Abrasive Products Guide
High-Performance Abrasive Flap Discs — Complete Buyer's Guide & Specs
Abrasive flap discs are the go-to tool for grinding, deburring, weld blending, and surface finishing. This guide covers everything you need to choose the right disc — grit, size, backing type, and recommended use case.
Max speed: 72 m/s Grits: 40# – 120# Sizes: 100 – 180 mm OEM orders accepted
What are abrasive flap discs?
A flap disc is an abrasive tool made of overlapping (flap-style) coated abrasive sheets mounted on a fiberglass or plastic backing plate. Compared to conventional grinding wheels, they remove material and finish in a single pass — reducing tool changes and operator fatigue.
They are used on angle grinders and are available in Type 27 (flat) and Type 29 (conical) profiles to suit flat surfaces and edge work respectively.
Key features & benefits
Premium materials
Fiberglass or plastic backing for maximum durability under continuous load.
72 m/s working speed
High-speed rated for fast, efficient, consistent stock removal and finishing.
Cool grinding action
Reduced heat build-up protects workpiece integrity and extends disc life.
Low vibration & noise
Engineered flap overlap minimises operator fatigue on long finishing runs.
Quick installation
Standard 16 mm and 22 mm arbour holes fit common angle grinder spindles.
OEM customisation
Custom grit, label, and pack size available for trade buyers and distributors.
Performance at a glance
Working speed vs typical benchmark (80 m/s max) 72 m/s
Grit range coverage (40# coarse → 120# fine) Full range
Size range coverage (100 mm → 180 mm) 5 sizes
Full product specifications
Five standard disc sizes, each available in four grits and shipped in bulk packaging. Choose based on your angle grinder size and arbour bore.
| Diameter × Bore | Available grits | Qty / box | Box dimensions (cm) |
| 100 × 16 mm | 40#60#80#120# | 300 pcs | 41 × 31 × 23 |
| 115 × 22 mm | 40#60#80#120# | 300 pcs | 59 × 24 × 23 |
| 125 × 22 mm | 40#60#80#120# | 300 pcs | 64 × 28 × 26 |
| 150 × 22 mm | 40#60#80#120# | 150 pcs | 31 × 31 × 27 |
| 180 × 22 mm | 40#60#80#120# | 150 pcs | 37 × 37 × 29 |
Recommended applications
Grinding to bare metal
Strip surfaces quickly before priming or coating. Use 40#–60# for fast removal.
Deburring
Smooth sharp edges and burrs after cutting or welding. 60#–80# gives control.
Weld grinding & seam blending
Blend welds flush for a clean finish. 80# removes weld bead; 120# refines the surface.
Edge grinding
Shape and smooth metal or wood edges. Type 29 conical profile excels here.
Rust & paint removal
Efficiently strip corrosion and old coatings. 40#–60# cuts through heavy build-up fast.
Woodworking
Shape, contour, and sand wood. 80#–120# delivers a smooth, splinter-free finish.
Frequently asked questions
What grit flap disc should I use for grinding stainless steel?
For stainless steel, start with 40# or 60# to remove heavy stock or weld spatter, then step up to 80# or 120# for blending and finishing. Aluminium oxide and zirconia alumina abrasives are most common for stainless.
What is the maximum operating speed for these flap discs?
The maximum working speed is 72 m/s (metres per second). Always verify that your angle grinder's rated RPM does not exceed the disc's maximum surface speed at the diameter you are using.
What is the difference between fiberglass and plastic backing?
Fiberglass backing offers higher rigidity and is preferred for heavy grinding and high-pressure applications. Plastic backing provides more flexibility, making it suitable for finishing and contouring irregular surfaces.
Are OEM and custom orders available?
Yes. OEM services are available, including custom grit selection, disc dimensions, label design, and packaging quantities. Contact the supplier directly to discuss minimum order quantities and lead times.
Can these discs be used on wood as well as metal?
Yes. These flap discs are suitable for both metal and wood. For wood shaping and rough removal use 40#–60#; for sanding and finishing use 80#–120#. Use at a lower angle on wood to avoid gouging.
Selecting the right grit — quick reference
Grit number directly controls how aggressively a disc cuts and how smooth the resulting surface is. Use this as a starting point, then adjust based on material hardness and the finish required.
40# — coarse / aggressive removal
Best for stripping paint, rust, and heavy scale; fast weld removal; rough shaping. Leaves visible scratch marks that need further finishing.
60# — medium / stock removal
A versatile all-rounder for deburring, moderate weld grinding, and surface preparation before priming. Balances speed with surface quality.
80# — medium-fine / blending
Ideal for weld seam blending, light deburring, and pre-finishing. Leaves a smoother surface than 60# and reduces subsequent sanding time.
120# — fine / finishing
Used for final surface preparation, light polishing, and removing scratches left by coarser grits. Produces a near-finished surface ready for coating or painting.
Ready to order or need a custom spec?
OEM services available — discuss grit, size, labelling, and pack quantity.
