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About Counterbores
Create flat-bottomed holes, so your screw heads sit flush, recessed, or slightly raised.
Mil. Spec. Counterbores for Hydraulic Port Holes
These counterbores cut hydraulic port profiles that meet SAE and military specifications for leak-proof construction. They help fasteners maintain seals though pressure bursts, sudden vibrations, and long periods of normal use.
Steel
 |
MS33649 and SAE AS5202 |
Shank | Uncoated | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Thread Size | Series No. | Overall Lg. | Dia. | Type | Lg. | Mil. Spec. | No. of Flutes | Pilot Lg. | Specs. Met | Each | |||
| 3/8"-24 | NB-3 | 5 1/16" | 0.4995" | Round | 2" | MS33649 | 4 | 0.598" | SAE AS5202 | 0000000 | 0000000 | ||
| 3/8"-24 | SAE-3SS | 3 3/4" | 0.5000" | Round | 2" | MS16142 | 4 | 0.473" | SAE J514, SAE J1926/1 | 0000000 | 000000 | ||
| 7/16"-20 | NB-4 | 5 5/32" | 0.4995" | Round | 2" | MS33649 | 4 | 0.671" | SAE AS5202 | 0000000 | 000000 | ||
| 7/16"-20 | SAE-4SS | 3 3/4" | 0.5000" | Round | 2" | MS16142 | 4 | 0.552" | SAE J514, SAE J1926/1 | 0000000 | 000000 | ||
| 1/2"-20 | NB-5 | 5 5/32" | 0.4995" | Round | 2" | MS33649 | 4 | 0.671" | SAE AS5202 | 0000000 | 000000 | ||
| 1/2"-20 | SAE-5SS | 4" | 0.7500" | Round | 2 1/32" | MS16142 | 4 | 0.552" | SAE J514, SAE J1926/1 | 0000000 | 000000 | ||
| 9/16"-18 | NB-6 | 5 3/16" | 0.4995" | Round | 2" | MS33649 | 4 | 0.724" | SAE AS5202 | 0000000 | 000000 | ||
| 9/16"-18 | SAE-6SS | 4" | 0.7500" | Round | 2 1/32" | MS16142 | 4 | 0.614" | SAE J514, SAE J1926/1 | 0000000 | 000000 | ||
| 3/4"-16 | NB-8 | 5 5/16" | 0.4995" | Round | 2" | MS33649 | 4 | 0.849" | SAE AS5202 | 0000000 | 000000 | ||
| 3/4"-16 | SAE-8SS | 4" | 0.7500" | Round | 2 1/32" | MS16142 | 4 | 0.696" | SAE J514, SAE J1926/1 | 0000000 | 000000 | ||
