What is a Dowel Pin? Applications, Types, and Selection Guide

In industrial manufacturing, automation equipment, and various mechanical assemblies, dowel pins—also known as locating pins—are small components that are often overlooked.

Despite their compact size, they play a vital role in securing, positioning, and absorbing shear forces.

This guide will help engineers and buyers understand the definition of dowel pins, choose the right material, learn about common classifications, and make informed purchasing decisions.

--

3 Core Functions of Dowel Pins

• Precise Positioning – Ensures consistent alignment of workpieces

• Shear Force Absorption – Works with screws to enhance structural strength

• Repeatable Assembly – Facilitates easy maintenance and repair

--

Common Classifications and Specifications

Classification Basis	Common Types	Description
Material	Stainless steel (SUS304, 316), carbon steel, brass, aluminum, PEEK	Selected based on corrosion resistance and strength
Surface Treatment	Electroplating, black oxide, electroless nickel plating, passivation	Enhances corrosion resistance and fit precision
Size & Standards	Metric/Inch, diameter Ø1–Ø20 mm, customizable lengths	Fits with hole tolerances (recommended H7/m6)

Common Standards: DIN 7, ISO 2338, ISO 8734, DIN 6325

--

Selection Tips Choose SUS304 / 316 for automation and semiconductor applications

• Use carbon steel with heat treatment for high-shear-load structures

• Pair H7 hole tolerance with m6 dowel pin for precision assemblies

• For frequent removal, consider slotted or spring dowel pins

--

Why Choose Sheng Fong Precision as Your Dowel Pin Supplier?

• ✅ Multiple sizes in stock, small orders welcome

• ✅ Customizable materials, sizes, and surface treatments

• ✅ One-stop supply for dowel pins, screws, and washers—saving time and effort

📩 Need dowel pins? Contact us on LINE (ID: @s9000)