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CLEVELAND 8-Piece High-Speed Steel Built-in-Pilot Counterbore Set - Built-in-Pilot Counterbore Sets
CLEVELANDBuilt-in-Pilot Counterbore Sets

CLEVELAND 8-Piece High-Speed Steel Built-in-Pilot Counterbore Set

The CLEVELAND Counterbore Set is an 8-piece, high-speed steel built-in-pilot counterbore set (MPN C91770). It is a standard counterbore type from the CLEVELAND brand.

SKU 3G-OTH-186171

Also listed as: C 91770 · C-91770

Brand
CLEVELAND
Item
8-Piece High-Speed Steel Built-in-Pilot Counterbore Set
Category
Built-in-Pilot Counterbore Sets
Available to Order
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

CLEVELAND
Manufacturer Part Number
C91770
Counterbore Type
Standard

Technical Documents

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

Product Description

The CLEVELAND Counterbore Set is an 8-piece, high-speed steel built-in-pilot counterbore set (MPN C91770). It is a standard counterbore type from the CLEVELAND brand.

Frequently Asked Questions

What is the CLEVELAND Counterbore Set used for?

The CLEVELAND Counterbore Set is used to enlarge the top of a pre-drilled hole to create a flat-bottomed recess for a bolt head or nut. It is commonly applied in metalworking and assembly operations where flush fastening is required, such as in automotive, aerospace, and general manufacturing.

What are the specifications of the CLEVELAND Counterbore Set?

The CLEVELAND Counterbore Set (MPN C91770) is an 8-piece set made of high-speed steel. It features a built-in-pilot design and is classified as a standard counterbore type. The set is manufactured by CLEVELAND and is suitable for general-purpose counterboring in ferrous and non-ferrous materials.

Where to buy the CLEVELAND Counterbore Set worldwide?

You can source the CLEVELAND Counterbore Set worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time; we supply genuine CLEVELAND tooling to procurement teams and engineers globally.

How to select the right CLEVELAND Counterbore Set for your application?

To select the right CLEVELAND Counterbore Set, match the pilot diameter to your pre-drilled hole size and ensure the counterbore diameter accommodates your fastener head. The 8-piece set covers common sizes. For best results, use with a suitable cutting fluid and secure workpiece. Consult your application's material and tolerance requirements.

Used in

Common applications for CLEVELAND
Aerospace manufacturing — CLEVELAND NAS-spec aircraft extension drills for drilling fastener holes in aluminum airframe panels.
Bridge construction — CLEVELAND Morse-taper shank bridge reamers for enlarging bolt holes in structural steel.
Automotive production — CLEVELAND chucking reamers for precision finishing of engine component bores.
General metalworking — CLEVELAND single-flute countersinks for deburring holes in mild steel parts.
Tool and die making — CLEVELAND interchangeable-pilot counterbores for creating recesses for socket head cap screws.
Maintenance repair — CLEVELAND cobalt aircraft extension drills for drilling hardened steel in equipment repairs.

CLEVELAND Products

3G Electric supplies CLEVELAND built-in-pilot counterbore sets. 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
Counterbore pilot designed to guide counterbore cutters for creating recessed holes for bolt heads or nuts. Features a 1/4 in pilot hole diameter and 2 3/16 in overall length. Used in machining operations to ensure concentric alignment and precise depth control
CLEVELAND
Counterbore pilot designed to guide counterbore cutters for creating recessed holes for bolt heads or nuts. Features a 1/4 in pilot hole diameter and 2 3/16 in overall length. Used in machining operations to ensure concentric alignment and precise depth control
Counterbore pilot designed to guide counterbore tools for accurate, concentric recesses. Features a 3/8 in pilot hole diameter and 2 11/16 in overall length. Used in machining operations to ensure precise fastener seating
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Counterbore pilot designed to guide counterbore tools for accurate, concentric recesses. Features a 3/8 in pilot hole diameter and 2 11/16 in overall length. Used in machining operations to ensure precise fastener seating
Counterbore pilot for guiding counterbore cutters in metalworking and machining applications. Features a 3/8 in pilot hole diameter and 2 11/16 in overall length. Ensures concentric alignment when recessing bolt heads or nuts
CLEVELAND
Counterbore pilot for guiding counterbore cutters in metalworking and machining applications. Features a 3/8 in pilot hole diameter and 2 11/16 in overall length. Ensures concentric alignment when recessing bolt heads or nuts
Counterbore pilot for guiding counterbore cutters in machining operations. Features a 5/16 in pilot hole diameter and 2 13/32 in overall length. Ensures concentric alignment when creating recessed flat-bottom holes for socket-head cap screws or bolt heads
CLEVELAND
Counterbore pilot for guiding counterbore cutters in machining operations. Features a 5/16 in pilot hole diameter and 2 13/32 in overall length. Ensures concentric alignment when creating recessed flat-bottom holes for socket-head cap screws or bolt heads
This standard-type interchangeable-pilot counterbore is made from high-speed steel and has a 13/32 in bore diameter. It accommodates pilot diameters from 3/16 in to 11/32 in. Used in metalworking to enlarge pre-drilled holes for flush seating of bolt heads or nuts
CLEVELAND
This standard-type interchangeable-pilot counterbore is made from high-speed steel and has a 13/32 in bore diameter. It accommodates pilot diameters from 3/16 in to 11/32 in. Used in metalworking to enlarge pre-drilled holes for flush seating of bolt heads or nuts
Counterbore pilot used to guide and align counterbore cutters for enlarging drilled holes to precise depths. Features a 7/16 in pilot hole diameter and 3 in overall length. Ensures concentric alignment with existing pilot holes for creating recessed seats for bolt heads or fasteners in metalworking and machining applications
CLEVELAND
Counterbore pilot used to guide and align counterbore cutters for enlarging drilled holes to precise depths. Features a 7/16 in pilot hole diameter and 3 in overall length. Ensures concentric alignment with existing pilot holes for creating recessed seats for bolt heads or fasteners in metalworking and machining applications

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This 9-piece counterbore set from CLEVELAND features high-speed steel construction and a built-in-pilot design. It is used to enlarge the top of pre-drilled holes to create flat-bottomed recesses for socket-head cap screws or bolts. Suitable for general-purpose counterboring in ferrous and non-ferrous materials
CLEVELAND
This 9-piece counterbore set from CLEVELAND features high-speed steel construction and a built-in-pilot design. It is used to enlarge the top of pre-drilled holes to create flat-bottomed recesses for socket-head cap screws or bolts. Suitable for general-purpose counterboring in ferrous and non-ferrous materials