Controlling dimensions to Trade series (GN 615), with tolerances and fit.
M4 Threaded Spring Plungers dimensions to Trade series (GN 615): coarse thread pitch 0.7 mm.
Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.
The M4 size of Threaded Spring Plungers is dimensioned by Trade series (GN 615). The table below gives the dimensional row from the standard, followed by the installation notes for this type.
| Thread size | Plunger types | Housing material | Ball material | Spring material |
|---|---|---|---|---|
| M4 | K / KS / KN / KSN | blackened steel or AISI 303 stainless | hardened steel or AISI 420C stainless | AISI 631 |
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.
The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.
| Thread size | Plunger types | Housing material | Ball material | Spring material |
|---|---|---|---|---|
| M2 | K / KS / KN / KSN | blackened steel or AISI 303 stainless | hardened steel or AISI 420C stainless | AISI 631 |
| M3 | K / KS / KN / KSN | blackened steel or AISI 303 stainless | hardened steel or AISI 420C stainless | AISI 631 |
| M4 | K / KS / KN / KSN | blackened steel or AISI 303 stainless | hardened steel or AISI 420C stainless | AISI 631 |
| M5 | K / KS / KN / KSN | blackened steel or AISI 303 stainless | hardened steel or AISI 420C stainless | AISI 631 |
| M6 | K / KS / KN / KSN | blackened steel or AISI 303 stainless | hardened steel or AISI 420C stainless | AISI 631 |
| M8 | K / KS / KN / KSN | blackened steel or AISI 303 stainless | hardened steel or AISI 420C stainless | AISI 631 |
| M12 | K / KS / KN / KSN | blackened steel or AISI 303 stainless | hardened steel or AISI 420C stainless | AISI 631 |
| M20 | K / KS / KN / KSN | blackened steel or AISI 303 stainless | hardened steel or AISI 420C stainless | AISI 631 |
What Threaded Spring Plungers are specified for, industry by industry. Stocked from M2 to M20.
This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.
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.
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.
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.
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.
M4 Threaded Spring Plungers is in the micro range and is widely used in electronics, instrument enclosures and small precision mechanisms. Watch the over-torque margin — micro joints strip easily.
Micro-thread joints are sensitive to plastic deformation in the first turn under load — use a torque-limiting driver and check the bearing surface deformation on softer mating materials.
For M4 the standard coarse pitch is 0.7 mm — this is the value used for Threaded Spring Plungers.
Use a 4.5 mm clearance hole (ISO 273 medium) for through-fixing, or a 3.3 mm tapping drill for a coarse M4 thread.
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.