Internal precision deburring and heavy stock removal in confined cast or forged steel bores frequently cause rapid abrasive loading and premature spindle flex. The Norton Abrasive Mounted Point A1 (66253054961) delivers rigid, targeted metal removal in tough alloy steels without chatter or heat-induced workpiece distortion.

What’s In the Box

  • 10 x Norton A1 Mounted Points 
Benefit-Driven Technicals

  • Pink Aluminium Oxide (86A) Grain Structure: Delivers self-sharpening breakdown for sustained cut rates across hard alloy steel fabrications.
  • Vitrified Bond System (PVS): Ensures high edge retention and minimal point breakdown under heavy radial side-loads.
  • 6 mm Precision Steel Shank: Resists bending during high-RPM internal porting, maintaining concentric running and operator safety.
  • Medium 60 Grit Specification: Balances high material removal rates with a predictable, uniform surface finish prior to final polishing.
Features

  • Precision-shaped A1 profile engineered for deep-cavity profile grinding and edge dressing.
  • Balanced vitrified construction for consistent wear patterns across the entire abrasive matrix.
  • Corrosion-resistant nickel-plated shank for extended collet life and precise concentricity.
  • Packaged in a protective 10-piece industrial box to prevent transit damage and cross-contamination.
Applications

  • Internal weld dressing and radiusing in heavy structural pipework and valve bodies.
  • Deburring machined cast iron casings, die modules, and forged steel components.
  • Cleaning internal thread roots, keyways, and awkward internal radii on die-grinder setups.
EWS Expert Note
To avoid dangerous shank bending and ensure maximum abrasive life, never exceed the maximum operating speed calculated for the overhang distance of your collet setup. For an overhang of 12 mm or less on this 30 mm head, run your die grinder between 15,000 RPM and 19,000 RPM while maintaining constant, light feed pressure.

Pros & Cons

Pros

  • Superior form retention during sustained internal grinding on hard tool steels.
  • Reduced thermal output prevents work-hardening of sensitive heat-treated alloys.
  • High concentricity minimises vibration, reducing operator hand-arm fatigue over extended shifts.
Cons

  • Not suitable for non-ferrous metals like aluminium due to rapid loading of the vitrified structure.
  • Requires a rigid pneumatic or electric straight die grinder capable of maintaining stable RPM under load.
Technical FAQs

Q1: Is this mounted point compatible with standard 1/4-inch die grinder collets?

A1: No, this unit features a metric 6 mm precision shank. While a 6 mm shank may fit inside a 6.35 mm (1/4-inch) collet, using non-matching sizes causes severe runout, slippage, and potential shank shearing. Always secure this mounted point into a dedicated 6 mm collet chuck.

Q2: What are the primary performance limits when dressing stainless steel welds?

A2: While the 86A pink aluminium oxide grain cuts stainless steel effectively, sustained heavy grinding on austenitic grades can generate excess heat. To prevent localised heat tinting or glaze build-up, apply light, intermittent pressure and keep the point moving continually across the workpiece surface.

Q3: How should these mounted points be stored and inspected to remain compliant?

A3: Store these mounted points in their original packaging in a dry, temperature-controlled environment to prevent moisture absorption in the vitrified bond. Inspect each point visually for cracks, chips, or loose shanks before mounting, in full compliance with UK Health and Safety Executive (HSE) abrasive wheel regulations.

As an Official UK Stockist, Express Weldcare provides genuine Norton equipment with expert technical backup and fast despatch.