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Transparent case holding 21 bright steel drill bits in fractional sizes

Cleveland

Cleveland C70369 21PC NAS907 Type C Heavy-Duty Screw Machine Drill Bit Set

SKU CH-QQMM-0AY9B

A 21-piece NAS907 Type C heavy-duty screw machine drill bit set in high-speed steel with 135-degree split points covering fractional sizes from 1/16 to 3/8 inch

  • ColorTransparent
  • 21-piece set covers a wide range of fractional sizes
  • 135-degree split point starts holes accurately without wandering
  • High-speed steel construction handles heavy-duty drilling tasks
  • Bright uncoated finish suits general-purpose metalwork
  • NAS907 Type C specification meets aerospace-grade standards

21-piece NAS907 drill bit set

This Cleveland C70369 set supplies 21 fractional-inch screw machine drill bits built to the NAS907 Type C specification. The bits are made from high-speed steel with a bright uncoated finish and a 135-degree split point for self-centring starts. They suit maintenance technicians, metal fabricators and workshop professionals who need a complete range of standard sizes in one package.

Split point and uncoated finish

The 135-degree split point reduces walking on hard materials and lets the bit begin cutting immediately without a centre punch. The bright uncoated surface avoids coating build-up in tight holes and makes resharpening straightforward. Together these features speed up repetitive drilling in steel, aluminium and other ferrous or non-ferrous metals.

Check your chuck capacity and material

Verify that your drill chuck can accept the largest bit diameter in the set and that your machine delivers enough torque for the smaller sizes. The bits are designed for screw machine and portable drilling applications in metal; they are not intended for masonry, glass or wood-only tasks. Buyers who need coated bits for high-heat production runs or specialty materials should look elsewhere.

Highlights

  • 21-piece set covers a wide range of fractional sizes
  • 135-degree split point starts holes accurately without wandering
  • High-speed steel construction handles heavy-duty drilling tasks
  • Bright uncoated finish suits general-purpose metalwork
  • NAS907 Type C specification meets aerospace-grade standards

Specifications

BrandCLEVELAND
ColorTransparent

Questions about this item

How often will the 135-degree split points on the 1/16 in through 3/8 in bits need resharpening under normal shop use?

The high-speed steel bits hold their 135-degree split-point geometry longer than carbon steel; expect resharpening only after extended drilling in mild steel or aluminium, and the bright finish makes wear easy to inspect.

What is the first limitation that appears when drilling a long series of holes in 3/8 in steel plate?

Chip evacuation becomes the limiting factor; the split-point design helps start holes cleanly, but deep holes in 3/8 in material will require frequent pecking to clear swarf and prevent overheating.

How much heat builds up in the case and bits during an all-day production run?

The bright uncoated high-speed steel dissipates heat quickly into the workpiece, and the transparent case acts only as storage, so neither the bits nor the case retain significant heat during continuous use.

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