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Spring-Loaded Devices Technical Information

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Basics of...Spring-Loaded Devices

A Spring-Loaded device is a mechanism that adds value to a spring by encapsulating it in a body and providing a plunger tip or ball on one end which allows for accurate and repeatable end forces.

Why Use a Spring-Loaded Device?

  • One subassembly replaces multiple components
  • Allows simple side loading (not possible with springs)
  • Accurate & repeatable end forces
  • Repeatable projection
  • Easier to install than standard springs
  • Minimal spring compression set

Plunger Main Categories

Standard Spring PlungersStandard Spring Plungers: Feature long travel and large bearing surfaces that prevent blinding and assure perfect alignment at any extension. Great for a wide range of applications.

Stubby Spring PlungersStubby Spring Plungers: Compact unit provides considerable plunger travel and high end forces ideal for applications where space is restricted. Offer greater travel than Ball Plungers and less travel than Standard Plungers.

Ball PlungersBall Plungers: Smallest & Lightest Spring-Loaded Device.

Quick Release PlungersQuick Release Plungers: Available in many retractable plunger designs that can be easily withdrawn and re-engaged. Six Types: Knob, Knurled Knob, Hex Drive Knob, T-Handle, Pull- Ring, & Lever Type.

Push Fit PlungersPush-Fit: Designed for easy installation into wood, soft plastic or aluminum. Ideal where a threaded ball plunger is NOT practical or when threaded adjustments are not required.

Flangeless Push FitFlangeless Push-Fit: Innovative design features no flange on ball end allowing the plunger to be inserted into the workpiece from the top or the bottom, front or back. Excellent for use where less clearance is available.

Standard Spring PlungersHexnose Plungers: Can be utilized with a hex wrench to speed up installation or removal process. Offer greater travel than Ball Plungers and less travel than Standard Plungers.

Standard Spring PlungersLong Travel Plungers Ideal for High Speed, long life applications


Carbon Steel: Provides better wear resistance of the plunger tip due to case hardening & is less expensive than Stainless Steel
Stainless Steel: Excellent for corrosive environments, food processing & high temp. applications (spring can withstand 600o F)
Nylon or Delrin®: Will not mar softer materials such as: Aluminum or Brass
Phenolic: Will not mar softer materials such as: Aluminum or Brass, but is more brittle than Nylon or Delrin®


Zinc Plate: yellow, clear or black chromate conversion coat

Black Oxide: Retains lubricants to aid in wear resistance

Additional Information

End Force:Spring-Loaded devices are designed to exert a precise end forcein the correct place at the correct time. End forces range from 125 to 200 lbs.
Travel:This is the range of motion of the Plunger or Ball. Through range oftravel, end forces increase from initial to final as the plunger or ball is depressed
Thread Sizes:
Class 2A Thread - Unified ANSI
Class 6g Thread - Metric

Locking Elements: Forces threads on the opposite side of a spring-loaded device tocompress against the mating threads of a tapped hole, providing a thread lockingproperty. They eliminate the need for checknuts, locking helicoils, or thread lockingadhesives. Max. Temp. limit: 250°F. Most Spring-Loaded Devices are availablewith or without a Nylon Locking Element.
Nylon Pellet: 5�?�16" and larger
Nylon Patch: 1/4" and smaller

5 Steps to Selecting the Right Spring-Loaded Device:

1 Select the type of Spring-Loaded Device for your application
2 Select appropriate end force for application
3 Select material, Carbon Steel, Stainless Steel, Phenolic, Nylon or Delrin®

4 Determine if you need a Locking Element
5 Select the appropriate thread size (hole diameter)

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