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Stub Shafts for Encoders: FAQ Topics

FAQ Questions FAQ Topics
General Encoders
Analog Tachogenerators
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Selecting an Encoder
Replacing an Encoder
Encoder Options
Explaining the Technology		 Hollow Shaft vs. Modular Encoders
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Motor Shaft Currents
Stub Shafts for Encoders

 

Stub Shafts for Encoders Back to FAQs
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" Stub Kits: 1"
For drawings of these stub shafts, please contact Help Desk.
Stub Shafts: provide 1 1/8" diameter shaft

^ Back to Top
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

^ Back to Top
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

^ Back to Top
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

^ Back to Top
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

^ Back to Top
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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