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High-Strength Aluminum Alloy Upper Sleeves

Aluminium upper sleeve: the top element of a stack, where length tolerance controls how the bolt preload is shared between modules.

Key specifications

Material6061-T6 Aluminum Alloy
Installationbolt passes through the sleeve for spacing
StandardGB/T 3191 (aluminium bar), customer drawing
Typical substratebattery packs and lightweight structures
Key inspectionsbore, length, compressive load

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Product overviewOverview

In a bolted joint the sleeve carries the compressive load and fixes the distance between the clamped parts, while keeping the bolt away from the hole wall. In a stack the sleeves in series share one bolt preload, so length tolerance accumulates and the top sleeve sets how evenly the modules are clamped. End faces have to be parallel as well as flat, because a tilted face puts the load on one edge and the stack settles unevenly.

Material: 6061-T6 Aluminum Alloy. The bolt passes through the sleeve to set the spacing.

Key featuresFeatures

Length and face parallelism control how preload is shared in a stack.
Insulation or coating at steel interfaces to suppress galvanic corrosion.
Cut from 6061-T6 bar or extrusion, the sleeve weighs about a third of its steel equivalent and holds dimensions through temperature swings.
The upper sleeve is machined to the stack it sits in, so bore, outside diameter and length all follow the assembly drawing.

Typical applicationsApplications

Motor and inverter mounting isolation
Drone and aerospace frames
Guide bushes on automation

Selection notesSelection

Give a length tolerance for the assembled stack rather than for each sleeve alone; where the stack is long, grade the sleeves by length so the variation is not all in one place.

Frequently asked questionsFAQ

Why does the top sleeve matter more than the others?

It closes the stack. Any accumulated length error shows up there, and because the bolt preload is shared through the whole column, a short or tilted top sleeve changes how the modules below are clamped.

What matters during installation of the High-Strength Aluminum Alloy Upper Sleeves?

Pass the bolt through the sleeve to set the spacing. Length and face parallelism control how preload is shared in a stack.

Specifications

Material	6061-T6 Aluminum Alloy
Standard	GB/T 3191 (aluminium bar), customer drawing
Installation	bolt passes through the sleeve for spacing
Typical substrate	battery packs and lightweight structures
Key inspections	bore, length, compressive load

Manufacturing and inspection

Anodised parts are checked for film thickness and sealing; insulating parts for resistance.Material certificates and dimensional records accompany each lot; material and dimensional records are supplied per batch.