Stub Shafts for Encoders

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Stub Shafts for Encoders

A selection of stub shafts for encoders.

Many applications require the extension of existing motor or line shafts to permit encoder mounting or coupling. The key to successful stub shafts is good centering. This gives straight, true shaft alignment with minimal run-out (TIR).

Avtron stub shafts do not typically use the thread-in portion of the connection to provide centering. Instead, our stub shafts typically grasp the outer diameter of the existing shaft. Alternatively, many Avtron stub shafts designed to fit GE DC motors use a pilot to fit a machined, recessed (rabbeted) area in the end of the shaft. Both of these types of stub shafts may use bolts or set screws to hold them in place, but the fastener is not used to center the shaft. Avtron has many stub shafts for common motor models and line shafts.

Stub Shafts: 1 1/8"

Stub Shafts: 1"

Stub Shafts: 5/8"

Stub Shafts: 1/2"

For drawings of these stub shafts, please contact Help Desk.

Stub Shafts: provide 1 1/8" diameter shaft

Motor Mfr

Motor or Shaft Mount

Length (inches) [mm]

Part #

Overall

Useable

In

[mm]

In

[mm]

ABB

DC HXR 315 motor

6.69

[170]

4.50

[114]

B23573-1

ABB

DC HXR 355 motor

7.19

[183]

4.50

[114]

B23573-2

ABB

DC HXR 400 motor

7.30

[185]

4.50

[114]

B23574-1

ABB

DC HXR 450 motor

8.80

[224]

4.50

[114]

B23574-2

ABB

DMP112 small frame DC motor

4.72

[120]

4.25

[108]

B24941

ABB

LAB280 Motor

6.87

[174]

4.62

[117]

B27203

ABB

Large DC motors

4.96

[151]

4.50

[114]

B22916

Any

1.125" over shaft fit*

5.00

[127]

4.50

[114]

B25601-3

Any

1.375" over shaft fit*

5.00

[127]

4.44

[113]

B27204

Any

1.375" over shaft fit** (Fits over a 2" shaft extension)

11.00

[279]

8.38

[213]

B27951

Any

1.625" over shaft fit*

5.18

[132]

4.50

[114]

B25601-1

Any

1.875" over shaft fit*

5.00

[127]

4.44

[113]

B29468

Any

2.125" over shaft fit*

5.18

[132]

4.50

[114]

B25601-2

Any

2.875" over shaft fit** (Fits over a 2.5" shaft extension)

7.38

[187]

4.50

[114]

B26875

GE

180 - 329 Frame AC type KAF

7.70

[196]

7.32

[186]

B28514

GE

320 - 500 Frame AC type X$D motors*

7.70

[196]

7.32

[186]

B28514

GE

CD1558, 1586 Frame DC motors

6.28

[160]

4.50

[114]

B22915

GE

CD180AT - 360AT Frame DC motors*

7.70

[196]

7.32

[186]

B28514

GE

CD365AT, 366AT, 368AT Frame DC Motors***

11.94

[303]

10.50

[267]

B29374

GE

CD365AT, 366AT, 368AT Frame DC Motors***

5.18

[132]

4.75

[121]

B25633-2

GE

CD365AT, 366AT, 368AT Frame DC Motors***

6.50

[165]

5.25

[133]

B28790-6

GE

CD4000 - 9999 Frame DC motor***

10.69

[272]

10.26

[261]

B25631-6

GE

CD4000 - 9999 Frame DC motor***

11.43

[290]

11.00

[279]

B25631-3

GE

CD4000 - 9999 Frame DC motor***

13.43

[341]

13.00

[330]

B25631-4

GE

CD4000 - 9999 Frame DC motor***

14.43

[367]

14.00

[356]

B25631-5

GE

CD4000 - 9999 Frame DC motor***

5.18

[132]

4.75

[121]

B25631-1

GE

CD4000 - 9999 Frame DC motor***

5.31

[135]

5.00

[127]

B24240

GE

CD4000 - 9999 Frame DC motor***

7.68

[195]

7.25

[184]

B25631-7

GE

CD4000 - 9999 Frame DC motor***

9.43

[240]

9.00

[229]

B25631-2

GE

CD4000 - 9999 Frame DC motor***

6.43

[163]

6.00

[152]

B25631-8

GE

CD400AT - 409AT Frame DC Motor***

5.00

[127]

5.00

[128]

B29708

GE

CD400AT - 409AT Frame DC Motor***

6.50

[165]

5.25

[133]

B28790-4

GE

CD405 Frame DC Motor***

6.50

[165]

5.25

[133]

B28790-5

GE

CD406A,505AS,506AS,634AS Frame DC motors***

5.68

[144]

4.50

[114]

B22914

GE

CD445AY, CD505A Frame DC Motors***

3.18

[81]

2.75

[70]

B27750

GE

CD500AT, 506AT, 508AT Frame DC Motors***

3.31

[84]

2.68

[68]

B26858

GE

CD500AT, 506AT, 508AT Frame DC Motors***

5.18

[132]

4.75

[121]

B25633-1

GE

CD500AT, 506AT, 508AT Frame DC Motors***

6.50

[165]

5.25

[133]

B28790-3

GE

CD504E Frame DC Motor***

5.18

[132]

4.75

[121]

B25633-3

GE

CD506 Frame DC Motor***

12.00

[305]

8.50

[216]

B25633-4

GE

CD580 Frame DC motor***

6.50

[165]

5.25

[133]

B28790-2

GE

CD6000 - 6999 Frame DC Motor***

3.18

[81]

2.25

[57]

B27748-2

GE

CD6000 - 6999 Frame DC Motor***

7.93

[201]

2.25

[57]

B27748-1

GE

CD6000 - 6999 Frame DC Motor***

9.18

[233]

2.25

[57]

B27748-3

GE

CD680 Frame DC motor***

6.50

[165]

5.25

[133]

B28790-1

GE

CD683AY Frame DC Motor***

3.37

[86]

2.75

[70]

B27749

GE

CD685AY Frame DC motor***

11.68

[296]

2.25

[57]

B27747-1

GE

CD685AY Frame DC motor***

7.18

[182]

2.25

[57]

B27747-2

GE

CDL409ATY Frame DC motor***

10.50

[267]

5.00

[128]

B29622

GE

MD 606/806 Frame mill motors, w/ground brush extension

8.13

[207]

5.25

[133]

B25606-1

GE

MD602/802 Frame DC mill motor****

6.25

[159]

4.38

[111]

B29582

GE

MD618/818 Frame DC mill motor****

15.30

[388]

4.62

[117]

B28425

GE

MD603/803 Frame DC mill motor****

5.05

[128]

3.42

[87]

B27963

GE

MD604/804 Frame DC mill motor****

6.38

[162]

4.88

[124]

B27317

GE

MD606/806 Frame DC mill motors

6.38

[162]

4.88

[124]

B26456

GE

MD608/808 Frame DC mill motors

6.38

[162]

4.88

[124]

B26399

GE

MD608/808 Frame DC mill Motor**** (M685, no drum)

5.66

[144]

2.55

[65]

B27964

GE

MD608/808 Frame DC mill Motor****, (M4, no drum)

7.50

[191]

2.55

[65]

B27256

GE

MD612/812 Frame DC mill motor****, (M4, no drum)

9.50

[241]

5.13

[130]

B27624

GE

MD612/812 Frame DC Motor****

11.50

[292]

5.13

[130]

B27223

GE

MD612/812 Frame DC Motor****

9.50

[241]

5.13

[130]

B26021

GE

MD614/814 Frame DC mill motor****

11.50

[292]

4.62

[117]

B27623

GE

PMD812 Frame DC mill motor****

8.00

[203]

4.62

[117]

B27925

GE

PMD814 Frame DC mill motor****

8.25

[210]

4.62

[117]

B27924

Reliance

Various, 0.625" ID motor shaft pilot, incl. shaft gnd. Stub

5.56

[141]

5.25

[133]

B29295

Siemens

1000 HP Motor 130mm OD w/90mm M10 (3) bolt circle

6.38

[162]

5.76

[146]

B27259

For drawings of these stub shafts, please contact Help Desk.

Stub Shafts: provide 1" diameter shaft

Motor Mfr

Motor or Shaft Mount

Length (inches) [mm]

Part #

Overall

Useable

In

[mm]

In

[mm]

Any

1.000" over shaft fit*

7.25

[184]

2.25

[57]

B27193

GE

A$D 182 - 320 Frame AC Motors

2.63

[67]

2.25

[57]

B26623

GE

A$D 404 - 5013 Frame AC Motors

3.02

[77]

2.25

[57]

B26624

GE

A$D 404 - 5013 Frame AC Motors

6.77

[172]

6.00

[152]

A25052-16

GE

A$D 580 - 8511 Frame AC Motors w/FC Flange

7.50

[191]

6.75

[171]

A25052-15

GE

A$D AC Fan Cooled Motors w/o FC Flange

4.12

[105]

3.75

[95]

A25052-7

GE

CD/CDL 180 - 320AT Frame DC Motors***

2.63

[67]

2.25

[57]

B26623

GE

CD/CDL 180 - 320AT Frame DC Motors***

3.44

[87]

2.90

[74]

B28392

GE

CD/CDL 360 - 369AT Frame DC Motor***

3.02

[77]

2.25

[57]

B26626

GE

CD/CDL 400 - 409AT Frame DC Motor***

3.02

[77]

2.25

[57]

B26624

GE

CD/CDL 400 - 409AT Frame DC Motor***

6.77

[172]

6.00

[152]

A25052-16

GE

CD4300 - 4399 Frame DC Motors***

7.50

[191]

6.75

[171]

A25052-14

GE

CD4300 - 4399 Frame DC Motor***

3.00

[76]

2.25

[57]

A25052-1

GE

CD444 DC Motor***

8.75

[222]

8.00

[203]

A25052-17

GE

CD4500 Frame DC Motor***

5.31

[135]

5.00

[127]

C25429

GE

CD/CDL 504AT, 506AT, 508AT Frame DC Motors***

7.50

[191]

6.75

[171]

A25052-15

GE

CD5010 - 5019 Frame DC Motor***

7.50

[191]

6.75

[171]

A25052-15

GE

CD6000 - 6999 Frame DC Motor***

3.00

[76]

2.25

[57]

A25052-1

GE

CD6000 - 6999 Frame DC motors***

7.50

[191]

6.75

[171]

A25052-14

GE

X$D Ultra 140 - 189 Frame AC Motors

2.67

[68]

2.67

[68]

A25052-12

GE

X$D Ultra 210 - 289 Frame Motors

2.67

[68]

2.67

[68]

A25052-13

GE

X$D Ultra 320 - 449 Frame AC Motors

3.44

[87]

2.90

[74]

A25052-11

Siemens

MD Mill Duty Motor

3.21

[82]

2.90

[74]

B29065

For drawings of these stub shafts, please contact Help Desk.

Stub Kits: provide 1" diameter shaft & M3/M4 mounting hardware

Motor Mfr

Motor or Shaft Mount

Length (inches) [mm]

Part #

Overall

Useable

In

[mm]

In

[mm]

GE

A$D 180 - 329 Frame AC Motors w/FC Flange***

2.63

[67]

2.25

[57]

A25052-2

GE

A$D 404 - 5013 Frame AC Motors w/FC Flange***

3.00

[76]

2.25

[57]

A25052-3

GE

A$D 580 - 8511 Frame AC Motors w/FC Flange***

3.00

[76]

2.25

[57]

A25052-4

GE

CD/CDL 400 - 409AT Frame DC Motor***

3.00

[76]

2.25

[57]

A25052-3

GE

CD/CDL 504AT, 506AT, 508AT Frame DC Motors***

3.00

[76]

2.25

[57]

A25052-4

GE

CD180 - 320AT Frame DC Motors***

2.63

[67]

2.25

[57]

A25052-2

GE

CD360 - 369AT Frame DC Motor***

3.00

[76]

2.25

[57]

A25052-5

GE

CD4300 - 4399 Frame DC Motor***

3.00

[76]

2.25

[57]

A25052-1

GE

CD5010 - 5019 Frame DC Motor***

3.00

[76]

2.25

[57]

A25052-4

GE

CD6000 - 6999 Frame DC Motor***

3.00

[76]

2.25

[57]

A25052-1

GE

X$D Ultra 320 - 449 Frame AC Motors

3.44

[87]

2.90

[74]

A25052-6

For drawings of these stub shafts, please contact Help Desk.

Stub Shafts: provide 5/8" diameter shaft

Motor Mfr

Motor or Shaft Mount

Length (inches) [mm]

Part #

Overall

Useable

In

[mm]

In

[mm]

GE

CD180 - 320AT Frame DC Motors***

1.25

[32]

0.94

[24]

B26628

GE

CD180 - 320AT Frame DC Motors***

1.45

[37]

1.14

[29]

B27352

GE

CD180 - 320AT Frame DC Motors***

2.50

[64]

2.25

[57]

B27351

GE

CD180 - 320AT Frame DC Motors***

4.28

[109]

2.00

[51]

B28876

GE

A$D 180 - 329 Frame AC Motors w/FC Flange***

1.25

[32]

0.94

[24]

B26628

GE

A$D 180 - 329 Frame AC Motors w/FC Flange***

1.45

[37]

1.14

[29]

B27352

GE

A$D 180 - 329 Frame AC Motors w/FC Flange***

2.50

[64]

2.25

[57]

B27351

GE

A$D 180 - 329 Frame AC Motors w/FC Flange***

4.28

[109]

2.00

[51]

B28876

GE

CD360 - 369AT Frame DC Motor***

3.22

[82]

2.19

[56]

B28877-1

GE

CD5000 - 6000 Frame DC Motors***

2.44

[62]

2.19

[56]

B28880

GE

CD500 - 509AT Frame DC Motor***

3.22

[82]

2.19

[56]

B28877-2

GE

A$D 580 - 8511 Frame AC Motors w/FC Flange***

3.22

[82]

2.19

[56]

B28877-2

GE

CD685 Frame DC motor***

2.44

[62]

2.19

[56]

B28879

GE

MD812 Frame DC mill motor****

5.75

[146]

3.00

[76]

B28317

For drawings of these stub shafts, please contact Help Desk.

Stub Shafts: provide 1/2" diameter shaft

Motor Mfr

Motor or Shaft Mount

Length (inches) [mm]

Part #

Overall

Useable

In

[mm]

In

[mm]

GE

CD6000 - 6999 Frame DC Motor***

1.77

[45]

1.00

[25]

B26627

GE

CD360 - 369AT Frame DC Motor***

1.77

[45]

1.00

[25]

B26631

GE

CD400 - 409AT Frame DC Motor***

1.77

[45]

1.00

[25]

B26629

GE

CD504, 505, 506, 5101 Frame DC Motor***

1.77

[45]

1.00

[25]

B26630

* Requires 3/8"-16 tapped hole in end of shaft or a thread reducer bushing to accept a 3/8"-16 thread.
** Uses set screws; no tapped hole required.
*** End Shaft Mounted using motor shaft face details.
**** Threaded over end of motor shaft using OEM lock ring, length determined by brake drum depth.

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