Micron TRUE Planetary® Gearheads
NemaTRUE™ 90

Right Angle Gearheads
Ready for Immediate Delivery
Precision

13 arc-minutes

Frame Sizes

NEMA 23, 34, 42

Torque Capacity

up to 255 Nm

Ratio Availability

1:1 thru 500:1

Radial load capacity

up to 2900 N

Mounting System

RediMount™

1

Tapered roller bearings
provide high radial and axial load capacity

2

Innovative PowerTRUE gearing
delivers smooth, quiet geared reduction

3 Tapered roller bearings

5

provide high axial load carrying
capabilities

4

HRC 55-60 steel gears
provide superior wear resistance andincreased backlash integrity

41
2

5 RediMount systemprovides error-free motor installation

3

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.

34

www.bostongear.com

P-8741-BG

10/19

Micron TRUE Planetary® Gearheads
NemaTRUE 90 Size 23

EnglishRight Angle Gearheads
3.32(84.3)

1.00(25.4)

ø 1.500 (38.10)
ø 1.499 (38.07)

2.12(53.8).75(19.1)FLAT.25 (6.4)

ø .3750 (9.525)
ø .3745 (9.512).360 FLAT(9.1)
2.27 SQ.
(57.7)

L
K.062(1.57)

ø .195 (4.95) THRU HOLES
4PL EQUALLY SPACED ON A
ø 2.625 (66.68) BOLT CIRCLE.14(3.56)

2.40 SQ.
(61)

AD*

Ratio1
1:1 to 5:1P
5:1T to 50:1
60:1 to 500:1

Dimension ‘K‘ Dimension ‘L’ Backlashin. [mm]in. [mm][arc-min]3.11 [79]3.79 [96]4.48 [114]4.31 [109,5]
4.99 [127]5.68 [144]13 max
15 max
15 max

WeightEfficiency

3.0 [1,4]
3.4 [1,5]
3.8 [1,6]

98%
93%
88%

lb. [kg]

Dimensions are in. (mm)AD** = Adapter length
Adapter length will vary depending on motor.
Efficiency is calculated at 100% of the rated torque.

Performance Specifications
10000 Hour Life
Part
Number
NTR23-001
NTR23-002
NTR23-003
NTR23-004
NTR23-005P
NTR23-005T
NTR23-006
NTR23-009
NTR23-010
NTR23-012
NTR23-015
NTR23-020
NTR23-025
NTR23-030
NTR23-040
NTR23-050
NTR23-060
NTR23-075
NTR23-090
NTR23-100
NTR23-120
NTR23-125
NTR23-150
NTR23-200
NTR23-250
NTR23-300
NTR23-400
NTR23-500

Ratio

1

1:1
2:1
3:1
4:1
5:1P
5:1T
6:1
9:1
10:1
12:1
15:1
20:1
25:1
30:1
40:1
50:1
60:1
75:1
90:1
100:1
120:1
125:1
150:1
200:1
250:1
300:1
400:1
500:1

20000 Hour Life

Tr
Tr
Tr
(1000 rpm) (3000 rpm) (5000 rpm)
in.-lb. [Nm]in.-lb. [Nm]in.-lb. [Nm]59 [7]
130 [15]83 [9]
61 [7]
50 [6]
179 [20]153 [17]
97 [11]157 [18]
72 [8]
100 [11]74 [8]
60 [7]
102 [12]75 [9]
62 [7]
163 [18]
104 [12]104 [12]163 [18]76 [9]
63 [7]
104 [12]164 [19]
63 [7]
104 [12]77 [9]
63 [7]

54 [6]
118 [13]75 [9]
56 [6]
46 [5]
153 [17]130 [15]83 [9]
144 [16]
61 [7]
91 [10]67 [8]
55 [6]
98 [11]
72 [8]
59 [7]
161 [18]
102 [12]102 [12]162 [18]75 [9]
62 [7]
103 [12]163 [18]
62 [7]
104 [12]76 [9]
63 [7]

49 [6]
107 [12]68 [8]
50 [6]
41 [5]
138 [16]
126 [14]80 [9]
130 [15]59 [7]
83 [9]
61 [7]
50 [6]
94 [11]
69 [8]
57 [6]
158 [18]100 [11]101 [11]161 [18]
74 [8]
60 [7]
102 [12]162 [18]
62 [7]
103 [12]76 [9]
62 [7]

Tpeak
in.-lb. [Nm]195 [22]360 [41]
270 [31]238 [27]
180 [20]366 [41]366 [41]289 [33]366 [41]
252 [28]297 [34]366 [41]
198 [22]305 [34]
263 [30]203 [23]366 [41]311 [35]
313 [35]366 [41]
270 [31]207 [23]316 [36]366 [41]207 [23]319 [36]274 [31]207 [23]

J

Tr
Tr
Tr
in.-lb.-sec2x10-4(1000 rpm) (3000 rpm) (5000 rpm)
[kg-cm2]
in.-lb. [Nm]in.-lb. [Nm]in.-lb. [Nm]54 [6]
120 [14]76 [9]
56 [6]
46 [5]
175 [20]149 [17]95 [11]155 [18]70 [8]
99 [11]
73 [8]
60 [7]
102 [11]75 [8]
61 [7]
163 [18]103 [12]103 [12]163 [18]76 [9]
62 [7]
104 [12]164 [18]
63 [7]
104 [12]77 [9]
63 [7]

50 [6]
109 [12]70 [8]
51 [6]
42 [5]
132 [15]120 [14]76 [9]
138 [16]56 [6]
88 [10]64 [7]
53 [6]
96 [11]
71 [8]
58 [7]
160 [18]
101 [11]102 [11]161 [18]75 [8]
61 [7]
103 [12]163 [18]
62 [7]
104 [12]76 [9]
63 [7]

45 [5]
99 [11]
63 [7]
46 [5]
38 [4]
112 [13]116 [13]74 [8]
120 [14]55 [6]
76 [9]
56 [6]
46 [5]
90 [10]67 [8]
55 [6]
157 [18]
99 [11]
100 [11]160 [18]
73 [8]
60 [7]
102 [11]162 [18]
61 [7]
103 [12]76 [9]
62 [7]

Torsional
Stiffness
in.-lb./arc-min[Nm/arc-min]7.01 [0,79] 5.6 [0,6]3.59 [0,41] 8.5 [1,0]3.09 [0,35] 9.6 [1,1]2.87 [0,32] 10.1 [1,1]2.81 [0,32] 10.3 [1,2]3.69 [0,42] 10.3 [1,2]3.67 [0,41] 6.7 [0,8]3.08 [0,35] 8.5 [1,0]3.48 [0,39] 6.6 [0,7]2.95 [0,33] 9.3 [1,1]2.89 [0,33] 9.8 [1,1]
2.76 [0,31] 9.3 [1,0]2.71 [0,31] 9.8 [1,1]
2.83 [0,32] 8.0 [0,9]2.69 [0,30] 9.0 [1,0]2.64 [0,30] 9.6 [1,1]
3.68 [0,42] 6.5 [0,7]2.95 [0,33] 8.4 [0,9]3.09 [0,35] 8.3 [0,9]3.50 [0,40] 6.5 [0,7]2.96 [0,33] 9.2 [1,0]2.76 [0,31] 9.7 [1,1]
2.91 [0,33] 8.4 [0,9]3.43 [0,39] 6.1 [0,7]2.72 [0,31] 9.7 [1,1]2.84 [0,32] 8.0 [0,9]2.71 [0,31] 9.0 [1,0]2.66 [0,30] 9.6 [1,1]All ratios are available to ship in 24 hours through the Gearhead Express Program.
Ratio 5P is designed using only PowerTRUE face gearing technology.
Ratio 5T adds a True Planetary gearing stage for increased torque capacity.
1
Ratios are exact, higher ratios and other custom options are also available, consult factory.
Tr = Rated output torque at rated speed for specific hours of life.
P-8741-BG

10/19

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

www.bostongear.com

35

Micron TRUE Planetary® Gearheads
NemaTRUE™ 90 Size 34

EnglishRight Angle Gearheads
4.24(108) 2.47

ø 2.875 (73.03)
ø 2.874 (73.00)

1.25(32.8)(63)

1/8” (3.2) AMERICAN STDSQUARE KEY

14
(3.5)

.375
(9.5)

ø .5000 (12.700)
ø .4995 (12.687).556(14.1)

3.25 SQ.
(82.6)
L.75(19.1)

K

ø .218 (5.54) THRU HOLES
4PL. EQUALLY SPACED ON A
ø 3.875 (98.43) BOLT CIRCLE.062(1.57).17(4.32)

3.54 SQ.
(90)

AD*

Ratio1
1:1 to 5:1P
5:1T to 50:1
60:1 to 500:1

Dimension ‘K‘ Dimension ‘L’ Backlashin. [mm]in. [mm][arc-min]3.99 [101]4.89 [124]5.79 [147]5.76 [146]
6.66 [169]7.56 [192]

13 max
15 max
15 max

WeightEfficiency

6.0 [2,7]
7.4 [3,4]
8.8 [4,0]

98%
93%
88%

lb. [kg]

Dimensions are in. (mm)AD** = Adapter length
Adapter length will vary depending on motor.
Efficiency is calculated at 100% of the rated torque.

Performance Specifications
10000 Hour Life
Part
Number
NTR34-001
NTR34-002
NTR34-003
NTR34-004
NTR34-005P
NTR34-005T
NTR34-006
NTR34-009
NTR34-010
NTR34-012
NTR34-015
NTR34-020
NTR34-025
NTR34-030
NTR34-040
NTR34-050
NTR34-060
NTR34-075
NTR34-090
NTR34-100
NTR34-120
NTR34-125
NTR34-150
NTR34-200
NTR34-250
NTR34-300
NTR34-400
NTR34-500

Ratio

1

1:1
2:1
3:1
4:1
5:1P
5:1T
6:1
9:1
10:1
12:1
15:1
20:1
25:1
30:1
40:1
50:1
60:1
75:1
90:1
100:1
120:1
125:1
150:1
200:1
250:1
300:1
400:1
500:1

20000 Hour Life

Tr
Tr
Tr
(1000 rpm) (3000 rpm) (5000 rpm)
in.-lb. [Nm]in.-lb. [Nm]in.-lb. [Nm]

168 [19]381 [43]
251 [28]
192 [22]142 [16]508 [57]448 [51]296 [33]462 [52]
226 [26]305 [34]
233 [26]
172 [19]311 [35]
238 [27]
175 [20]479 [54]
315 [36]316 [36]480 [54]242 [27]
178 [20]317 [36]481 [54]
178 [20]317 [36]
243 [27]
179 [20]153 [17]348 [39]229 [26]
176 [20]129 [15]432 [49]381 [43]
251 [28]422 [48]
192 [22]278 [31]
213 [24]
157 [18]298 [34]
228 [26]
168 [19]472 [53]
310 [35]311 [35]476 [54]
238 [27]
175 [20]314 [35]
479 [541]
177 [20]316 [36]242 [27]
178 [20]139 [16]315 [36]207 [23]
159 [18]
117 [13]420 [47]
370 [42]244 [28]381 [43]
187 [21]251 [28]
192 [22]142 [16]285 [32]
218 [25]
160 [18]465 [53]305 [34]
307 [35]472 [53]235 [27]
172 [19]311 [35]477 [54]
175 [20]315 [36]
241 [27]
177 [20]Tpeak
in.-lb. [Nm]493 [56]1113 [126]905 [102]695 [79]581 [66]1113 [126]1113 [126]986 [111]
1113 [126]752 [85]1018 [115]1113 [126]635 [72]1045 [118]792 [89]653 [74]1113 [126]1080 [122]1085 [123]1113 [126]817 [92]666 [75]
1096 [124]1113 [126]675 [76]1107 [125]832 [94]680 [77]

J

Tr
Tr
Tr
in.-lb.-sec2x10-4(1000 rpm) (3000 rpm) (5000 rpm)
[kg-cm2]
in.-lb. [Nm]in.-lb. [Nm]in.-lb. [Nm]155 [18]352 [40]232 [26]
178 [20]131 [15]497 [56]439 [50]289 [33]456 [52]
221 [25]
301 [34]
230 [26]
169 [19]309 [35]
237 [27]
174 [20]478 [54]314 [36]315 [36]479 [54]
241 [27]
177 [20]316 [36]481 [54]
178 [20]317 [36]
243 [27]
179 [20]142 [16]321 [36]212 [24]
162 [18]
119 [13]399 [45]352 [40]232 [26]404 [46]
178 [20]266 [30]
204 [23]150 [17]292 [33]
224 [25]
165 [19]469 [53]308 [35]309 [35]474 [54]237 [27]173 [20]313 [35]
478 [54]
176 [20]315 [36]
241 [27]
178 [20]128 [14]291 [33]
192 [22]147 [17]108 [12]387 [44]342 [39]
225 [25]352 [40]173 [19]232 [26]
178 [20]131 [15]275 [31]210 [24]
155 [18]460 [52]
301 [34]
304 [34]469 [53]
232 [26]
169 [19]309 [35]475 [54]
174 [20]314 [35]240 [27]
177 [20]27.5 [3,11]
14.1 [1,59]
12.1 [1,37]
11.2 [1,27]
11.0 [1,25]
14.5 [1,64]
14.4 [1,63]
12.1 [1,37]
13.7 [1,54]
11.6 [1,31]
11.3 [1,28]
10.8 [1,22]
10.6 [1,20]
11.1 [1,25]
10.6 [1,19]
10.4 [1,17]
14.4 [1,63]
11.6 [1,31]
12.1 [1,37]
13.7 [1,55]
11.6 [1,31]
10.8 [1,23]
11.4 [1,29]
13.5 [1,52]
10.7 [1,21]
11.1 [1,26]
10.6 [1,20]
10.4 [1,18]

Torsional
Stiffness
in.-lb./arc-min[Nm/arc-min]12.6 [1,4]19.1 [2,2]21.5 [2,4]22.6 [2,5]23.1 [2,6]23.1 [2,6]15.0 [1,7]19.0 [2,1]
14.8 [1,7]20.9 [2,4]21.9 [2,5]20.8 [2,4]21.9 [2,5]17.9 [2,0]20.2 [2,3]21.4 [2,4]14.5 [1,6]18.7 [2,1]
18.6 [2,1]
14.6 [1,7]
20.7 [2,3]21.8 [2,5]18.7 [2,1]
13.6 [1,5]21.8 [2,5]17.9 [2,0]20.2 [2,3]21.4 [2,4]All ratios are available to ship in 24 hours through the Gearhead Express Program.
Ratio 5P is designed using only PowerTRUE face gearing technology.
Ratio 5T adds a True Planetary gearing stage for increased torque capacity.
1
Ratios are exact, higher ratios and other custom options are also available, consult factory.
Tr = Rated output torque at rated speed for specific hours of life.

36

www.bostongear.com

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

P-8741-BG

10/19

Micron TRUE Planetary® Gearheads
NemaTRUE™ 90 Size 42

EnglishRight Angle Gearheads
5.28
(134)

3.02
(77)

ø 2.187 (55.55)
ø 2.186 (55.52)

1.50(38.1)

3/16” (4.8) AMERICAN STDSQUARE KEY

.17
(4.4)

.50 (12.7)

ø .6250 (15.875)
ø .6245 (15.862).706(17.9)
4.25 SQ.
(108)

.875
(22.2)

L.093(2.36)

K

ø .281 (7.14) THRU HOLES
4PL EQUALLY SPACED ON A
ø 4.950 (125.73) BOLT CIRCLE.21(5.33)

4.53 SQ.
(115)

AD*

Ratio1
1:1 to 5:1P
5:1T to 50:1
60:1 to 500:1

Dimension ‘K‘ Dimension ‘L’ Backlashin [mm]in [mm][arc-min]

WeightEfficiency

5.40 [137]6.63 [168,4]
7.87 [200]7.67 [195]8.90 [226]10.13 [257]

13 max
15 max
15 max12 [5,4]14.8 [6,7]
17.6 [8,0]

98%
93%
88%

lb [kg]Dimensions are inch (mm)AD** = Adapter length
Adapter length will vary depending on motor.
Efficiency is calculated at 100% of the rated torque.

Performance Specifications
10000 Hour Life
Part
Number
NTR42-001
NTR42-002
NTR42-003
NTR42-004
NTR42-005P
NTR42-005T
NTR42-006
NTR42-009
NTR42-010
NTR42-012
NTR42-015
NTR42-020
NTR42-025
NTR42-030
NTR42-040
NTR42-050
NTR42-060
NTR42-075
NTR42-090
NTR42-100
NTR42-120
NTR42-125
NTR42-150
NTR42-200
NTR42-250
NTR42-300
NTR42-400
NTR42-500

Ratio1

1:1
2:1
3:1
4:1
5:1P
5:1T
6:1
9:1
10:1
12:1
15:1
20:1
25:1
30:1
40:1
50:1
60:1
75:1
90:1
100:1
120:1
125:1
150:1
200:1
250:1
300:1
400:1
500:1

20000 Hour Life

Tr
Tr
Tr
(1000 rpm) (3000 rpm) (5000 rpm)
in-lb [Nm]in-lb [Nm]in-lb [Nm]496 [56]885 [100]687 [78]458 [52]343 [39]
1346 [152]1041 [118]808 [91]1072 [121]538 [61]832 [94]554 [63]416 [47]851 [96]566 [64]425 [48]1111 [126]861 [97]
863 [97]1114 [126]574 [65]430 [49]865 [98]
1116 [126]432 [49]867 [98]577 [65]433 [49]452 [51]808 [91]627 [71]418 [47]313 [35]1117 [126]885 [100]687 [78]979 [111]458 [52]760 [86]506 [57]
379 [43]814 [92]542 [61]407 [46]
1095 [124]847 [96]851 [96]1105 [125]566 [64]423 [48]858 [97]1112 [126]428 [48]863 [98]575 [65]431 [49]409 [46]730 [83]567 [64]378 [43]283 [32]958 [108]859 [97]667 [75]885 [100]444 [50]687 [78]458 [52]343 [39]778 [88]
518 [59]388 [44]1080 [122]832 [94]
838 [95]
1095 [124]558 [63]416 [47]851 [96]1107 [125]425 [48]860 [97]572 [65]429 [48]Tpeak
in-lb [Nm]

J
Tr
Tr
Tr
in-lb-sec2x10-4(1000 rpm) (3000 rpm) (5000 rpm)
[kg-cm2]
in-lb [Nm]1620 [183]2255 [255]2039 [230]1584 [179]1305 [147]2255 [255]2255 [255]2241 [253]2255 [255]1728 [195]2255 [255]2255 [255]1458 [165]2255 [255]1836 [207]1499 [169]2255 [255]2255 [255]2255 [255]2255 [255]1897 [214]1539 [174]2255 [255]2255 [255]1562 [176]2255 [255]
1944 [220]1580 [178]458 [52]817 [92]635 [72]423 [48]317 [36]1262 [143]1018 [115]791 [89]
1059 [120]526 [59]822 [93]547 [62]410 [46]845 [96]563 [64]422 [48]1109 [125]859 [97]861 [97]1113 [126]573 [65]429 [48]864 [98]
1116 [126]431 [49]866 [98]577 [65]433 [49]

in-lb [Nm]in-lb [Nm]418 [47]378 [43]746 [84]674 [76]579 [65]524 [59]386 [44]349 [39]289 [33]
261 [30]907 [102] 778 [88]817 [92]794 [90]635 [72]616 [70]938 [106] 817 [92]423 [48]410 [46]728 [82]635 [72]
485 [55]423 [48]364 [41]317 [36]798 [90]752 [85]532 [60]500 [57]
399 [45]375 [42]1089 [123] 1069 [121]841 [95]
822 [93]845 [96]830 [94]1101 [124] 1089 [123]563 [64]552 [62]420 [47]410 [46]855 [97]845 [96]1110 [125] 1104 [125]427 [48]422 [48]862 [97]857 [97]574 [65]571 [64]430 [49]428 [48]46.7 [5,28]
23.9 [2,71]
20.6 [2,33]
19.1 [2,16]
18.8 [2,12]24.6 [2,78]
24.5 [2,77]
20.5 [2,32]
23.2 [2,63]
19.6 [2,22]
19.3 [2,18]
18.4 [2,08]
18.0 [2,04]
18.9 [2,13]18.0 [2,03]
17.6 [1,99]
24.6 [2,78]
19.7 [2,22]
20.6 [2,33]
23.3 [2,64]
19.7 [2,23]
18.4 [2,08]
19.4 [2,19]22.9 [2,59]
18.1 [2,05]
18.9 [2,14]
18.1 [2,04]
17.7 [2,00]

Torsional
Stiffness
in-lb/arc-min[Nm/arc-min]15.0 [1,7]24.7 [2,8]28.0 [3,2]29.4 [3,3]30.0 [3,4]30.0 [3,4]20.1 [2,3]25.1 [2,8]20.1 [2,3]27.5 [3,1]
28.8 [3,3]27.5 [3,1]
28.8 [3,2]24.6 [2,8]27.2 [3,1]
28.5 [3,2]19.7 [2,2]25.0 [2,8]24.8 [2,8]19.9 [2,2]27.3 [3,1]
28.7 [3,2]25.0 [2,8]19.4 [2,2]28.7 [3,2]24.6 [2,8]27.1 [3,1]
28.5 [3,2]All ratios are available to ship in 24 hours through the Gearhead Express Program.
Ratio 5P is designed using only PowerTRUE face gearing technology.
Ratio 5T adds a True Planetary gearing stage for increased torque capacity.
1
Ratios are exact, higher ratios and other custom options are also available, consult factory.
Tr = Rated output torque at rated speed for specific hours of life.
P-8741-BG

10/19

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

www.bostongear.com

37

Micron TRUE Planetary® Gearheads
Radial and Axial Load Ratings

r

F

a

1334

250

100 rpm

1112

200

250 rpm

890

150

500 rpm1000 rpm

667

100

445

50

222
0

0.2

0

0.4
0.6
Distance X (in)

5

500

0.8

Distance X (mm)
15
20

10

1

25

30
2224

50 rpm

1779

100 rpm

300

1334

250 rpm
500 rpm1000 rpm

200

890

100

445

0

0

0.2

0

5

0.4

0.6
0.8
Distance X (in)

NTR42
700

F

a

Radial Force , F r, (lb f )r15Distance X (mm)
20
25

30

35

40
3114
2669

100 rp m

500
400

2224
1779

250 rpm
500 rpm300

13341000 rpm

200

890
445

100
0

0

0.2

0.4

0.6

0.8
1.0
Distance X (in)1.2

Axial Load, Fa
lbf [N]250 [1110]
200 [890]
150 [670]
120 [530]
90 [400]

Speed
rpm
50
100
250
500
1000

Axial Load, Fa
lbf [N]
340 [1510]
270 [1200]
200 [890]
160 [710]
130 [580]

Speed
rpm
50
100
250
500
1000

Axial Load, Fa
lbf [N]460 [2050]
370 [1650]
270 [1200]
210 [930]
170 [760]

0
1.2

1.0

50 rpm600

F

10Radial Force , F r, (N )Radial Force , F r, (lb f )

a

400

Speed
rpm
50
100
250
500
1000

0

r

F

X

25

50 rpm

NTR34
F

20

300

0

X

Distance X (mm)
10
15

5

1.4

1.6

Radial Force,F r, (N )F

Radial Force , F r, (lb f )X

0Radial Force , F r, (N )

NTR23

0

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.

38

www.bostongear.com

P-8741-BG

10/19