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From locking, to locating and indexing, positioning and clamping, to securing, ejecting, notching and dampening, a spring plunger is a vital component in the design engineer’s toolbox.  

Spring plungers are simple devices and consist of only three components: a body, spring, and ball. The body is typically manufactured from steel or stainless steel, and threaded, enabling quick and secure installation in any orientation.  

Spring plungers allow for accurate, repeatable, and rapid adjustments on a variety of platforms, fixtures, and furniture. The basic function of a spring plunger is achieved by the internal spring that maintains a constant force on a steel or stainless-steel ball, thereby always ensuring the ball remains in an extended or retracted position.  

In most cases a notch or series of notches is present in the counterpart. In this case the ball will remain in the retracted position until it meets a notch in the counterpart, then the spring force will push the ball into the notch and create a temporary ‘lock’ until sufficient lateral force is applied to compress the spring, retract the ball, and allow the object to move again. This ball and spring combination ensures wear on the counterpart is minimised, and maintenance is virtually zero.  

Rencol’s spring plungers are available in steel and stainless steel, in metric sizes from M3 up M20. Our clients include manufacturers of gym equipment, medical aids, catering equipment, conveyors, aerospace, defence, automotive. We have large stocks in Bristol, all ready for shipping to you in just 48 hours. 

Rencol Components Ltd

Founded in Bristol in 1923, Rencol Components has a long-standing history of design engineering and plastic component manufacturing.

Founded in Bristol in 1923, Rencol Components has a long-standing history of design engineering and plastic component manufacturing. Today, an extensive and industry standard range of plastic and metal knobs, handles, hand wheels, hinges, levers, levelling feet and indexing plungers are manufactured at our partner facilities in Shanghai, China, and distributed from our warehouse facility in Avonmouth, Bristol, and globally to our network of approved distributors.

Rencol offers a flexible custom manufacturing service including bespoke products and the addition of logos, RAL colours, custom insert and thread materials to our standard product line.

Rencol stands for exceptional product quality and reliability, a secure and efficient supply chain and experienced, knowledgeable customer service. Rencol is ISO 9001/2000 certified.

Product categories

  • Plastic knobs
  • Metal knobs
  • Plastic and metal bridge handles, pull handles, door handles, furniture handles
  • Plastic and metal clamping handles and indexing levers
  • Plastic and metal levelling feet, swivel feet, machine feet
  • Index plungers, indexing bolts, cam plungers and ball-spring plungers
  • Plastic cranking handles
  • Plastic handles, revolving handles, taper handles, T-handles, tee handles
  • Plastic and metal handwheels
  • Plastic and metal hinges
  • PVC grip handles
  • Plastic lobe knobs
  • Plastic scallop knobs
  • Plastic wing knobs
  • Plastic star knobs
  • Plastic ball knobs
  • Plastic button knobs
  • Plastic taper knobs
  • Plastic thumbscrew knobs
  • Plastic self-assembly knobs

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