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Clear case holding fifteen silver drill bits in graduated sizes

Cleveland

Cleveland C70370 15PC NAS907 Heavy-Duty Screw Machine Drill Set

SKU CH-484W-N7N3S

15-piece high-speed steel drill set with 135-degree split points covering fractional sizes from 1/16 to 1/2 inch

  • Product colorTransparent
  • 15-piece set covers common fractional sizes
  • 135-degree split point reduces walking on hard materials
  • High-speed steel construction resists heat during extended drilling
  • Bright uncoated finish suits general-purpose metalwork
  • NAS907 Type C specification meets heavy-duty screw-machine requirements

15-piece screw machine drill set

This Cleveland C70370 set contains 15 high-speed steel bits manufactured to NAS907 Type C specifications. The fractional inch sizes range from 1/16 inch to 1/2 inch. Each bit features a 135-degree split point designed for self-centering and reduced thrust. The bright uncoated finish suits general-purpose metal drilling.

Split-point geometry and NAS907 compliance

The 135-degree split point allows the bit to start on contact without a centre punch. This geometry reduces walking on hard surfaces and lowers the feed pressure required. NAS907 Type C classification confirms the bits meet specific dimensional and material standards for screw machine use. The bright finish provides no surface coating to wear away during sharpening.

Check your chuck capacity and material suitability

Verify that your drill chuck accepts up to 1/2 inch shank diameters before ordering. The high-speed steel construction is intended for ferrous and non-ferrous metals; it is not rated for masonry, glass or ceramic. Ensure your application matches fractional inch sizing rather than metric or wire gauge standards.

How it compares

Measured against everything we stock in Ratchets, Sockets & Drive Tools, at today’s prices. Recalculated every night.

Price $73.99
Pricier than about 79% of the 418 comparable items (median $20.99).

Specifications

Product
Brand nameCLEVELAND
Product colorTransparent

Questions about this item

When will the 135-degree split points on these HSS bits need resharpening?

The 135-degree split points stay sharp longer than standard points; resharpen when drilling pressure increases or hole quality drops.

Which bit diameter reaches its wear limit first during prolonged drilling?

The 1/16-inch bit has the thinnest web and smallest flutes, so it dulls and can break before larger sizes under the same workload.

How much heat builds up in the bright uncoated HSS when the set runs all day?

Bright high-speed steel conducts heat quickly; use cutting fluid and peck drilling to keep temperatures low during continuous operation.

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