WX/WXD Small Cross Universal Joint | 11.2-1120 N·m, 45° Angle

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WX/WXD Small Cross Universal Joint Coupling – Single/Double, JB/T5901-1991, 40Cr

Model Number
Check below, custom

Outer Diameter (mm)	Length (mm)	Bore Diameter Range (mm)
14	22	3–8
20	25	3–10
20	30	3–10
25	30	4–14
25	35	4–14
30	35	5–16
30	42	5–16
35	50	5–19
40	50	6–22
40	66	6–22
45	55	8–25
45	66	8–25
55	66	12–30
55	78	12–30
65	90	14–38
80	114	14–45

Note: Non‑standard customization is also available (as indicated in the original text). All dimensions are in millimeters (mm).

Product Description

WX/WXD Small Cross Universal Joint Coupling – Single/Double, JB/T5901-1991, 40Cr, 11.2–1120 N·m

The Apexcoupling WX/WXD series is a precision small cross universal joint coupling manufactured to the JB/T5901-1991 standard. Available in single joint (WXD) and double joint (WX) configurations, it is designed for reliable power transmission between two shafts on the same plane with an angular misalignment of up to 45° per joint. Constructed from 40Cr alloy steel with optional 304/316 stainless steel, the series delivers high strength, excellent wear resistance, and long service life. Featuring H7 precision bore with keyway, hexagon, or square hole options, the WX/WXD series is the ideal solution for packaging machinery, woodworking equipment, multi-spindle drills, metallurgical machinery, and general automation applications.

✅ JB/T5901-1991 standard – quality assured. Single (WXD) or double (WX) joint. 45° angle per joint. 40Cr alloy steel or 304/316 stainless steel. H7 bore with keyway/hex/square options. 11.2–1120 N·m torque. 4000 RPM max speed. OEM custom available.

Key Technical Specifications

Parameter	WXD Type (Single)	WX Type (Double)
Standard	JB/T5901-1991	JB/T5901-1991
Structure	Single universal joint	Double universal joint
Nominal Torque Range	11.2 – 1120 N·m	11.2 – 1120 N·m
Maximum Angle Per Joint	45° (limit) / 30° (recommended)	45° (limit) / 30° (recommended)
Max Speed (Pin/Block)	1000 RPM	1000 RPM
Max Speed (Needle Bearing)	4000 RPM	4000 RPM
Bore Tolerance	H7	H7
Bore Options	Keyway, hexagon hole, square hole	Keyway, hexagon hole, square hole
Body Material	40Cr alloy steel (standard); 304/316 stainless steel (optional)	40Cr alloy steel (standard); 304/316 stainless steel (optional)
Surface Treatment	Black oxide, natural, nickel plated, chrome plated, sandblasted	Black oxide, natural, nickel plated, chrome plated, sandblasted
Customized support	OEM, ODM, OBM	OEM, ODM, OBM
Applicable Industries	Packaging machinery, woodworking, multi-spindle drills, metallurgy, CNC, automation	Packaging machinery, woodworking, multi-spindle drills, metallurgy, CNC, automation
Place of Origin	Guangdong, China	Guangdong, China

🔧 Custom bores, keyways, hexagon/square holes, materials (304/316 stainless steel), and special finishes available. Large semi-finished stock – fast delivery. Contact us with your specifications.

WX/WXD Series – Model Range & Specifications (JB/T5901-1991)

Model	Nominal Torque (N·m)	d max (mm)	D (mm)	L (mm)	L1 (mm)	L2 (mm)	L3 (mm)	L4 (mm)	Moment of Inertia (WXD)	Moment of Inertia (WX)
WX1 / WXD1	11.2	10	16	22	30	60	80	20	0.05	0.07
WX2 / WXD2	22.4	12	20	22	32	64	90	26	0.09	0.15
WX3 / WXD3	45	14	25	27	40	80	112	32	0.15	0.22
WX4 / WXD4	71	18	32	30	46	92	130	38	0.32	0.49
WX5 / WXD5	140	22	40	38	58	116	164	48	0.59	0.91
WX6 / WXD6	280	28	50	44	69	138	196	58	1.03	1.64
WX7 / WXD7	560	35	60	60	91	182	252	70	2.31	3.38
WX8 / WXD8	1120	42	75	84	122	244	336	92	4.41	6.63

📐 Additional sizes and custom dimensions available upon request. Contact our engineering team for custom sizing.

WX (Double) vs WXD (Single) – Which One Do You Need?

Feature	WXD (Single Joint)	WX (Double Joint)
Angular misalignment	✅ Up to 45°	✅ Up to 45° per joint
Parallel offset	❌ No	✅ Yes
Total articulation	Up to 45°	Up to 90°
Length	Shorter	Longer
Moment of inertia	Lower	Higher
Synchronous rotation	No (speed fluctuation)	Yes (with proper phasing)
Best for	Shafts intersecting at an angle on the same plane	Shafts both angled and offset

Rule of thumb:

Use WXD (single joint) for applications with constant angular misalignment where speed fluctuation is acceptable.
Use WX (double joint) for applications requiring parallel offset compensation or synchronous rotation between the driving and driven shafts .

💡 For synchronous rotation: When using a double joint (WX), ensure the following three conditions are met: (a) the angles between the intermediate shaft and the driving/driven shafts are equal; (b) the yoke planes at both ends of the intermediate shaft are aligned; and (c) the intermediate shaft and the driving/driven shafts are in the same plane .

Bearing Selection – Pin/Block vs Needle Roller

The WX/WXD series offers two bearing options:

Bearing Type	Max Speed	Dynamic Load Capacity	Best For
Pin/Block (Sliding)	1000 RPM	Good	Low-speed, high-torque, shock absorption
Needle Roller	4000 RPM	High	High-speed, smooth rotation, precision applications

⚠️ Note: It is recommended to use the coupling at ≤50% of the maximum rated speed for optimal service life .

Model Designation – WX/WXD Series

WXD = Single universal joint
WX = Double universal joint

Bore Type	Designation	Description
Round Hole	Φ	Plain cylindrical hole with taper pin
Keyway	Y	Cylindrical hole with key and set screw
Square Hole	S	Square hole with set screw
Hexagon Hole	F	Hexagon hole with set screw

Marking Example:
WX4–YA16/S18–L130

WX4 = Double universal joint, size 4
Y = Active end with keyway
A16 = Keyway type A, bore 16mm
S18 = Driven end with square hole, 18mm
L130 = Custom installation length

Product Features & Advantages

Advantage	Benefit
40Cr Alloy Steel	High strength, excellent toughness, and fatigue resistance – quenched and tempered for durability
304/316 Stainless Steel Option	Corrosion-resistant – ideal for food & beverage, chemical, and outdoor applications
45° Angle Per Joint	Large angular compensation – accommodates significant misalignment
Double Joint (WX) Capability	Up to 90° total articulation – handles both angular and parallel offset
Synchronous Rotation (WX)	Double joint achieves synchronous rotation with proper phasing
H7 Precision Bore	High concentricity, accurate shaft fit – reduces vibration
Multiple Bore Options	Keyway, hexagon, square – choose your connection type
Two Bearing Options	Pin/block (1000 RPM) or needle roller (4000 RPM)
Multiple Surface Finishes	Black oxide, natural, nickel plated, chrome plated, sandblasted
Large Semi-Finished Stock	Fast delivery for standard and custom orders
JB/T5901-1991 Standard	Manufactured to established Chinese national standard
OEM Customization	Custom bores, materials, and finishes available

Applications

Packaging Machinery – Conveyors, wrapping machines, carton sealers
Woodworking Machinery – Multi-spindle drills, routers, saws
Multi-Spindle Drills – Precision drilling operations
Metallurgical Equipment – Rolling mills, continuous casting lines
CNC Machines – Feed drives, positioning systems
Printing Equipment – Register control, high-speed operation
Textile Machinery – Spinning, weaving equipment
FA Automation – Pick-and-place systems, indexing tables
General Industrial Machinery – Pumps, mixers, conveyors

Why Choose Apex Coupling for WX/WXD Universal Joints?

Advantage	Description
Factory Direct	Competitive B2B pricing – no middlemen
JB/T5901-1991 Standard	Manufactured to established Chinese national standard – quality assured
Premium 40Cr Steel	High strength, toughness, and fatigue resistance
304/316 Stainless Steel Option	Corrosion-resistant for demanding environments
Single or Double Joint	One product family covers all angular and offset needs
Two Bearing Options	Pin/block (1000 RPM) or needle roller (4000 RPM)
H7 Precision Bore	High accuracy, low backlash, reliable operation
Multiple Bore Options	Keyway, hexagon, square – fully customizable
Multiple Finishes	Black oxide, nickel, chrome, sandblasted
Large Semi-Finished Stock	Fast delivery for standard and custom orders
OEM Customization	Custom bores, materials, and finishes available

FAQ

Q: What is the difference between WX and WXD?
A: WXD is a single universal joint – for angular misalignment only. WX is a double universal joint – allows both angular misalignment and parallel offset, with up to 90° total articulation .

Q: What is the maximum operating angle?
A: Each joint can operate up to 45° limit angle. For continuous operation, we recommend ≤30° .

Q: What bearing options are available?
A: Pin/block (sliding) bearing – up to 1000 RPM. Needle roller bearing – up to 4000 RPM .

Q: What is the torque range?
A: The standard series covers 11.2 – 1120 N·m . Custom higher torque is available on request.

Q: What materials are available?
A: Standard is 40Cr alloy steel . We also offer 304 and 316 stainless steel .

Q: What bore types are available?
A: We offer keyway, hexagon hole, square hole, and plain round hole .

Q: What is the bore tolerance?
A: Standard finished bore tolerance is H7 .

Q: What are the common applications?
A: Packaging machinery, woodworking equipment, multi-spindle drills, metallurgy, CNC machines, and general automation .

Q: Can I get a custom coupling?
A: Yes. We offer OEM customization – custom bores, materials, and finishes available .

Q: What is the warranty?
A: 1 Year – quality assured.

Request a Quote

Send us your configuration (WXD single or WX double), bore type, bore size, torque, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.