Bosch FDX2945040-10 4-1/2-Inch Type 29 40-Grit X-LOCK Flap Disc

Bosch FDX2945040-10 is a 4-1/2-inch Type 29 flap disc with 40-grit zirconia abrasive and an X-LOCK mounting design. Its coarse grit is aimed at metal stock removal, while the quick-change interface is useful for compatible grinders. The listing says it also works with standard 7/8-inch arbor mounts, so confirm the fit for your tool before buying.

At a glance

X-LOCK mounting is described as a snap-on fit with release by a lever, without a spanner wrench or flange nuts.
40-grit zirconia abrasive is specified for coarse metal grinding and fast stock removal.
The listing claims backward compatibility with standard 7/8-inch arbor mounts.
A plastic backing is described as helping reduce the risk of material gouging.

Price

$48.65Save 15%

Reference price: ~~$57.23~~

Price checked: Nov 14, 2026

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Often bought together

Bosch TCWX1S450P10 4-1/2 in. X-Lock® Metal/Stainless Steel Cutting Wheels - 10 Pack, 60 Grit, Type 1/41

$12.16

Swozzto XLOCK to 5/8"-11 Thread Adapter Kit with Quick Change Nut | Suitable for XLOCK Angle Grinders, Convert and Install Saw Blades, Polish Discs

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Pros and cons

Pros

X-LOCK mounting enables tool-free wheel changes on compatible grinders, according to the listing.
Coarse 40-grit zirconia is suited to removal-focused metal grinding rather than fine finishing.
The claimed 7/8-inch arbor compatibility may broaden use beyond X-LOCK grinders.

Technical specifications

12 specifications

Identity and abrasive
Brand	Bosch
Model	FDX2945040-10
Disc type	Type 29
Grit number	40
Grit grade	Coarse
Abrasive material	Zirconia
Compatible material	Metal
Maximum rotational speed	13300 rpm

Dimensions and installation
Dimensions listed	4.5 x 4.5 x 0.1 inches
Weight listed	3.52 ounces
Mounting	X-LOCK
Compatibility listed	Angle Grinder, Bench Grinder, Die Grinder

What to know before buying

The listing describes faster changes and less vibration as design benefits, but does not provide independent performance measurements.
The listing claims backward compatibility with standard 7/8-inch arbor mounts. Confirm the disc and grinder fit before use.

What’s in the box

Included

4-1/2-inch X-LOCK Arbor Type 29 40-Grit Flap Disc

Who is it for?

A good fit for

Metal grinding or blending where coarse stock removal is the priority.
Users with an X-LOCK grinder seeking a tool-free disc swap.
Buyers who want a Type 29 disc and have verified compatibility with their grinder.

Less suited to

Fine finishing that calls for a finer grit.
Buyers who need confirmed fitment for a specific grinder without checking its mount.

Bosch FDX2945040-10 4-1/2-Inch Type 29 40-Grit X-LOCK Flap Disc · photo 2 — Additional product photo 2

Customer reviews on Amazon

1 / 5 · 3 ratings

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The supplied rating evidence is entirely one-star, but comes from only three ratings and includes no written review summary. This is a strongly negative but very small and unexplained signal, so it does not identify a specific problem or establish why customers rated the disc poorly. Consider it alongside the listed 40-grit metal-grinding purpose and verify fitment before choosing it.

Frequently asked questions

What abrasive and grit does this disc use?

The listing specifies zirconia abrasive and coarse 40 grit.

What mounting options are claimed?

It has an X-LOCK mount. The listing also claims backward compatibility with standard 7/8-inch arbor mounts, but check compatibility with your grinder.

What work is it intended for?

The listing describes it for fast material removal and metal grinding or blending. Its coarse grit is not positioned as a fine-finishing grade.

What dimensions and weight are listed?

The listing gives dimensions of 4.5 x 4.5 x 0.1 inches and a weight of 3.52 ounces.