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Chicago-Latrobe 51/64 inch drill bit black oxide finish 1/2 reduced shank 118 degree point

Chicago-Latrobe

Chicago-Latrobe 55451 51/64 in 118 Degree Drill Bit 1/2 Reduced Shank

SKU CH-TR9J-6TT99

A 51/64 inch high-speed steel drill bit with a 118-degree point and 1/2 inch reduced shank for large-hole drilling

  • Product typeDrill Bits
  • 51/64 in diameter bores large holes
  • 118-degree point angle centres quickly
  • Black oxide finish resists wear
  • High-speed steel cuts tough materials
  • 1/2 in reduced shank fits standard chucks

Chicago-Latrobe 55451 Drill Bit

The Chicago-Latrobe 55451 is a reduced-shank drill bit sized at 51/64 in with a 118-degree point angle. It is made from high-speed steel and finished with black oxide for durability. The 1/2 in reduced shank allows use in chucks that cannot accept a full-size shank. This accessory targets machinists and maintenance technicians who need a large-diameter hole in metal.

Suits machinists needing a single large hole

This bit suits users drilling a 51/64 in hole in steel or similar materials where a 118-degree point is appropriate. The reduced shank fits standard 1/2 in chucks on pillar drills or heavy hand drills. Buyers who need a set of multiple sizes or a different point angle for specialised alloys should look at something else. The product is sold individually without a case or organiser.

51/64 in drill bit size decides fit

The decisive specification is the 51/64 in drill bit size, which must match the required hole diameter exactly. The 118-degree point angle and high-speed steel material support general-purpose metal drilling. The black oxide finish helps resist wear and corrosion during use. Verify the shank diameter matches the chuck capacity before purchase.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $27.99
Typical for this category: the median of 5,493 items is $27.99.

Specifications

Product
Brand nameCHICAGO-LATROBE
Product typeDrill Bits

Questions about this item

How do I install the 51/64 in drill bit in a 1/2 in chuck without it slipping?

Insert the reduced shank fully into the chuck and tighten all three jaws evenly on the shank flats, not on the flutes, to prevent the bit from walking under load.

When will the 118 degree point on the high speed steel bit need resharpening?

Resharpen when the cutting lips show visible rounding or when drilling pressure increases noticeably; a bench grinder or drill doctor can restore the 118 degree angle on the black oxide finish.

What limits continuous drilling with the 55451 bit in thick steel?

Heat buildup at the 118 degree point is the first limit; use cutting fluid and pause to let the high speed steel cool, otherwise the temper can soften and the edge will dull rapidly.

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