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Lathe Spindle Nose Fittings
American Long Taper
American Standard Type A-1, A-2, B-1, B-2, etc.
American Short Taper with Cam-lock Fitting Type D1

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Backplates and chucks can be supplied in most of these fittings
British and ISO Standard Spindle Noses
German Standard Spindle Noses   Stuck Chuck

American Long Taper with Drive Key and Draw-nut Type L
Widely used on industrial-class lathes from the late 1930s until the 1960s.

The spindle nose is provided with a long but steep taper for centring and locating fittings, a key to provide positive location and a flanged nut for retention.
CLICK HERE FOR A PDF of Spindle Nose Fittings

American long-nose Taper Type L

American Standard Type A-1, A-2, B-1, B-2 etc. Short taper with bolt or stud fixing.
Commonly used on turret lathes, single-spindle automatics and larger industrial-class  ("Engine") lathes.
Type A-1: tapped holes on outer-bolt circle
Co and inner-bolt circle C1.
Type A-2: tapped holes on the outer-bolt circle Co but no holes on inner-bolt circle C1
Type B-1: drilled holes on outer-bolt circle Co and tapped holes on inner-bolt circle C1
Type B-2: drilled holes on outer-bolt circle Co but no holes on inner-bolt circle C1

American Short Taper Standard Type A-1, A-2, B-1, B-2

American Short Taper with Cam-lock Fitting Type D1
A replacement for the original American long-nose taper and widely used on many different sizes of lathe.
The different sizes are referred to as D1-3", D1-4", D1-5", etc. although some publications and parts lists have the figures are reversed as in 3"-D1 or simply list them, as in the cart below, as 3" (3-inch), 4" (4-inch) etc.
The spindle nose is provided with a short tapered flange of the same dimensions as the American A-1 Type but has in its face either 3 or 6 holes (for light and heavy-duty use respectively) into which the mounting studs on the back of a chuck or backplate can fit. Each stud is cut away in a semi-circle half-way along its length and an eccentric cross pin, turned by a standard chuck key, causes these to be drawn inwards until the pin goes over-centre and locks. The pins, being screwed into the back of the chuck, can be turned until the locking action is positive.

American Short Taper with Cam-lock Fitting Type D1

CLICK HERE FOR A PDF of Spindle Nose Fittings