FAQ
1. What does Yingnaisi do?
Yingnaisi Hydraulic is supplier of high quality hydraulic products including Hydraulic cylinders and parts.
2. What certificate do you have?
All our factories are ISO certificated. And our main suppliers of materials and parts are with CE, RoHs, CSA and UL certificates.
3. How long is your delivery time?
The delivery time depends on different products and quantity. The cylinder usually needs about 45-60 days.
4. Could Yingnaisi produce parts as customers’ requirement or drawing?
Yes, we can OEM for you as your drawings. Our engineer also can give you profesional support for technical suggestions.
5. What kind of payment terms do you accept?
We prefer T/T through bank. 30% when order is confirmed and 70% before shipment.L/C is also acceptable for amount over 20,000USD.
6. What is your warranty policy?
All our products are warranted for one full year from date of delivery against defects in materials and workmanship. this warranty
does not cover parts that are worn out through the course of normal operation or are damaged through negligence. we serious remind
that unclean hydraulic oil will definitely cause damage to your hydraulic components. and this damage is not included in the
warranty range. so we strongly suggest you to use new clean oil or make sure the system oil are clean when using our parts.
7. What kinds of cylinders do you usually make?
We have a professional design team,we can make almost every conventional cylinders. such as tie-rod cylinders. welded cylinders.
piston cylinders, plunger cylinders, telescopic cylinders, double rod cylinders, rephrasing hydraulic cylinders, high pressure
cylinders, stainless steel cylinders, aluminum alloy cylinders, electrical hydraulic cylinders, and other special cylinders.
8. What materials are you using for cylinders?
Usually we use 45# steel for cylinder barrel, rod ,cap and cylinder end, ductile iron for piston, 20# steel are also used in some
cylinders for easily welded. the rod is hardened and chrome plated. nitrogen or QPQ rod (black rod) can also be supplied as
customer’requirements.
9. Which brands of seal kit can you use?
* our standard seal kit is our OEM brand in China. we can also use the famous brands as customer's required, such as PARKER,
HERCULES, HALLITE , NOK DICHTOMATIK, ETC.
10. Will you test all your cylinders before delivery?
* we test each cylinder before delivery. the testing pressure is usually 2times of the rated pressure.