Micron TRUE Planetary® Gearheads
NemaTRUE™

True Planetary Gearheads
Ready for Immediate Delivery
Precision

13 arc-minutes

Frame Sizes

17, 23/60 mm, 34/90 mm and 42/115 mm

Torque Capacity

up to 180 Nm

Ratio Availability

3:1 thru 100:1

Radial load capacity

up to 3730 N

Mounting System

RediMount™

1

Sealed deep groove ball bearings
provide high radial load carrying capability

2

HRC 55-60 steel gears
provide superior wear resistanceand increased backlash integrity

3 Sealed deep groove ball bearing

provides precision alignment of sun gear

4

RediMount systemprovides error-free motor installation

41
35 Anodized aluminum housing

reduces weight and prevents corrosion

245

MicronTrue Planetary
Planetary®™Gearheads
Gearheads
Micron True
shipped within
within 24
24 hours!
hours!

Gearhead Express™
Need it fast? Go to the back coverof the catalog for details.

28

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P-8741-BG

10/19

Micron TRUE Planetary® Gearheads
NemaTRUE™

EnglishTrue Planetary Gearheads
4X ø .125 (3.18) THRU HOLES
4 PL. EQUALLY SPACED ON A
1.725 (43.82) BOLT CIRCLE
ø .866 (22.00)
ø .865 (21.97)

1.00(25.4)

L.19(4.8)

ø .2500 (6.350)
ø .2495 (6.337).062(1.57)

1.65 SQ.
(42)

.15
(3.8)

Ratio1
3:1 to 10:1
15:1 to 100:1

Dimension ‘L’ Backlashin. [mm][arc-min]2.28 [58]2.77 [71]13 max
15 max

WeightEfficiency.75 [0,34].95 [0,43]

93%
88%

lb. [kg]

Dimensions are inch (mm)Efficiency is calculated at 100% of the rated torque.
Total length may change depending on motor being used.

Performance Specifications
PartNumber

Ratio

1Tr(1000 rpm)
in.-lb. [Nm]NT17-003NT17-005
NT17-010
NT17-015
NT17-025
NT17-030
NT17-050
NT17-100

3:1
5:1
10:1
15:1
25:1
30:1
50:1
100:1

41 [4,7]
44 [5,0]30 [3,4]
47 [5,3]
78 [8,8]
57 [6,4]
91 [10,3]40 [4,5]20000 Hour Life
Tr
Tr
(2000 rpm)
(3000 rpm)
in.-lb. [Nm]in.-lb. [Nm]34 [3,8]37 [4,2]
28 [3,1]
47 [5,3]
58 [6,6]
52 [5,9]78 [8,8]38 [4,3]

29 [3,3]
33 [3,7]25 [2,8]47 [5,3]
53 [6,0]48 [5,4]
65 [7,4]35 [4,0]

1 Ratios are exact, higher ratios and other custom options are alsoavailable, consult factory.
Tr = Rated output torque at rated speed for specific hours of life.

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10/19

JTr
(4000 rpm)

in.-lb. [Nm]in.-lb.-sec x10[kg-cm2]

27 [3,1]
30 [3,4]23 [2,6]42 [4,7]
48 [5,5]46 [5,2]
60 [6,7]33 [3,8]

170 [19,2]
170 [19,2]
170 [19,2]
170 [19,2]
170 [19,2]
170 [19,2]
170 [19,2]
170 [19,2]

0.115 [0,013]
0.040 [0,005]
0.030 [0,003]
0.037 [0,004]0.037 [0,004]
0.026 [0,003]
0.026 [0,003]
0.026 [0,003]

Tpeak

in.-lb. [Nm]2-4

Torsional
Stiffness

in.-lb./arc-min[Nm/arc-min]2.36 [0,268]
2.36 [0,268]
2.36 [0,268]
2.36 [0,268]
2.36 [0,268]
2.36 [0,268]
2.36 [0,268]
2.36 [0,268]

Tpeak = Allowable momentary peak torque for emergency stop or heavy shock loading.
J = Mass moment of inertia reflected to the input shaft (including pinion assembly).

www.bostongear.com

29

Micron TRUE Planetary® Gearheads
NemaTRUE™ Size 23/60

EnglishTrue Planetary Gearheads
English - Dimensions are in. (mm)Metric - Dimensions are mm (in)Ratio1
3:1 to 10:1
15:1 to 100:1

NT23
NT60
Dimension ‘L‘ Dimension ‘L’in. [mm]in. [mm]

1.92 [48,8]
2.61 [66,3]

2.07 [52,6]
2.76 [70,1]

Backlash[arc-min]

Precision
13 max
15 maxHigh Precision
8 max
9 max

WeightEfficiency

1.5 [0,7]
1.9 [0,9]93%88%lb. [kg]

AD** = Adapter length
Adapter length will vary depending onmotor.
Efficiency is calculated at 100% of therated torque.

Performance Specifications
Part Number
EnglishMetric20000 Hour Life
Ratio1

Tr(1000 rpm)

Tr(2000 rpm)

Tr(3000 rpm)

Tr(4000 rpm)

in.-lb. [Nm]98 [11,1]
107 [12,1]
105 [11,9]100 [11,3]
163 [7,1]
124 [14,0]
180 [20,3]
175 [9,8]207 [23,4]
207 [23,4]
202 [22,8]
197 [22,3]
85 [9,6]80 [9,0]90 [10,2]
88 [9,9]83 [9,4]
58 [6,6]
110 [12,4]147 [16,6]
142 [16,0]182 [20,6]
182 [20,6]
175 [19,8]
172 [19,4]
79 [8,9]70 [7,9]80 [9,0]78 [8,8]74 [8,4]
54 [6,1]
105 [11,9]130 [14,7]
125 [14,1]
157 [17,7]
157 [17,7]
152 [17,2]
147 [16,6]
74 [8,9]65 [7,3]
73 [8,2]
71 [8,0]66 [7,5]52 [5,9]100 [11,3]
120 [13,6]
115 [13,0]147 [16,6]
147 [16,6]
142 [16,0]137 [15,5]
73 [8,2]

150 [16,9]250 [28,3]
250 [28,2]
250 [28,3]
250 [28,2]
250 [28,3]
275 [31,1]
250 [28,3]
275 [31,1]
275 [31,1]
275 [31,1]
275 [31,1]
275 [31,1]

in.-lb. [Nm]NT23-003
NT23-004
NT23-005
NT23-007
NT23-010
NT23-015
NT23-020
NT23-025
NT23-030
NT23-040
NT23-050
NT23-070
NT23-100

NT60-003
NT60-004
NT60-005
NT60-007
NT60-010
NT60-015
NT60-020
NT60-025
NT60-030
NT60-040
NT60-050
NT60-070
NT60-100

3:1
4:1
5:1
7:1
10:1
15:1
20:1
25:1
30:1
40:1
50:1
70:1
100:1

in.-lb. [Nm]in.-lb. [Nm]Tpeak

in.-lb. [Nm]J

in.-lb.-sec2x10-4[kg-cm2]

Torsional
Stiffness

in.-lb./arc-min[Nm/arc-min]

NTNTP
0.67 [0,076] 6.3 [0,71] 15.8 [1,8]0.22 [0,024] 6.3 [0,71] 15.8 [1,8]0.22 [0,025] 6.3 [0,71] 15.8 [1,8]0.22 [0,024] 6.3 [0,71] 15.8 [1,8]0.14 [0,016] 6.3 [0,71] 15.8 [1,8]0.21 [0,024] 6.3 [0,71] 15.8 [1,8]0.21 [0,024] 6.3 [0,71] 15.8 [1,8]0.21 [0,024] 6.3 [0,71] 15.8 [1,8]0.13 [0,015] 6.3 [0,71] 15.8 [1,8]0.13 [0,015] 6.3 [0,71] 15.8 [1,8]0.13 [0,015] 6.3 [0,71] 15.8 [1,8]0.13 [0,015] 6.3 [0,71] 15.8 [1,8]0.13 [0,015] 6.3 [0,71] 15.8 [1,8]All ratios are available to ship in 24 hours through the Gearhead Express Program.
1 Ratios are exact, higher ratios and other custom options are also
Tpeak = Allowable momentary peak torque for emergency stop or heavy shock loading.
J = Mass moment of inertia reflected to the input shaft (including pinion assembly).
available, consult factory.
Tr = Rated output torque at rated speed for specific hours of life.

30

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P-8741-BG

10/19

Micron TRUE Planetary® Gearheads
NemaTRUE Size 34/90

EnglishTrue Planetary Gearheads
English - Dimensions are in. (mm)

.24
[6.2]

Metric - Dimensions are mm (in)Ratio1
3:1 to 10:1
15:1 to 100:1

NT34
NT90
Dimension ‘L‘ Dimension ‘L’
in. [mm]in. [mm]

2.62 [66,4]
3.53 [89,6]

2.63 [66,8]
3.53 [89,7]

Backlash[arc-min]

Precision
13 max
15 maxHigh Precision
8 max
9 max

WeightEfficiency

4.2 [1,9]
5.6 [2,5]93%
88%lb. [kg]

AD** = Adapter length
Adapter length will vary depending onmotor.
Efficiency is calculated at 100% of therated torque.

Performance Specifications
Part Number
EnglishMetricRatio1

Tr(1000 rpm)

Tr(2000 rpm)

Tr(3000 rpm)

Tr(4000 rpm)

in.-lb. [Nm]360 [40,7]515 [58,2]
490 [55,4]
470 [53,1]
238 [26,9]454 [51,3]
677 [76,5]652 [73,7]500 [56,5]770 [87,0]
720 [81,4]
770 [87,0]325 [36,7]

320 [36,2]
425 [48,0]400 [45,2]
380 [42,9]212 [24,0]416 [47,0]620 [70,1]
595 [67,2]
454 [51,3]
702 [79,3]
652 [73,7]702 [79,3]
295 [33,3]

295 [33,3]
380 [42,9]355 [40,1]
335 [37,9]200 [22,6]391 [44,2]
587 [66,3]
562 [63,5]432 [48,8]668 [75,5]
618 [69,8]
668 [75,5]280 [31,6]

270 [30,5]350 [39,6]
325 [36,7]305 [34,5]
192 [21,7]
373 [42,1]
551 [62,3]
526 [59,4]
416 [47,0]620 [70,1]
595 [67,2]
620 [70,1]
270 [30,5]510 [57,6]700 [79,1]
700 [79,1]
700 [79,1]
700 [79,1]
850 [96,0]850 [96,1]
850 [96,0]850 [96,0]850 [96,1]
850 [96,0]850 [96,1]
700 [79,1]

in.-lb. [Nm]NT34-003
NT34-004
NT34-005
NT34-007
NT34-010
NT34-015
NT34-020
NT34-025
NT34-030
NT34-040
NT34-050
NT34-070
NT34-100

NT90-003
NT90-004
NT90-005
NT90-007
NT90-010
NT90-015
NT90-020
NT90-025
NT90-030
NT90-040
NT90-050
NT90-070
NT90-100

Torsional
Stiffness

20000 Hour Life

3:1
4:1
5:1
7:1
10:1
15:1
20:1
25:1
30:1
40:1
50:1
70:1
100:1

in.-lb. [Nm]in.-lb. [Nm]Tpeak

in.-lb. [Nm]J

in.-lb.-sec2x10-4[kg-cm2]

in.-lb./arc-min[Nm/arc-min]NT
3.9 [0,44] 16.8 [1,9]1.20 [0,140] 16.8 [1,9]1.20 [0,140] 16.8 [1,9]1.20 [0,140] 16.8 [1,9]0.66 [0,075] 16.8 [1,9]1.20 [0,140] 16.8 [1,9]1.20 [0,140] 16.8 [1,9]1.20 [0,140] 16.8 [1,9]0.66 [0,075] 16.8 [1,9]0.65 [0,074] 16.8 [1,9]0.65 [0,074] 16.8 [1,9]0.65 [0,074] 16.8 [1,9]0.65 [0,074] 16.8 [1,9]NTP
48 [5,4]
48 [5,4]
48 [5,4]
48 [5,4]
48 [5,4]
48 [5,4]
48 [5,4]
48 [5,4]
48 [5,4]
48 [5,4]
48 [5,4]
48 [5,4]
48 [5,4]

All ratios are available to ship in 24 hours through the Gearhead Express Program.
1 Ratios are exact, higher ratios and other custom options are also
Tpeak = Allowable momentary peak torque for emergency stop or heavy shock loading.
J = Mass moment of inertia reflected to the input shaft (including pinion assembly).
available, consult factory.
Tr = Rated output torque at rated speed for specific hours of life.
P-8741-BG

10/19

www.bostongear.com

31

Micron TRUE Planetary® Gearheads
NemaTRUE™ Size 42/115

EnglishTrue Planetary Gearheads
English - Dimensions are in. (mm)Metric - Dimensions are mm (in)Ratio1
3:1 to 10:1
15:1 to 100:1

NT42
NT115
Dimension ‘L‘ Dimension ‘L’
in. [mm]in. [mm]

3.49 [88,7]4.72 [120,0]3.46 [87,9]4.69 [119,1]

Backlash

Weight[arc-min]

Precision
13 max
15 maxlb. [kg]High Precision
8 max
8.9 [4.0]
9 max
11.7 [5.3]

Efficiency
93%88%

AD** = Adapter lengthAdapter length will vary depending onmotor.
Efficiency is calculated at 100% of therated torque.

Performance Specifications
Part NumberEnglishMetric20000 Hour Life
Ratio1

Tr(1000 rpm)
in.-lb. [Nm]NT42-003
NT42-004
NT42-005
NT42-007
NT42-010
NT42-015
NT42-020
NT42-025
NT42-030
NT42-040
NT42-050
NT42-070
NT42-100

NT115-003
NT115-004
NT115-005
NT115-007
NT115-010
NT115-015
NT115-020
NT115-025
NT115-030
NT115-040
NT115-050
NT115-070
NT115-100

3:1
4:1
5:1
7:1
10:1
15:1
20:1
25:1
30:1
40:1
50:1
70:1
100:1

Tr(2000 rpm)
in.-lb. [Nm]

Tr(3000 rpm)
in.-lb. [Nm]

Tr(4000 rpm)

Tpeak

in.-lb. [Nm]in.-lb. [Nm]690 [78.0]
594 [67.1]
530 [59.9]
485 [54.8] 1000 [113.0]
850 [96.1]
698 [78.9]
622 [70.3]
570 [64.4] 1000 [113.0]
810 [55.4]
400 [45.2]
355 [40.1]
325 [36.7] 1000 [113.0]
790 [89.3]
638 [72.1]
562 [63.5]
510 [57.6] 1000 [113.0]
460 [52.0]
412 [46.6]
388 [43.8]
370 [41.8] 1000 [113.0]454 [51.3]
416 [47.0]
391 [44.2]
373 [42.1] 1600 [180.8]1290 [145.8] 1090 [123.2] 985 [111.3] 905 [102.3] 1600 [180.8]1250 [141.2] 1050 [118.6] 945 [106.8] 865 [97.7] 1600 [180.8]
972 [109.8] 878 [99.2]
842 [95.1]
805 [91.0] 1600 [180.8]
1435 [162.2] 1290 [145.8] 1190 [134.5] 1090 [123.2] 1600 [180.8]1395 [157.6] 1250 [141.2] 1150 [118.6] 1050 [118.6] 1600 [180.8]1375 [155.4] 1230 [139.0] 1130 [127.7] 1030 [116.4] 1600 [180.8]
630 [71.2]
575 [65.0]
540 [61.0]
522 [59.0] 1200 [135.6]

J

in.-lb.-sec2x10-4[kg-cm2]

14 [1.6]
3.80 [0.43]
3.80 [0.43]
3.80 [0.43]
1.9 [0.21]
3.9 [0.44]
3.70 [0.42]
3.70 [0.42]
1.9 [0.21]
1.80 [0.20]
1.80 [0.20]
1.80 [0.20]
1.80 [0.20]

Torsional
Stiffness

in.-lb./arc-min[Nm/arc-min]NT
31 [3.5]
31 [3.5]
31 [3.5]
31 [3.5]
31 [3.5]
31 [3.5]
31 [3.5]
31 [3.5]
31 [3.5]
31 [3.5]
31 [3.5]
31 [3.5]
31 [3.5]

NTP
154 [17.4]
154 [17.4]
154 [17.4]
154 [17.4]
154 [17.4]
154 [17.4]
154 [17.4]
154 [17.4]
154 [17.4]
154 [17.4]
154 [17.4]
154 [17.4]
154 [17.4]

All ratios are available to ship in 24 hours through the Gearhead Express Program.
1 Ratios are exact, higher ratios and other custom options are also
Tpeak = Allowable momentary peak torque for emergency stop or heavy shock loading.
J = Mass moment of inertia reflected to the input shaft (including pinion assembly).
available, consult factory.
Tr = Rated output torque at rated speed for specific hours of life.

32

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P-8741-BG

10/19Micron TRUE Planetary® Gearheads
Radial and Axial Load Ratings

NT17FrFa

Radial Forc e, F r, (lb f )X

Distance X (mm)101552025623

50 rpm120534100 rpm

10080445
356250 rpm

60267

500 rpm

40178

1000 rpm

89

20000.2

0.4

0.6

0.8

Radial Forc e, F r, (N)0140

Speedrpm
250

Axial Load, Fa
lbf [N]138 [614]

Speedrpm
250

Axial Load, Fa
lbf [N]
310 [1379]

Speedrpm
250

Axial Load, Fa
lbf [N]
510 [2269]

Speedrpm
250

Axial Load, Fa
lbf [N]760 [3380]01Distance X (in)NT23, NTP23, NT60
350

155613341112

250 rpm

200890500 rpm

1506671000 rpm

10044550

22200.2050.40.60.8
Distance X (in)NT34, NTP34, NT90

Fa

Radial Force , F r, (lb f )

600

Fr

3035

40

Distance X (mm)202502669

100 rpm

1779

250 rpm

1334500 rpm

200 1000 rpm

890

100

445
000.2

50.4

100.6

150.81.0
Distance X (in)201.2

Distance X (mm)2530351.4

401.6

455050 rpm

700
Radial Force , F r, (lb f )1.4

2224300

800

Fa151.250 rpm

400NT42, NTP42, NT115
Fr101.0

5000X

35100 rpm

2500X

3050035592669
2224

250 rpm

40003114

100 rpm

6001779

500 rpm

300 1000 rpm
2001334

100

445

000.2

Radial Force , F r, (N )Radial Force , F r, (lb f )Fa2550 rpm

300FrDistance X (mm)
1520

10890

0.4

0.6

0.8
1.0
1.2
Distance X (in)

1.4

1.6

1.8

2.0

Radial Force , F r , (N )X

5

Radial Force , F r, (N )00

These graphs display the allowable radial load at a given distance (X) from the mounting surface based on an L10 life of 10,000 hours for the mean output speed nmout ,as described on page 9.

P-8741-BG

10/19

www.bostongear.com

33