Technical Foundation
What Is a Mounted Point?
A mounted point is a small abrasive grinding wheel permanently bonded to a steel mandrel shank, designed to chuck into a die grinder or rotary tool for deburring, weld cleanup, and precision grinding in areas too small or contoured for a standard bench or angle grinder wheel. Points come in shapes — cylindrical, ball, cone, taper — matched to the geometry of the work: a ball point reaches into radiused corners and fillets that a cylindrical point can't access.
Abrasive type is chosen for the base material being ground: aluminum oxide suits steel and ferrous metals, while silicon carbide is preferred for non-ferrous metals, stone, and softer or more brittle materials where aluminum oxide's harder grain can cause excessive material removal or loading. Maximum safe operating speed (RPM) is stamped or printed on the shank and must not be exceeded — running a mounted point above its rated RPM risks the abrasive fracturing during use.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Point Shape | Cylindrical, ball, cone, taper, plug | Shape must match the work geometry — radiused areas need a ball or cone shape, flat bores need cylindrical |
| Abrasive Type | Aluminum oxide, silicon carbide | Aluminum oxide suits steel/ferrous metals; silicon carbide suits non-ferrous and softer materials |
| Grit Size | Coarse (24-36) for stock removal to fine (80-120) for finishing | Coarser grit removes material faster; finer grit leaves a smoother finish |
| Shank Diameter | 1/8in, 1/4in common | Must match the die grinder or rotary tool's collet size |
| Maximum RPM | Stamped on the shank per manufacturer rating | Exceeding rated RPM risks abrasive fracture and operator injury |
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Applications
Where Mounted Points Get Used
Mounted points are specified anywhere grinding or deburring needs to happen in a space too small or contoured for a standard bench or angle grinder wheel.
Weld Cleanup & Fabrication
Mounted points cleaning weld spatter, blending weld beads and dressing joints in tight or contoured areas.
Tool & Die Making
Precision internal grinding of dies, molds and fixtures where standard wheels can't access the geometry.
Foundry & Casting Finishing
Deburring and blending internal cavities and cored passages on castings.
Metal Fabrication & Machine Shops
General deburring of drilled holes, machined edges and internal bores on fabricated parts.
Maintenance & Repair
Field grinding and deburring in confined spaces using a die grinder rather than a bench grinder.
Brands
Mounted Points Brands in the Catalogue
Cross-reference freely between them — ask for an equivalent and ChatMRO shows what matches and what differs.
FAQ
Mounted Points Questions, Answered
How do I choose the right mounted point shape?
Match the shape to the work geometry — cylindrical points suit flat bores and straight internal surfaces, ball points reach into radiused fillets and corners, and cone or taper points work well for chamfering and angled transitions.
Aluminum oxide or silicon carbide — which do I need?
Aluminum oxide is the standard choice for steel and other ferrous metals. Silicon carbide is harder and sharper but more brittle, making it better suited to non-ferrous metals, stone, glass, and other softer or more brittle materials where aluminum oxide can load up or remove too much material.
What happens if I exceed the mounted point's rated RPM?
Running above the maximum RPM stamped on the shank significantly increases the risk of the abrasive fracturing during use, which can cause serious operator injury — always check the rated RPM against your die grinder's actual free-running speed before use.
What grit should I use for weld cleanup versus finishing?
Coarser grits (24-36) remove weld spatter and excess material fastest; finer grits (80-120) are used afterward for smoothing and finishing the surface once bulk material removal is done.
Do mounted points fit any die grinder?
Only if the shank diameter matches your die grinder or rotary tool's collet size — 1/8in and 1/4in shanks are the two most common sizes, and using an adapter or an incorrectly sized collet can cause runout or an unsafe mounting.
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