Machined aluminium tube connector with a flanged shoulder stepped spigot and a cross hole.

Aluminium Clamping Components

Aluminium Tube Connector

Name: Aluminium Tube Connector
Brand: Yiwu Hongpin Mechanical Equipment Company

A flanged spigot that plugs into a tube end and gives the assembly a shoulder to register against.

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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

The connector is turned with a spigot that enters the tube bore and a flange that stops against the tube end face. A cross hole through the spigot takes a roll pin or a fastener so the connector cannot back out or rotate. It turns an open tube end into a defined mechanical interface, which is what you need when the tube has to carry a load rather than just enclose something.

Key Benefits

Why It Is Made This Way

A real shoulder to register againstThe flange sets axial position, so the joint repeats every time it is assembled.
Cross-pinned against rotationThe cross hole takes a pin, so torque does not work the joint loose.
Spigot cut to your tube boreA slip fit or an interference fit, whichever the drawing calls for.
Serviceable jointDrive the pin out and the assembly comes apart without damage.

Problems It Solves

What Goes Wrong Without It

Open tube ends have no datumWithout a flange, axial position is set by whatever the tube happens to bottom against.
Pressed joints work looseAn interference fit alone relaxes under thermal cycling and vibration; a cross pin does not.
Glued joints cannot be servicedA pinned connector can be taken apart and put back together.

Application Scenarios

Where It Is Used

Closing out a tube end and giving it a mounting face
Joining a tube to a machined housing or a cast bracket
Transmitting torque from a tube to a shaft through a cross pin
Providing a threaded or pinned interface on a tubular frame member

Who It Is For

Who Specifies It

Engineers designing tubular structures and handheld assemblies who need the tube end turned into a defined interface rather than left open.

Related Capability

Technical Features

How It Is Made

ProcessCNC turning with cross drilling in a second operation
GeometryFlanged shoulder, stepped spigot, transverse cross hole, chamfered lead-in
MaterialAluminium alloy as shown; stainless steel and engineering plastic to the same print
FinishAs-machined; anodising or passivation on request

Specifications

Specification Table

Spigot diameter and fit	To drawing, against your tube bore
Flange diameter and thickness	To drawing
Cross hole diameter and position	To drawing, matched to your pin
Tolerance	Confirmed per project against your print
Material	Aluminium alloy, stainless steel or engineering plastic
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 welding a plug into the tube, a pinned connector is serviceable and does not distort the tube with heat. Against a plastic push-in plug it carries real load and holds position. Against a grub screw in the tube wall it does not dimple the tube and it locates axially as well as radially.

Use Guide

Deburr the tube bore and the tube end face before fitting.
Push the spigot home until the flange contacts the tube end all the way round.
Drill through the tube using the connector cross hole as the guide only if the drawing says so; otherwise use the pre-drilled tube.
Drive the pin with a pin punch, supporting the tube so it is not deformed.

Questions

Questions About The Aluminium Tube Connector

Can the spigot be threaded instead of pinned?

Yes. Thread the spigot, the bore, or both, and the cross hole can be dropped. Put the thread callout on the drawing including the class.

Slip fit or interference fit?

Both are machined routinely. State the fit on the print, or state the tube bore and its tolerance and the fit you want, and the spigot will be sized to it.

Can you supply the cross pin as well?

Roll pins and dowel pins are a stock item and can be quoted alongside the connector so the pair arrives together.

Does anodising affect the fit?

Yes. Anodising grows the surface, so the spigot is machined undersize by the coating allowance when the drawing calls for a coated interference fit.

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Engineering Notes

A range of machined parts of the type quoted from customer drawings

What to Include in a Machining RFQ

The six items that let a supplier quote accurately and the one that usually sets the price.

Read The Note

Quote The Aluminium Tube Connector

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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