Start with the thread and attachment style
The thread size and attachment method are the first compatibility checks for any backup pad. A 5" 8 hole backup pad with a 5/16-24 thread fits sanders that accept that arbor size. The PSA (pressure sensitive adhesive) style means you stick abrasive discs directly to the pad face, rather than using a hook and loop system.
If your sander uses a different thread, such as 5/16-18 or M8, this pad will not mount without an adapter. Always confirm your tool's arbor thread before ordering.
Product specifications at a glance
- 5" 8 HOLE, 5/16 - 24 THREAD BACK UP PAD (70595VH8) USA PSA: This Supergrit Abrasives back up pad is a 5 inch, 8 hole pad with a 5/16 - 24 thread. It is a USA PSA style back up pad, identified by the code 70595VH8. The 5/16-24 thread and 5" diameter are the key fit parameters. The 8 hole pattern matches many dust-extraction sanders, and the PSA surface lets you use adhesive-backed discs without a separate interface.
5" 8 HOLE, 5/16 - 24 THREAD BACK UP PAD (70595VH8) USA PSA - 5" 8 HOLE, 5/16 - 24 THREAD BACK UP PAD (70595VH8) USA PSA: Available as a Single or Pack of 2. If you only need one pad for a single sander, the single option saves money. The pack of 2 is useful if you keep a spare for quick changes or run multiple tools.
PSA vs. hook and loop: what this pad is designed for
This backup pad uses a PSA surface, not hook and loop. PSA discs have a peel-and-stick adhesive backing that bonds to the pad. They are generally thinner and can provide a flatter sanding surface than hook and loop discs, which have a cloth or foam backing.
If you prefer hook and loop discs for quick changes, this pad is not a direct match. You would need a hook and loop interface pad or a dedicated hook and loop backup pad. For users who already have PSA discs or prefer the lower cost per disc, this pad is a practical choice.
Dust extraction and hole pattern
The 8 hole configuration aligns with many dust-extraction sanders that use a 5" pad. The holes allow dust to pass through the pad and into the vacuum system, keeping the work area cleaner and extending disc life. Check that your sander's dust collection holes match the 8 hole pattern; some sanders use 6 or 12 holes.
Choosing between a single pad or a pack of 2
- Single pad: Best if you only own one compatible sander and do not need a backup. Lower upfront cost (USD 9.60).
- Pack of 2: Useful for keeping a spare on hand, equipping two tools, or having a fresh pad ready when the first wears out. Priced at USD 16.00 for the pair.
Practical limitations to consider
The supplied information confirms the thread size and pad diameter, but does not include operating speed ratings, maximum RPM, or material compatibility. Always verify that the pad is rated for your sander's speed before use. PSA adhesion can weaken with heat or heavy pressure, so avoid exceeding the recommended operating conditions for your specific abrasive discs.
