3M 7100077051 Spindle 5/16-24 Random Orbital Sander

Product Description

The 3M 7100077051 is a steel spindle designed to accept a backup pad on random orbital sanders. The spindle features a 5/16-24 internal thread, which is the interface point between the sander's drive mechanism and the backup pad. It serves as a critical mechanical connection that transfers rotational motion to the pad during sanding operations. This part is typically replaced when threads are worn, stripped, or damaged. Installation is performed by sanding equipment technicians or experienced tradespeople maintaining abrasive tool assemblies.

This spindle is used on 5 inch and 6 inch random orbital sanders where the backup pad must be securely threaded onto the drive. It suits applications in bodywork, surface preparation, finishing, and material removal where a properly seated backup pad is essential for consistent abrasive contact. The 5/16-24 thread specification is a standard size found across several random orbital sander platforms.

Key Features

• Steel construction for durability under rotational load
• 5/16-24 internal thread matches standard backup pad fasteners
• Compatible with 5 inch and 6 inch random orbital sander configurations
• Direct OEM-style replacement for worn or damaged spindles

Compatibility

Designed for use on 5 inch and 6 inch random orbital sanders requiring a 5/16-24 internal thread spindle for backup pad attachment.

Installation Notes

Disconnect and power down the sander completely before servicing the spindle. Use the appropriate wrench or spindle-locking tool to remove the old spindle and install the replacement without cross-threading. Ensure the backup pad is fully seated and threads are engaged before resuming operation. If the unit is pneumatic, disconnect the air supply before beginning disassembly.

Technical Specifications

• Material: Steel
• Thread Size: 5/16-24 Internal Thread
• Compatible Sander Size: 5 inches and 6 inches
• Unit of Measure: Each
• UPC: 00051115281747

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100077051