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Aircraft Extension HSS Bits
6" aircraft extension drill bits
12" aircraft extension drill bits
6" and 12" Lengths
Aircraft Extension Bits - 135° Split Point
Black - USA
12" thru 60" Lengths
Ridgbor Aircraft Ext. Bits -135° & 118°
Silver - USA


Aircraft Extension Bits are made of the same steel used in bits manufactured for production cutting of tough metals.
These bits are especially suitable for drilling through both metal and wood (including nail embedded wood).

The AIRCRAFT EXTENSION are black in color, manufactured with a 135° Split Ponit and are the same diameter the entire shaft (these are basically just like our Heavy Duty High Speed Jobber Series Bits just extended to 6" or 12" Lengths).

The RIDGBOR AIRCRAFT EXT. BITS are an exclusive bit that has been a favorite amongst experienced journeyman for over 3 decades. The STRAIGHT SHAFT SERIES are polished silver in color, have a 135° Split Point, and are the same diameter the full length up to 60". The REDUCED SHAFT SERIES are made with a slightly deeper angle (118° standard point) and also undergo a secondary machining process which makes this bit unlike any other bit on the market. Before being extended, the HSS bit is machined down, all the way into the bottom of the flute allowing 100% chip clearance and smooth, non-binding penetration.

NOTE: The AIRCRAFT EXT. BITS and RIDGBOR EXT. BITS are made by two different
USA manufacturers for the Service Warehouse.



Freight Paid by the Service Warehouse $100.00 Minimum Order

6" Aircraft Extension Bits Heavy duty high speed bits that have been extended to various specified lengths. They are commonly used when jobber length is simply not long enough.

M1-Ridgbor° Extension Bits These bits will cut through Metal lath, Nails, Knots, and "Hard Woods" easily. Most bell hangers are made of carbon tool steel, suitable for wood only. The Ridgbor is made of the same M-1 steel used in bits manufactured for production cutting of tough metals. The unique difference between the reduced series M-1 Ridgbor° and other HSS extension bits is the secondary machining process. The 3/8" M-1 Ridgbor is machine lathed down to 5/16", all the way into the bottom of the flute allowing 100% chip clearance and smooth, non-binding penetration. Especially suitable for drilling in nail embedded wood, the Ridgbor does not have a wire pull hole.

NOTE: The 1/4" reduced shaft Ridgbors are machine lathed to 15/64". The 3/8" Ridgbors are lathed to 5/16" and the 1/2" Ridgbors are lathed to 3/8". For the 3/4", these particular Ridgbors are reduced to 1/2" Shaft, not lathed.

Toll-Free (800) 822-6004
310 329-9110
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Email: Sales@TheServiceWarehouse.com