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KEO Counterbore: For M4 Screw, 8 mm Bore Dia, 4.3 mm Pilot Dia - Built-in-Pilot Counterbores
KEOBuilt-in-Pilot Counterbores

KEO Counterbore: For M4 Screw, 8 mm Bore Dia, 4.3 mm Pilot Dia

The KEO Counterbore (MPN 902-000-050) is a standard built-in-pilot counterbore designed for M4 screws, featuring an 8 mm bore diameter and a 4.3 mm pilot diameter, constructed from cobalt. This tool is manufactured…

SKU 3G-OTH-202268

Also listed as: 902000050 · 902 000 050

Brand
KEO
Item
Counterbore: For M4 Screw, 8 mm Bore Dia, 4.3 mm Pilot Dia
Category
Built-in-Pilot Counterbores
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Technical Specifications

KEO
Manufacturer Part Number
902-000-050

Technical Documents

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KEO Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The KEO Counterbore (MPN 902-000-050) is a standard built-in-pilot counterbore designed for M4 screws, featuring an 8 mm bore diameter and a 4.3 mm pilot diameter, constructed from cobalt. This tool is manufactured by KEO and is intended for industrial counterboring applications.

Frequently Asked Questions

What is the KEO Counterbore 902-000-050 used for?

The KEO Counterbore 902-000-050 is used to create a flat-bottomed recess for M4 screw heads in metal or plastic parts. Its built-in pilot aligns the tool for accurate counterboring, making it essential in machining, tooling, and assembly operations across industrial departments.

What are the specifications of the KEO Counterbore 902-000-050?

This KEO Counterbore has an 8 mm bore diameter and a 4.3 mm pilot diameter, designed for M4 screws. It is a standard built-in-pilot type made from cobalt, with manufacturer part number 902-000-050. KEO tools are known for durability in precision machining.

Where to buy the KEO Counterbore 902-000-050 worldwide?

3G Electric supplies the KEO Counterbore 902-000-050 to customers worldwide. We handle full logistics, customs clearance, and delivery, ensuring you receive the correct tool for your application. Contact us for availability and lead time on this cobalt counterbore.

How to select the correct KEO Counterbore for M4 screws?

To select the correct KEO Counterbore for M4 screws, match the bore diameter to the screw head size (8 mm) and the pilot diameter to the screw body (4.3 mm). Ensure the tool is cobalt for heat resistance. 3G Electric can help source the right KEO tool for your job.

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 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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Compatible alternatives & equivalents

Cross-referenced by specification & description
KEO Counterbore: For M4 Screw, 8 mm Bore Dia, 4.5 mm Pilot Dia, Cobalt (MPN 902-000-051)
KEO
KEO Counterbore: For M4 Screw, 8 mm Bore Dia, 4.5 mm Pilot Dia, Cobalt (MPN 902-000-051)
KEO Counterbore: For M4 Screw, 8 mm Bore Dia, 3.3 mm Pilot Dia, Cobalt (MPN 902-000-049)
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KEO Counterbore: For M4 Screw, 8 mm Bore Dia, 3.3 mm Pilot Dia, Cobalt (MPN 902-000-049)
This built-in-pilot counterbore creates a flat-bottomed recess for M4 screw heads. It is used in machining and assembly operations to achieve a flush screw fit in metal or plastic workpieces. The tool is made from TiN coated cobalt for wear resistance
KEO
This built-in-pilot counterbore creates a flat-bottomed recess for M4 screw heads. It is used in machining and assembly operations to achieve a flush screw fit in metal or plastic workpieces. The tool is made from TiN coated cobalt for wear resistance
This built-in-pilot counterbore is made of TiN coated cobalt. It has an 8 mm bore diameter and a 4.3 mm pilot diameter. Used to create flat-bottomed recesses for screw heads in metal or plastic workpieces during machining and assembly operations
KEO
This built-in-pilot counterbore is made of TiN coated cobalt. It has an 8 mm bore diameter and a 4.3 mm pilot diameter. Used to create flat-bottomed recesses for screw heads in metal or plastic workpieces during machining and assembly operations
KEO Counterbore: For M5 Screw, 10 mm Bore Dia, 4.2 mm Pilot Dia, Cobalt (MPN 902-000-052)
KEO
KEO Counterbore: For M5 Screw, 10 mm Bore Dia, 4.2 mm Pilot Dia, Cobalt (MPN 902-000-052)
Built-in-pilot counterbore for creating flat-bottomed recesses for M4 screw heads. Features a 3.3 mm pilot diameter and 8 mm bore diameter. Constructed from TiN coated cobalt for wear resistance. Used in metalworking and machining applications requiring precise fastener seating
KEO
Built-in-pilot counterbore for creating flat-bottomed recesses for M4 screw heads. Features a 3.3 mm pilot diameter and 8 mm bore diameter. Constructed from TiN coated cobalt for wear resistance. Used in metalworking and machining applications requiring precise fastener seating

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This built-in-pilot counterbore is designed for use with 7/16" screws, featuring a 21/32 in bore diameter and a 0.437 in pilot diameter. Constructed from cobalt, it creates flat-bottomed recesses for flush screw seating in metalworking and machining applications
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Built-in-pilot counterbore for creating flat-bottomed recesses for M6 screw heads. Features 11 mm bore diameter and 6.4 mm pilot diameter. Constructed from TiN coated cobalt for wear resistance. Used in metalworking and machining operations requiring precise fastener seating
Built-in-pilot counterbore for creating flat-bottomed recesses for 7/16" screw heads. Features a 21/32 in bore diameter and 0.437 in pilot diameter. Constructed from AlTiN coated cobalt for wear resistance. Suitable for machining operations requiring precise countersinking in metalworking
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Built-in-pilot counterbore for creating flat-bottomed recesses for 7/16" screw heads. Features a 21/32 in bore diameter and 0.437 in pilot diameter. Constructed from AlTiN coated cobalt for wear resistance. Suitable for machining operations requiring precise countersinking in metalworking
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Built-in-pilot counterbore for M3.5 screws, with a 6.5 mm bore diameter and 3.9 mm pilot diameter. Constructed from TiN coated cobalt for wear resistance. Used in machining operations to create a flat-bottomed recess for screw heads, allowing flush seating in metal or other materials