Application
Excavator hydraulic pump drive, rotary drilling rig, wheel loader,
mining auxiliary equipment, heavy-duty industrial hydraulic power
unit.
This 50A hexagonal flexible coupling bushing adopts upgraded
modified NBR elastomer, different from conventional general-purpose
50A rubber coupling. Optimized NBR compound greatly improves
oil-resistance and anti-fatigue performance for heavy-duty working
scenarios. The special hexagonal elastic structure evenly
distributes torsional load, absorbs start-stop shock and torsional
vibration, compensates shaft misalignment effectively. It helps to
extend service life of connected hydraulic pump and engine
components. Zero lubrication requirement lowers daily maintenance
cost for construction fleets.
Full Related Coupling Series
4A, 4AS, 8A, 8AS, 16A, 16AS, 22A, 22AS, 25A, 25AS, 28A, 28AS, 30A,
30AS, 50A, 50AC, 50AS, 80A, 80AS, 90A, 90AS, 140A, 140AS
Frequently Asked Questions
Q1: What is the difference between this 50A hexagonal NBR coupling
bushing and ordinary standard 50A rubber coupling?
A1: Our product uses specially modified heavy-duty NBR compound
instead of general-purpose rubber. It delivers lower compression
set, better oil-resistance and anti-ozone aging performance. The
optimized hexagonal geometry disperses torsional stress evenly,
reduces local tearing risk under frequent shock load. It can resist
hydraulic oil splashing on construction sites and extend service
life under heavy cyclic impact, solving common early-failure issues
of ordinary rubber couplings such as swelling, cracking and
permanent deformation.
Q2: What machines can this 50A hexagon coupling element fit for?
A2: It is widely used for excavator hydraulic pump drive, rotary
drilling rigs, wheel loaders, bulldozers, mining auxiliary
machinery and heavy-duty industrial hydraulic power units. It is a
direct replacement for original 50A coupling for Komatsu, Hitachi,
CAT, Hyundai, Kobelco and other mainstream construction machinery
brands.
Q3: Do I need modification when installing this hexagonal coupling
bushing?
A3: No modification is required. Strictly manufactured per original
50A dimension standard. Customers can directly replace old coupling
element, quick field maintenance without special custom machining.
Q4: What are working temperature and torque parameters for this NBR
hexagonal coupling bushing?
A4: Working temperature ranges from -30℃ to +110℃, adapts for cold
winter and high-temperature continuous-running construction
conditions. Nominal torque reaches 850Nm, maximum surge torque up
to 2200Nm, maximum rotational speed 3800 Min-1, stable performance
under frequent start-stop heavy-impact operation.
Q5: Do you accept small trial orders for repair shops?
A5: Yes, MOQ is 2 sets. Small trial orders are supported for
machinery repair shops and retail buyers. We also provide volume
discount for large wholesale orders from construction spare-parts
distributors.
Q6: What about delivery time and available shipping options?
A6: In-stock goods can be dispatched within 1-2 working days after
payment. Bulk custom orders take 15-30 working days. Global
shipping options are available: sea freight for large-volume goods;
DHL, FEDEX, EMS air express for urgent maintenance orders.
Q7: What payment methods do you accept for overseas customers?
A7: We accept multiple cross-border payment options including
Western Union, Cash, Bank Transfer, PayPal, HSBC and CITY BANK
international transfers to satisfy global dealers' demands.
Q8: What maintenance work does this hexagonal flexible coupling
bushing require during service?
A8: It is maintenance-free design, no grease or lubricant needed.
Just regularly check for surface crack or deformation during
routine equipment inspection. It helps reduce daily fleet
maintenance cost for construction machinery.
Q9: How do you control product quality and guarantee after-sales
support?
A9: Every batch undergoes strict dimension inspection, NBR hardness
test and surface visual screening before shipment. We provide fast
technical support within 24 hours if customers face installation
trouble or quality doubts. We actively collect site feedback and
offer practical troubleshooting advice for coupling-related
transmission failure.
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