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Lathe Spindle Nose Mounting Systems
Index      
14 pt DotType D1 - Camlock 14 pt DotType L - Long Taper 14 pt DotTypes A & B - Short Taper 14 pt DotThreaded

American Standard Type D1 - Camlock

The Type D1 Camlock mounting is used on lots of Engine Lathe spindles.
Each pin on the chuck side has a "D" shape cutout.
When mounting, you use your chuck key to rotate a cam in the spindle side that pulls the pin in snug.
For mounting suggestions see page 2 of Jacobs Spindle Nose Lathe Chuck Manual

Type D - Camlock picture Type D - Camlock drawing Type D - Camlock picture

Most of this data is from VICTOR MACHINERY EXCHANGE website

Spindle

A

B

C

D

E

F

G

H

# Pins

D1-3

3-5/8

2.1250

7/16

1.391

0.5937

?

7° 7' 30"

9/16"

3

D1-4

4-5/8

2.5005

7/16

1.625

0.6562

?

7° 7' 30"

5/8"

3

D1-5

5-3/4

3.2505

1/2

2.0625

0.78125

?

7° 7' 30"

3/4"

6

D1-6

7-1/8

4.1880

9/16

2.625

0.90625

1.7 *

7° 7' 30"

7/8"

6 **

D1-8

8-7/8

5.50075

5/8

3.375

1.03125

2 *

7° 7' 30"

1"

6

D1-11

11-3/4

7.75075

11/16

4.625

1.21875

?

7° 7' 30"

1-3/16" ?

6

D1-15

15-7/8

11.2510

3/4

6.500

1.40625

?

7° 7' 30"

1-3/8" ?

6

*

 Approx. values

**

 Every D1-6 mount Jacobs Spindle Nose Lathe Chuck, I've seen, had only 3 pins.

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American Standard Type L - Long Taper

Widely used on industrial-class lathes from the late 1930s until the 1960s.
The spindle nose has taper for centring and locating fittings, a key for positive drive and a flanged retention nut.
For mounting suggestions see pages 2 and 3 of Jacobs Spindle Nose Lathe Chuck Manual

Type L - Long Taper picture Type L - Long Taper drawing Type L - Long Taper picture

Most of this data is from
VICTOR MACHINERY EXCHANGE website

Spindle

A

B

C

D

Key Width

L00

2.750

3-3/4 - 6

2

8° 17' 50"

3/8

L0

3.250

4-1/2 - 6

2-3/8

8° 17' 50"

3/8

L1

4.125

6 - 6

2-7/8

8° 17' 50"

5/8

L2

5.250

7-3/4 - 5

3-3/8

8° 17' 50"

3/4

L3

6.500

10-3/8 - 4

3-7/8

8° 17' 50"

1"


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American Standard Type Ax & Bx - Short Taper

Commonly used on turret lathes, single-spindle automatics and larger industrial-class ("Engine") lathes.
Type A1: tapped holes on outer-bolt circle and inner-bolt circle.
Type A2: tapped holes on outer-bolt circle, no holes on inner-bolt circle.
Type B1: drilled holes on outer-bolt circle, tapped holes on inner-bolt circle.
Type B2: drilled holes on outer-bolt circle, no holes on inner-bolt circle.
For mounting suggestions see page 3 of Jacobs Spindle Nose Lathe Chuck Manual

Type A - Short Taper picture Type A - Short Taper drawing Type A - Short Taper picture

Most of this data is from www.lathes.co.uk website

Spindle

A

B

C

D

E

F
+0.002

G

H

J

A1-3

3.625

2.1250

~

~

1.391

~

7/16-14

7/16-14

~

A2-3

3.625

2.1250

0.44

~

1.391

~

~

7/16-14

7° 7' 30"

B1-3

3.625

2.1250

~

~

1.391

~

7/16-14

0.469

~

B2-3

3.625

2.1250

0.44

~

1.391

~

~

0.469

7° 7' 30"

A1-4

4.250

2.5005

~

~

1.625

0.562

7/16-14

7/16-14

~

A2-4

4.250

2.5005

0.44

~

1.625

0.562

~

7/16-14

7° 7' 30"

B1-4

4.250

2.5005

~

~

1.625

0.562

7/16-14

0.469

~

B2-4

4.250

2.5005

0.44

~

1.625

0.562

~

0.469

7° 7' 30"

A1-5

5.250

3.2505

0.56

1.219

2.063

0.625

7/16-14

7/16-14

7° 7' 30"

A2-5

5.250

3.2505

0.50

~

2.063

0.625

~

7/16-14

7° 7' 30"

B1-5

5.250

3.2505

0.56

1.219

2.063

0.625

7/16-14

0.469

7° 7' 30"

B2-5

5.250

3.2505

0.50

~

2.063

0.625

~

0.469

7° 7' 30"

A1-6

6.500

4.1880

0.63

1.625

2.625

0.750

1/2-13

1/2-13

7° 7' 30"

A2-6

6.500

4.1880

0.56

~

2.625

0.750

~

1/2-13

7° 7' 30"

B1-6

6.500

4.1880

0.63

1.625

2.625

0.750

1/2-13

0.531

7° 7' 30"

B2-6

6.500

4.1880

0.56

~

2.625

0.750

~

0.531

7° 7' 30"

A1-8

8.250

5.50075

0.69

2.188

3.375

0.937

5/8-11

5/8-11

7° 7' 30"

A2-8

8.250

5.50075

0.63

~

3.375

0.937

~

5/8-11

7° 7' 30"

B1-8

8.250

5.50075

0.69

2.188

3.375

0.937

5/8-11

0.656

7° 7' 30"

B2-8

8.250

5.50075

0.63

~

3.375

0.937

~

0.656

7° 7' 30"

A1-11

11.00

7.75075

0.75

3.250

4.625

1.125

3/4-10

3/4-10

7° 7' 30"

A2-11

11.00

7.75075

0.69

~

4.625

1.125

~

3/4-10

7° 7' 30"

B1-11

11.00

7.75075

0.75

3.250

4.625

1.125

3/4-10

0.797

7° 7' 30"

B2-11

11.00

7.75075

0.69

~

4.625

1.125

~

0.797

7° 7' 30"

A1-15

15.00

11.2510

0.81

4.875

6.500

1.375

7/8-9

7/8-9

7° 7' 30"

A2-15

15.00

11.2510

0.75

~

6.500

1.375

~

7/8-9

7° 7' 30"

B1-15

15.00

11.2510

0.81

4.875

6.500

1.375

7/8-9

0.922

7° 7' 30"

B2-15

15.00

11.2510

0.75

~

6.500

1.375

~

0.922

7° 7' 30"

A1-20

20.50

16.251

0.875

7.250

9.125

1.625

?

?

7° 7' 30"

A2-20

20.50

16.251

?

~

9.125

1.625

~

?

7° 7' 30"

B1-20

20.50

16.251

0.875

7.250

9.125

1.625

?

?

7° 7' 30"

B2-20

20.50

16.251

?

~

9.125

1.625

~

?

7° 7' 30"


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Threaded Spindle Mount

For mounting suggestions see page 3 of Jacobs Spindle Nose Lathe Chuck Manual

Threaded Spindle picture Threaded Spindle drawing Threaded Spindle picture

Thread
Dia.

TPI

B

C

D

E

F

G

H

1"

8

?

?

?

?

?

?

?

1-1/2"

8

?

?

?

?

?

?

?

1-3/4"

8

?

?

?

?

?

?

?

2-1/4"

8

?

?

?

?

?

?

?

2-3/8"

6

?

?

?

?

?

?

?

2-3/4"

8

?

?

?

?

?

?

?


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Note: The specifications and information provided on this page are intended for part identification purposes only.
Although we believe them to be correct, dimensions should not be used for part construction or inspection.

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