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Screws · Trade series (hex washer flange self-drilling screws) · Application guide

What Are Hex Washer Flange Self-Drilling Screws Used For?

Typical applications, the industries that specify hex washer flange self-drilling screws, and how to choose the right size, material and finish for the joint.

Hex Washer Flange Self-Drilling Screws are used for fixing into sheet, timber or plastic by forming their own thread as they are driven, without a tapped hole. They are manufactured to Trade series (hex washer flange self-drilling screws), and selection is driven by the screw size, the fit and tolerance the assembly requires, and the service environment.

Primary duty
Fixing into sheet, timber or plastic by forming their own thread as they are driven, without a tapped hole
Governing standard
Trade series (hex washer flange self-drilling screws)
Category
Screws

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

What Are Hex Washer Flange Self-Drilling Screws Used For? application image

Hex Washer Flange Self-Drilling Screws are used primarily for fixing into sheet, timber or plastic by forming their own thread as they are driven, without a tapped hole. 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 Trade series (hex washer flange self-drilling screws).

Typical Applications for Hex Washer Flange Self-Drilling Screws

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 & enclosures: mounting PCBs, panels and lids where the drive style and head height matter.
  • Appliances & consumer goods: high-volume assembly with power tools and consistent seating.
  • Machine guarding & panels: removable access covers that are opened for service.

How to Specify Hex Washer Flange Self-Drilling Screws for Your Application

  • Size: Match the size to the mating part — see the dimension table below for each option.
  • Drive & head: Pick the drive (socket, cross, slot) and head style for the tool access and seating surface; a recessed drive resists cam-out under power tools.
  • 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 (hex washer flange self-drilling screws). Quoting the standard on your order guarantees interchangeable dimensions between suppliers.

Installation & Assembly Practice

  • Match the driver exactly to the recess (PH ≠ PZ; hex key sizes per ISO 2936) and keep the tool axial — side load is the main cause of stripped drives.
  • In tapped holes, engage a thread length of at least 1× the nominal diameter in steel, 2× in aluminum.
  • Set power tools to a torque that seats the head without embedding it into the mating surface.

Common Selection Mistakes with Hex Washer Flange Self-Drilling Screws

  • Under-sizing the drive for the installation torque — a small recess at high torque strips before the screw is seated.
  • Using a countersunk head in thin sheet where the countersink removes most of the load-bearing material.
  • Specifying stainless in high-strength duty: A2-70 is roughly class 7 steel, not a 10.9 substitute.

Where Hex Washer Flange Self-Drilling Screws Are Not the Right Choice

Not for high-preload structural joints (use a property-class bolt and nut), and not in thin sheet where a self-drilling or self-tapping type suits better.

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 (hex washer flange self-drilling screws))

Head formBearing surfacePointSubstrateTypical use
hex washer headintegral flangeintegrated drill pointmetal sheetmetal roofing and cladding
hex washer headintegral flangeintegrated drill pointthin structural memberssolar mounting brackets
hex washer headintegral flangeintegrated drill pointstructural steel to sheetstructural assemblies
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 drive type do Hex Washer Flange Self-Drilling Screws use?

Drive depends on the head style — socket (hex key), cross (Phillips/Pozi) or slot. A recessed drive resists cam-out when driven with power tools; check the product head style on this page.

What material should Hex Washer Flange Self-Drilling Screws 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 Hex Washer Flange Self-Drilling Screws made to a recognized standard?

Yes — they are manufactured to Trade series (hex washer flange self-drilling screws), so dimensions are interchangeable between suppliers when you quote the standard on your order.

What are Hex Washer Flange Self-Drilling Screws used for?

Fixing into sheet, timber or plastic by forming their own thread as they are driven, without a tapped hole. They are supplied to Trade series (hex washer flange self-drilling screws).

Can I get a quote for Hex Washer Flange Self-Drilling Screws 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.