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CLEVELAND Short-Flute Cobalt Jobber-Length Drill Bit - Short-Flute Cobalt Jobber-Length Drill Bits
CLEVELANDShort-Flute Cobalt Jobber-Length Drill Bits

CLEVELAND Short-Flute Cobalt Jobber-Length Drill Bit

The CLEVELAND Jobber Length Drill Bit (Letter T, MPN C15978) is a short-flute cobalt drill bit with a 135° split point, black oxide finish, and fast spiral geometry. It features a 0.3580-inch diameter, designed for…

SKU 3G-OTH-213670

Also listed as: C 15978 · C-15978

Brand
CLEVELAND
Item
Short-Flute Cobalt Jobber-Length Drill Bit
Category
Short-Flute Cobalt Jobber-Length Drill Bits
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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
C15978
Type
Black Oxide Cobalt, Fast Spiral
Split Point
135°

Technical Documents

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

Product Description

The CLEVELAND Jobber Length Drill Bit (Letter T, MPN C15978) is a short-flute cobalt drill bit with a 135° split point, black oxide finish, and fast spiral geometry. It features a 0.3580-inch diameter, designed for efficient chip evacuation in industrial drilling applications.

Frequently Asked Questions

What is the CLEVELAND C15978 jobber length drill bit used for?

The CLEVELAND C15978 jobber length drill bit is used for drilling precise holes in hard materials like stainless steel and alloy steels. Its 135° split point reduces walking and requires less thrust, making it ideal for production machining and maintenance applications across industrial sectors.

What are the specifications of the CLEVELAND C15978 drill bit?

The CLEVELAND C15978 is a letter T jobber length drill bit with a 0.3580 inch diameter, 135° split point, black oxide cobalt finish, and fast spiral flute design. It is a short-flute cobalt jobber-length drill bit designed for high-performance drilling in tough materials.

Where to buy CLEVELAND C15978 drill bits worldwide?

3G Electric supplies the CLEVELAND C15978 drill bit to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this and other CLEVELAND cutting tools.

How to select the right CLEVELAND jobber length drill bit for my application?

Select the CLEVELAND jobber length drill bit based on material hardness, hole depth, and required finish. For hard metals like stainless steel, choose cobalt with a 135° split point (like the C15978) to reduce thrust and improve accuracy. Match the letter or fractional size to your hole diameter specification.

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 short-flute cobalt jobber-length drill bits. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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Black oxide cobalt drill bit with 135° split point and fast spiral flute design. Letter C size, 0.2420-inch diameter. Suitable for drilling in hard metals and alloy steels in general machining applications
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Black oxide cobalt drill bit with 135° split point and fast spiral flute design. Letter C size, 0.2420-inch diameter. Suitable for drilling in hard metals and alloy steels in general machining applications
Black oxide cobalt jobber-length drill bit with a 135° split point and fast spiral flute design. The 0.3390-inch diameter (Letter R) is suited for drilling in metal and other materials where reduced walking and lower thrust are beneficial. Commonly used in production and maintenance drilling applications
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Black oxide cobalt jobber-length drill bit with a 135° split point and fast spiral flute design. The 0.3390-inch diameter (Letter R) is suited for drilling in metal and other materials where reduced walking and lower thrust are beneficial. Commonly used in production and maintenance drilling applications
CLEVELAND C15982 is a short-flute cobalt jobber-length drill bit with a 0.3770-inch diameter (Letter V). It features a 135° split point, black oxide cobalt finish, and fast spiral flute design. This drill bit is used for drilling in industrial applications, particularly in hard metals and high-temperature conditions
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CLEVELAND C15982 is a short-flute cobalt jobber-length drill bit with a 0.3770-inch diameter (Letter V). It features a 135° split point, black oxide cobalt finish, and fast spiral flute design. This drill bit is used for drilling in industrial applications, particularly in hard metals and high-temperature conditions
CLEVELAND C15977 is a short-flute cobalt jobber-length drill bit with a 0.3480-inch diameter (Letter S). It features a 135° split point, black oxide finish, and fast spiral design for efficient chip evacuation. Suitable for drilling in hard materials such as stainless steel and alloy steels in industrial machining applications
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CLEVELAND C15977 is a short-flute cobalt jobber-length drill bit with a 0.3480-inch diameter (Letter S). It features a 135° split point, black oxide finish, and fast spiral design for efficient chip evacuation. Suitable for drilling in hard materials such as stainless steel and alloy steels in industrial machining applications
This CLEVELAND short-flute cobalt jobber-length drill bit features a 0.2900-inch diameter (Letter L), 135° split point, black oxide cobalt finish, and fast spiral flute design. The split point reduces walking and enables self-centering, while the cobalt construction and fast spiral enhance chip evacuation and heat resistance. Suitable for drilling in hard materials such as stainless steel and high-alloy steels in industrial metalworking applications
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This CLEVELAND short-flute cobalt jobber-length drill bit features a 0.2900-inch diameter (Letter L), 135° split point, black oxide cobalt finish, and fast spiral flute design. The split point reduces walking and enables self-centering, while the cobalt construction and fast spiral enhance chip evacuation and heat resistance. Suitable for drilling in hard materials such as stainless steel and high-alloy steels in industrial metalworking applications
CLEVELAND C15954 is a short-flute cobalt jobber-length drill bit with a 0.2380-inch diameter (Letter B), 135° split point, black oxide finish, and fast spiral design. Suitable for drilling hard materials such as stainless steel and alloy steels in industrial machining and maintenance applications
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CLEVELAND C15954 is a short-flute cobalt jobber-length drill bit with a 0.2380-inch diameter (Letter B), 135° split point, black oxide finish, and fast spiral design. Suitable for drilling hard materials such as stainless steel and alloy steels in industrial machining and maintenance applications

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This 23/64" (0.3594") jobber-length drill bit features a 135° split point, black oxide cobalt finish, and fast spiral flute design. The short-flute construction and cobalt alloy provide hardness for drilling tough materials such as stainless steel and high-temperature alloys. Suitable for industrial machining, metalworking, and maintenance applications
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This 23/64" (0.3594") jobber-length drill bit features a 135° split point, black oxide cobalt finish, and fast spiral flute design. The short-flute construction and cobalt alloy provide hardness for drilling tough materials such as stainless steel and high-temperature alloys. Suitable for industrial machining, metalworking, and maintenance applications
CLEVELAND C15891 is a #51 short-flute cobalt jobber-length drill bit with a 0.0670-inch diameter, 135° split point, black oxide finish, and fast spiral flute design. Suitable for drilling hard materials and deep-hole applications in general machining and maintenance tasks
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CLEVELAND C15891 is a #51 short-flute cobalt jobber-length drill bit with a 0.0670-inch diameter, 135° split point, black oxide finish, and fast spiral flute design. Suitable for drilling hard materials and deep-hole applications in general machining and maintenance tasks
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CLEVELAND C15919 is a 9/64" (0.1406") short-flute cobalt jobber-length drill bit with a 135° split point, black oxide cobalt finish, and fast spiral design. Suitable for general-purpose drilling in metal, stainless steel, and hardened materials. The split point reduces walking, while the black oxide and fast spiral improve chip evacuation and heat resistance in industrial machining applications
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CLEVELAND C15898 is a #45 short-flute cobalt jobber-length drill bit with a 0.0820" diameter, 135° split point, and black oxide finish with fast spiral flute design. Suitable for drilling hard materials such as stainless steel and alloy steels in industrial machining and maintenance applications
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CLEVELAND C15898 is a #45 short-flute cobalt jobber-length drill bit with a 0.0820" diameter, 135° split point, and black oxide finish with fast spiral flute design. Suitable for drilling hard materials such as stainless steel and alloy steels in industrial machining and maintenance applications
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CLEVELAND #4 short-flute cobalt jobber-length drill bit with a 0.2090-inch diameter, 135° split point, black oxide cobalt finish, and fast spiral flute design. Suitable for general-purpose drilling in metal, stainless steel, and hardened materials in production machining and maintenance applications
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CLEVELAND #31 jobber-length drill bit with 0.1200-inch diameter, 135° split point, black oxide cobalt finish, and fast spiral flute design. The short-flute construction provides increased rigidity for drilling in hard materials such as stainless steel and tool steel. The split point reduces walking and allows for precise hole starting without a center punch