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Description
The 3M 7000028549 (also called 09450 / Pad Holder 917) is a 7-inch diameter hook & loop backup pad (disc pad holder) designed for abrasive disc attachment on right-angle grinders and random orbital sanders. With a 5/8-11 internal thread, a 3/8″ center hole, and a 5/16″ thickness, this pad holder provides a stable platform for sanding, blending, and finishing operations. It supports quick disc changes while maintaining a consistent backing surface and is engineered to meet industrial performance standards.
Product Features and Benefits
Threading & mounting
Internal thread: 5/8-11 (fits common arbor threads on angle grinders) and mounts securely to tool spindle; allows hook & loop disc attachment and removal.
Hook & Loop / abrasive interface
Designed to work with Scotch-Brite™ surface conditioning discs or other hook & loop abrasives and allows fast disc changes and reuse of discs.
Build & durability
Medium-density rubber/backing material (balanced firmness) and Suitable for industrial use, with durability under repeated disc changes and moderate vibration.
Efficient workflow
Quick disc changes reduce downtime in multi-step finishing or grinding tasks.
Compatibility & flexibility
Works with many hook & loop abrasive discs and fits commonly threaded tools (5/8-11).
Stable backing for uniform finish
The backing pad provides a flat, resilient support to help ensure consistent pressure and finish quality over the workpiece.
Extended abrasive life
Because you can peel off and reposition discs easily, you can maximize the usable surface of abrasives.
Product Specifications
| Manufacturer Part Number | 7000028549 |
| Legacy SKU | 61500292216 |
| Overall Diameter (Inch) | 7.0" |
| Overall Diameter (mm) | 177.8mm |
| Overall Length (Inch) | 9.19" |
| Overall Length (cm) | 23.34cm |
| Overall Thickness (Inch) | 0.31" |
| Overall Thickness (mm) | 7.87mm |
| Overall Width (Inch) | 9.19" |
| Overall Width (cm) | 23.34cm |
| Center Hole Diameter (Inch) | 0.375" |
| Center Hole Diameter (mm) | 9.525mm |
| Maximum Speed | 6000.0 mps |
| Abrasive Attachment Type | Hook & Loop |
| Application | Grinding |
| Color Family | White |
| Density Rating | Medium |
| Equipment - Machines | Right Angle Grinders, Disc Sanders |
| Form Type | Fabricated |
| Front Color | Black |
| Function/Attachment Style | Hook & Loop, Non-Woven Abrasives |
| Hook Type | 7 |
| Formula | White |
| Product Type | Back-up Pad |
| Thread Size | 5/8-11 |
| Type | Regular |
Frequently Asked Questions
What is the proper tool thread to mount this backup pad?
It uses an internal 5/8-11 thread, which matches many common angle grinder spindle or backing pad threads.
What is the center hole (bore) size?
The bore (center hole) is 0.375 inch (3/8″).
What kinds of discs can I mount?
Hook & loop (velcro style) abrasive discs (such as Scotch-Brite surface conditioning discs) designed for 7″ backing pads.
What is the recommended maximum speed?
Listings mention compatibility up to 6000 OPM (or equivalent angular speed) in some tool contexts.
Is this sold individually or by the case?
Typically sold 1 per case (one backing pad per package) in many industrial supply listings.
What is the “Pad Holder 917 / 09450 / 3M 9450” reference?
These are alternate/product family designations for the same backing pad style—3M uses “Pad Holder 917/9450/09450” to refer to this 7″ hook & loop disc pad holder.
Warning:
This product can expose you to materials and/or chemicals including arsenic, lead, and other materials and/or chemicals which are known to the state of California to cause cancer and/or reproductive harm.
For more information, visit www.P65Warnings.ca.gov
