4B2 dish grinding wheels 150x6x3x12x20x32 A B2-01 100% AC4 D 126

4B2 Diamond Grinding Wheel – Dish Type | FEPA D126 (125/100 μm)

4B2 dish grinding wheel for heavy 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 early rough stage where high material removal is required.
Typical applications include:

• Rough face grinding of end mills and milling cutters
• Sharpening of carbide saw blades from solid or pre-machined state
• Preparation before D107 → D91 sequence

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

What it actually does:

Very aggressive material removal with basic geometry control.
Quickly removes bulk material and establishes initial flat surface.

Grain size (D126 ≈ 125/100 μm):

• Very high stock removal rate
• Typical Ra ~ 0.8–1.5 μm
• Leaves deep and visible grinding marks

In practice:

This is a primary roughing wheel.
Used before D107 → D91 → M63 sequence.
Focus is productivity and fast material removal.

Specification:

• Type: 4B2 (dish)
• Abrasive: Synthetic diamond (AC4)
• Grit: FEPA D126 ≈ 125/100 μm (ANSI 120/140)
• 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
• Heavy rough grinding

Do not use for:

• Finishing operations (use D107 → M10)
• Polishing
• Steel