QC Ball Fork Universal Joint Coupling | 30° Angle, Telescopic, H7 Bore

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QC Type Ball Fork Universal Joint Coupling – 30° Angle, Telescopic, 40Cr

Model Number
Check below, custom

QC-06

QC-08

QC-10

QC-12

QC-14

QC-16

QC-18

QC-20

QC-22

QC-25

QC-30

QC-35

QC-40

QC-45

QC-50

QC-60

Product Description

QC Type Ball Fork Universal Joint Coupling – 30° Angle, Telescopic, 40Cr, 6-60mm Bore

The Apexcoupling QC series is a high-performance ball fork universal joint coupling engineered for reliable power transmission in applications requiring both angular misalignment compensation and axial length adjustment. Featuring a ball fork (ball and socket) design with a telescopic spline shaft, this coupling provides smooth, continuous rotation even when the two shafts are not collinear. Manufactured from 40Cr alloy steel with optional 304/316 stainless steel, the QC series delivers high strength, excellent wear resistance, and long service life. With a maximum working angle of 30° (45° limit), H7 finished bore tolerance, and detachable joints for easy maintenance, the QC series is the ideal solution for packaging machinery, woodworking equipment, multi-spindle drills, metallurgical machinery, printing presses, and general automation.

✅ Ball fork design – smooth, continuous rotation with angular misalignment. Telescopic spline – compensates axial displacement without disassembly. 30° working angle – accommodates significant misalignment. Detachable joints – easy maintenance. H7 precision bore – accurate shaft fit. 40Cr alloy steel – high strength and durability. JB/T5901-1991 standard. OEM custom lengths and bores available.

Key Technical Specifications

Parameter	Value
Brand	Apexcoupling
Model Series	QC (Ball Fork Universal Joint)
Also Known As	QC-D, QC-S (detachable types)
Standard	JB/T5901-1991
Type	Ball fork universal joint / cardan shaft
Structure	Ball fork (ball and socket) with telescopic spline
Body Material	40Cr alloy steel (standard); 304/316 stainless steel optional
Surface Treatment	Black oxide, polished, chrome plated, nickel plated, sandblasted
Bore Tolerance	H7
Bore Diameter Range	6 – 60 mm (H7)
Outer Diameter Range	14 – 120 mm
Length Range	36 – 350 mm
Working Angle (Continuous)	30° (recommended)
Limit Angle Per Joint	45°
Telescopic Travel (S)	Customizable – consult specifications
Keyway Option	DIN 6885-1 JS9 (add “K” after bore)
Other Bore Options	Hexagon hole, square hole, pin hole
Heat Treatment	Components hardened for wear resistance
Customization	OEM – custom lengths, bores, keyways, and materials
Applicable Industries	Packaging machinery, woodworking equipment, multi-spindle drills, metallurgy, printing, conveyors, general automation
Place of Origin	Guangdong, China

🔧 Custom lengths, bores, keyways, hexagon/square holes, and special materials (304/316 stainless steel) available. Contact us with your specifications.

QC Series – Model Range & Specifications

Model	d H7 (mm)	D (mm)	L (mm)	L1 (mm)	L2 (mm)	LZmin (mm)	LZmax (mm)	B (mm)	A (mm)	e (mm)	φp (mm)	K (mm)	T (mm)	M
QC-06	6	14	36	9	36	190	230	118	50	4.5	2	3	1	5
QC-08	8	16	42	11	42	194	230	110	50	5.5	2.5	3	1	5
QC-10	10	20	54	13	54	206	221	98	50	6.5	3	4	1.4	5
QC-12	12	25	60	14	60	248	276	128	55	7	4	4	1.8	5
QC-14	14	28	70	17	70	278	308	138	65	8.5	5	4	2.3	6
QC-16	16	32	80	19	80	313	363	153	65	9.5	5	5	2.3	6
QC-18	18	36	90	22	90	360	400	180	70	11	6	5	2.8	6
QC-20	20	40	100	24	100	368	410	168	70	12	6	7.5	2.8	6
QC-22	22	45	110	26	110	384	425	164	70	13	6	7	2.8	6
QC-25	25	50	125	30	125	405	450	155	75	15	8	7	3.3	8
QC-30	30	60	165	43	165	506	555	176	75	21.5	10	7	3.3	8
QC-35	35	70	210	50	210	540	600	120	90	25	10	10	3.3	10
QC-40	40	80	230	60	230	636	696	176	100	30	10	10	3.3	10
QC-45	45	90	260	70	260	712	765	192	100	35	13	12	3.3	10
QC-50	50	100	290	80	290	760	820	240	110	40	–	12	3.8	10
QC-60	60	120	350	100	350	825	890	190	110	50	–	15	4.4	12

📐 LZmin and LZmax represent the minimum and maximum installation lengths with telescopic travel. Custom dimensions available upon request.

Model Designation – QC Series

QC-□□-□□×□□-Lmin/Lmax

Position	Meaning	Example
QC	Series code – Ball Fork Universal Joint	QC
□□	Model number (bore size)	12
□□×□□	Inner Diameter 1 (d1) × Inner Diameter 2 (d2)	12×12
Lmin/Lmax	Installation length range	248/276

Keyway Option: Add “K” after the shaft diameter.

Example: QC-12-12K×12K-248/276 – both bores with keyways

Product Structure

Two Yokes (Forks) – Precision-machined from 40Cr alloy steel with H7 bores.
Ball Fork (Ball and Socket) Joint – Provides smooth, continuous rotation with angular misalignment compensation.
Telescopic Spline Shaft – Allows axial length adjustment (travel S).
Detachable Joints – Easy maintenance and component replacement.
Hardened Components – For wear resistance and long service life.
Bearing Options – Plain bearing (1000 RPM) or needle roller bearing (4000 RPM).

💡 How it works: The QC ball fork universal joint consists of two yokes connected by a ball fork (ball and socket) joint. The ball fork design allows for smooth, continuous rotation even when the two shafts are at an angle. The telescopic spline shaft between the yokes allows axial length adjustment, accommodating variable shaft spacing. The detachable joints make maintenance and component replacement quick and easy. The angle between the two shafts is allowed to change within a limited range (up to 30° working, 45° limit) according to working needs.

Product Features & Advantages

Advantage	Benefit
Ball Fork (Ball and Socket) Design	Smooth, continuous rotation with angular misalignment – reliable torque transmission
Telescopic Spline Shaft	Allows axial length adjustment without disassembly – accommodates variable shaft spacing
30° Working Angle (45° Limit)	Large angular compensation – accommodates significant misalignment
Detachable Joints	Easy maintenance and component replacement – reduces downtime
40Cr Alloy Steel	High strength, excellent toughness, and fatigue resistance
Two Bearing Options	Plain (1000 RPM) or needle roller (4000 RPM) – match your speed requirement
H7 Precision Bore	High concentricity, accurate shaft fit – reduces vibration
Multiple Bore Options	Keyway, hexagon, square, pin hole – choose your connection type
Multiple Material Options	40Cr, 304/316 stainless steel – corrosion resistance
Multiple Surface Finishes	Black oxide, polished, chrome, nickel, sandblasted
JB/T5901-1991 Standard	Manufactured to established Chinese national standard
Compact & Reliable	Simple structure, compact design, high transmission efficiency
OEM Customization	Custom lengths, bores, keyways, and materials

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
Printing Machinery – Register control, high-speed operation
Paper Machinery – Paper production and finishing
Glass Machinery – Glass processing equipment
Food & Beverage Machinery – Hygienic, reliable drives
CNC Machines – Feed drives, positioning systems
General Automation – Pick-and-place systems, indexing tables

Why Choose Apex Coupling for QC Ball Fork 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
Ball Fork Design	Smooth, continuous rotation with angular misalignment
Telescopic Design	Compensates axial displacement – flexible shaft spacing
Detachable Joints	Easy maintenance – reduces downtime
30° Working Angle	Large angular compensation – accommodates significant misalignment
H7 Precision Bore	High accuracy, low backlash, reliable operation
Multiple Bore Options	Keyway, hexagon, square, pin hole – fully customizable
304/316 Stainless Steel Option	Corrosion-resistant for demanding environments
OEM Customization	Custom lengths, bores, keyways, and materials

FAQ

Q: What is a ball fork universal joint?
A: A ball fork universal joint (also called a ball and socket joint) uses a ball fork design to allow smooth, continuous rotation even when the two shafts are at an angle. It provides reliable torque transmission with angular misalignment compensation.

Q: What is the maximum operating angle?
A: Each joint can operate up to 30° working angle for continuous operation. The absolute limit per joint is 45°.

Q: What is the telescopic design?
A: The telescopic spline shaft allows the overall length to be easily adjusted, compensating for axial displacement without disassembly.

Q: What bearing options are available?
A: Plain bearing – max speed 1000 RPM, higher torque. Needle roller bearing – max speed 4000 RPM, lower friction, maintenance-free.

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

Q: What is the bore tolerance?
A: Standard finished bore tolerance is H7 for precision shaft fit.

Q: What bore types are available?
A: We offer keyway (add “K”), hexagon hole, square hole, and pin hole.

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

Q: Are the joints detachable?
A: Yes. The QC series features detachable joints for easy maintenance and component replacement.

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

Request a Quote

Send us your model (e.g., QC-12), bore size, length, travel, bearing type, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.