--- title: "What Are Taper Pins Used For?" description: "Taper Pins (ISO 2339 / DIN 1) are used for precise location and light shear duty between two parts. Catalogued 0.6 mm to 50 mm." url: https://engineeringhardware.com/applications/taper-pins/ source: Engineering Hardware & Fasteners --- # What Are Taper Pins Used For? Pins · ISO 2339 / DIN 1 · Application guide Typical applications, the industries that specify taper pins, and how to choose the right size, material and finish for the joint. Taper Pins are used for precise location and light shear duty between two parts. They are manufactured to ISO 2339 / DIN 1, and selection is driven by the nominal diameter, the fit and tolerance the assembly requires, and the service environment. - **Primary duty:** Precise location and light shear duty between two parts - **Governing standard:** ISO 2339 / DIN 1 - **Nominal diameter range:** 0.6 mm to 50 mm - **Category:** Pins Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation. ![What Are Taper Pins Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/06/Taper-Pins-—-ISO-2339-／-DIN-1-Applications1.webp) Taper Pins are used primarily for precise location and light shear duty between two parts. 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 ISO 2339 / DIN 1. Stocked across roughly 0.6 mm to 50 mm, they cover general to heavy-duty work. ## Typical Applications for Taper Pins The most common settings where these are specified: - **Machine alignment:** dowelling mating housings so they reassemble in the same position. - **General machine building:** fastening covers, brackets, motors and sub-assemblies on production equipment. - **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. - **Jigs & fixtures:** precise location of tooling plates and locating features. ## How to Specify Taper Pins for Your Application - **Size:** Select on nominal diameter, then on the hole tolerance and fit class — the fit, not the diameter alone, determines whether the part locates or slips. This product spans 0.6 mm–50 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 ISO 2339 / DIN 1. Quoting the standard on your order guarantees interchangeable dimensions between suppliers. ## Installation & Assembly Practice - Ream the hole to the specified fit class; a dowel pressed into a drilled-only hole will not locate accurately. - Press pins in with steady force rather than hammer blows where possible, and chamfer the hole entry. ## Common Selection Mistakes with Taper Pins - Using a dowel pin as a load-carrying shear bolt — dowels locate, they are not sized for sustained shear. - Ignoring the fit class: a locational fit and an interference fit need different hole tolerances. ## Where Taper Pins Are Not the Right Choice Not for carrying significant tensile or repeated heavy shear loads — use a bolt or a keyed joint for that. Custom manufacturing · Made to drawing ## Need a taper pins outside the standard range? Diameter, length, tolerance class, hardness and end form are specifiable. Ground diameters are held after heat treatment rather than before. Made by cold heading or turning. Minimum order from 2,000 pieces; samples within 7 days of drawing approval. [Custom pin manufacturing](https://engineeringhardware.com/custom/pins/)[Send a drawing](https://engineeringhardware.com/custom/pins/#rfq) ## Technical Drawing Dimensioned line drawing of 0.6 Taper Pins to ISO 2339 / DIN 1. Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected. - **Taper:** 1:50 - **Common length range (mm):** 4~16 - **Material:** Carbon steel / stainless - **Notes:** Large end = small end + length/50 ## Dimensions & Specifications (ISO 2339 / DIN 1) | Small-end diameter (mm) | Taper | Common length range (mm) | Material | Reference standard | Notes | | --- | --- | --- | --- | --- | --- | | 0.6 | 1:50 | 4~16 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 0.8 | 1:50 | 5~20 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 1.0 | 1:50 | 6~25 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 1.2 | 1:50 | 6~25 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 1.5 | 1:50 | 8~32 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 2.0 | 1:50 | 10~45 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 2.5 | 1:50 | 12~50 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 3.0 | 1:50 | 14~55 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 4.0 | 1:50 | 16~70 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 5.0 | 1:50 | 18~90 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 6.0 | 1:50 | 22~110 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 8.0 | 1:50 | 28~140 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 10.0 | 1:50 | 35~180 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 12.0 | 1:50 | 45~200 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 16.0 | 1:50 | 55~200 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 20.0 | 1:50 | 65~200 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 25.0 | 1:50 | 80~200 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 30.0 | 1:50 | 100~200 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 40.0 | 1:50 | 120~200 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | | 50.0 | 1:50 | 160~200 | Carbon steel / stainless | ISO 2339 / DIN 1 (type A) | Large end = small end + length/50 | 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 Taper Pins used for? Precise location and light shear duty between two parts. They are supplied to ISO 2339 / DIN 1. ### Which industries use Taper Pins? 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 Taper Pins? Select on nominal diameter and on the fit the assembly requires. This product is available from 0.6 mm to 50 mm; the full dimension table on this page lists each size. ### What material should Taper Pins 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 Taper Pins 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: [Taper Pins — specifications & sizes](https://engineeringhardware.com/fastener/taper-pins/) ### Taper Pins Specification Guides ### Related Fastener Applications