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Standoffs & Spacers · Industry standard · Application guide

What Are Hex Standoffs, Female-Female Used For?

Typical applications, the industries that specify hex standoffs, female-female, and how to choose the right size, material and finish for the joint.

Hex Standoffs, Female-Female are used for setting a fixed gap between two boards or panels and carrying the screws that hold them, in compression rather than in clamp load. They are manufactured to Industry standard, and selection is driven by the thread size, the fit and tolerance the assembly requires, and the service environment.

Primary duty
Setting a fixed gap between two boards or panels and carrying the screws that hold them, in compression rather than in clamp load
Governing standard
Industry standard
Thread size range
M2.5 to M10
Category
Standoffs & Spacers

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

What Are Hex Standoffs, Female-Female Used For? application image

Hex Standoffs, Female-Female are used primarily for setting a fixed gap between two boards or panels and carrying the screws that hold them, in compression rather than in clamp load. This page lists the industries and assemblies where they are specified, the selection criteria that matter for each application, installation practice, and the cases where a different fastener type is the correct choice. Parts are supplied to Industry standard. Stocked across roughly M2.5 to M10, they cover general to heavy-duty work.

Typical Applications for Hex Standoffs, Female-Female

The most common settings where these are specified:

  • Maintenance & repair (MRO): a stocked size for servicing existing plant where the original fastener spec must be matched.
  • Fabrication & metalwork: bench and on-site assembly of steel frames, enclosures and weldments.
  • Electronics assembly: holding boards off a chassis and stacking multiple boards at a fixed pitch.
  • Enclosures & panels: spacing a fascia, guard or label plate off the surface behind it.
  • Machine alignment: setting and correcting the height of a component on its mounting.

How to Specify Hex Standoffs, Female-Female for Your Application

  • Size: Match the nominal size to the mating thread or hole. This product spans M2.5–M10; 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 is a trade-series article rather than one covered by a published dimensional standard, so dimensions can differ between manufacturers. Quote the dimensions you need — or the part you are replacing — rather than a standard number.

Where Hex Standoffs, Female-Female 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.

Custom manufacturing · Made to drawing

Need a hex standoffs, female-female outside the standard range?

A non-standard standoff & spacer is quoted from the drawing; where one already exists in the catalog, the special is usually a variation on its tooling. Made by tapping or turning.

Minimum order from 2,000 pieces; samples within 7 days of drawing approval.

Custom standoff & spacer manufacturingSend a drawing

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.

Dimensioned line drawing of M2.5 Hex Standoffs, Female-Female to Industry standard. Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.
Pitch (mm)
0.45
Across flats s (mm)
5
Across corners e (mm)
5.8
Length range L (mm)
5~40
Thread depth each end (mm)
5
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.

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Specification
Business Information

Dimensions & Specifications (Industry standard)

Thread sizePitch (mm)Across flats s (mm)Across corners e (mm)Length range L (mm)Thread depth each end (mm)Reference standard
M2.50.4555.85~405Industry standard
M30.55.56.45~506Industry standard
M40.778.16~608Industry standard
M50.889.28~8010Industry standard
M61.01011.510~10012Industry standard
M81.251315.012~10016Industry standard
M101.51719.615~10020Industry standard

Video: What Are Hex Standoffs, Female-Female Used For? in use

Third-party video, selected automatically for this topic. It is not produced by Engineering Hardware and is not a specification source — use the tables on this page for dimensional data.

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 are Hex Standoffs, Female-Female used for?

Setting a fixed gap between two boards or panels and carrying the screws that hold them, in compression rather than in clamp load. They are supplied to Industry standard.

Which industries use Hex Standoffs, Female-Female?

They are commonly specified in machine alignment, general machine building and maintenance & repair (mro), among other sectors.

How do I choose the right size of Hex Standoffs, Female-Female?

Match the nominal size to the mating thread or hole. This product is available from M2.5 to M10; the full dimension table on this page lists each size.

What material should Hex Standoffs, Female-Female 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.

Can I get a quote for Hex Standoffs, Female-Female 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.