9x20 Lathe Mandrels & Arbors
Last updated on Sunday, March 02, 2014 09:36:46 AM Eastern US Time Zone

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Mandrel Set, Specifications, Using a Mandrel, Expanding Arbors, Tapered Lathe Mandrels

Mandrel Set

Continuous size range from
" to 2" inside diameter (ID). Bottom to top numbered (on the flat) 1 through 8.
There are two parts per mandrel; a tapered arbor & a matched flexible sleeve. The large end has a short,
straight shank allowing it to be mounded into a collet. The flat can be clamped by a
lathe dog when turning
in-between centers. Hardened & precision ground, throughout.

EXPANDING LATHE MANDREL SET SPECIFICATIONS
# ID RANGE (in) SHANK (in) SLEEVE (in) LENGTH (in)
1 ~ 9⁄16 2 5
2 9⁄16 ~ 21⁄32 19⁄32 2 6
3 21⁄32 ~ 21⁄32 2 6
4 ~ ⅞ 3 7
5 ⅞ ~ 1 3 7
6 1 ~ 1 1 4 9
7 1 ~ 1 1 4 9
8 1 ~ 2 1 5 11


#1 through 5 mandrels.


Mandrels #6, 7, & 8 have two sleeves each to enable continuous coverage of their ranges.


End view of the largest, #8 sleeve. The inside taper matches that of the arbor.

Using a Mandrel

An expanding mandrel shown mounted using a collet & a live center. All of them can also be mounted
in-between centers & driven with a lathe dog. Tighten & loosen by tapping on the sleeve with a hard
plastic-faced mallet. This part example has a non-standard 39/64 (0.6054" or 15.377mm) inside diameter.


A 0.12" thick brass disk with a 1" hole.

Expanding Arbors

Eight expanding arbors " to 1". Mount in the lathe, expand with the screw, & then machine to size.

Tapered Lathe Mandrels

Small, tapered lathe mandrels in ⅛" to 15/32" by 1/32" sizes. Held between centers & driven with a dog.
Standard taper of 0.0005″ per inch with the size marked at the larger end where a flat is provided for the dog.
Made of hardened tool steel precision ground to size.

Mandrel Set, Specifications, Using a Mandrel, Expanding Arbors, Tapered Lathe Mandrels

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