121(20G) Types (Clutches and brakes)

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121(20G) Types (Clutches and brakes) Specifications

121 (20G) Types

[Specifications]

Model	Size	Dynamic friction torque Td ［N・m］	Static friction torque Ts ［N・m］	Coil (at 20℃)	Heat resistance class	Max. rotation speed ［min^-1］	Rotating part moment of inertia J ［kg・m²］	Total work performed until readjustment of the air gap ET ［J］	Armature pull-in time ta ［s］	Torque build-up time tp ［s］	Torque decaying time td ［s］	Mass ［kg］
Voltage ［V］	Wattage ［W］	Current ［A］	Resistance ［Ω］
121-06-20G	06	5	5.5	24 DC	11	0.46	52	B	3000	1.43×10^-4	36×10⁶	C: 0.020/B: 0.015	C: 0.041/B: 0.033	C: 0.020/B: 0.015	1.5
121-08-20G	08	10	11	24 DC	15	0.63	38	B	3000	4.23×10^-4	60×10⁶	C: 0.023/B: 0.016	C: 0.051/B: 0.042	C: 0.030/B: 0.025	2.7
121-10-20G	10	20	22	24 DC	20	0.83	29	B	3000	1.42×10^-3	130×10⁶	C: 0.025/B: 0.018	C: 0.063/B: 0.056	C: 0.050/B: 0.030	5.5
121-12-20G	12	40	45	24 DC	25	1.04	23	B	3000	4.18×10^-3	250×10⁶	C: 0.040/B: 0.027	C: 0.115/B: 0.090	C: 0.065/B: 0.050	9.6
121-16-20G	16	80	90	24 DC	35	1.46	16	B	3000	1.34×10^-2	470×10⁶	C: 0.050/B: 0.035	C: 0.160/B: 0.127	C: 0.085/B: 0.055	18.5
121-20-20G	20	160	175	24 DC	45	1.88	13	B	2500	4.13×10^-2	10×10⁸	C: 0.090/B: 0.065	C: 0.250/B: 0.200	C: 0.130/B: 0.070	35
121-25-20G	25	320	350	24 DC	60	2.50	9.6	B	2000	1.02×10^-1	20×10⁸	C: 0.115/B: 0.085	C: 0.335/B: 0.275	C: 0.210/B: 0.125	64

Model

Size

Dynamic friction torque Td ［N・m］

Static friction torque Ts ［N・m］

Coil (at 20℃)

Heat resistance class

Max. rotation speed ［min^-1］

Rotating part moment of inertia J ［kg・m²］

Total work performed until readjustment of the air gap ET ［J］

Armature pull-in time ta ［s］

Torque build-up time tp ［s］

Torque decaying time td ［s］

Mass ［kg］

Voltage ［V］

Wattage ［W］

Current ［A］

Resistance ［Ω］

121-06-20G

5.5

24 DC

0.46

3000

1.43×10^-4

36×10⁶

C: 0.020/B: 0.015

C: 0.041/B: 0.033

C: 0.020/B: 0.015

1.5

121-08-20G

24 DC

0.63

3000

4.23×10^-4

60×10⁶

C: 0.023/B: 0.016

C: 0.051/B: 0.042

C: 0.030/B: 0.025

2.7

121-10-20G

24 DC

0.83

3000

1.42×10^-3

130×10⁶

C: 0.025/B: 0.018

C: 0.063/B: 0.056

C: 0.050/B: 0.030

5.5

121-12-20G

24 DC

1.04

3000

4.18×10^-3

250×10⁶

C: 0.040/B: 0.027

C: 0.115/B: 0.090

C: 0.065/B: 0.050

9.6

121-16-20G

24 DC

1.46

3000

1.34×10^-2

470×10⁶

C: 0.050/B: 0.035

C: 0.160/B: 0.127

C: 0.085/B: 0.055

18.5

121-20-20G

160

175

24 DC

1.88

2500

4.13×10^-2

10×10⁸

C: 0.090/B: 0.065

C: 0.250/B: 0.200

C: 0.130/B: 0.070

121-25-20G

320

350

24 DC

2.50

9.6

2000

1.02×10^-1

20×10⁸

C: 0.115/B: 0.085

C: 0.335/B: 0.275

C: 0.210/B: 0.125

*The dynamic friction torque, Td, is measured at a relative speed of 100 min-1. Depending on the initial torque characteristics, break-in to condition the engaging surfaces may also be required.

[Dimensions]

Unit ［mm］

Size	Dimensions of part	Dimensions of shaft
A1	A2	B1	B2	C	D	E	F	G	H	J1	J2	K	L	M	N	Z1	Z2	Q1	Q2	S1	S2	U1	U2	V1	V2	X1	X2	W1, 2
6	52.5	75	80	90	55	80	27.5	53	2.6	95	65.5	40.5	105.5	181	47	33	13.5	6.5	25	20	11	38	12.5	39.5	M4×0.7, length: 8	3-M4×0.7, length: 4	3-120°	60°	4
8	65	90	90	105	65	100	27.5	61	2.6	115	78.5	48.5	126.5	217	57	37	13.5	6.5	30	25	14	45	16	47	M4×0.7, length: 8	3-M4×0.7, length: 6	3-120°	60°	5
10	80	110	110	130	80	125	32.5	72	3.2	142.5	98	62	154	270	72	47	15.5	9	40	30	19	55	21	57	M6×1, length: 11	4-M4×0.7, length: 8	4-90°	45°	5
12	105	135	140	160	90	150	35	81	3.2	165	121	73.5	184	330	92	52	20	11.5	50	40	24	64	27	67	M6×1, length: 11	4-M4×0.7, length: 8	4-90°	45°	7
16	135	160	175	185	112	190	43	97	4.5	207	149	90	221	399	113	62	24.5	11.5	60	50	28	75	31	78	M6×1, length: 11	6-M5×0.8, length: 8	6-60°	30°	7
20	155	200	200	230	132	230	45	109	6	247	187	117	276	504	142	74.5	28	14	80	60	38	90	41.5	93.5	M10×1.5, length: 17	4-M6×1, length: 12	4-90°	45°	10
25	195	240	240	270	160	290	47.5	124	20	305	238	154	334	632	183	101.5	28	14	110	70	42	115	45.5	118.5	M10×1.5, length: 17	8-M6×1, length: 12	8-45°	22.5°	12

Size

Dimensions of part

Dimensions of shaft

W1, 2

52.5

27.5

2.6

65.5

40.5

105.5

181

13.5

6.5

12.5

39.5

M4×0.7, length: 8

3-M4×0.7, length: 4

3-120°

60°

105

100

27.5

2.6

115

78.5

48.5

126.5

217

13.5

6.5

M4×0.7, length: 8

3-M4×0.7, length: 6

3-120°

60°

110

130

125

32.5

3.2

142.5

154

270

15.5

M6×1, length: 11

4-M4×0.7, length: 8

4-90°

45°

105

135

140

160

150

3.2

165

121

73.5

184

330

11.5

M6×1, length: 11

4-M4×0.7, length: 8

4-90°

45°

135

160

175

185

112

190

4.5

207

149

221

399

113

24.5

11.5

M6×1, length: 11

6-M5×0.8, length: 8

6-60°

30°

155

200

230

132

230

109

247

187

117

276

504

142

74.5

41.5

93.5

M10×1.5, length: 17

4-M6×1, length: 12

4-90°

45°

195

240

270

160

290

47.5

124

305

238

154

334

632

183

101.5

110

115

45.5

118.5

M10×1.5, length: 17

8-M6×1, length: 12

8-45°

22.5°

*The input/output shaft keyways are old JIS standard class 2 while the key is old JIS standard class 1. Note that the keyway dimensions of the unit hub part do not conform to JIS standards. Check them on the dimensions table above.

*When inserting pulleys or the like onto input/output shafts, use the supplied insertion set.

*The 121-25-20G base is a casting.

121(20G) Types (Clutches and brakes)

Features of 121(20G) Types (Clutches and brakes)

121(20G) Types (Clutches and brakes) Specifications

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