Controlling dimensions to Trade series (GN 615.8), with tolerances and fit.
M8 Friction-Bearing Ball Spring Plungers dimensions to Trade series (GN 615.8): 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.
The M8 size of Friction-Bearing Ball Spring Plungers is dimensioned by Trade series (GN 615.8). The table below gives the dimensional row from the standard, followed by the installation notes for this type.
| Thread size | Length L (mm) | Ball diameter (mm) | Standard spring initial/end load (N) | High-load spring initial/end load (N) | Housing material |
|---|---|---|---|---|---|
| M8 | 16 | 3.5 | 16 / 24 | 23 / 40 | blackened steel or AISI 303 stainless |
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 | Length L (mm) | Ball diameter (mm) | Standard spring initial/end load (N) | High-load spring initial/end load (N) | Housing material |
|---|---|---|---|---|---|
| M5 | 12 | 2 | 4.8 / 6.8 | 10 / 14 | blackened steel or AISI 303 stainless |
| M6 | 14 | 2.5 | 6.3 / 10 | 11 / 16 | blackened steel or AISI 303 stainless |
| M8 | 16 | 3.5 | 16 / 24 | 23 / 40 | blackened steel or AISI 303 stainless |
| M10 | 19 | 4.5 | 18.8 / 31.7 | 28 / 54.3 | blackened steel or AISI 303 stainless |
| M12 | 22 | 6.5 | 26 / 49 | 39.5 / 77.3 | blackened steel or AISI 303 stainless |
| M16 | 24 | 8.5 | 38 / 68 | 50 / 88.7 | blackened steel or AISI 303 stainless |
What Friction-Bearing Ball Spring Plungers are specified for, industry by industry. Stocked from M5 to M16.
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.
For M8 the standard coarse pitch is 1.25 mm — this is the value used for Friction-Bearing Ball Spring Plungers.
Use a 9 mm clearance hole (ISO 273 medium) for through-fixing, or a 6.8 mm tapping drill for a coarse M8 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.