Knob-Style Retractable Spring Plungers
Retract the nose by pulling the knob. These spring plungers have a long nose that provides a large bearing surface to handle side loads.
Smooth knob spring plungers with a hex nut can be held in place with the nut after threading to your desired depth.
Steel is strong and wear resistant.
Plastic is chemical resistant and lightweight.
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.
Thread | Nose | Handle | Nose Force, lbs. | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Size | Lg. | Body Lg. | Extended Lg. | Dia. | Dia. | Material | Texture | Extended | Compressed | Includes | Locking Type | Each | |
Black-Oxide Steel Body and Steel Nose | |||||||||||||
| 3/8"-24 | 0.669" | 1.575" | 0.197" | 0.197" | 0.827" | Nylon Plastic | Smooth | 1.6 | 3.6 | Hex Nut | Without Thread Locker | 0000000 | 000000 |
Twist-to-Lock Knob-Style Retractable Spring Plungers
Smooth Knob With Hex Nut |  With Thread Locker |
Without Thread Locker |
Lock the nose into the retracted position by pulling the knob and rotating it 90°. These spring plungers have a long nose that provides a large bearing surface to handle side loads.
Smooth knob spring plungers with a hex nut can be held in place with the nut after threading to your desired depth.
Steel is strong and wear resistant. Black-oxide steel bodies resist corrosion in dry environments.
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.
Spring plungers with thread locker have a locking patch that adds friction to resist loosening.
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.
Thread | Nose | Nose Force, lbs. | Handle | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size | Lg. | Body Lg. | Extended Lg. | Dia. | Extended | Compressed | Dia. | Texture | Includes | Choose a Locking Type | Each | |
Black-Oxide Steel Body and Steel Nose | ||||||||||||
| 3/8"-24 | 0.67" | 1.81" | 0.2" | 0.2" | 1.5 | 3.5 | 0.83" | Smooth | Hex Nut | 0000000 | 000000 | |
Add-a-Knob Retractable Spring Plungers
Thread onto machinery or attach a knob or handle to the threaded spindle. The nose is long to provide a large bearing surface to handle side loads.
Spring plungers with a hex nut can be held in place with the nut after threading to your desired depth. The body has a permanent hex nut attached that allows you to hold the spring plunger in place with a wrench.
Steel is strong and wear resistant.
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.
Thread | Nose | Nose Force, lbs. | Knob End Thread | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size | Lg. | Body Lg. | Extended Lg. | Dia. | Extended | Compressed | Size | Lg. | Includes | Locking Type | Each | |
Steel Body and Steel Nose | ||||||||||||
| 3/8"-24 | 0.669" | 1.299" | 0.197" | 0.197" | 1.6 | 3.6 | M5 × 0.8 mm | 1/4" | Hex Nut | Without Thread Locker | 0000000 | 000000 |
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.
Steel is strong and wear resistant.
440C stainless steel is hard, wear resistant, and mildly chemical resistant.
18-8 stainless steel is chemical resistant.
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.
Spring plungers with thread locker have a locking element that adds friction to resist loosening.
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.
