4.5 Inch Grinding Disc (115mm): The Workshop Standard for Weld Grinding

Aug 10,2026

The 4.5 inch grinding disc (115 × 6.0 × 22.2 mm) pairs with the world's most common angle grinder to handle the bulk of daily grinding work: weld removal and dressing, deburring, rust and scale cleaning on steel structures and pipes. If a workshop stocks only one grinding disc, it is this one.

Daily Applications

Weld seam removal and blending on structural fabrications
Deburring flame-cut, plasma-cut and sheared edges
Surface preparation before welding, painting and galvanizing
Repair work: removing cracked welds and fatigued metal

Specifications

Size	Bore	Max RPM	Working angle	Reinforcement
115 × 6.0 mm	22.2 mm (7/8")	13,300	15–25°	Double fiberglass mesh

Advantages of the 4.5 Inch Size

Universal: fits every 4-1/2" grinder; discs are stocked everywhere at the lowest price per piece.
Fast removal: 6 mm of coarse abrasive grinds welds aggressively at 80 m/s.
Long life: a 4.5" grinding disc typically outlasts 10–20 thin cutting discs on surface work.
Balanced: enough contact area for flat work, small enough for edges and corners.

Grinding Technique

Hold 15–25° working angle; use the disc face, never the edge.
Use the weight of the tool — excess pressure overheats disc and workpiece.
Follow heavy grinding with a flap disc (80–120 grit) for a finished surface.

FAQ

How many welds can a 4.5 inch grinding disc handle?

Roughly 10–30 m of weld bead per disc depending on bead size and steel hardness. When the face glazes, a dressing pass on scrap steel restores the cut.

Can I grind stainless with a standard 4.5 inch grinding disc?

Only with an INOX-rated version — standard discs contaminate stainless and cause later rust staining.

When should I step up to a 7 inch grinding disc?

When you're grinding large flat areas or heavy welds all day — the bigger disc covers 2.5× the area per pass and runs on more powerful grinders.

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