Bosch X-LOCK 4-1/2″ 60 Grit Angled Flap Disc

The X-LOCK quick-change disc attachment system allows for tool-free, up to 5x faster changes — that’s the headline. For contractors grinding down welds all day or prepping metal surfaces, those saved minutes compound into real money. The 4.5 inch diameter, 60 grit aluminum oxide disc snaps on with an audible click, no wrench needed. Pull the release lever on the grinder to eject the disc without tools.

This Type 29 angled design targets metalworkers who need aggressive material removal. Type 29 (Angled) is preferred for heavier material removal on flat surfaces compared to the flatter Type 27 style. The conical shape puts more abrasive surface in contact with the workpiece, which matters when you’re blending thick welds or prepping structural steel.

Performance and Applications

Angled design (Type 29) provides better surface contact for aggressive grinding and weld blending. The 60 grit strikes the sweet spot for general metalwork — coarse enough to remove material efficiently, fine enough to leave a workable surface. Aluminum-oxide abrasive grain is suitable for general-purpose metalworking tasks.

Primary applications where this disc earns its keep:

• Surface preparation and weld blending for steel and stainless steel
• General-purpose grinding and finishing on metal surfaces
• Deburring and edge conditioning in metalworking workshops

The Type 29 angle excels at grinding flat surfaces where you need consistent, aggressive material removal. Think structural steel prep, heavy weld cleanup, or removing mill scale before painting.

Specifications and Compatibility

Specification	Value
Diameter	4.5 inches (115 mm)
Grit Rating	60 (Medium Grit)
Disc Type	Type 29 (Angled/Conical design for aggressive grinding)
Mounting System	X-LOCK (Quick-change, tool-free spindle mount)
Abrasive Material	Aluminum Oxide
Maximum RPM	13,300
Primary Model	FDX2945060 (Case of 10)

Here’s the catch: Strictly compatible with Bosch X-LOCK angle grinders. Not compatible with standard 5/8”-11 or 7/8” threaded/smooth arbors. You need a Bosch X-LOCK grinder to use these discs. No adapter exists to make them work with standard grinders.

Alternative model numbers for different needs:

• FDX2745060 (Type 27/Flat, 60 Grit) — flatter profile for lighter grinding
• FDX2945040 (Type 29, 40 Grit) — coarser for faster material removal
• FDX29450120 (Type 29, 120 Grit) — finer for finish work

The X-LOCK Advantage

X-LOCK discs eliminate the need for an arbor nut and wrench, providing significantly faster changeovers. Align the X-LOCK interface with the grinder spindle and ‘click’ into place. The system matters most when you’re switching between grit levels frequently — rough grinding to finish work on the same project.

For Montana contractors working in cold conditions, tool-free changes beat fumbling with wrenches when your hands are numb. Remote jobsites where losing small parts like arbor nuts creates real delays benefit from the snap-on system.

FDX2945060 is sold as a case of 10 individual discs. Individual discs are available through various retailers. Bulk packaging makes sense for shops burning through discs regularly.

The trade-off is system lock-in. Once you invest in X-LOCK grinders, you’re committed to buying X-LOCK accessories. Standard flap discs won’t fit. But for crews already running Bosch grinders, the time savings justify staying within the ecosystem. Professional contractors generally view the Bosch X-LOCK 4-1/2″ 80 Grit Angled Flap Disc positively, especially for its ease of use and suitability for metal work. The X-LOCK system is highlighted for its quick and secure attachment, which saves time during setup and changes. Its strengths include durability and effective material removal, making it a reliable choice for metal grinding and blending tasks.

Frequently Asked Questions

Q: Can I use Bosch X-LOCK flap discs on my standard angle grinder?

No, Bosch X-LOCK flap discs are strictly compatible with Bosch X-LOCK angle grinders. They’re not compatible with standard 5/8”-11 or 7/8” threaded/smooth arbors, and no adapter exists to make them work with regular grinders.

Q: What’s the difference between Type 27 and Type 29 flap discs?

Type 29 (angled/conical design) is preferred for heavier material removal on flat surfaces, while Type 27 has a flatter profile. The Bosch X-LOCK Type 29 angled design provides better surface contact for aggressive grinding and weld blending compared to flatter Type 27 discs.

Q: How fast can I spin the Bosch X-LOCK 4-1/2” 60 grit flap disc?

The Bosch X-LOCK 4-1/2” 60 grit flap disc operates at a maximum of 13,300 RPM. Always check that your grinder’s speed matches or stays below this rating for safe operation.

Q: What grit options are available for Bosch X-LOCK 4-1/2” Type 29 angled flap discs?

Bosch offers the X-LOCK 4-1/2” Type 29 angled flap discs in multiple grits: 40 grit (FDX2945040) for coarser, faster material removal, 60 grit (FDX2945060) for general metalwork, and 120 grit (FDX29450120) for finer finish work.

Q: How do I attach and remove X-LOCK discs?

To mount a Bosch X-LOCK disc, align the X-LOCK interface with the grinder spindle and it clicks into place — no tools needed. To remove, simply pull the release lever on the grinder to eject the disc, which makes disc changes up to 5x faster than traditional methods.

Q: Can I buy Bosch X-LOCK flap discs individually or only in bulk?

The FDX2945060 (60 grit Type 29) is sold as a case of 10 discs, but individual Bosch X-LOCK flap discs are available through various retailers. Bulk packaging in cases of 10 suits shops using multiple discs regularly.