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

The Bosch X-LOCK 60 grit angled flap disc delivers tool-free disc changes up to 5x faster than conventional mounting systems. The Type 29 angled design provides better surface contact for aggressive grinding tasks — exactly what metal fabricators need when prepping structural steel in Montana’s agricultural buildings and industrial facilities.

This isn’t just another flap disc with a fancy mounting system. The X-LOCK interface only works with Bosch X-LOCK angle grinders, which means committing to their ecosystem. The payoff? Click the disc into place and hear the confirmation. Pull the release lever to eject — no wrenches, no stuck arbor nuts. For contractors bouncing between remote jobsites where every minute counts, that efficiency adds up.

Technical Specifications and Performance

The disc spins at a maximum 13,300 RPM on 4.5-inch (115mm) angle grinders. The tough zirconia alumina grit handles wear resistance on stainless steel, ferrous metals, and sheet metals — materials that show up daily in Montana metalwork.

Specification	Value	Source
Diameter	4.5 inches (115 mm)	Manufacturer
Grit Rating	60 (Medium Grit)	Manufacturer
Disc Type	Type 29 (Angled/Conical)	Manufacturer
Maximum RPM	13,300	Manufacturer
Abrasive Material	Aluminum Oxide / Zirconia Alumina	Manufacturer
Mounting System	X-LOCK (Quick-change)	Manufacturer

Type 29’s angled design beats Type 27 flat discs for heavier material removal on flat surfaces. The conical shape lets you grind at a lower angle without digging the edge in — critical when blending welds on expensive stainless or cleaning up torch cuts on structural steel.

Real-World Applications and Trade Feedback

These discs handle general-purpose grinding on metal surfaces, surface preparation and weld blending for steel and stainless steel, plus deburring and edge conditioning in metalworking shops.

Professional contractors appreciate the durability and effective material removal. The downside: like most flap discs, they generate significant heat and dust, requiring proper PPE and ventilation. Primary uses include metal fabrication, maintenance, and welding prep.

The optimized flap design reduces vibration and improves grinding speed. The X-LOCK mounting allows tool-free, snap-on wheel changes that are up to five times faster than traditional methods — not marketing fluff when you’re changing discs multiple times per shift.

Bottom Line

Worth it for shops already invested in Bosch’s X-LOCK platform. The X-LOCK system eliminates the need for an arbor nut and wrench, solving the stuck-nut problem that wastes time on every jobsite. The fibreglass carrier plate comes in angled and straight versions, giving options for different grinding angles.

The catch? Strictly compatible with Bosch X-LOCK angle grinders — not compatible with standard 5/8”-11 or 7/8” threaded arbors. You can’t slap these on your existing DeWalt or Milwaukee grinders. For contractors running mixed tool fleets, that’s a dealbreaker.

The FDX2945060 model comes as a case of 10 discs, with individual discs available through various retailers. For metal fabricators who’ve already bought into X-LOCK, these discs deliver the speed advantage Bosch promises. Everyone else needs to weigh whether switching platforms makes sense for their operation.

Frequently Asked Questions

Can I use X-LOCK discs on my standard angle grinder? No. These discs work strictly with Bosch X-LOCK angle grinders and won’t fit standard 5/8”-11 or 7/8” threaded arbors. You need the matching X-LOCK grinder to use these discs.

What’s the difference between Type 27 and Type 29 flap discs? Type 29 has an angled/conical design that provides better surface contact for aggressive grinding. Type 29 is preferred for heavier material removal on flat surfaces compared to Type 27’s flat profile.

How fast is the X-LOCK system compared to standard mounting? The X-LOCK quick-change system allows disc changes up to 5x faster than conventional mounting methods. No wrench needed — just click in and pull the lever to release.

What materials can this disc handle? The zirconia alumina grit works on stainless steel, ferrous metals, and sheet metals. It’s suitable for general-purpose grinding and finishing on metal surfaces, particularly weld blending and surface preparation.