Hat Standard — Strain Wave Drive

Tornex ZLHS-Series Hat Standard Harmonic Reducer

The ZLHS-Series (Hat Standard) is a high-precision strain wave gear reducer featuring a standard hat-type (cup-less) flexspline design. Available in sizes 14 to 45 with reduction ratios of 30:1 to 160:1, it delivers rated torque from 3.8 Nm to 286 Nm in a single stage. The hat-style output flange provides a compact, low-profile package ideal for collaborative robots, semiconductor equipment, and precision positioning systems where axial space is constrained.

Backlash

≤30 arcsec

Standard precision (≤30 ratio)

Frame Sizes

14-45

7 frame sizes

Variants

C-III, C-IV, TC-II, TC-III

table_chart

ZLHS Rated Parameters

touch_app Click to expand

Frame Sizes

14-45

7 sizes

Rated Torque Range

3.8-286

Available Variants

C-III, C-IV, TC-II, TC-III

Size	Ratio	Rated Torque (Nm)	Peak Torque (Nm)	Avg Load Torque (Nm)	Max Instant Torque (Nm)	Max Input Speed (rpm)
14	30	3.8	8.5	6.5	16	8,000
14	50	5	17	6.5	32	8,000
14	80	7.3	21	10	43	8,000
14	100	7.3	25	10	49	8,000
17	30	8.5	15	11.5	28	7,000
17	50	15	31	23	66	7,000
17	80	20	39	24	84	7,000
17	100	22	48	35	84	7,000
17	120	22	48	35	84	7,000
20	30	14	25	18	47	6,000
20	50	21	52	31	91	6,000
20	80	30	70	42	115	6,000
20	100	35	76	43	138	6,000
20	120	35	81	43	138	6,000
20	160	35	84	43	138	6,000
25	30	25	47	35	91	5,500
25	50	32	91	51	179	5,500
25	80	57	125	82	243	5,500
25	100	62	146	101	267	5,500
25	120	62	155	101	289	5,500
25	160	62	167	101	303	5,500
32	30	50	93	70	190	4,500
32	50	72	205	102	360	4,500
32	80	110	290	158	546	4,500
32	100	124	312	202	618	4,500
32	120	124	333	202	645	4,500
32	160	124	350	202	645	4,500
40	50	130	375	186	650	4,000
40	100	254	551	360	950	4,000
40	160	286	612	439	1,005	4,000
45	50	130	375	186	650	4,000
45	100	254	551	360	950	4,000
45	160	286	612	439	1,005	4,000

Rated torque values measured at 2,000 rpm input speed. Backlash: ≤30 arcsec for ratio ≤30, ≤25 arcsec for ratio >30. Design life: 15,000 hrs (ratio ≤30), 12,000 hrs (ratio >30). Average input speed: 3,500 rpm.

layers

ZLHS Series Variants

touch_app Click to expand

Types

C-III, C-IV, TC-II, TC-III

Housing OD Range

50-190

Design

Hat-style

Cup-less flexspline

ZLHS-XX-XX-C-III — Hollow Shaft Type

筒形中空型: Hollow input, threaded connection to cam

Symbol	Size 14	Size 17	Size 20	Size 25	Size 32	Size 40	Size 45
ØA h7 (mm)	70	80	90	110	142	170	190
ØC h7 (mm)	36	45	50	60	85	100	120
ØD h7 (mm)	74	84	95	115	147	175	195
ØE h7 (mm)	20	25	30	38	45	59	64
ØF h7 (mm)	14	19	21	29	36	46	52
G (mm)	52.5	56.5	51.5	55.5	65.5	79	85
H (mm)	12	12	5	6	7	8	8
I (mm)	20.5	23	25	26	32	38	42
J (mm)	20	21.5	21.5	23.5	26.5	33	35

ZLHS-XX-XX-C-IV — Solid Input Shaft Type

实轴输入型: Solid input shaft with key connection

Symbol	Size 14	Size 17	Size 20	Size 25	Size 32	Size 40	Size 45
ØA h7 (mm)	70	80	90	110	142	170	190
ØE h6 (mm)	6	8	10	14	14	16	19
F (mm)	50.5	56	63.5	72.5	84.5	100	108
G (mm)	15	17	21	26	26	31	31
H (mm)	20.5	23	25	26	32	38	42
I (mm)	15	16	17.5	20.5	26.5	31	35
J (mm)	14	16	20	25	25	30	30
K (mm)	9	10	10.5	10.5	12	14	15
ØT (mm)	64	74	84	102	132	158	180

ZLHS-XX-XX-TC-II — Simplified Combination Type

简易组合型: Cross-slider coupling, input shaft to cam

Symbol	Size 14	Size 17	Size 20	Size 25	Size 32	Size 40	Size 45
ØA h6 (mm)	50	60	70	85	110	135	155
ØB1 (mm)	14	18	21	26	26	32	32
D* (mm)	28.5	32.5	33.5	37	44	53	58
E (mm)	23.5	26.5	29	34	42	51	56.5
H (mm)	14.1	16	17.5	18.7	23.4	29	32
ØM1 h7 (mm)	70	80	90	110	142	170	190
ØM2 h7 (mm)	48	60	70	88	114	140	158
ØR (mm)	64	74	84	102	132	158	180

ZLHS-XX-XX-TC-III — Simplified Combination Type III

Hollow input, simplified combination with threaded fasteners

Symbol	Size 14	Size 17	Size 20	Size 25	Size 32	Size 40	Size 45
ØA h6 (mm)	50	60	70	85	110	135	155
C (mm)	52.5	56.5	51.5	55.5	65.5	79	85
D1* (mm)	16	16	9.5	10	12	13	13.5
D2 (mm)	23.5	26.5	29	34	42	51	56.5
ØH h6 (mm)	70	80	90	110	142	170	190
ØG H6 (mm)	48	60	70	88	114	140	158
ØR (mm)	64	74	84	102	132	158	180
Øf (mm)	14	19	21	29	36	46	52

All dimensions in mm. For complete engineering drawings and tolerance specifications, consult the product manual. Contact engineering for custom configurations.

precision_manufacturing

Hat-Type Flexspline Design

The ZLHS series features a hat-shaped flexspline that eliminates the cup extension, providing a more compact axial profile compared to standard cup types. Ideal for applications where axial space is constrained yet zero-backlash precision is required.

Four Variant Options

Choose from four input configurations: C-III (hollow shaft), C-IV (solid input shaft), TC-II (cross-slider coupling), and TC-III (simplified combination). Each variant is optimized for different motor integration requirements while maintaining identical torque capacity.

settings_backup_restore

Flexible Integration

The hat-type output flange allows direct mounting to driven loads with minimal adapter hardware. Combined with integrated cross-roller bearings (C type), the ZLHS series provides high moment stiffness and axial load capacity in a compact, lightweight package.

Technical Documentation

description

Datasheet

PDF • 4.2 MB

download

Configure Your ZLHS-Series

Need help selecting the right variant, size, or ratio for your application? Our application engineering team is ready to assist with sizing calculations and configuration for your specific motion control needs.