3M 7000000439 File Belt Sander Attachment Arm 28375

Product Description

The 3M 7000000439 is a file belt sander attachment arm, also identified as the Vessel 28375, designed to expand the capability of compatible file belt sanders for precision surface work. The arm features an oversized contact wheel geometry that allows technicians to blend and feather weld seams with consistent pressure and control. It accepts 1/4 inch or 1/2 inch wide by 24 inch long coated abrasive belts as well as Scotch-Brite belts, giving the operator flexibility to match abrasive type to the finish requirement. A tracking and control knob is included for belt alignment during operation. Weighing 0.68 pounds, the attachment is lightweight enough for extended handheld use in fabrication and metalworking environments.

This attachment arm is suited for metal fabrication shops, structural welding operations, and maintenance environments where weld seams require smoothing or blending prior to finishing or inspection. It is particularly useful on pipe, vessel, and structural steel surfaces where a flat platen cannot conform to the workpiece geometry. The contact wheel contact point allows the belt to follow curved and irregular surfaces. Fabricators, pipefitters, and maintenance welders working in industrial, commercial, and shipbuilding settings are the primary users of this accessory.

Key Features

• Large arm design optimized for blending and feathering weld seams on curved or irregular surfaces
• Compatible with 1/4 inch or 1/2 inch wide by 24 inch coated abrasive belts
• Also accepts Scotch-Brite belts for surface conditioning applications
• Includes a tracking and control knob for belt alignment and tension adjustment
• Lightweight at 0.68 pounds for reduced operator fatigue during extended use

Compatibility

Designed for use with compatible 3M file belt sanders that accept the Vessel 28375 arm attachment. Accepts 1/4 inch or 1/2 inch by 24 inch coated abrasive and Scotch-Brite belts.

Installation Notes

Installation and belt changes should be performed with the sander disconnected from the power source. Ensure belt tracking is verified with the control knob before resuming full-speed operation. Metal fabricators and maintenance technicians should follow applicable shop safety procedures and wear appropriate PPE, including eye protection and gloves, when operating abrasive equipment.

Technical Specifications

• Belt Width Compatibility: 1/4 inch or 1/2 inch
• Belt Length Compatibility: 24 inches
• Belt Type Compatibility: Coated Abrasive and Scotch-Brite
• Weight: 0.68 pounds
• Sold As: Each

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000000439