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Aircraft Counterbore - Aircraft Counterbore, 9/16'''', Piloted
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$84.99
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SKU: 549884365
Overview
Designed for pillar bedding work, this piloted counterbore helps you drill stocks with existing screw holes while keeping the cutter centered. The interchangeable pilot system adds flexibility, letting one cutter handle multiple bedding setups and reducing the need for several separate tools. It is a practical choice for builders and gunsmiths looking to add bedding blocks efficiently without fighting tool wander. The included specifications show a 9/16" cutter with a 1/8" pilot hole, so it is suited to a defined bedding task rather than general-purpose drilling.
Why Hunters Choose the Brownells
Piloted Design
Existing screw holes
Supports Accurate
Stock drilling for pillar bedding
Interchangeable Pilots
Add versatility across multiple bedding
Two Cutters
Can handle work that would
Available Popular
Sizes to fit most bedding
Key Features
- Piloted counterbore for accurate drilling in stocks with existing screw holes.
- Helps simplify pillar bedding installations.
- Interchangeable pilots add versatility across bedding tasks.
- Designed to make adding pillar bedding blocks quick and easy.
- 9/16-inch cutter with 1/8-inch pilot hole.
- Counterbore features a 1/4-inch shank and 2-13/16-inch overall length.
Best Used For
- Hunters and gunsmiths installing pillar bedding blocks in stocks with existing screw holes
- Users needing a piloted counterbore to help keep drilling aligned during bedding work
- Shop setups that benefit from interchangeable pilots across multiple bedding applications
- Those looking for a 9/16-inch cutter size for pillar bedding installation tasks
Specifications
| Counterbore Material | HSS Steel |
|---|---|
| Counterbore Shank | 1/4" (6.3mm) |
| Cutter Diameter | 9/16" (14.4mm) |
| Length | 2-13/16" (7.1cm) |
| Pilot Diameter | 1/4" (6.3mm) and 5/16" (7.9mm) |
| Pilot Hole | 1/8" (3.1mm) |
| Pilot Material | Carbon steel |
| Pilot Shank | 1/8" (3.1mm) |
Pros
- Piloted design helps keep the cutter aligned with existing screw holes.
- Supports accurate stock drilling for pillar bedding installations.
- Interchangeable pilots add versatility across multiple bedding applications.
- Two cutters can handle work that would otherwise require six.
- Available in popular sizes to fit most bedding needs.
Considerations & Trade-offs
- Designed for pillar bedding work, so it is specialized rather than a general-purpose counterbore.
- Requires matching pilots and cutters for the intended setup, which adds a small amount of planning before use.
- Sized for existing screw holes and a 1/8" pilot hole, so it is not a universal fit for every stock or bedding job.
- The product is sold as a counterbore component; additional bedding parts may be needed to complete an installation.
Suggested Comparisons
- Pillar bedding tools
- Piloted drill bits
- Counterbores
- Stock bedding accessories
Suggested Accessories
- Pillar bedding blocks
- Drill press accessories
- Replacement pilots
- Cutting fluid
Frequently Asked Questions
What is this counterbore used for?
It is designed to speed up and simplify pillar bedding installations by accurately drilling stocks with existing screw holes.
Does it help keep the cutter from wandering in an existing hole?
Yes. The description says the piloted design allows accurate drilling with no fear of the cutter wandering.
What sizes are listed for the cutter and pilot hole?
The listed cutter size is 9/16" and the pilot hole is 1/8".
What materials are specified in the product data?
The counterbore is listed as HSS steel, and the pilot is listed as carbon steel.
Are interchangeable pilots available for different bedding setups?
Yes. The description says interchangeable pilots provide increased versatility, and pilots and cutters are available in popular sizes to accommodate most bedding needs.