Norton - Bluefire 4 1/2", Type 1, Cut-Off Wheel, 7/8" Arbor Hole Size

The Norton BlueFire Type 1 cut-off wheel is built for aggressive material removal, using a blend of zirconia alumina and aluminum oxide abrasives. This 4-1/2" wheel is reinforced to provide safety, strength, and straight cuts. It’s designed to work on ferrous metals, stainless steel, aluminum, and gray iron.

Key features:

• Zirconia alumina and aluminum oxide abrasive blend
• Reinforced design for strength and safety
• Type 1 (straight/flat) style for peripheral cutting
• Resin bond that releases dull grains under heat
• Suitable for ferrous metals, stainless, aluminum, and gray iron

• Diameter: 4-1/2 in
• Thickness: 0.0625 in (1/16 in)
• Arbor hole size: 7/8 in
• Abrasive material: Zirconia alumina / aluminum oxide
• Max RPM: 13,580

• Check the grinder: ensure you are using a right-angle grinder that accepts a 7/8″ arbor, confirm the wheel’s maximum RPM rating is at or above the grinder’s free speed (typically 13,580 RPM for this wheel). 
• Inspect the wheel before mounting: verify the cut-off wheel is free of cracks or damage, the arbor hole fits snugly on the spindle, and you are matching the correct wheel type for your cut (Type 1 straight cutting). 
• Mount the wheel: with power disconnected, install the wheel on the grinder spindle, secure the nut per grinder instructions, tighten firmly (but do not overtighten), and orient the label so it faces you for correct rotation direction.
• Set up the work area: ensure the guard is repositioned to protect the operator, clear the work zone of debris, clamp or secure the workpiece, and wear appropriate PPE (eye & face shield, gloves, hearing protection, and cut-resistant clothing as required).
• Begin the cut: allow the grinder to come to full speed, approach the workpiece gently, maintain a steady feed rate, let the abrasive do the work — avoid forcing the wheel. After cutting, shut off and allow the wheel to stop before placing the tool down.

Q: What makes the BlueFire line of cut-off wheels different from standard aluminum-oxide wheels?
A: The BlueFire wheels use a blend of zirconia alumina and premium aluminum oxide abrasives which deliver up to 2-3× the life and faster cut rate compared to standard wheels.

Q: On what materials is this 4-1/2″ wheel best suited?
A: It is suitable for cutting sheet-metal, pipe, hard and soft carbon steel, and alloys including 400-series stainless steel when matched properly.

Q: What is the maximum RPM for this wheel and why is that important?
A: The wheel is rated for 13,580 RPM at its 4-1/2″ × 0.045″ × 7/8″ size. Using a grinder with higher speed can be unsafe and can cause breakage.

Q: What safety checks should I do before each use of a cut-off wheel?
A: Look for damage (chips, cracks), ensure the wheel is correctly mounted, check the guard is in place and secure, verify the workpiece is clamped, and use correct PPE. Exceeding rated speed or using a damaged wheel risks failure.

Q: How should I store spare cut-off wheels to maintain performance and safety?
A: Store wheels flat (not hung) in a dry environment, avoid exposing them to moisture or impact, and keep them in original packaging until use so they aren’t damaged in transit or storage.