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Threaded Inserts · Trade series (heat-set insert)

M2.5 Heat-Set Threaded Inserts for Plastic Dimensions

Controlling dimensions to Trade series (heat-set insert), with tolerances and fit.

M2.5 Heat-Set Threaded Inserts for Plastic are dimensioned by Trade series (heat-set insert). The controlling dimensions, tolerance classes and assembly data are tabulated below.

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

M2.5 Heat-Set Threaded Inserts for Plastic Dimensions reference image

Dimensional data for M2.5 Heat-Set Threaded Inserts for Plastic to Trade series (heat-set insert), 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.

M2.5 Dimensional Row (Trade series (heat-set insert))

Thread sizeOuter diameter (mm)Length L (mm)Hole in parent (mm)Recommended boss OD (mm)Knurl bandsMaterialInstallation
M2.53.64.03.47.22Brass CuZn39Pb3Heated tip, 200-250 u00b0C

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

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Specification
Business Information

Dimensions & Specifications (Trade series (heat-set insert))

Thread sizeOuter diameter (mm)Length L (mm)Hole in parent (mm)Recommended boss OD (mm)Knurl bandsMaterialInstallation
M23.23.03.06.42Brass CuZn39Pb3Heated tip, 200-250 u00b0C
M2.53.64.03.47.22Brass CuZn39Pb3Heated tip, 200-250 u00b0C
M34.64.04.49.23Brass CuZn39Pb3Heated tip, 200-250 u00b0C
M34.65.74.49.23Brass CuZn39Pb3Heated tip, 200-250 u00b0C
M45.65.75.411.23Brass CuZn39Pb3Heated tip, 200-250 u00b0C
M56.95.86.713.83Brass CuZn39Pb3Heated tip, 200-250 u00b0C
M68.29.58.016.43Brass CuZn39Pb3Heated tip, 200-250 u00b0C

Applications & Industries for M2.5 Heat-Set Threaded Inserts for Plastic

Where Heat-Set Threaded Inserts for Plastic are used, and what decides the specification in each case. Stocked from M2 to M6.

Industries that specify Heat-Set Threaded Inserts for Plastic

  • Additive manufacturing Threads in printed parts, where layer adhesion will not hold a screw.
  • Consumer electronics Housings assembled and re-opened for service.
  • Injection moulding Post-moulded threads in bosses.
  • Prototyping & product development Real threads in a printed prototype.
  • Aluminium & castings Reinforced threads in soft alloy, and repair of stripped holes.
  • Aerospace & motorsport Certified thread repair under vibration and inspection.

Typical applications

  • boss hole size is the critical dimension, not the insert length
  • a reusable metal thread in a plastic or printed boss
  • installed with a heated tip so the plastic flows into the knurl
  • assemblies opened and closed many times over their life
  • creating a reusable metal thread in a soft or thin parent
  • repairing a stripped hole to its original size

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.
Parent material first
The insert type is chosen by what it goes into — moulded plastic, printed polymer, alloy casting or timber — not by the screw that goes into it.

Need help matching Heat-Set Threaded Inserts for Plastic to your application? Send the assembly, the load and the environment with your enquiry and we will specify the size, material and finish against them.

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

Is M2.5 Heat-Set Threaded Inserts for Plastic suitable for electronics and small mechanisms?

M2.5 Heat-Set Threaded Inserts for Plastic 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.

What's the typical proof load behavior of M2.5 class 8.8?

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.

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.