3M™ Hookit™ Blue Abrasive Disc 321U, 36289, 3 in, Grade 320, No Hole, 50 Discs/Carton, 4 Cartons/Case

The 3M™ Hookit™ Blue Abrasive Disc 321U delivers best-in-class performance at every stage of paint prep and coatings removal. Premium aluminum oxide mineral abrasive is blended with ceramic grain for a full range of sanding applications. The multi-hole discs feature a specially-designed pattern that reduces loading, extends disc life and aligns with most backup pads. Hookit™ attachment makes disc changes easy.
Special Price $35.49 Regular Price $41.75
UPC 00051131362895
3M ID 7100230015
Packaging Carton
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Best-in-Class Performance in Every Grade

Part of a full line of 3M™ Blue Abrasives, the 3M™ Hookit™ Blue Abrasive Disc is engineered for best-in-class cut, life and efficiency across your entire shop. The disc features a tough ceramic blended with premium aluminum oxide mineral for just the right balance. 3M™ Blue Abrasives deliver consistently excellent results in a minimum amount of time, on jobs ranging from aggressive paint removal and fresh filler sanding to blend preparation and sanding primer. Discs are available in a wide range of sizes and grades.

Dust Extraction Features Enhance Performance and Disc Life

The multi-hole pattern on this disc is specially designed to capture dust and keep it away from the abrasive surface. This specially-designed hole pattern reduces loading and extracts dust more efficiently compared to standard 6- or 7-hole disc configurations. It includes alignment guides across the disc, making it fast and easy to align with nearly any backup pad. The mineral blend on the 3M™ Hookit™ Blue Abrasive Disc is bonded using upgraded resins for enhanced durability. An anti-loading coating helps keep dust from gathering between the abrasive grains for a faster cut and for consistent performance throughout the life of the disc.

The Hookit™ Attachment System

The Hookit™ attachment system has a hook-and-loop feature which makes disc attachment, removal, and re-attachment clean and easy. It also facilitates use and re-use of the disc for maximum product life. Hookit™ discs have a brushed nylon loop backing of the type most commonly used in everyday hook-and-loop applications. 3M™ Hookit™ disc pads (sold separately) feature hooks which grip the brushed nylon loop backing. it's simple: just attach the disc and start sanding. The disc removes just as cleanly and easily. The Hookit™ system is designed for work spaces and applications where adhesive backed discs may become contaminated by dust, dirt, or debris.

Better Science for Better Sanding from 3M

3M™ Blue Abrasives family is designed as a cost-effective, high-performance upgrade for any sanding application in body repair and paint preparation. From its balanced, engineered mineral blend to its multi-hole pattern for dust extraction, the 3M™ Hookit™ Blue Abrasive Disc is another way that 3M applies science to deliver best-in-class performance for professionals in paint preparation and auto repair.


  • A best-in-class abrasive for a variety of applications
  • Engineered ceramic mineral blend is balanced for maximum abrasive performance in its class
  • Discs available in mutli-hole pattern for excellent dust extraction or in no-hole format
  • Anti-loading coating prevents dust and debris from clogging the cutting surface
  • Upgraded resins improve durability and finish
More Information
3M ID 7100230015
Part number 36289
Keywords 36289
Global Product Hierarchy Abrasives > Abrasive Discs > Paper Discs
Abrasive Material Ceramic Aluminum Oxide
Application Clear Coat
Backing Material Paper
Backing Weight C Weight
Bond Type Resin
Color Family Blue
Grit 320
Product Color Blue
Product Number 321U
Product Type simple
Quantity 0
Trademark 1 3M™
Trademark 2 Hookit™
Country of Origin Cameroon
SAP Shelf Life In Days 1825
Base - Billing Unit EA
Base - Metric Gross Weight 2.0 G
Base - Metric Width Dimension 0.076 M
Base - Item Quantity 1
Base - Unit EA
Unit of Use - Billing Unit EA
Unit of Use - Customary Cubic Dimension 0.8271768512040961 ci
Unit of Use - Customary Gross Weight 0.004409245243697552 lbs
Unit of Use - Customary Net Weight 0.002998286765714335 lbs
Unit of Use - Metric Cubic Dimension 13.555 CCM
Unit of Use - Metric Net Weight 1.36 G
Unit of Use - Item Quantity 1
Unit of Use - Total Unit Quantity 1
Unit of Use - Previous Packaging Level Quantity 1
Unit of Use - Item Unit EACH
Unit of Use - Unit EA
Consumer - Billing Unit EA
Consumer - Customary Cubic Dimension 19.52875756145213 ci
Consumer - Customary Gross Weight 0.18899788812585186 lbs
Consumer - Customary Net Weight 0.14991433828571676 lbs
Consumer - Customary Height Dimension 2.0 in
Consumer - Customary Length Dimension 3.1248031496062993 in
Consumer - Customary Width Dimension 3.1248031496062993 in
Consumer - Metric Cubic Dimension 320.019 CCM
Consumer - Metric Net Weight 68.0 G
Consumer - Metric Height Dimension 5.08 CM
Consumer - Metric Length Dimension 7.937 CM
Consumer - Metric Width Dimension 7.937 CM
Consumer - Item Quantity 50
Consumer - Total Unit Quantity 50
Consumer - Previous Packaging Level Quantity 50
Consumer - Previous Packaging Level Unit EACH
Consumer - Item Unit EACH
Consumer - Unit KAR
Shipper - Billing Unit EA
Shipper - Customary Cubic Dimension 165.43994702162632 ci
Shipper - Customary Gross Weight 0.881998963077796 lbs
Shipper - Customary Net Weight 0.5996573531428671 lbs
Shipper - Customary Height Dimension 4.0 in
Shipper - Customary Length Dimension 8.8 in
Shipper - Customary Width Dimension 4.7 in
Shipper - Metric Cubic Dimension 2711.075 CCM
Shipper - Metric Weight 400.068 G
Shipper - Metric Net Weight 272.0 G
Shipper - Metric Height Dimension 10.16 CM
Shipper - Metric Length Dimension 22.352 CM
Shipper - Metric Width Dimension 11.938 CM
Shipper - Item Quantity 200
Shipper - Total Unit Quantity 200
Shipper - Previous Packaging Level Quantity 4
Shipper - Previous Packaging Level Unit CTNS
Shipper - Item Unit EACH
Shipper - Unit CS
Pallet - Billing Unit EA
Pallet - Customary Cubic Dimension 98736.41794527683 ci
Pallet - Customary Gross Weight 476.9987643310667 lbs
Pallet - Customary Net Weight 296.83038980571916 lbs
Pallet - Customary Height Dimension 49.0 in
Pallet - Customary Length Dimension 48.0 in
Pallet - Customary Width Dimension 42.0 in
Pallet - Metric Cubic Dimension 1.618 M3
Pallet - Metric Net Weight 134.64 KG
Pallet - Metric Height Dimension 124.46 CM
Pallet - Metric Length Dimension 121.92 CM
Pallet - Metric Width Dimension 106.68 CM
Pallet - Item Quantity 99000
Pallet - Total Unit Quantity 99000
Pallet - Previous Packaging Level Quantity 495
Pallet - Previous Packaging Level Unit BOX
Pallet - Item Unit EACH
Pallet - Unit PAL
Pallet - Pallet Layer Quantity 11
Pallet - Shipping Container Per Layer Quantity 45
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