--- title: "What Are Fully-Threaded Standoff Caps Used For?" description: "Fully-Threaded Standoff Caps (Trade series (fully threaded standoff caps)) are used for holding a board or panel above a mating surface with a fully threaded…" url: https://engineeringhardware.com/applications/fully-threaded-standoff-caps/ source: Engineering Hardware & Fasteners --- # What Are Fully-Threaded Standoff Caps Used For? Standoffs & Spacers · Trade series (fully threaded standoff caps) · Application guide Typical applications, the industries that specify fully-threaded standoff caps, and how to choose the right size, material and finish for the joint. Fully-Threaded Standoff Caps are used for holding a board or panel above a mating surface with a fully threaded standoff body. They are manufactured to Trade series (fully threaded standoff caps), and selection is driven by the nominal diameter, the fit and tolerance the assembly requires, and the service environment. - **Primary duty:** Holding a board or panel above a mating surface with a fully threaded standoff body - **Governing standard:** Trade series (fully threaded standoff caps) - **Nominal diameter range:** 4-40 to 10-32 - **Category:** Standoffs & Spacers Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation. ![What Are Fully-Threaded Standoff Caps Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Fully-Threaded-Standoff-Caps.webp) Fully-Threaded Standoff Caps are used primarily for holding a board or panel above a mating surface with a fully threaded standoff body. 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 (fully threaded standoff caps). Stocked across roughly 4 mm to 10 mm, they cover general to heavy-duty work. ## Typical Applications for Fully-Threaded Standoff Caps The most common settings where these are specified: - **Electronics enclosures:** Threaded caps finish a standoff and protect the open thread. - **Instrument panels:** Zinc-plated brass covers a small exposed thread without adding a large head. - **Display hardware:** The cap form keeps debris out of a spacer assembly. - **Prototype fixtures:** 4-40 through 10-32 sizes close off unused standoff ends. 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This product spans 4 mm–10 mm; 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 (fully threaded standoff caps). Quoting the standard on your order guarantees interchangeable dimensions between suppliers. ## Where Fully-Threaded Standoff Caps 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 fully-threaded standoff caps 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 manufacturing](https://engineeringhardware.com/custom/standoffs-spacers/)[Send a drawing](https://engineeringhardware.com/custom/standoffs-spacers/#rfq) ## Technical Drawing Dimensioned line drawing of 4-40 Fully-Threaded Standoff Caps to Trade series (fully threaded standoff caps). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected. - **Outside diameter (in):** 1/4 - **Cap height (in):** 1/4 - **Thread length (in):** 3/8 - **Material:** zinc-plated brass - **Form:** fully threaded cap ## Dimensions & Specifications (Trade series (fully threaded standoff caps)) | Thread size | Outside diameter (in) | Cap height (in) | Thread length (in) | Material | Form | | --- | --- | --- | --- | --- | --- | | 4-40 | 1/4 | 1/4 | 3/8 | zinc-plated brass | fully threaded cap | | 6-32 | 1/4 | 1/4 | 3/8 | zinc-plated brass | fully threaded cap | | 8-32 | 1/4 | 1/4 | 3/8 | zinc-plated brass | fully threaded cap | | 10-32 | 1/4 | 1/4 | 3/8 | zinc-plated brass | fully threaded cap | 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](https://engineeringhardware.com/wp-content/uploads/2026/08/09-wire-rod-feed-cold-heading-machine.webp) 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](https://engineeringhardware.com/wp-content/uploads/2026/08/03-thread-rolling-machine-bolt-production.webp) 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](https://engineeringhardware.com/wp-content/uploads/2026/08/05-heat-treatment-baskets-black-bolts.webp) 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](https://engineeringhardware.com/wp-content/uploads/2026/08/23-zinc-plated-bolts-treatment-basket.webp) 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 Fully-Threaded Standoff Caps used for? Holding a board or panel above a mating surface with a fully threaded standoff body. They are supplied to Trade series (fully threaded standoff caps). ### Which industries use Fully-Threaded Standoff Caps? They are commonly specified in display hardware, prototype fixtures and electronics enclosures, among other sectors. ### How do I choose the right size of Fully-Threaded Standoff Caps? Match the nominal size to the mating thread or hole. This product is available from 4 mm to 10 mm; the full dimension table on this page lists each size. ### What material should Fully-Threaded Standoff Caps 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 Fully-Threaded Standoff Caps 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. ## Related Pages Product page: [Fully-Threaded Standoff Caps — specifications & sizes](https://engineeringhardware.com/fastener/fully-threaded-standoff-caps/) ### Fully-Threaded Standoff Caps Specification Guides ### Related Fastener Applications