4B2 dish grinding wheels 125x6x2x10x20x32 A B2-01 100% ACH M 25

4B2 Diamond Grinding Wheel – Dish Type | FEPA M25 (28/20 μm)

4B2 dish grinding wheel for 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 the initial finishing stage.
Typical applications include:

• Face grinding of end mills and milling cutters
• Sharpening of carbide saw blades
• Preparation of reamers before fine finishing

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

What it actually does:

Productive material removal with initial surface refinement.
Establishes geometry and removes marks from previous grinding stages.

Grain size (M25 ≈ 28/20 μm):

• Higher stock removal than finer micron grits
• Typical Ra ~ 0.15–0.30 μm
• Prepares surface for M20 → M16 → M10 sequence

In practice:

This is the entry step of finishing process.
Used after rough grinding and before M20.
Focus is productivity with controlled geometry preparation.

Specification:

• Type: 4B2 (dish)
• Abrasive: Synthetic diamond (АСН)
• Grit: FEPA M25 ≈ 28/20 μm (ANSI ~600–800)
• 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 finishing

Do not use for:

• Heavy rough grinding
• Final polishing (use M10)
• Steel