Square Spindle Reducer 6mm to 4mm Polymer for Bathroom Lock Non-Metallic

Product Overview

Used in the hardware installation of interior doors, the 6/4 square spindle reducer enables the adaptation of bathroom lock mechanisms with a 6 mm hub to accept a 4 mm handle or WC thumbturn spindle. Frequently specified for residential and light commercial interiors, this polymer component allows consistent hardware fitment for specialized lock cases, especially in bathroom and WC doors.

A key differentiator of this item is its plastic (polymer) construction, which eliminates the risk of galvanic corrosion between metal components and ensures quiet, rattle-free operation. This benefit is relevant for residential project specifiers and maintenance providers who require durable, corrosion-resistant accessories during retrofits or routine hardware upgrades, particularly where non-metal interaction with handles or thumbturns is preferred.

Key Features

• Polymer construction ? non-metallic, resists corrosion, and prevents noise transfer between lock and spindle


• Size reduction ? adapts 6 mm lock hub for 4 mm spindle or thumbturn fitting


• Easy installation ? snaps into existing lock hub without the need for special tools


• Suitable for bathroom locks ? enables specialized hardware configurations for WC or restroom doors


• Lightweight design ? minimizes additional load on the lock mechanism


• Single piece unit ? convenient replacement or retrofit component

Technical Specifications

• Material: Polymer (plastic)


• Input Size: 6 mm (lock hub)


• Output Size: 4 mm (spindle/handle)


• Component Type: Square spindle reducer


• Use: Bathroom/WC locks

Applications

Commonly used in residential bathroom and WC doors to allow fitting of 4 mm spindles or thumbturns into locks with 6 mm hubs. Suitable for hardware retrofits, new installations in multi-unit housing, hotels, hostels, and other light commercial interior applications where non-metallic adapters are beneficial.

Packaging & Shipping

Standard export packaging. Unit includes single spindle reducer; bulk quantity available for project procurement or OEM supply.