What is the thickness of these discs?

The thickness of the abrasive area depends on the grit: - The 80 grit is .497" (12.6mm) thick in the area where the abrasive flaps are and that includes the black mounting wheel/disc - The 120 grit is .315" (8.1mm) thick in the area where the abrasive flaps are and that includes the black mounting wheel/disc The thickness of the black mounting wheel/disc is standard at a little less than 1/8"

which ones do you use for sharpening lawn mower blades?

Type 27 is flat. Type 29 is bevelled. Either could be used to sharpen blades, depending on personal preference.36 or 40 grit is very aggressive for fast stock removal. No need to go any finer than that for mower blades.

Does this have the quick change nut on it?

These fit any 4.5" angle grinders with the standard lock nut, but they DON NOT have the X-Lock type "teeth" to interface with an X-Lock/Quick Change type angle grinder

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🔧 Grind smarter, not harder — the pro’s choice for flawless finishes!

BUILT TO OUTPERFORM - Outlasts resin fiber and aluminum oxide discs, delivering longer life and consistent performance.
MAXIMIZED SURFACE AREA - High-density jumbo design offers 30-60% more grinding surface for faster stock removal.
VERSATILE METAL MASTERY - Perfect for weld blending, deburring, edge chamfering, and finishing across multiple industries.
INDUSTRIAL GRADE PRECISION - Engineered with premium European zirconia cloth for uniform grit and superior durability.
ANSI EU CERTIFIED QUALITY - Meets and exceeds industrial standards ensuring reliability and professional-grade results.

Benchmark Abrasives 4.5" x 7/8" Type 27 flap discs feature high-density zirconia alumina for aggressive stock removal and finishing. Designed for 4.5" angle grinders, these 40 grit discs deliver superior durability, lasting twice as long as aluminum oxide alternatives. Ideal for weld blending, deburring, and metal fabrication, they meet ANSI and EU standards, making them a trusted tool for professionals across automotive, construction, and fabrication industries.

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Manufacturer	Benchmark Abrasives
Part number	BM-F4.5SZ40T27HD
Item Weight	1.05 kg
Item model number	BM-F4.5SZ40T27HD
Colour	Blue
Style	40 Grit \| 10 Count
Material	Zirconia Alumina
Pattern	40 Grit
Item thickness	0.88 Inches
Item Package Quantity	10
Cutting Diameter	4.5 Inches
Grit Number	40
Grit Description	40 Grit
Batteries included?	No
Batteries Required?	No
Item diameter	4.5 Inches

Benchmark Abrasives 4.5" x 7/8" Premium High-Density Jumbo Zirconia Type 27 Flap Discs for Sanding, Stock and Rust Removal, Finishing, Grinding, Deburring (10 Pack) - 40 Grit

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