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Pins · Spring Plungers

Threaded Spring Plungers

8 catalogued sizes, dimensioned to Trade series (GN 615). Pick any row and the technical drawing redraws to it.

Threaded Spring Plungers to Trade series (GN 615) are catalogued in sizes M2 to M20. 8 sizes are held in the table below, and the technical drawing redraws to whichever row you select.

Standard
Trade series (GN 615)
Size range
M2-M20
Catalogued sizes
8

Dimensions are nominal values from the governing standard. Confirm the tolerance class for your application before ordering.

Threaded Spring Plungers technical product image

Applications & Industries

What Threaded Spring Plungers are specified for, industry by industry. Stocked from M2 to M20.

Industries that specify Threaded Spring Plungers

  • Conveyor changeover Low-force positioning of guides and adjustable stops.
  • Instrument controls Small locating contacts under knobs, slides and adjustment parts.
  • Jig and fixture building Threaded spring plungers used for stops, detents and repeat location.
  • Machine guarding Spring contacts that hold removable covers in a chosen position.
  • Agricultural & plant Implement connections made and broken in the field.
  • Gearboxes & housings Dowelled joints where the bolts clamp and the pins locate.

Typical applications

  • setting a repeatable detent without a loose removable pin
  • matching ball and housing material to the contact environment
  • providing a threaded spring-loaded ball contact
  • choosing standard, high-load or locking-slot plunger types
  • pivot and hinge joints loaded in shear
  • quick connections made and broken by hand

Service conditions to specify against

Marine and coastal
Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
Hole preparation
The hole is half the specification: a ground dowel needs a reamed H7 hole, a grooved or spring pin will hold in a drilled one.

Where to use something else

  • Do not use a spring plunger as the primary shear retainer or as a substitute for a clamp bolt.

Full application guide: where Threaded Spring Plungers are used, how to specify them, and the cases they are wrong for

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

Request a Quotation for Threaded Spring Plungers

The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.

Request a Quotation

Specification
Business Information

Dimensions & Specifications (Trade series (GN 615))

Every row below is a starting point for the customizer above — pick any size and the drawing will redraw to that row.

Thread sizePlunger typesHousing materialBall materialSpring material
M2K / KS / KN / KSNblackened steel or AISI 303 stainlesshardened steel or AISI 420C stainlessAISI 631
M3K / KS / KN / KSNblackened steel or AISI 303 stainlesshardened steel or AISI 420C stainlessAISI 631
M4K / KS / KN / KSNblackened steel or AISI 303 stainlesshardened steel or AISI 420C stainlessAISI 631
M5K / KS / KN / KSNblackened steel or AISI 303 stainlesshardened steel or AISI 420C stainlessAISI 631
M6K / KS / KN / KSNblackened steel or AISI 303 stainlesshardened steel or AISI 420C stainlessAISI 631
M8K / KS / KN / KSNblackened steel or AISI 303 stainlesshardened steel or AISI 420C stainlessAISI 631
M12K / KS / KN / KSNblackened steel or AISI 303 stainlesshardened steel or AISI 420C stainlessAISI 631
M20K / KS / KN / KSNblackened steel or AISI 303 stainlesshardened steel or AISI 420C stainlessAISI 631

Threaded Spring Plungers (Trade series (GN 615)) are a type of pins used across industrial assembly. Below is the complete size table together with material, standard and application guidance.

What Are Threaded Spring Plungers?

Threaded Spring Plungers are pins defined by Trade series (GN 615). They are selected by thread size and the dimensional characteristics shown below, and are available in a range of materials and finishes to suit the application and environment.

Materials & Finishes

Common materials include carbon steel (typically zinc plated or hot-dip galvanized), hardened or case-hardened steel where wear matters, and stainless steel A2 (304) or A4 (316) for corrosion resistance. Specify the material, hardness where relevant, and the surface finish appropriate to your application and environment.

Pricing

Threaded Spring Plungers are supplied to order. Pricing starts from approximately US$0.35 per piece for standard sizes in carbon steel; final pricing depends on size, material, finish and order quantity (MOQ applies). Submit your exact configuration with the quote form above.

Inside the plant

Manufactured in our own plant

This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.

  1. Wire rod feeding into a cold heading machine
    01

    Cold heading

    Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.

    Head dimensions and under-head radius checked at set-up and per shift.

  2. Thread rolling machine producing bolt threads
    02

    Thread rolling

    Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.

    Go / no-go ring gauges to ISO 965 tolerance class 6g.

  3. Baskets of bolts staged for heat treatment
    03

    Heat treatment

    Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.

    Core hardness and tensile tested per lot to ISO 898-1.

  4. Zinc plated bolts in a treatment basket
    04

    Surface treatment

    Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.

    Coating thickness and neutral salt spray hours to ISO 9227.

Video: Threaded Spring Plungers

Third-party video, selected automatically for this topic. It is not produced by Engineering Hardware and is not a specification source — use the tables on this page for dimensional data.

Frequently Asked Questions

What is the controlling standard for Threaded Spring Plungers?

Threaded Spring Plungers are manufactured to Trade series (GN 615). The dimensional values on this page follow that standard.

What is the size range of Threaded Spring Plungers?

The table on this page lists 8 sizes for Threaded Spring Plungers, ranging from M2 to M20. Sizes outside the table can be quoted on request.

In which materials are Threaded Spring Plungers supplied?

Threaded Spring Plungers are supplied in hardened alloy steel and stainless, with finishes including zinc plating, hot-dip galvanizing and black oxide. Choose material and finish to suit the load and the service environment for Threaded Spring Plungers.

How do I request a quotation?

Use the parametric drawing on this page to set the exact configuration (size, material, finish) and click "Request this configuration" — a specialist from Engineering Hardware will respond within one business day.