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Pins · Trade series (GN 615)

M8 Threaded Spring Plungers Dimensions

Controlling dimensions to Trade series (GN 615), with tolerances and fit.

M8 Threaded Spring Plungers dimensions to Trade series (GN 615): coarse thread pitch 1.25 mm.

Coarse thread pitch
1.25 mm

Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.

M8 Threaded Spring Plungers Dimensions reference image

Dimensional data for M8 Threaded Spring Plungers to Trade series (GN 615), with the installation notes for this type. Values are taken from the governing standard rather than from a general machine-thread table, because this type is not selected on one.

M8 Dimensional Row (Trade series (GN 615))

Thread sizePlunger typesHousing materialBall materialSpring material
M8K / KS / KN / KSNblackened steel or AISI 303 stainlesshardened steel or AISI 420C stainlessAISI 631

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.

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Specification
Business Information

Dimensions & Specifications (Trade series (GN 615))

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

Applications & Industries for M8 Threaded Spring Plungers

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

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.

Frequently Asked Questions

What clearance and tapping drill suit M8?

Use a 9 mm clearance hole (ISO 273 medium) for through-fixing, or a 6.8 mm tapping drill for a coarse M8 thread.

What is the coarse-thread pitch of M8 for Threaded Spring Plungers?

For M8 the standard coarse pitch is 1.25 mm — this is the value used for Threaded Spring Plungers.

How do I request a quotation?

Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.