115-Piece M35 Cobalt Drill Bit Set – Fractional, Letter & Number Sizes with Heavy-Duty Metal Index Case

Specification:
Standard: ASME B94.11M
Material: HSS-E M35 (5% Cobalt) / HSS M2 / HSS 4341 / HSS 4241
Piece Count: 115 Pieces (60 Number #1–#60 / 26 Letter A–Z / 29 Fractional 1/16″–1/2″)
Shank Type: Straight Shank
Point Angle: 135° Split Point
Manufacturing: Fully Ground
Case: Heavy-Duty Green Powder-Coated Metal Index Box with Latch
Application: Stainless Steel, Alloy Steel, Cast Iron, Structural Steel, Aluminum, Wood, Plastic, etc.

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Description

115-Piece M35 Cobalt Drill Bit Index Set with Heavy-Duty Metal Case – #1–#60, A–Z, 1/16"–1/2"

Engineered for professionals who demand precision, durability, and complete size coverage in one tool. This 115-piece cobalt drill bit index set is built for machinists, maintenance engineers, and industrial buyers who work with hard metals every day and can't afford bits that dull, walk, or fail mid-job.

★ Complete Size Coverage – Every Standard Size, One Set

This index set covers all three industry-standard series in a single case: 60 number sizes (#1 through #60), 26 letter sizes (A through Z), and 29 fractional sizes (1/16" to 1/2" in 1/64" increments). Whether you're drilling tap clearance holes, transfer punching, or sizing for precision fits, every size you need is already here. No substitutions, no compromise — just the right bit, every time.

★ HSS-E M35 Cobalt Steel – Our Primary Grade for Hard Metal Performance

The headline of this set is the material: HSS-E M35, containing 5% cobalt, which significantly elevates heat resistance, hardness, and tool life compared to standard HSS. These bits maintain their cutting edge at temperatures where ordinary bits would soften and fail — making them the professional's choice for:
• Stainless Steel (304, 316, and hardened grades)
• Alloy Steel and Die Steel
• Cast Iron and Structural Steel
• Heat-Resistant and Hard-to-Machine Materials
• Aluminum, Copper, and Non-Ferrous Metals

All M35 bits in this set are fully ground — not rolled or milled — ensuring tight diameter tolerances, superior surface finish, and consistent runout performance across all 115 sizes. The 135° split point delivers self-centering entry and aggressive chip clearance with no center punch required.

Other material grades (HSS M2, HSS 4341, HSS 4241) are available for customers sourcing at different performance and price tiers.

★ Heavy-Duty Powder-Coated Steel Index Case

This set ships in a heavy-gauge powder-coated steel index case built for the shop floor, not the shelf. Each of the 115 slots is individually labeled for instant size identification. The reinforced latch keeps the case securely closed during transport, and the integrated carry handle makes it easy to move between workstations. Available in Green or Black — ideal for color-coding by grade or matching your facility's tool management system.

Unlike plastic cases that crack under shop conditions, this metal index case is designed to be a permanent part of your tool inventory.

★ Manufactured to ASME B94.11M Standard

Every bit in this set is produced to ASME B94.11M specifications, ensuring dimensional accuracy, consistent geometry, and reliable performance across the full 115-piece range. This is a professional-grade index set built for repeated, high-volume use in demanding industrial environments.

★ OEM & Wholesale Available

We supply direct to distributors, industrial buyers, and private label customers. Custom case color, logo, packaging, and mixed-grade configurations are available on request. Contact us for MOQ and pricing.

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