Description
This siastik 5 backup pad is a 1/2 in thick pressure sensitive adhesive backup pad built for random orbital sanders running a 5/16-24 threaded spindle. The medium edge profile leaves the rim of the pad slightly softer than the face, so the disc edge follows a curve or feature line instead of digging a hard ring into the panel.
Where This Siastik 5 Backup Pad Fits
Auto body and marine finishing shops mount this pad on their orbital sanders for feather edging, primer leveling, and clear coat sanding where a stiff, dead-flat pad would leave visible edge marks. The medium edge sits between a firm pad, which holds flat panels dead true, and a soft pad, which favors heavily contoured surfaces, making it the common choice for general body work that mixes both conditions in a single panel.
How This Siastik 5 Backup Pad Holds Up
The pad threads directly onto the sander spindle at 5/16-24 and accepts PSA (pressure sensitive adhesive) discs pressed straight onto its face, with no hook and loop needed. NH construction means it runs standard non-hole paper without wasted dust ports. Check the threaded insert periodically for wear, since a stripped thread is the most common failure point on a pad that otherwise holds its shape through repeated disc changes.
| Spec | Detail |
|---|---|
| Diameter | 5 in |
| Thickness | 1/2 in |
| Edge profile | Medium |
| Attachment | PSA (adhesive-back disc) |
| Arbor thread | 5/16-24 |
| Country of manufacture | Switzerland |
Order this pad to replace a worn backup pad on an existing sander, or step up to the 6 in version for wider coverage on larger panels. Browse Chemical Concepts abrasives and sanding accessories for matching PSA discs, or see the full sia Abrasives line at sia Abrasives.
Need Help?
Need help matching edge profile to your panel shape or sander thread? Call (800) 220-1966 or email [email protected].
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