SPECIFICATION SYSTEM
OF BONDED ABRASIVE PRODUCTS

 

Type of
shape		 Dimension Abrasive
type		 Grit
size		 Hardness
grade		 Structure Bond
nature		 Type of
bond		 Maximum
operating
speed
1 175x20x32 67A 462 K 8 V 31 40m/s

 

Grain
Nature of abrasive		 Characteristics Application areas
1A Regular aluminium oxide hard, though grain (braun, grey) For grinding plain and low alloyed steel, cast steel, grey and chilled cast iron.
11A Mixed alumimium oxide special corundum For stainless steel.
2A Microcristalin corundum

white, pale

 For grinding high-speed steel, medium and high alloyed tool steel, chromium hardened surfaces, heat and corrosion resistant steel, general tool grinding.
3A
Z		 Zirconia grey
(on coated abrasive it is usually blue)		 For rough grinding of cast iron, grinding structural, tool steel and stainless steel.
6A White aluminium oxide hard, brittle (white) For grinding unalloyed and alloyed, hardened and unhardened structural and tool steel, heat and corrosion resistant steel, rubber, glass.
7A Pink aluminium oxide hard, tougher and less brittle than 6A For grinding middle and highly alloyed, hardened and unhardened structural and tool steel, heat and corrosion resistant steel.
9A Monocrystalline aluminium oxide hard, though  grain For grinding high speed steel, highly alloyed steel, hardened steel, cromium hardened surfaces, heat and corrosion resistant steel. 
16A Mixed alumimium oxide 1A + 6A Grinding of unalloyed and low alloyed steel, hardened and ungardened structural and tool steels.
67A Mixed alumimium oxide 6A + 7A The same as 7A.
61A Mixed alumimium oxide special corundum For stainless steel.
1C Black silicon carbide hard, rigid, brittle For grinding hard metal, cast iron, non-ferrous metals, aluminium, natural and artificial stones, ceramics, glasses. 
2C Green silicon carbide hard, rigid, brittle For grinding hard metal, technical cheramics, glass.

 

Alakjel Pl. 1, 5, 6, 7, 11, 12, 3101, 27, 41, 35
Szabványban rögzített, alakjelekhez tartozó termékrajzok jelölései.
Méretek A fő méretek megadása. Pl. az 1. alaknál korongátmérő x vastagság x furatátmérő (mm); más alkjaleknél pl. falvastagság, fenékvastagság stb.
         
Grit size

The finer the grains the larger the grit size number. The grit size can be supplemented with additional number to indicate grit combinations. We recommend using a finer grain to obtain smoother surface.
16, 20, 22, 24 60, 36, 40, 46, 54, 60 70, 80, 90, 700, 120, 150
coarse medium fine
Hardness grades

The hardness grade of abrasive tools characterizes how strongly both the grain and the bond resists the forces causing the breakage outof the grain from the tools emerging during the grinding process. Harder materials are normally ground with softer hardness grade tools.
E, F, G H, I, J, K L, M, N, O P, Q, R, S
very soft soft medium hard
Structure

The structure of abrasive tools depends on the volumetric ratio of abrasive grain, bond and pores. The pores create room for the chips and can help the removal of the chips from the working area, can enhance the cooling and the flushing of the tool and the work piece. We normally recommend open structure tools for soft materials that are difficult to grind.
3, 4 5, 6, 7, 8 9, 10 11, 12, 13
closed medium open very open
Nature of bond

The vitrified bonded wheels are resistant to chemical and can be stored for an unlimited period of time. The resinoid bonded wheels are more flexible, and better for dynamic, forceful usage. Glass fibre reinforcement can further increase the resistance of the wheels to dynamic forces; an important factor if heavy usage is involved. The resinoid bonded wheels should be used within 3 years from the production date!    
V B BF
vitrified bonded resinoid bonded glass fibre reinforced resinoid bonded
Type of bond

It gives the Granit wheel proprietory identification of the bond type. Figure "8" refers to the red color of the bonding. For other bond types, the color of the tool is similar to the color of the abrasive grain.
e.g. 38, 31, …etc.