Arbor Extensions | McMaster-Carr

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28 Products

Extensions for Hex-Shank Drill Bits

Attach to the shank of a drill bit to extend its reach. Tighten the set screws to secure the drill bit in the extension.

	Shank Size	Overall Lg.	OD	Material	Includes		Each
One-Piece Extensions



	1/4"	1/4"	6"	5/8"	Steel	Hex L-Key	3127A77	00000


	1/4"	1/4"	12"	5/8"	Steel	Hex L-Key	3127A78	0000
	5/16"	5/16"	18"	21/32"	Steel	Hex L-Key	2773A11	00000
	5/16"	5/16"	24"	21/32"	Steel	Hex L-Key	2773A12	00000
	7/16"	7/16"	5 1/2"	3/4"	Steel	Hex L-Key	3188A31	00000
	7/16"	7/16"	12"	3/4"	Steel	Hex L-Key	3188A32	00000
	7/16"	7/16"	18"	7/8"	Steel	Hex L-Key	2773A14	00000
	7/16"	7/16"	24"	13/16"	Steel	Hex L-Key	2773A15	00000

Polisher Arbor Extensions

Add up to 9" between your polisher and pad to reach into deep grooves and other tight spots. Each kit includes a 3" and a 6" extension—use them individually or combine them.

For Arbor Hole Thread Size	Arbor Hole Thread Size	Shank Dia.	Extension Lg.	Material	Max. Rotation Speed, rpm		Each
5/8"-11	5/8"-11	3/4"	3", 6", 9"	Stainless Steel	3,500	8290N101	000000

Hole Saw Arbor Extensions

Reach your hole saw into spots where your drill is too big to fit. These extensions add 12" between your hole saw and your drill.

For Arbor Shank Size	Lg.	Material		Each
3/8"	12"	Steel	6016N11	000000
7/16"	12"	Steel	4066A64	00000

Morse Taper Shank Extensions

Access hard-to-reach places while machining—these extensions add length to drill bits, arbors, and other tools with a Morse taper shank. Also known as drill sockets.

Slide your tool in, then press firmly to seat it. To separate the tool from these extensions, use a Morse taper removal tool.

Steel extensions have a soft body that can be machined and then hardened for wear resistance. The tang is already hardened.

Hardened steel extensions resist wear better than steel extensions.

	Inside Machine Taper No.	Overall Lg.		Each
Steel



	Morse 1	Morse 1	5 5/8"	2977A31	000000


	Morse 2	Morse 2	6 7/8"	2977A32	00000
	Morse 3	Morse 3	8 1/2"	2977A33	00000
	Morse 4	Morse 4	10 1/2"	2977A34	00000
	Morse 5	Morse 5	13 3/4"	2977A35	00000
	Morse 6	Morse 6	18 1/4"	2977A36	000000


	Hardened Steel



			Morse 2	Morse 2	6 13/16"	2977A37	00000


			Morse 2	Morse 2	9 3/16"	2977A38	00000
			Morse 3	Morse 3	8 1/2"	2977A39	00000
			Morse 3	Morse 3	11 1/4"	2977A41	00000
			Morse 3	Morse 3	14"	2977A42	00000
			Morse 4	Morse 4	10 7/16"	2977A43	00000
			Morse 4	Morse 4	16 15/16"	2977A44	000000
			Morse 5	Morse 5	13 1/16"	2977A45	000000
			Morse 5	Morse 5	16 15/16"	2977A46	000000
			Morse 5	Morse 5	20 13/16"	2977A47	000000
			Morse 6	Morse 6	18 3/4"	2977A48	000000