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Standoffs & Spacers · Trade series (captive tack pins) · Application guide

What Are Low-Profile Captive Pins Used For?

Typical applications, the industries that specify low-profile captive pins, and how to choose the right size, material and finish for the joint.

Low-Profile Captive Pins are used for providing a permanently captive locating pin in a thin panel without losing the low-profile head. They are manufactured to Trade series (captive tack pins), and selection is driven by the size designation, the fit and tolerance the assembly requires, and the service environment.

Primary duty
Providing a permanently captive locating pin in a thin panel without losing the low-profile head
Governing standard
Trade series (captive tack pins)
Size designation range
T4-10-025 to TA-10-025
Category
Standoffs & Spacers

Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation.

What Are Low-Profile Captive Pins Used For? application image

Low-Profile Captive Pins (Trade series (captive tack pins)) are specified where the joint requires providing a permanently captive locating pin in a thin panel without losing the low-profile head. The sections below cover the typical end-uses by industry, the size and material decisions for each, assembly practice, and the applications this fastener type is not suited to. Stocked across roughly 4 to 10, they cover general to heavy-duty work.

Typical Applications for Low-Profile Captive Pins

The most common settings where these are specified:

  • Thin sheet panels: Low-profile captive pins stay attached to panels only a few thousandths of an inch thick.
  • Circuit boards: Small stainless or aluminum pins support repeatable positioning.
  • Electronics housings: The head height leaves minimal projection above the panel.
  • Instrument assemblies: Captive hardware prevents a pin from being lost during service.

How to Specify Low-Profile Captive Pins for Your Application

  • Size: Match the nominal size to the mating thread or hole. This product spans 4–10; check the full table below for the exact dimensions of each size.
  • Material: Choose the material and finish for the service environment — plated steel for general use, stainless for corrosion resistance.
  • Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
  • Standard: This product is supplied to Trade series (captive tack pins). Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

Where Low-Profile Captive Pins Are Not the Right Choice

Match the fastener to the load, environment and whether the joint must be reopened; the wrong class or style is the usual cause of joint failure.

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 Quote

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 (captive tack pins))

Part formPin diameter (in)Pin length (in)Head diameter (in)Head height (in)Panel thickness (in)Installation hole (in)Material
T4-10-0250.0510.0400.0790.0080.008~0.011; minimum 0.0350.051400-series stainless steel
TA-10-0250.0510.0400.0790.0080.008~0.011; minimum 0.0350.051aluminum
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

Which industries use Low-Profile Captive Pins?

They are commonly specified in thin sheet panels, circuit boards and electronics housings, among other sectors.

How do I choose the right size of Low-Profile Captive Pins?

Match the nominal size to the mating thread or hole. This product is available from 4 to 10; the full dimension table on this page lists each size.

What material should Low-Profile Captive Pins be for outdoor use?

For damp, coastal or chemical environments specify A4 (316) stainless or a suitably coated steel. For indoor or dry use, A2 (304) stainless or zinc-plated steel is normally adequate.

Are Low-Profile Captive Pins made to a recognized standard?

Yes — they are manufactured to Trade series (captive tack pins), so dimensions are interchangeable between suppliers when you quote the standard on your order.

Can I get a quote for Low-Profile Captive Pins in the size and material I need?

Yes. Use the technical drawing and quote form on this page to set the size and options, then send the exact configuration to our team for pricing and lead time.