Locking Assemblies — Keyless Shaft-Hub Locking Elements

Locking assemblies (locking elements) provide a keyless, friction-locked connection between shaft and hub — eliminating keyways, press fits, and hub machining requirements while providing true zero-backlash torque transmission. AIMS Industrial sells shaft-hub locking assemblies in self-centering and standard configurations for conveyor pulleys, gearboxes, couplings, and heavy industrial drives.

Locking Assemblies We Stock

Type 01 Locking Assembly

The Locking Assembly Type 01 is a standard bore-mounted internal locking assembly suitable for general industrial shaft-hub connections. Tightening the bolt ring grips the shaft OD and hub bore simultaneously — no keyway required in shaft or hub.

Type 02 Self-Centering Locking Assembly

The Locking Assembly Type 02 Self-Centering incorporates a self-centering design that automatically aligns the hub to the shaft centreline during installation — reducing setup time and improving concentric accuracy in precision drive applications.

Type 04 Self-Centering Locking Assembly

The Locking Assembly Type 04 Self-Centering provides a compact self-centering locking solution for applications where radial space is limited. Suitable for conveyor drive pulleys, sprockets, and couplings where hub wall thickness constrains assembly options.

Type 07 Self-Centering Locking Assembly

The Locking Assembly Type 07 Self-Centering is a heavy-duty self-centering locking element for high-torque applications. The double-taper clamping geometry distributes clamping force uniformly around the shaft circumference — maximising the transmittable torque for a given shaft diameter.

Type 19 Self-Centering Locking Assembly

The Locking Assembly Type 19 Self-Centering is designed for applications requiring disassembly under load or in confined spaces. The self-centering feature maintains hub alignment during removal — preventing shaft or bore damage during maintenance.

Large-Bore Locking Assembly

The 180 x 235mm Locking Assembly covers large shaft diameters where standard-range assemblies are insufficient — providing the same zero-backlash keyless connection for heavy mining, quarrying, and large conveyor drive applications.

Locking Assembly Selection & Installation Guide

Torque and Axial Load Capacity

Select the locking assembly size based on both the transmitted torque and axial load from the technical datasheets — not solely on shaft diameter. The bore/shaft diameter determines which assembly fits; the torque and axial load rating determines whether that size is adequate for the application.

Installation Torque — Tighten Evenly

Locking assembly bolts must be tightened evenly (cross-pattern or sequential) to the specified torque to ensure uniform clamping pressure. Uneven tightening causes eccentric clamping that reduces transmitted torque and may cause shaft scoring.

Zero Backlash Advantage

Unlike keyed connections, locking assemblies have zero backlash — the full bore-shaft contact area carries torque by friction without any clearance. This eliminates the fretting wear and impact loading associated with keyway-to-key clearance under reversing or oscillating loads.

Disassembly and Reuse

Locking assemblies can be released and repositioned without shaft or hub damage — unlike interference fits or set-screw collars. This simplifies maintenance alignment adjustments and allows the assembly to be reused after removal, provided it is cleaned and re-lubricated to the manufacturer's specification.

Australian Business, Local Supply: As a proudly Australian business since 1988, we stock locally and work with trusted local Australian manufacturers and distributors to ensure fast, reliable supply.

Expert Support: Need help buying the right product for your application? Contact our team for application-specific advice or request a quote.

Also see our couplings and shaft collars, bearings, and industrial timing belts for complementary power transmission products.