01 — Essential Specifications
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Essential specifications
The facts that matter most when choosing the right product in this family.
02 -- Materials, Applications & Machines
Working compatibility
Materials, applications & machines
Quickly confirm what the tool can cut, the work it is designed to perform, and the equipment it is intended to run on.
Compatible materials
Recommended workpiece materials
- Aluminum
- Non-ferrous metals
- Steel
- Plastics
Recommended applications
Typical jobs and operations
- Mild and medium steel, Aluminum, Brass, Copper, Plastics, Non-ferrous metals Precision countersinking Flat-head fastener seating Deburring pre-drilled holes Assembly and finishing operations Fabrication and maintenance work
- Holemaking
03 -- Complete Technical Specifications
Technical data
Complete technical specifications
Open only the groups you need to confirm construction, dimensions, and operating requirements.
Construction & identification
Tool typeCountersinks
Tool subtypePiloted Countersinks
Detailed styleHSS · 82°
Manufacturer seriesCSK-PILOTED
Series familyCSK
Measurement systemImperial
Tool materialHigh-speed steel
Manufacturer part numberCSK10-1
Dimensions & fit
Size5/16"
Increment1/5 in
Cutting diameter41/64
Overall length2-3/16
Shank diameter3/8
Pack quantity1
Cutting geometry
Countersink angle82.0°
Pilot type5/16
04 -- Why Choose this series
Series advantage
Why choose the CSK-PILOTED series
CSK-PILOTED
Piloted Zero-Flute Accuracy — The integrated pilot follows the existing hole to keep the countersink perfectly centered, producing uniform, professional chamfers with zero chatter and exceptional surface finish.
Features supporting this advantage
- Piloted Zero-Flute Accuracy — The integrated pilot follows the existing hole to keep the countersink perfectly centered, producing uniform, professional chamfers with zero chatter and exceptional surface finish.
- High-speed steel
05 -- Compatibility & What's Included
Compatibility & contents
Confirm the fit before ordering
The systems, models, and components below come directly from the product’s normalized fit data.
Fit details
Pilot type5/16
06 -- Use Notes & Technical Description
Before you use it
Use notes & technical description
Important fit, operating, and care guidance to review before putting the tool to work.
View the complete technical description
Champion CSK10-1 82° HSS Piloted Zero-Flute Countersink | 5/16" Screw x 5/16" Pilot — Weldon-Style Piloted Countersink
The CSK10-1 is an exact 82° HSS piloted zero-flute countersink for 5/16" flat-head screws. Its fixed 5/16" pilot follows the existing hole while the single cutting edge creates a concentric, chatter-resistant countersink for clean fastener seating.
This Champion CSK-PILOTED configuration has a 41/64" body diameter, 3/8" shank and 2-3/16 overall length. The Weldon-style zero-flute design supports controlled material removal, smooth finishes and repeatable alignment in pre-drilled holes.
Technical Specifications
| Manufacturer part number | CSK10-1 |
|---|---|
| Exact screw size | 5/16" flat-head screw |
| Included angle | 82° |
| Tool style | Piloted zero-flute, Weldon-style countersink |
| Body diameter | 41/64" |
| Pilot diameter | 5/16" |
| Shank diameter | 3/8" |
| Overall tool length | 2-3/16 |
| Material | High-speed steel (HSS) |
| Source variant configuration | For screws 5/16" | Shank 3/8" | Pilot 5/16" |
Applications
Use this Champion CSK10-1 for precision countersinking, deburring pre-drilled holes, edge finishing and flat-head screw seating in steel, aluminum, brass, copper, plastics and other suitable non-ferrous materials. It is designed for portable power drills and drill presses where the pilot can engage an existing hole.
Piloted Countersinking Accuracy
The 5/16" pilot helps keep the 41/64" cutting body centered in the pre-drilled hole, reducing wandering and supporting a uniform 82° chamfer. Match the pilot to the hole and the cutter to the exact 5/16" screw size before operation.
Confirm the pilot fits the existing hole, secure the workpiece, use moderate RPM and apply light pressure for a clean finish. Cutting tools may shatter if misused; wear appropriate PPE and follow the machine and tool manufacturer's instructions.
How ordering works
A clear process from order to delivery
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1
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Secure submission
2
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Details confirmed
3
Picking and packing
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4
Tracking provided
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Trackable shipment
5
Delivery to your location
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Dependable delivery
Business purchasing
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