Spindle Type and Size Guide

It’s essential to choose the correct direct mount lathe chuck or chuck adapter plate when upsizing or replacing a lathe chuck on your machine. It can be a challenge to determine your spindle type when you don’t have that information on hand. The easiest way to determine the spindle type and size is to remove the chuck and/or adapter plate from the spindle nose and measure it. Save time by using the guide below to quickly and accurately measure your machine.

Common Machine Spindle Types

D1 Camlock Spindle
DIN 55029, ISO 702/II

A1/A2 Short Taper
DIN 55026, ISO 702/I

L Type Long Taper Key Drive

D1 Camlock Spindle, DIN 55029, ISO 702/II

Determining D1 Type Spindle and Size

Measure the pilot diameter and length (B & C)
Measure the bolt circle diameter (F)
Measure the diameter of the holes (E)

D Spindle Type Dimensional Specifications Technical Drawing

Spindle Nose	A (in)	F (in)	B (in)	C max (in)	E (in)	Number of Holes	Camlock Stud Dia (in)
D1-3	3.622	2.7820	2.1250 + .00025	.4375	.5937	3	9/16
D1-4	4.606	3.2500	2.5005 + .0005	.4375	.6562	3	5/8
D1-5	5.748	4.1250	3.2505 + .0005	.5000	.8750	6	3/4
D1-6	7.126	5.2500	4.1880 + .0005	.5625	1.000		7/8
D1-8	8.858	6.7500	5.50075 +.0005	.6250	1.125		1
D1-11	11.732	9.2520	7.75075 +.0005	.6875	1.250		1 3/16
D1-15	15.866	13.0000	11.251 + .001	.7500	1.375		1 3/8

D1-3 camlock stud. Each stud has a “D“ shaped cutout TMX Part Number 3-899-103P

TMX D1-6 direct mount self-centering scroll chuck TMX Part Number 3-823-0836

A1/A2 Short Taper, DIN 55026, ISO 702/I

Determining an A Type Spindle and Size

Measure the pilot diameter and length (B & C)
Measure the bolt circle diameter (F1 and F2) and diameter of the holes (E1 & E2)
Check the number of bolt circles (one for A2 mount or two for A1 mount)
All chucks with A1 mount can be installed on A1 spindle nose only
All chucks with A2 mount can be installed on either a A2 or A1 spindle.

Spindle Nose	F1 (in)	F2 (in)	B (in)	C max (in)	Thread E1 = E2 UNC-3B
A-4	3.2500	-	2.5005 + .0005	.4375	7/16-14
A-5	4.1250	2.4374	3.2505 +.0005	.5625	7/16-14
A-6	5.2500	3.2500	4.1880 + .0005	.6250	1/2-13
A-8	6.7500	4.37500	5.50075 + .0005	.6875	5/8-11
A-11	9.2500	6.5000	7.75075 + .0005	.7500	3/4-10
A-15	13.0000	9.7500	11.251 + .001	.8125	7/8-9
A-20	18.2500	14.5000	16.251 +.001	.8750	1-8
A-28	25.5000	20.8750	23.001 + .001	1.000	1 1/4-7

TMX A2-8 fully finished adapter plate for a Set-Tru TMX Part Number 3-874-108P

TMX A2-11 direct mount independent manual lathe chuck TMX Part Number 3-856-1619P

L Type Long Taper Key Drive

Determining an L Type Spindle and Size

Measure pilot diameter (A)
Measure length (C)
Measure thread size (dimension B)

L Spindle Type Dimensional Specifications Technical Drawing

Spindle Nose	Thread B	C (in)	A (in)	Key
L00	3 3/4" - 6"	2	2.750	3/8 x 3/8 x 1 1/2
L0	4 1/2" - 6"	2 3/8	3.250	3/8 x 3/8 x 1 3/4
L1	6" - 6"	2 7/8	4.125	5/8 x 5/8 x 2 3/8
L2	7 3/4" - 5"	3 3/8	5.250	3/4 x 3/4 x 2 7/8
L3	10 3/8" - 4"	3 7/8	6.500	1 x 1 x 3 1/4