4B2 dish grinding wheels 125x6x2x10x20x32 P B2-01 100% AC4 D 91

4B2 Diamond Grinding Wheel – Dish Type | FEPA D91 (80/63 μm)

4B2 dish grinding wheel for rough sharpening and preparation of tool face surfaces.
Designed for carbide and other hard brittle materials.

Where it is actually used:

Used for face grinding and sharpening at rough stage of machining.
Typical applications include:

• Initial face grinding of end mills and milling cutters
• Sharpening of carbide saw blades
• Preparation of reamers before micron sequence

The dish shape provides accurate contact on flat and angular surfaces.

What it actually does:

Productive material removal with basic control of surface geometry.
Removes material quickly and establishes flatness before finer grinding.

Grain size (D91 ≈ 80/63 μm):

• High stock removal rate
• Typical Ra ~ 0.4–1.0 μm
• Leaves visible grinding marks

In practice:

This is a starting wheel for face grinding.
Used before M63 → M40 → M25 sequence.
Focus is material removal and geometry setup.

Specification:

• Type: 4B2 (dish)
• Abrasive: Synthetic diamond (AC4)
• Grit: FEPA D91 ≈ 80/63 μm (ANSI 170/200)
• Concentration: 100%
• Body: P / A / S / Ap
  (Pressed / Aluminum / Steel / Aluplast)

Body options:

• Pressed: lighter weight, vibration damping, better surface finish
• Aluminum: lightweight with good rigidity, general-purpose solution
• Steel: maximum rigidity for heavy-duty grinding
• Aluplast: balanced weight and rigidity

Why this shape:

• Accurate face contact
• Access to cutting edges
• Suitable for angular surfaces

Use for:

• Face grinding
• Tool sharpening
• Initial grinding

Do not use for:

• Fine finishing (use M63 → M10)
• Polishing
• Steel