | 0000 |
| 5 | 5 | 1 | 4 | Not Rated | 120° | 5.6 | 1 | 1.3 | 2.1 | 0000000 | 0000 |
| 6 | 6 | 1.6 | 5 | Not Rated | 120° | 6.5 | 1 | 1.4 | 2.8 | 0000000 | 0000 |
| 8 | 8 | 1.9 | 6.5 | Not Rated | 120° | 8.5 | 1 | 2.2 | 4.6 | 0000000 | 0000 |
| 10 | 12 | 2.4 | 8 | Not Rated | 120° | 11 | 1.5 | 2.7 | 5 | 0000000 | 0000 |
| 12 | 14.5 | 3.3 | 10 | Not Rated | 120° | 13 | 1.5 | 3.1 | 5.6 | 0000000 | 0000 |
Slotted Ball-Nose Spring Plungers
Install these spring plungers with a screwdriver—they're slotted on one or both ends. The ball nose rolls to minimize wear and allow parts to move in and out of position.
440C stainless steel is hard, wear resistant, and mildly chemical resistant.
Plastic is chemical resistant and lightweight; nylon noses are extra soft to minimize marring soft surfaces such as aluminum.
Spring plungers without thread locker are for use in soft material such as aluminum, in extreme temperatures, and on parts requiring frequent assembly and removal.
Extended nose force is the force required to begin to depress the nose. Compressed nose force is the force required to depress the nose flush with the body. When using a plunger as a detent or stop, a lighter nose force with a shallower hole releases more easily, while a heavier force with a deeper hole holds more securely.
For technical drawings and 3-D models, click on a part number.
Nose | Nose Force, lbs. | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Body Lg. | Extended Lg. | Dia. | Temp. Range, °F | Extended | Compressed | Locking Type | Each | |
Acetal Plastic Body and 440C Stainless Steel Nose | |||||||||
| 1/4"-20 | 0.531" | 0.03" | 1/8" | __ | 1 | 2.5 | Without Thread Locker | 00000000 | 00000 |
| 1/4"-20 | 0.531" | 0.03" | 1/8" | __ | 2 | 5 | Without Thread Locker | 00000000 | 0000 |
| 5/16"-18 | 0.578" | 0.039" | 0.156" | __ | 2 | 4.5 | Without Thread Locker | 00000000 | 0000 |
| 5/16"-18 | 0.578" | 0.039" | 0.156" | __ | 4 | 9 | Without Thread Locker | 00000000 | 0000 |
| 3/8"-16 | 0.625" | 0.053" | 0.187" | __ | 2.5 | 5 | Without Thread Locker | 00000000 | 0000 |
| 3/8"-16 | 0.625" | 0.053" | 0.187" | __ | 5 | 10 | Without Thread Locker | 00000000 | 0000 |
Acetal Plastic Body and Nylon Plastic Nose | |||||||||
| 1/4"-20 | 0.531" | 0.03" | 1/8" | -20° to 180° | 1 | 2.5 | Without Thread Locker | 00000000 | 0000 |
| 1/4"-20 | 0.531" | 0.03" | 1/8" | -20° to 180° | 2 | 5 | Without Thread Locker | 00000000 | 0000 |
| 5/16"-18 | 0.578" | 0.039" | 0.156" | -20° to 180° | 2 | 4.5 | Without Thread Locker | 00000000 | 0000 |
| 5/16"-18 | 0.578" | 0.039" | 0.156" | -20° to 180° | 4 | 9 | Without Thread Locker | 00000000 | 0000 |
| 3/8"-16 | 0.625" | 0.053" | 0.187" | -20° to 180° | 2.5 | 5 | Without Thread Locker | 00000000 | 0000 |
| 3/8"-16 | 0.625" | 0.053" | 0.187" | -20° to 180° | 5 | 10 | Without Thread Locker | 00000000 | 0000 |