API Standards For Rock Bits And PDC Bits
- Details
- Category: Tungsten Information
API standards, as established by the American Petroleum Institute, enable drilling professionals the world over to communicate clearly.
American Petroleum Institute Standards for PDC and Rock Bit Tolerances
|
Bit Size (In.) |
O.D. Tolerance (In.) |
O.D. Tolerance (In.) |
|
6 3/4" and smaller |
-0.015 to +0.00 PDC |
-0.0 to +1/32 Rock Bit |
|
6 25/32" to 9" |
-0.020 to +0.00 PDC |
-0.0 to +1/32 Rock Bit |
|
9 1/32" to 13 3/4" |
-0.030 to +0.00 PDC |
-0.0 to +1/32 Rock Bit |
|
17 17/32" and larger |
-0.063 to +0.00 PDC |
-0.0 to +3/32 Rock Bit |
|
9 1/32" to 13 3/4" |
-0.030 to +0.00 PDC |
-0.0 to +1/32 Rock Bit |
|
13 25/32" to 17 1/2" |
-0.045 to +0.00 PDC |
-0.0 to +1/16 Rock Bit |
PDC bits are gauged by either a "go" gauge or a "no go" gauge.
A "no go"gauge is used to ensure a bit is not smaller than allowed and, as the name implies, it should not go or slip down the entire length of the bit. A "go gauge ensures a bit is not larger than allowed and should slip down the entire bit.
Rock Bit Size and API Standard Connection
3 1/2" to 4 1/2" drill bits - 2 3/8" API Reg. pin
4 5/8" to 5 1/2" drill bits - 2 7/8" API Reg. pin
5 5/8" to 7 3/8" drill bits - 3 1/2" API Reg. pin
Number of Nozzles
|
Nozzle |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
|
7 |
.0376 |
.0752 |
.1127 |
.1503 |
.1877 |
.2255 |
.2631 |
.3007 |
|
8 |
.0491 |
.0982 |
.1473 |
.1963 |
.2454 |
.2945 |
.3435 |
.3927 |
|
9 |
.0621 |
.1242 |
.1864 |
.2485 |
.3106 |
.3728 |
.4249 |
.4970 |
|
10 |
.0767 |
.1534 |
.2301 |
.3060 |
.3835 |
.4602 |
.5369 |
.6136 |
|
11 |
.0928 |
.1856 |
.2784 |
.3712 |
.4640 |
.5568 |
.6496 |
.7424 |
|
12 |
.1104 |
.2209 |
.3313 |
.4418 |
.5522 |
.6627 |
.7731 |
.8836 |
|
13 |
.1296 |
.2592 |
.3889 |
.5185 |
.6481 |
.7777 |
.9073 |
1.0370 |
|
14 |
.1503 |
.3007 |
.4510 |
.6013 |
.7517 |
.9020 |
1.0523 |
1.2026 |
|
15 |
.1726 |
.3451 |
.5177 |
.6903 |
.8629 |
1.0354 |
1.2080 |
1.3806 |
|
16 |
.1963 |
.3927 |
.5890 |
.7854 |
.9817 |
1.1781 |
1.3744 |
1.5708 |
|
18 |
.2485 |
.4970 |
.7455 |
.9940 |
1.2425 |
1.4910 |
1.7395 |
1.9880 |
|
20 |
.3068 |
.6136 |
.9204 |
1.2272 |
1.5340 |
1.8408 |
2.1476 |
2.4544 |
|
|
.3712 |
.7424 |
1.1137 |
1.4849 |
1.8561 |
2.2273 |
2.5986 |
2.9698 |
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