Three stainless steel headed pins with long plain shanks and formed heads.

Springs and Fasteners

Rivets and Dowel Pins

Name: Rivets and Dowel Pins
Brand: Yiwu Hongpin Mechanical Equipment Company

Headed pins and solid rivets turned to drawing, for joints that have to locate as well as fasten.

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Made to your drawing. Every dimension below that depends on your print is marked To drawing rather than given a number that would only be a guess.

Overview

What This Part Does

A dowel pin locates. A rivet fastens. The parts in this family do both, and what they have in common is that the shank diameter and its finish are the working surface, not an afterthought. Hongpin turns headed pins, solid rivets and plain dowels to customer drawings, including long shank lengths where a stock pin does not exist in the size the assembly needs.

Key Benefits

Why It Is Made This Way

Shank diameter is the working dimensionLocating accuracy comes from the shank fit, which is machined to the print.
Head form to drawingHead diameter, height and profile follow your joint, not a fastener standard that nearly fits.
Long shanks availableLengths that fall outside stock ranges are machined rather than compromised.
Stainless for corrosionPins that live in a washdown environment can be made in stainless rather than plated.

Problems It Solves

What Goes Wrong Without It

Stock pins do not come long enoughA pin that is 2 mm short is not a pin that fits.
Plated pins corrode at the headWhere washdown is involved, solid stainless outlasts a plated carbon steel pin.
Bolts are being asked to locateA bolt in a clearance hole cannot locate. A dowel pin can, and it lets the bolts do what they are good at.

Application Scenarios

Where It Is Used

Locating two machined plates to each other before they are bolted
Acting as a pivot pin in a lever or a linkage
Cross-pinning a connector or a collar onto a shaft or a tube
Permanently fastening a joint that will not be dismantled

Who It Is For

Who Specifies It

Fixture builders and machine designers who need locating pins in sizes and lengths that stock ranges do not cover.

Related Capability

Technical Features

How It Is Made

ProcessCNC turning, with head forming and any secondary features to drawing
GeometryHeaded or plain, chamfered or radiused lead-in, cross holes or grooves to drawing
MaterialStainless steel as shown; other materials to the same print
FinishAs-machined unless the drawing specifies

Specifications

Specification Table

Shank diameter	To drawing
Shank length	To drawing
Head diameter and height	To drawing
Shank tolerance and fit	Confirmed per project against your print
Material	Stainless steel or to drawing
Finish	As-machined unless specified
Minimum order	Confirmed per project

Values marked to drawing or confirmed per project are set against your print at quotation. No certification, capacity or tolerance figures are published because none were published by the business.

Comparison

How It Compares

Against a bolt, a dowel pin locates precisely but carries no clamping load, which is why the two are normally used together. Against a roll pin, a solid turned pin locates far more accurately but needs a more accurate hole. Against a stock catalogue pin, a turned pin gives you the length and head you need.

Use Guide

Prepare the hole to the specified size and finish; the pin can only be as accurate as the hole.
Press pins in squarely with a support underneath, and never hammer directly on the head.
Use dowels to locate and bolts to clamp; do not expect either to do the other job.
Where a joint is taken apart regularly, keep one hole a slip fit so the pin stays with one half.

Questions

Questions About The Rivets and Dowel Pins

What is the difference between a dowel pin and a locating pin here?

Function rather than family. A dowel is a plain cylindrical pin used as a locator; a headed pin does the same job but cannot fall through. The drawing decides which you get.

Interference fit or slip fit in the hole?

Normally one plate takes the pin as an interference fit and the other as a slip fit, so the joint can still be taken apart. State which hole is which on the print.

Can you make pins to replace an obsolete size?

Yes. Give the measured shank diameter and length from the old pin plus the hole sizes, and the replacement can be machined to suit the holes you actually have.

Do you supply the matching reamer size?

Not as a product, but the shank tolerance will be machined to whatever hole preparation you specify. Say what you are reaming to and the pin will be made against it.

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Engineering Notes

Machined locating and clamping components of the type used to build production fixtures

How to Specify a Production Fixture

What a fixture supplier actually needs from you and the four decisions that set the cost.

Read The Note

Quote The Rivets and Dowel Pins

Send the drawing with tolerances, the material and the quantity. Say what the part fits against and any tolerance that is doing no work will be flagged before it is priced.

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