The classification system for fixed cutter bits (PDC & diamond bits) consists of four characters.
The first character
- describes the body material and it is either M for matrix body or S for steel body construction.
The second digit
- describes the cutter density
- For PDC bits : ranges from 1 for soft formations to 4 for hard formation
1 refers to 30 or fewer 1/2” cutters
2 refers to 30 to 40 cutters
3 indicates 40 to 50 cutters
4 refers to 50 or more cutters.
- For diamond bits : ranges from 6 for soft formations to 8 for hard formation
6 refers to diamond sizes larger than 3 stones per carat
7 refers to 3 stones to 7 stones per carat
8 refers to sizes smaller than 7 stones per carat.
- Numerals 0, 5 and 9 are reserved for future use.
The third digit
- describes the size or type of cutter.
- For PDC bits
1 indicates cutter larger than 24 mm in diameter
2 represent 14-24 mm,
3 indicates 13.3 mm (1/2”), and
4 is used for the smaller 8 mm in diameter.
- For diamond bits: the third digit represents diamond type
1 indicating natural diamonds
2 to TSP material
3 represents mixed natural diamonds and TSP
4 applies only to the highest density bit, indicating an impregnated diamond bit.
The fourth digit
- gives the basic description of bit’s profile.
1 represents both fishtail PDC bit and ‘flat’ TSP and natural diamond bits.
2 & 3 & 4 indicate increasingly longer bit profiles
|REVISED CLASSIFICATION SYSTEM TABLE (PDC)|