Diameter stock – The amount of stock on the outside diameter (OD) of a bushing is based on the OAL (over all length) of the blank. Grind stock will be added to the finished diameter of a blank as shown in the following chart:
| Blank OAL | Min. OD stock | Max. OD stock |
| 3.000” or shorter | +.018” | +.026” |
| 3.001” – 11.999” | +.021” | +.029” |
| 12.000” or longer | +.024” | +.032” |
Note: For stepped OD’s all diameters will be stocked according to the OAL of the blank.
Length stock – Due to the shrinkage variation, the amount of stock on the length of a blank increases as the OAL of the blank increases. Grind stock will be added to the finished length of a blank as shown in the following chart:
| Blank OAL | Min. length stock | Max. length stock |
| Length up to 2.000” | +.010” | +.030” |
| 2.001” – 3.000” | +.010” | +.040” |
| 3.001” – 4.000” | +.010” | +.050” |
| 4.001” – 5.000” | +.010” | +.060” |
| 5.001” – 6.000” | +.010” | +.070” |
| 6.001” – 8.000” | +.010” | +.080” |
| 8.001” – 10.000″ | +.010” | +.090” |
| 10.001” – 11.999” | +.010” | +.100” |
| 12.000” – 14.000” | +.200” | +.400” |
Inside diameter (ID) – The grind stock on the inside diameter (ID) increases as the OAL of the blank increases. Grind stock will be added to the ID as shown in the following chart:
| Blank OAL | Min. ID stock | Max. ID stock |
| 3.000” or shorter | -.018” | -.026” |
| 3.001” – 11.999” | -.021” | -.029” |
| 12.000” or longer | -.024” | -.032” |
Note: For stepped ID’s all OD’s will be stocked according to the OAL of the blank.
Warpage allowance – All bushings are checked 100% for warpage. Warpage is measured in one of two methods:
- Blanks with a single OD. – Blanks are checked on a flat plate with a feeler gauge. Maximum warpage allowed is based on the OAL/OD grind stock as shown in the following chart:
| Blank OAL | Max. warpage |
| 3.000” or shorter | .006” |
| 3.001” – 11.999” | .007” |
| 12.000” or longer | .008” |
Note: Allowable warpage may be adjusted based on the actual rough blank diameter. To do so: first subtract the finish diameter from the actual rough blank diameter to determine the amount of grind stock. Divide the actual grind stock by 3 and round this figure down to 3 decimal places. Please remember that .008in is the maximum allowable warpage regardless of the amount of grind stock.
2. Blanks with multiple ODs. – Blanks are checked on a center fixture or roller plate with an indicator. Maximum warpage (TIR) allowed is based on the OAL/OD grind stock as shown in the following chart:
| Blank OAL | Max. TIR |
| 3.000” or shorter | .012” |
| 3.001” – 11.999” | .014” |
| 12.000” or longer | .016” |
Note: Allowable TIR may be adjusted based on the actual rough blank diameter. To do so: first subtract the finish diameter from the actual rough blank diameter to determine the amount of grind stock. Divide the actual grind stock by 3 and round this figure down to 3 decimal places then multiply by 2. The result is the maximum allowable TIR. Please remember that .016” is the maximum allowable warpage regardless of the amount of grind stock.