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Washers · ASTM F436 · Application guide

What Are Structural Washers, Hardened (ASTM F436) Used For?

Typical applications, the industries that specify structural washers, hardened (astm f436), and how to choose the right size, material and finish for the joint.

Structural Washers, Hardened (ASTM F436) are used for high-strength structural bolting, where a soft washer would brinell into the plate and the connection would lose its preload. They are manufactured to ASTM F436, and selection is driven by the screw size, the fit and tolerance the assembly requires, and the service environment.

Primary duty
High-strength structural bolting, where a soft washer would brinell into the plate and the connection would lose its preload
Governing standard
ASTM F436
Screw size range
1" to 7/8"
Category
Washers

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

What Are Structural Washers, Hardened (ASTM F436) Used For? application image

Structural Washers, Hardened (ASTM F436) are used primarily for high-strength structural bolting, where a soft washer would brinell into the plate and the connection would lose its preload. 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 ASTM F436. Stocked across roughly 1 to 7, they cover general to heavy-duty work.

Typical Applications for Structural Washers, Hardened (ASTM F436)

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.
  • Bolted structural joints: spreading load over soft or oversized holes and protecting the surface.
  • Vibration applications: spring and serrated types that maintain tension under cyclic load.
  • Timber & soft materials: large-OD types that prevent pull-through.

How to Specify Structural Washers, Hardened (ASTM F436) for Your Application

  • Size: Match the nominal size to the mating thread or hole. This product spans 1–7; check the full table below for the exact dimensions of each size.
  • Type & OD: Select flat for load spreading, spring/serrated for anti-loosening, or fender/large-OD for soft or oversized holes.
  • 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 ASTM F436. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

Installation & Assembly Practice

  • Place the washer under the rotating element (usually the nut) so tightening does not score the surface.
  • Chamfered-hole side of a hardened washer faces the bolt head fillet.
  • On serrated-flange hardware, do not add a plain washer — it defeats the serrations.

Common Selection Mistakes with Structural Washers, Hardened (ASTM F436)

  • Relying on a spring washer for locking on class 8.8+ joints — at high preload it flattens and adds nothing.
  • Choosing an OD too small for soft material, so the head pulls through or embeds.

Where Structural Washers, Hardened (ASTM F436) Are Not the Right Choice

A washer does not replace a locking feature on its own in severe vibration, and a spring washer adds little clamp on high-strength joints.

Custom manufacturing · Made to drawing

Need a structural washers, hardened (astm F436) outside the standard range?

Bearing area is usually the reason for a special washer: a larger outside diameter to spread load into a softer material, or a thicker section to resist dishing. Made by stamping or punching.

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

Custom washer 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 1/2" Structural Washers, Hardened (ASTM F436) to ASTM F436. Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.
Inner diameter (in)
17/32
Outer diameter (in)
1.062
Thickness (in)
0.122
Hardness (HRC)
38-45
Type
Type 1 circular
Finish
Plain / HDG
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 (ASTM F436)

For bolt sizeInner diameter (in)Outer diameter (in)Thickness (in)Hardness (HRC)TypeFinishReference standard
1/2"17/321.0620.12238-45Type 1 circularPlain / HDGASTM F436
5/8"11/161.3120.12238-45Type 1 circularPlain / HDGASTM F436
3/4"13/161.4690.12238-45Type 1 circularPlain / HDGASTM F436
7/8"15/161.7500.12238-45Type 1 circularPlain / HDGASTM F436
1"1-1/162.0000.13638-45Type 1 circularPlain / HDGASTM F436
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 Structural Washers, Hardened (ASTM F436)?

They are commonly specified in bolted structural joints, vibration applications and timber & soft materials, among other sectors.

How do I choose the right size of Structural Washers, Hardened (ASTM F436)?

Match the nominal size to the mating thread or hole. This product is available from 1 to 7; the full dimension table on this page lists each size.

Do Structural Washers, Hardened (ASTM F436) actually stop bolts loosening?

Spring and serrated washers help maintain tension under light vibration, but for critical joints a prevailing-torque locking nut or adhesive is more reliable. Flat washers mainly spread load and protect the surface.

What material should Structural Washers, Hardened (ASTM F436) 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 Structural Washers, Hardened (ASTM F436) 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.