3M 01603 316U Series Abrasive Disc, 5 in Dia, P320 Grit, PSA, Red

Our 3M™ Stikit™ red abrasive disc 316U is an economical disc that delivers reliable performance. It features aluminum oxide mineral abrasive on A weight or durable D weight paper backing depending on grade. These discs are ideal for standard jobs such as filler shaping, featheredging, paint prep and finish. Our 3M™ Stikit™ attachment makes disc change outs fast and easy. The 3M™ Stikit™ red abrasive disc 316U delivers reliable performance on collision repair substrates, yet remains an economical choice for collision repair operations. Choose aluminum oxide mineral abrasive in grades up to P800 for most body and paint sanding applications. Red Abrasive Discs are available with D weight paper backing in 40 to P80 grade abrasives for aggressive shaping of plastic filler or paint removal around damaged areas.
3M 316U PSA roll uses aluminum oxide as the abrasive material and has a diameter of 5 in. 3M incorporates this aluminum oxide material into the PSA roll forming a grit of 320. This abrasive is on a paper backing, A weight.
Specification parameters description:
Backing Weight:
Paper and cloth have a lettering scale for backing weight that measures strength of the material onto which the abrasive is mounted. Paper uses the letters A-F, where A is a lighter weight and most flexible and F represents a rigid, heavier backing. Lighter backings are typically paired with finer abrasive grits, suitable for blending and finishing. Coarser grits used for deburring and stock removal rely on a heavier backing. Cloth uses a lettering system of J, X, and Y for backing weight. J weight (jeans) is the lightest and most flexible, X weight (drills) is more durable and recommended for medium duty work, and Y weight is the toughest and least flexible. Fiber backings are made from chemically-impregnated paper to form a very hard, strong backing material. Fiber is used primarily for sanding discs. Polyester film backing provides high strength with a very thin backing and is used for very fine grits. It is more tear resistant than paper backing and is also waterproof.
Grit:
Grit is a measurement of the size of abrasive particles embedded in coated abrasives. The most common standards for grit size are the United States CAMI (Coated Abrasive Manufacturers Institute) and the European FEPA (Federation of European Producers of Abrasives). A smaller grit number means larger particles and a coarser grade, while high number grits are used for finer work. Grit is generally a unitless measure but is sometimes measured in microns.
Abrasive Material:
Values: A/O Aluminum Oxide AO A/Z Alumina Zirconia AZ S/C Silicon Carbide SC Alumina Zirconia Alumina zirconia is very dense and can be used under high temperatures for heavy-duty stock removal, wood planing, and grinding of fiberglass and plastics. The abrasive grain is designed to fracture during use so that it maintains sharpness. Aluminum Oxide Aluminum oxide is an artificial abrasive suited for general purpose stock removal and finishing. It is the mostly commonly used abrasive and can be used for most steels and ferrous alloys. Aluminum oxide is slightly softer but tougher than silicon carbide. Ceramic Ceramic is used for aggressive cutting and grinding of stainless steel, titanium, and metal alloys. The abrasive grain is designed to fracture during use so that it maintains sharpness. Ceramic Aluminum Oxide Cerium Oxide Diamond Diamond can be either natural or manufactured and is one of the hardest abrasive materials. It is commonly used for grinding and polishing stone and very hard steels, and for sharpening other cutting tools. Mesh Silicon Carbide Silicon carbide is a manufactured material that is extremely hard but brittle. It is commonly used for fast cutting under light pressure, particularly on cast iron, nonferrous metals, and materials such as glass and plastic. Precision Shaped Ceramic Grain Zirconia