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Screws · Trade series (oval sheet-metal screws) · Application guide

What Are Oval-Head Sheet-Metal Screws Used For?

Typical applications, the industries that specify oval-head sheet-metal screws, and how to choose the right size, material and finish for the joint.

Oval-Head Sheet-Metal Screws are used for forming a thread in sheet metal while retaining an oval head that sits into a shallow countersink. They are manufactured to Trade series (oval sheet-metal screws), and selection is driven by the screw size, the fit and tolerance the assembly requires, and the service environment.

Primary duty
Forming a thread in sheet metal while retaining an oval head that sits into a shallow countersink
Governing standard
Trade series (oval sheet-metal screws)
Screw size range
#4 to #6
Category
Screws

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

What Are Oval-Head Sheet-Metal Screws Used For? application image

The primary duty of Oval-Head Sheet-Metal Screws is forming a thread in sheet metal while retaining an oval head that sits into a shallow countersink. Below: the sectors that specify them in volume, the checklist used to select the right size and material for the application, installation notes, and the known limits of the type. Stocked across roughly 4 to 6, they cover light-duty and instrument-scale work.

Typical Applications for Oval-Head Sheet-Metal Screws

The most common settings where these are specified:

  • Sheet-metal panels: Oval pointed screws fasten thin sheet with a finished raised head.
  • Appliance trim: 18-8 stainless resists corrosion on visible light-gauge panels.
  • Enclosures: No. 1 and No. 2 drives fit the supplied small sizes.
  • Light fabrication: The 82-degree seat is chosen where a flat appearance matters.

How to Specify Oval-Head Sheet-Metal Screws for Your Application

  • Size: Match the nominal size to the mating thread or hole. This product spans 4–6; check the full table below for the exact dimensions of each size.
  • 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 (oval sheet-metal 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 Oval-Head Sheet-Metal 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 Oval-Head Sheet-Metal 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 (oval sheet-metal screws))

Size exampleHead diameter (in)Head height (in)DriveThread pitchLength options (in)Material
#40.2120.104No. 124 TPI3/8~118-8 stainless steel
#60.2620.128No. 218 TPI3/8~118-8 stainless steel
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 Oval-Head Sheet-Metal 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 Oval-Head Sheet-Metal 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 Oval-Head Sheet-Metal Screws made to a recognized standard?

Yes — they are manufactured to Trade series (oval sheet-metal screws), so dimensions are interchangeable between suppliers when you quote the standard on your order.

What are Oval-Head Sheet-Metal Screws used for?

Forming a thread in sheet metal while retaining an oval head that sits into a shallow countersink. They are supplied to Trade series (oval sheet-metal screws).

Can I get a quote for Oval-Head Sheet-Metal 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.