China factory Z12 RCK11 KLEE RF19 TLK 451 keyless shaft bonfix locking device shrink disc coupling with high quality best sales price

China factory Z12 RCK11 KLEE RF19 TLK 451 keyless shaft bonfix locking device shrink disc coupling with high quality best sales price

High quality and credit are the bases that make a company alive. a specialised provider of a full range of chains, sprockets, gears, gear racks, V-belts, couplings and reducers, pto shaft, agricultural gearboxes….


Rapid Specifics

Relevant Industries:

Building Materials Stores, Producing Plant, Machinery Mend Shops, Foodstuff & Beverage Manufacturing unit, Retail, Construction works , Energy & Mining

Area of Origin:Zhejiang, China

Straightforward to disassemble, compact design

Item Title:

Z12A Z12B Z12C locking units

Source Capacity

Provide Ability:
one thousand Piece/Pieces per Day

Packaging & Shipping and delivery

Packaging Details
Common ocean deserving bundle

Online Customization

Video clip Description

Solution Description



Z12 locking products/Shrink Disc (JB/T7934-1999)

Keyless locking devices is a new kind of sophisticated mechanical simple elements ,been widely utilised in worldwide to comprehend the transmission of load by way of friction of tightening twelve.nine higher-energy screws.


The main function of locking devices is to substitute the joint operate of the one crucial and the spline to understand the relationship of the mechanical parts (such as gears, flywheels, pulleys, and so forth.) with the shaft to transmit the load.


Positive aspects

locking gadgets have many special advantages more than the standard interference joint and keyed joints:
(one) Use of locking gadgets make the manufacture and installation of the principal parts straightforward. The machining of the shaft and the gap in which locking system is mounted does not call for higher precision manufacturing tolerances like an interference match. There is no require to heat, amazing or pressurize the locking unit, just tighten the bolts to the necessary torque. The hub can be very easily altered to the preferred situation on the shaft. Locking products can also be utilized to join parts with poor weldability.
(2) The locking device has a extended service existence and high toughness. It depends on the friction for transmission, and there is no key groove weakening on the joint member, and there is no relative movement, and no use occurs throughout the perform.
(3) When the locking device is overloaded, it will lose the coupling result and safeguard the products from hurt.
(four) The locking device can bear several masses, and its framework can be created into numerous styles. Based on the measurement of the mounted load, it is also feasible to use multiple locking units in series.
(5) The locking unit is effortless to disassemble and has very good interchangeability. Because the locking device can mix the hubs with massive matching gaps, the bolts can be loosen throughout disassembly, so that the joints can be very easily disassembled. When the expansion is restricted, the speak to area is tightly fitted and is not effortless to result in rust, and easy to be coupled and disassembled.


Software: mining equipment, coal mining equipment, ball mill, belt conveyor, packaging equipment, heavy equipment, mild industrial machinery, food machinery, CNC equipment instruments, metallurgical equipment, textile equipment, printing machinery, plastic equipment, chemical equipment, paper equipment, Marine machinery, tobacco machinery, fans, blowers, reducers, and many others.


Model: Z12A growth sleeve locking device 


 The Z12 expansion sleeve is suited for the coupling of shaft and shaft elements to transmit the merged load of torque and axial force.


Surface area: polished

Substance: 45# steel 

Nominal torque/ rated torque: .84KNm-240KNm 

Gap diameter: 25mm-260mm 

The Z12A type growth joint screw has a mechanical performance rating of 12.9.



Flywheel, cam, tie rod, sprocket, gear, pulley, design equipment, and so on.
How to use: Combine and disassemble according to the technique of utilizing the info website page. When utilizing, generally do not skim. Degreasing could cause a reduction in the transmitted torque, so further care is needed. It can be utilized in numerous phases, but it must be merged according to the restrictions, this kind of as confirming the toughness of the hub and strictly controlling the connection torque. At the identical time, the transmitted torque is not doubled in accordance to the merged quantity. Consequently, you need to have to shell out particular attention.


one, installation:

The enlargement sleeve is greased at the manufacturing facility and can be installed right. When putting in, very first screw 3 bolts four into the screw holes of the flange of the other element one and unfold them evenly all around the circumference to open the inner sleeve 1 and the outer sleeve two. Then area the expansion sleeve into the hub gap of the design and style place and tighten the bolt with the power gauge. The strategy of tightening is to screw each bolt to one/four of the rated torque at a time. The order of tightening is bounded by the slit. The remaining and right cross symmetry is tightened one after the other to make sure that the rated torque worth is attained. 

2. Disassembly:

Loosen all bolts a handful of turns ahead of disassembly. Then screw in the bolt 4 top loose sleeve in the disassembled screw hole. 

three. Protection:

MoS2 oil is strictly prohibited throughout set up to stop contamination of the growth sleeve. On machines with bad open air or doing work setting, rust-evidence grease should be utilized routinely on the uncovered end face and bolts of the growth sleeve. The enlargement sleeve type with much better rust resistance must be picked.

Z12A/B/C locking devices main dimensions for your sort decision.

Pls. order expansion sleeve Z12A=25*55 ,which signifies,model-internal Diam.25mm+outer Diam.55mm




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