About Us
ABOUT POWERTRANS
Wuxi Zejia Technology Co., Ltd.
We are an ISO 9001:2015 certified manufacturer of cardan shafts, universal joints and couplings. Fifteen-plus years in driveline production, customers in more than 30 countries, and one working assumption: in the plants we supply, downtime is measured in lost tonnes, not minutes.
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ISO 9001:2015
Certified manufacturer
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15+ years
Driveline production
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30+ countries
Served to date
01 / QUALITY
Every batch leaves with its own paperwork
Documentation is part of the delivery, not something requested afterwards. Traceability runs from the raw material through machining and heat treatment to the packed shipment, and inspection records cover 100% of factory output.
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Material certificates
Each shipment carries material certificates that tie the finished parts back to the raw material batch they were produced from.
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Dimensional inspection records
Bore, flange, spline, keyway and length measurements are recorded batch by batch before packing.
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Hardness reports
Heat treatment results are measured and filed with the same batch paperwork, so hardness can be checked years after delivery.
02 / PRODUCT CAPABILITY
Shafts and couplings, standard or built to drawing
The range covers universal joint shafts, cardan shafts and the couplings that connect them — supplied as standard series or made to a customer drawing, including drop-in replacements for imported drives.
03 / WHERE THEY RUN
Heavy-duty drives, continuous duty
These are installations where a failed shaft stops the line and the cost is counted in production lost, not in the price of the part.
Steel rolling mills · mining and crushing · lifting and conveying · marine propulsion · construction machinery · paper and cement plants
04 / ENGINEERING BASIS
Materials, splines and balance
Material and heat treatment are selected per application — torque, speed, misalignment, environment and duty cycle — and specified on the drawing before production starts.
- MATERIALS
- 6061-T6 aluminium, 40Cr, 42CrMo, 20CrMnTi, GCr15 bearing steel, 304 stainless — matched to load and operating environment.
- KEYWAYS AND SPLINES
- GB/T 1095 keyways, GB/T 1144 straight-sided splines, GB/T 3478 involute splines.
- BALANCING
- Dynamically balanced to ISO 1940-1, grade G6.3, for high-speed shaft assemblies.
- HEAT TREATMENT
- Quench and temper for 40Cr and 42CrMo, carburizing for 20CrMnTi, through-hardening for GCr15; working-surface hardness is specified in HRC on the drawing and confirmed by the hardness report shipped with the batch.
Send us your drawing — get a quote in 48 hours
Shaft length, bore and flange dimensions, spline or keyway data, torque and speed, and the duty cycle are enough for us to come back with a drawing-based quotation.
TRUST & CREDENTIALS
Certified manufacturing, on the record
What we can evidence today: an ISO 9001:2015 certified manufacturing operation, more than fifteen years of driveline production, customers in 30+ countries, and a documented inspection trail on every batch that ships.
Certifications
Held by the manufacturing operation, with the product scope it covers.
- Quality management
- ISO 9001:2015 certified manufacturer
- Scope of supply
- Cardan shafts, universal joints and couplings
- Documents with every batch
- Material certificates, dimensional inspection records, hardness reports
Track record
Where the shafts and couplings we build are in service today.
- Experience
- 15+ years building driveline components
- Export coverage
- Customers in 30+ countries
- Heavy-duty sectors
- Steel rolling, mining and crushing, lifting and conveying, marine propulsion, construction machinery, paper and cement
- Replacement fit
- GWB / GNK / Voith / ELBE series cardan shafts
Manufacturing quality
How a batch is controlled from incoming material to the packed shipment.
- Traceability
- Raw material to shipment, batch by batch
- Inspection coverage
- 100% factory inspection traceability
- Materials
- 6061-T6, 40Cr, 42CrMo, 20CrMnTi, GCr15, 304
- Keyways and splines
- GB/T 1095, GB/T 1144, GB/T 3478
- Balancing
- ISO 1940-1, grade G6.3
- Heat treatment and hardness
- Quench and temper for 40Cr and 42CrMo, carburizing for 20CrMnTi, through-hardening for GCr15; working-surface hardness specified in HRC on the drawing