IMPA: 630255

Cobalt Straight Shank Twist Drill Set for Marine & Shipboard Metalwork

Our straight shank twist drill set is engineered for reliable performance in demanding marine environments. Made from high-speed steel with cobalt alloy, these bits offer excellent heat resistance and cutting edge retention when drilling through stainless steel, mild steel, cast iron, and other tough alloys commonly found on ships.

Each set contains a range of precision-ground drill bits from 1/16" to 1/4" (or metric equivalent), with a straight shank design that fits standard drill chucks. The cobalt-enhanced material ensures longer tool life and cleaner holes, even in hard-to-machine metals used in marine fabrication and maintenance.

Ideal for ship chandlers, boatyards, and vessel maintenance crews, this drill set meets the requirements of IMPA code 630255 and comes in a durable storage case to keep your cutting tools organized and protected on board.

Key Features

Technical Specifications

MaterialHigh-Speed Steel with 5% Cobalt (HSS-Co)
Shank TypeStraight Round
Set Size19 pieces (assorted sizes from 1/16" to 1/4")
Point Angle135° split point for self-centering
CoatingNone (bare HSS-Co)
CompatibilityHand drills, drill presses, and machining centers
StandardsConforms to IMPA 630255

Frequently Asked Questions

What materials can this drill set handle?

The cobalt HSS bits are ideal for drilling stainless steel, hardened steel, cast iron, and other ferrous alloys commonly used in marine applications.

Are these drill bits suitable for use with a hand drill?

Yes, the straight shank design fits standard 3/8" and 1/2" drill chucks, making them compatible with most handheld drills and drill presses.

What is the benefit of cobalt steel for marine use?

Cobalt steel retains hardness at higher temperatures, reducing heat buildup and extending tool life, which is essential for drilling tough marine-grade metals.

Is a storage case included with the set?

Yes, the set comes in a rugged, organized case to keep the drill bits protected and easy to access during shipboard maintenance.

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