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    8 Products

    Ball-Nose Spring Plungers

    Image of Product. Front orientation. Spring Plungers. Ball-Nose Spring Plungers.
    Image of Attribute. Front orientation. Contains Annotated. Ball-Nose Spring Plungers.
    Align, position, and lock moving parts for most machining and assembly tasks. These spring plungers have a spring-loaded ball that compresses when a part presses against it, and then pops out into a notch or groove to hold the part in place. Unlike long-nose spring plungers, the ball rolls easily in and out of position, so they're a great fit for applications that require consistent, smooth movement, such as positioning parts in an assembly line and aligning fixtures and jigs when cutting or drilling.
    Spring plungers are available with or without a threadlocker. Those with a threadlocker won't wiggle loose from vibration. Spring plungers without a threadlocker are easier to remove.
    440C Stainless Steel Nose—The strongest, most wear-resistant stainless steel noses, these grind against hard metal surfaces without denting or scratching. However, they are not as corrosion resistant as 316 stainless steel.
    Nylon Nose—Extra soft to avoid scratching delicate surfaces. Nylon is best for use on soft materials, such as aluminum. It will swell and weaken when exposed to moisture, however, so it should only be used in dry environments.
    Extended Nose Force—This is the amount of force needed to start depressing the nose.
    Compressed Nose Force—This is the amount of force needed to fully depress the nose into the plunger body, so it releases from a hole, notch, or surface. A lighter compressed nose force with a shallower hole releases more easily, while a heavier compressed nose force with a deeper hole holds more securely.
    Spring Plungers
    Spring
    Plunger Drivers
    Nose,
    mm
    Nose
    Force, lbf
    Body
    Drive
    Style
    Thread
    Size
    Extended
    Lg.
    Dia.
    Extended
    Compressed
    Material
    Lg.,
    mm
    Front
    Back
    Each
    Each
    440C Stainless Steel Nose
    M4 x 0.7 mm0.82.50.92.318-8 Stainless Steel
    		9Spring Plunger DriverSlotted
    		0000000000000000000000000
    M4 x 0.7 mm0.82.50.92.3Steel9Spring Plunger DriverSlotted
    		0000000000000000000000
     
    Nylon Nose
    M4 x 0.7 mm0.82.50.92.318-8 Stainless Steel
    		9Spring Plunger DriverSlotted
    		00000000000000000000000
    M4 x 0.7 mm0.82.50.92.3Steel9Spring Plunger DriverSlotted
    		0000000000000000000000
     

    Long-Nose Spring Plungers

    Image of ProductInUse. Front orientation. Contains Annotated, Border. Spring Plungers. Long-Nose Spring Plungers.
    Image of Product. Front orientation. Spring Plungers. Long-Nose Spring Plungers.
    Image of Attribute. Front orientation. Contains Annotated. Long-Nose Spring Plungers.
    Lock heavy moving parts securely in place. Often used in indexing applications, these have a longer nose than ball-nose spring plungers to withstand greater side forces without disengaging. The nose compresses when a part presses against it, and then pops out into deep notches or grooves for a strong hold.
    Spring plungers are available with or without a threadlocker. Those with a threadlocker won't wiggle loose from vibration. Spring plungers without a threadlocker are easier to remove.
    Acetal Nose—The best plastic for damp and wet environments, acetal won't swell or lose strength if exposed to moisture. These noses are extra soft to avoid scratching delicate surfaces. They are best for use on soft materials, such as aluminum.
    Extended Nose Force—This is the amount of force needed to start depressing the nose.
    Compressed Nose Force—This is the amount of force needed to fully depress the nose into the plunger body, so it releases from a hole, notch, or surface. A lighter compressed nose force with a shallower hole releases more easily, while a heavier compressed nose force with a deeper hole holds more securely.
    Spring Plungers
    Spring
    Plunger Drivers
    Nose,
    mm
    Nose
    Force, lbf
    Body
    Drive
    Style
    Thread
    Size
    Extended
    Lg.
    Dia.
    Extended
    Compressed
    Material
    Lg.,
    mm
    Front
    Back
    Each
    Each
    Acetal Nose
    M4 x 0.7 mm1.51.513.618-8 Stainless Steel
    		15Spring Plunger Driver—000000000000000000000000
    M4 x 0.7 mm1.51.513.6Black-Oxide Steel15Spring Plunger Driver—0000000000000000000000
    M4 x 0.7 mm2.41.82.77.3Black-Oxide Steel15.9—Hex
    		000000000000———0
     

    Spring Plunger Drivers

    Image of Product. Front orientation. Spring Plunger Drivers.
    Install spring plungers from the nose end without depressing the nose.
    For Thread
    Size
    For Spring
    Plunger Nose Type
    Each
    Steel
    8-32, M4Ball, Long000000000000
     
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