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.
316 stainless steel is more corrosion resistant than 440C and 18-8 stainless steel and can be used in saltwater environments.
18-8 stainless steel is chemical resistant.
Brass is corrosion resistant in wet environments; brass noses are soft to minimize marring.
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.
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.
Nose | Nose Force, lbs. | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Thread Size  | Body Lg. | Extended Lg. | Dia. | Temp. Range, °F | Extended | Compressed | Choose a Locking Type | Each | |
Steel Body and 440C Stainless Steel Nose | |||||||||
| 5-40 | 0.25" | 0.02" | 0.062" | __ | 0.3 | 0.8 | 0000000 | 00000 | |
Steel Body and Nylon Plastic Nose | |||||||||
| 5-40 | 0.25" | 0.02" | 0.062" | -20° to 180° | 0.3 | 0.8 | 00000000 | 0000 | |
316 Stainless Steel Body and 316 Stainless Steel Nose | |||||||||
| 5-40 | 0.25" | 0.02" | 0.062" | __ | 0.3 | 0.8 | 0000000 | 00000 | |
18-8 Stainless Steel Body and 440C Stainless Steel Nose | |||||||||
| 5-40 | 0.25" | 0.02" | 0.062" | __ | 0.3 | 0.8 | 0000000 | 0000 | |
18-8 Stainless Steel Body and Nylon Plastic Nose | |||||||||
| 5-40 | 0.25" | 0.02" | 0.062" | -20° to 180° | 0.3 | 0.8 | 00000000 | 0000 | |
Brass Body and Brass Nose | |||||||||
| 5-40 | 0.25" | 0.02" | 0.062" | __ | 0.3 | 0.8 | 0000000 | 0000 | |
Threaded Plug Gauges with Calibration Certificate
These gauges come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy. They allow you to inspect internal threads on parts. All have a go gauge on one end and a no-go gauge on the other end. A taperlock handle lets you quickly replace worn gauges.
Check the minimum internal thread size with the go gauge end, and check the maximum internal thread size with the no-go gauge end. A part is within tolerance if it’s easy to thread the go gauge into the part but difficult to thread the no-go gauge more than two turns.
Threads have different classes of fit. Thread fit designates the tightness or looseness of mating threads. For example, inch threads with a 3B fit have tighter tolerances than threads with a 2B fit.
For technical drawings and 3-D models, click on a part number.
Threaded Plug Gauges
These have a go gauge on one end and a no-go gauge on the other end. They allow you to inspect internal threads on parts. A taperlock handle lets you quickly replace worn gauges.
Check the minimum internal thread size with the go gauge end, and check the maximum internal thread size with the no-go gauge end. A part is within tolerance if it’s easy to thread the go gauge into the part but difficult to thread the no-go gauge more than two turns.
Threads have different classes of fit. Thread fit designates the tightness or looseness of mating threads. For example, inch threads with a 3B fit have tighter tolerances than threads with a 2B fit.
For technical drawings and 3-D models, click on a part number.
Threaded Hole Location Gauges
Find the true center of threaded holes to precisely align and measure parts. Once you thread these gauges into a hole, their cylinder sticks out as a reliable reference point. They’re often used with a coordinate measuring machine (CMM) to pinpoint the coordinates of the cylinder’s exact center. You can then use those coordinates to measure distances between points or reference them for error-free assembly. Even without a CMM, you can use these gauges with a micrometer to measure accurate center-to-center distances.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Thread Type | Hardness | Material | Each | |
| 5-40 | UNC | Rockwell C60 | Tool Steel | 0000000 | 0000000 |