Description
The Sia 1950 320 Grit Disc is a 6 inch, 17-hole hook-and-loop abrasive for sanding body filler, primer filler, lacquer, paint, and compatible composite surfaces. Its hole pattern supports dust extraction on matching backup pads, while the siafast attachment allows quick disc changes on compatible random-orbit sanders. This box-of-100 format is built for repeat finishing work where disc fit, grit, and scratch consistency matter.
Fitment and Surface Preparation
Confirm a 6 inch pad, 17-hole extraction pattern, and hook-and-loop face before ordering. This 320 grit version is suited to fine sanding primer filler, keying coatings, and preparing surfaces for blending or the next finish step. The 1950 siaspeed family uses paper backing through the P600 range with resin-over-resin bonding. Use the disc only on tools and pads rated for its diameter and intended sanding process.
How the Abrasive Performs
The manufacturer positions 1950 siaspeed as a versatile abrasive with a strong balance of removal rate, surface quality, and service life. The family uses aluminum oxide-based grain in this grit range and includes a stearate coating that helps manage loading. Coating structure varies across the family by grit. At 320 grit, the disc is intended to create a controlled scratch pattern for the stated preparation stage rather than replace every step in a multi-grit process. Follow the coating manufacturer’s recommended sequence when moving to primer, lacquer, paint, or polishing.
Product Details
| Property | Value |
|---|---|
| SKU | SIA1866.3684.0320 |
| Series | 1950 siaspeed |
| Disc diameter | 6 inches |
| Hole pattern | 17 holes |
| Attachment | Hook and loop |
| Grit | 320 |
| Backing | Paper |
| Bond | Resin over resin |
| Package | Box of 100 |
Match the grit to the existing scratch pattern and the next coating or finishing operation. Keep the extraction holes aligned, replace a loaded or damaged disc, and use suitable eye, respiratory, and dust-control equipment. Browse our abrasives for related discs, belts, pads, and surface-preparation supplies. Visit sia Abrasives for manufacturer information about the 1950 siaspeed family.
Need Help?
Need help matching a 17-hole disc to your pad or planning a grit sequence? Call (800) 220-1966 or email [email protected].
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