3M PSA Sanding Disc Brown 17in 120G PK12 89880553

What It Is

These 3M PSA sanding discs are non‑woven abrasive accessories for power and pneumatic sanders. Each 17‑inch disc uses a pressure‑sensitive adhesive backing for quick mounting on a compatible disc pad. The pack contains twelve discs graded at 120 grit with silicon carbide mineral. They suit professional finishers and DIY users working on paint, primer, gel coat, metal or wood surfaces.

Adhesive Mounting Limits

The PSA attachment relies on a clean, flat disc pad to hold securely during operation. Dust, residue or an uneven pad surface can reduce grip and cause the disc to shift or detach under load. The adhesive is designed for single‑use mounting; repositioning after initial contact will weaken the bond. Wet‑sanding lubricants must be compatible with the adhesive to avoid premature release.

Build And Daily Use

Silicon carbide abrasive on a non‑woven web gives consistent cut and a uniform scratch pattern across the 17‑inch face. The open mesh construction resists loading when sanding soft coatings or wet surfaces. Discs are flexible enough to follow contours yet stiff enough for flat panel work. Brown colour coding identifies the 120 grit grade at a glance in a busy workshop.