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KEO Counterbore: For 5/16" Screw, 1/64" Oversized, 31/64 in Bore Dia - Oversized Built-in-Pilot Counterbores
KEOOversized Built-in-Pilot Counterbores

KEO Counterbore: For 5/16" Screw, 1/64" Oversized, 31/64 in Bore Dia

The KEO Counterbore is an oversized built-in-pilot counterbore designed for 5/16" screws. It features a 1/64" oversized bore diameter of 31/64" and a pilot diameter of 0.328". This tool is identified by manufacturer…

SKU 3G-OTH-184268

Brand
KEO
Item
Counterbore: For 5/16" Screw, 1/64" Oversized, 31/64 in Bore Dia
Category
Oversized Built-in-Pilot Counterbores
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Technical Specifications

KEO
Manufacturer Part Number
902-000-129
Bore Dia
31/64 in
Oversized
1/64"
Pilot Dia
0.328 in
Counterbore Type
Oversized
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KEO Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The KEO Counterbore is an oversized built-in-pilot counterbore designed for 5/16" screws. It features a 1/64" oversized bore diameter of 31/64" and a pilot diameter of 0.328". This tool is identified by manufacturer part number 902-000-129.

Frequently Asked Questions

What is a KEO oversized counterbore used for?

A KEO oversized counterbore creates a flat-bottomed recess for a 5/16" screw head, allowing it to sit flush with or below the workpiece surface. The 1/64" oversized bore provides clearance for fasteners with slightly oversized heads, common in machining and metalworking applications.

What are the specifications of the KEO counterbore 902-000-129?

The KEO counterbore 902-000-129 has a 31/64 in bore diameter, a 0.328 in pilot diameter, and is oversized by 1/64". It is designed for 5/16" screws and is a built-in-pilot type. The manufacturer part number is 902-000-129.

Where to buy KEO counterbore 902-000-129 worldwide?

3G Electric supplies the KEO counterbore 902-000-129 to customers worldwide. We handle full logistics, customs clearance, and delivery for global orders. Contact us to source this tool for your industrial machining needs.

How to select the correct KEO counterbore for a 5/16" screw?

Select a KEO counterbore with a pilot diameter matching your existing hole (0.328 in for this model) and a bore diameter that accommodates the screw head. The 1/64" oversized version provides extra clearance for fasteners with slightly larger heads, ensuring proper seating.

Used in

Common applications for KEO
Metalworking — KEO plain-tip center drills for creating accurate starting points in lathe operations
Automotive manufacturing — KEO bell-tip center drills for countersinking holes in engine components
Aerospace machining — KEO radius-tip center drills for reducing stress risers in critical parts
General machining — KEO keyseat cutters for milling keyways in shafts and gears
Tool and die making — KEO TiN-coated center drills for extended tool life in hardened steels
Precision engineering — KEO cobalt center drills for high-temperature alloy applications

KEO Products

3G Electric supplies KEO oversized built-in-pilot counterbores. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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