WPU-SDH Series – Flat Type

Open Type Unit (Hollow Shaft)

The WPU-SDH Series is a compact hollow-shaft gearhead engineered for high torque output, precision, and durability. Utilizing advanced FLEXWAVE gear technology within an integrated housing, it achieves zero backlash and excellent repeatability. The large hollow input shaft allows easy cable or shaft routing, while the built-in cross roller bearing and output flange provide direct, rigid load support, eliminating the need for additional external bearings.

Features:

Zero backlash
Large hollow input shaft for easy integration
Positioning accuracy
High torsional stiffness and torque capacity
Robust cross roller output bearing for stability
Output flange for direct load mounting

Downloads

Selection Configurator

Flat Type D Catalog

* For code details, check Dimensions Table

Ratio Matrix Availability

Frame Size	50 Reduction Ratio	80 Reduction Ratio	100 Reduction Ratio	120 Reduction Ratio	160 Reduction Ratio
35	✔️	✔️	✔️	✔️	❌
42	✔️	✔️	✔️	✔️	✔️
50	✔️	✔️	✔️	✔️	✔️
63	✔️	✔️	✔️	✔️	✔️
80	✔️	✔️	✔️	✔️	✔️

Reducer Specifications

Frame Size	Ratio R^*1	Nominal Output Torque ^*2 [Nm]	Maximum Output Torque ^*3 [Nm]	Emergency Stop Torque^*4 [Nm]	Nominal Input Speed ^*5 [r/min)	Maximum Input Speed ^*6 [r/min)	Life ^*7 [hours]
35	50	3.7	12	24	3000	8500	7000
35	80	5.4	16	29	3000	8500	7000
35	100	5.4	19	31	3000	8500	7000
42	50	11	23	48	3000	7300	7000
42	80	15	29	52	3000	7300	7000
42	100	16	37	55	3000	7300	7000
42	120	16	37	55	3000	7300	7000
50	50	17	39	69	3000	6500	7000
50	80	24	51	75	3000	6500	7000
50	100	28	57	76	3000	6500	7000
50	120	28	57	76	3000	6500	7000
63	50	27	96	127		5600	7000
63	80	44	96	147	3000	5600	7000
63	100	47	110	152	3000	5600	7000
63	120	47	110	152	3000	5600	7000
80	05	53	151	268	3000	4800
80	80	82	212	334	3000	4800	7000
80	100	98	233	359	3000	4800	7000
80	120	96	233	359	3000	4800	7000

Reduction ratio is to be calculated by the formula in the previous page, using R value in this table.
The maximum allowable value at the input rotation speed of 2000r/min
The maximum torque when starting and stopping.
The maximum torque when it receives shock.
The maximum average input speed.
The maximum input speed.
The life time at the input rotation speed of 2000 r/min and nominal output torque.

Open Type: Unit (Hollow Shaft)

WPU-□-□-SDH

Frame Size	Weight Kg	Moment of Inertia x10-⁴kgm²
35	0.49	0.0839
42	0.66	0.180
50	0.84	0.352
63	1.4	0.940
80	2.8	3.47

[mm]

Frame Size	LA	LB	LC	LD	LE	LF	LG	LH	LJ	LK	LL	LP	LQ	LR
35	43	36	52	70	45.5	19.5	12	14	6.5	7.5	9	2.5	5.5	6.5
42	52	45	62	80	48	20.5	12	15.5	7	8.5	10	2.5	5.5	6.5
50	61.4	50	73	90	42	21.5	5	15.5	7	8.5	10.5	-	-	-
63	76	60	87	110	46.5	24	6	16.5	6	10.5	10.5	-	-	-
80	99	75	114	142	55	28.6	7	19.4	7.5	11.9	12	-	-	-

Frame Size	SA	SB	SC	SD	SE	SF	M	ST	SU	N	LT
35	64	-	14	20	74	36	8	3.5	M3	8	M3 X 4.5, ∅ 3.5 X 5.5
42	74	-	19	25	84	45	12	3.5	M3	12	M3 X 4.5, ∅ 3.5 X 6.5
50	84	25.5	21	30	95	-	12	3.5	M3 X 6	12	M3 X 4.5, ∅ 3.5 X 6.5
63	102	33.5	29	38	115	-	12	4.5	M3 X 6	12	M4 X 6, ∅ 4.5 X 8.5
80	132	48	41	54	147	-	12	5.5	M3 X 6	12	M5 X 8, ∅ 5.5 X 7.6