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KEO Built-in-Pilot Counterbore for M4 Screws, 8 mm Bore, 4.5 mm Pilot, Cobalt - Built-in-Pilot Counterbores
KEOBuilt-in-Pilot Counterbores

KEO Built-in-Pilot Counterbore for M4 Screws, 8 mm Bore, 4.5 mm Pilot, Cobalt

The KEO Counterbore (MPN 902-000-051) is a standard built-in-pilot counterbore designed for M4 screws, featuring an 8 mm bore diameter and a 4.5 mm pilot diameter. It is constructed from cobalt and manufactured by KEO.

SKU 3G-OTH-202270

Also listed as: 902000051 · 902 000 051

Brand
KEO
Item
Built-in-Pilot Counterbore for M4 Screws, 8 mm Bore, 4.5 mm Pilot, Cobalt
Category
Built-in-Pilot Counterbores
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Local availability & support — the Philippines

Delivery
5–8 business days door-to-door; Bureau of Customs clearance typically 2–4 business days.
Payment
Invoicing in PHP or USD. Bank transfer and corporate PO accepted.
Ships to
Manila, Quezon City, Cebu, Davao, Batangas

Technical Specifications

KEO
Manufacturer Part Number
902-000-051

Technical Documents

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

Product Description

The KEO Counterbore (MPN 902-000-051) is a standard built-in-pilot counterbore designed for M4 screws, featuring an 8 mm bore diameter and a 4.5 mm pilot diameter. It is constructed from cobalt and manufactured by KEO.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the KEO Counterbore 902-000-051 used for?

The KEO Counterbore 902-000-051 is used to create a flat-bottomed recess for M4 screw heads in metal or plastic workpieces. It is commonly applied in machining and assembly operations where a flush or countersunk screw fit is required, ensuring proper seating and load distribution.

What are the specifications of the KEO Counterbore 902-000-051?

The KEO Counterbore 902-000-051 is a standard built-in-pilot counterbore for M4 screws. It has an 8 mm bore diameter and a 4.5 mm pilot diameter. The tool is made from cobalt for durability and is manufactured by KEO under MPN 902-000-051.

Where to buy the KEO Counterbore 902-000-051 worldwide?

You can source the KEO Counterbore 902-000-051 through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations, ensuring the tool reaches your facility reliably.

How to select the correct KEO counterbore for M4 screws?

To select the correct KEO counterbore for M4 screws, match the pilot diameter to the screw's clearance hole size (4.5 mm for M4) and the bore diameter to the screw head size (8 mm). Ensure the tool is cobalt for heat resistance. KEO offers standard built-in-pilot designs for precise alignment.

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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Cross-referenced by specification & description
This built-in-pilot counterbore is designed for M4 screws, with an 8 mm bore diameter and a 4.3 mm pilot diameter. Constructed from cobalt, it creates flat-bottomed recesses for screw heads in metal or plastic parts. The integral pilot ensures accurate alignment during counterboring operations in machining and assembly applications
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This built-in-pilot counterbore is designed for M4 screws, with an 8 mm bore diameter and a 4.3 mm pilot diameter. Constructed from cobalt, it creates flat-bottomed recesses for screw heads in metal or plastic parts. The integral pilot ensures accurate alignment during counterboring operations in machining and assembly applications
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This built-in-pilot counterbore creates a flat-bottomed recess for M5 screw heads. It features a 10 mm bore diameter and a 4.2 mm pilot diameter, and is made from cobalt. Used in machining and assembly operations to ensure flush screw seating and load distribution in metal or plastic workpieces
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
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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
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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
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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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
Standard built-in-pilot counterbore designed for M10 screws. Features an 18 mm bore diameter and an 8.5 mm pilot diameter. Constructed from cobalt. Used in machining to create flat-bottomed recesses for screw heads, ensuring flush assembly
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Standard built-in-pilot counterbore designed for M10 screws. Features an 18 mm bore diameter and an 8.5 mm pilot diameter. Constructed from cobalt. Used in machining to create flat-bottomed recesses for screw heads, ensuring flush assembly

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This KEO built-in-pilot counterbore is designed for use with 1/4 in screws, featuring a 3/8 in bore diameter and a 0.25 in pilot diameter. Constructed from cobalt, it creates a flat-bottomed recess for bolt heads or screws to sit flush with or below the workpiece surface. Suitable for general machining and metalworking applications requiring precise counterboring operations
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This KEO built-in-pilot counterbore is designed for use with 1/4 in screws, featuring a 3/8 in bore diameter and a 0.25 in pilot diameter. Constructed from cobalt, it creates a flat-bottomed recess for bolt heads or screws to sit flush with or below the workpiece surface. Suitable for general machining and metalworking applications requiring precise counterboring operations
Built-in-pilot counterbore for creating flat-bottomed recesses for socket-head cap screws. Features a 20 mm bore diameter and 14 mm pilot diameter. Constructed from TiN coated cobalt for wear resistance. Commonly used in machining, fixture building, and industrial assembly
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This built-in-pilot counterbore is designed for M3.5 screws, with a 6.5 mm bore diameter and a 3.7 mm pilot diameter. Made from cobalt, it creates recessed cylindrical holes for screw heads in machining and metalworking applications
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This built-in-pilot counterbore is designed for M3.5 screws, with a 6.5 mm bore diameter and a 3.7 mm pilot diameter. Made from cobalt, it creates recessed cylindrical holes for screw heads in machining and metalworking applications
This KEO counterbore is a standard-type cutting tool designed for 5/8" screws. It features a 15/16 in bore diameter and a 0.625 in pilot diameter, constructed from cobalt material. Used in metalworking and machining to create flat-bottomed recesses for bolt heads or nuts, allowing them to sit flush with or below the workpiece surface
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This KEO counterbore is a standard-type cutting tool designed for 5/8" screws. It features a 15/16 in bore diameter and a 0.625 in pilot diameter, constructed from cobalt material. Used in metalworking and machining to create flat-bottomed recesses for bolt heads or nuts, allowing them to sit flush with or below the workpiece surface
This built-in-pilot counterbore is designed for #10 screws, with a 5/16 in bore diameter and a 0.19 in pilot diameter. Made from cobalt, it is used in machining operations to create recessed holes for screw heads, with the built-in pilot ensuring alignment. Typical applications include industrial machining of steel and cast iron
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This built-in-pilot counterbore is designed for #10 screws, with a 5/16 in bore diameter and a 0.19 in pilot diameter. Made from cobalt, it is used in machining operations to create recessed holes for screw heads, with the built-in pilot ensuring alignment. Typical applications include industrial machining of steel and cast iron
This built-in-pilot counterbore is designed for creating flat-bottomed recesses for M4 screw heads. The 8 mm bore diameter and 3.3 mm pilot diameter ensure concentric alignment with pre-drilled holes. Constructed from cobalt, it is suitable for counterboring in metal and plastic parts in machining and fabrication applications
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This built-in-pilot counterbore is designed for creating flat-bottomed recesses for M4 screw heads. The 8 mm bore diameter and 3.3 mm pilot diameter ensure concentric alignment with pre-drilled holes. Constructed from cobalt, it is suitable for counterboring in metal and plastic parts in machining and fabrication applications
This standard-type counterbore creates a flat-bottomed recess for 3/8" screw heads, allowing them to sit flush with or below the workpiece surface. It features a 37/64 in bore diameter and a 0.375 in pilot diameter, constructed from cobalt material. Suitable for general metalworking and machining applications requiring precision countersinking
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This standard-type counterbore creates a flat-bottomed recess for 3/8" screw heads, allowing them to sit flush with or below the workpiece surface. It features a 37/64 in bore diameter and a 0.375 in pilot diameter, constructed from cobalt material. Suitable for general metalworking and machining applications requiring precision countersinking
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