Xingtai Boshuo Auto Technology Co., Ltd. is one of the leading manufacturers and suppliers of polyurethane hydraulic rod seal in China. If you're going to wholesale bulk polyurethane hydraulic rod seal made in China, welcome to get pricelist and free sample from our factory. All customized products are with high quality and low price.
Product Description
The Polyurethane Hydraulic Rod Seal is a high performance sealing component designed for reciprocating rod applications in hydraulic cylinders. This Polyurethane Hydraulic Rod Seal features a precision engineered lip profile that provides excellent sealing efficiency under both low and high pressure conditions. It functions as a reliable hydraulic shaft seal and is also suitable for use as an oil seal for hydraulic jack or hydraulic jack oil seal in lifting equipment. Manufactured from premium grade polyurethane material, it offers outstanding wear resistance, extrusion resistance, and dimensional stability. As an effective high temperature shaft seals solution, it maintains sealing integrity in demanding thermal environments, making it ideal for heavy duty hydraulic systems in construction equipment, agricultural machinery, industrial presses, and material handling equipment.
Product Type
Polyurethane oil seals are available in a wide range of profiles to suit different sealing applications.
Common types include:
- UN / UNS / UNP – U-cup seals for rod and piston applications, designed for reciprocating motion in hydraulic cylinders
- UHS – U-cup rod seal with a compact cross section, ideal for high pressure rod sealing
- UHR – U-cup piston seal for heavy duty cylinder applications
- IDU / IDI – Double acting piston seals with excellent sealing performance in both directions
- ODU / OSI – Heavy duty piston seals for large diameter cylinders
- DH / DHS / DKBI – Dust wiper seals for excluding contaminants from hydraulic systems
- PU O-Ring – General purpose static and dynamic sealing
- Backup Rings – Used with O-rings and U-cups to prevent extrusion under high pressure
These profiles are available in various sizes and can be customized for specific cylinder dimensions, offering reliable sealing solutions for construction, agricultural, mining, and industrial hydraulic equipment.
Company Development
Establishment and Early Development (2014–2016)
Founded on May 23, 2014, Xingtai Boshuo Auto Technology Co., Ltd. has quickly built a stable supplier network and gained a foothold in both domestic and international markets. Its early product range included transmission belts and seals such as PK belts, timing belts, toothed belts, wrapped belts, flat belts, oil seals, O-rings, and polyurethane oil seals.
Growth and Expansion (2017–2019)
Rapid growth came through broader product lines, stronger supply chain management, and improved service. Participation in events like the Canton Fair, Agricultural Machinery Exhibition, and Bauma Exhibition raised the company's brand visibility. Export sales grew steadily, leading to successful entry into Southeast Asian and South American markets.
Consolidation and Innovation (2020–2022)
With increased R&D investment, the company introduced new environmentally friendly products and obtained ISO quality management and RoHS certifications. Internal processes were streamlined for greater efficiency, and several high-performance transmission belts were developed to meet the needs of different industries.
Global Expansion and Future Prospects (2023–present)
International expansion continues, with the company taking part in shows such as the Las Vegas Auto Show and Brazil Auto Show. Looking ahead, the focus is on strengthening the brand, growing market presence, and consistently delivering quality products and services.
Our service team
Xingtai Boshuo Auto Technology Co., Ltd. consists of 20 to 99 foreign trade professionals, 80% of whom have formal international trade backgrounds. The team includes dedicated product engineers, quality control specialists, and documentation and logistics specialists. Skilled in multi-channel operations, we offer all-English technical support, drawing analysis, OE model matching, and one-on-one overseas after-sales service. Annual team-building activities and product technical training help us maintain a highly responsive supply chain.
FAQ
Q: If there is oil on the piston rod surface, is it necessary to replace the rod seal immediately?
A: Not necessarily. A layer of moist oil film on the piston rod is a normal lubrication phenomenon. If only a slight oil ring forms and does not drip, it can continue to be used. Once there is obvious dripping or spraying of oil, the machine must be stopped immediately and the seal replaced.
Q: Why do new seals fail so quickly?
A: Common causes include: the sealing lip being cut during installation; incorrect groove dimensions causing the seal to be squeezed out or too tight; impurities such as metal particles in the medium scratching the sealing surface; rust or peeling of the piston rod plating; and incompatibility between the sealing material and the hydraulic oil or operating temperature.
Q: Do the rod seal and dust ring need to be installed close together?
A: Usually, the grooves of the two are separate. An oil drainage circuit should be designed between them to allow the scraped oil film to be discharged in time, avoiding accumulation and damage to the dust ring or rod seal.
Q: Can you provide technical selection guidance?
A: We have professional product engineers who will recommend suitable oil seal materials based on the customer's vehicle model, engine operating conditions, and local oil temperature, and provide installation precautions.
Q:How is the after-sales warranty calculated?
A: Bulk orders come with a 6-12 month warranty; free replacements are provided for damage during transportation or incorrect model shipments; overseas customer feedback is handled in English 24 hours a day.
Q:What is the Minimum Order Quantity (MOQ)?
A: Standard in-stock models have a low MOQ; small-batch trial orders are accepted; custom mold-made models have order quantities negotiated based on production capacity.
Q:What are the most common mistakes when installing piston seals?
A: Forcing the seal past threads or sharp edges scratches the slip ring. Skipping the guide sleeve usually leads to distortion, and damaged O-rings are easily missed. Before installing, deburr the bore, lubricate the seal with clean hydraulic oil, and press it in slowly with a dedicated tool.
Q:How to decide between a PTFE and a PU slip ring seal?
A: PU seals have good elasticity and hydrolysis resistance, but they age quickly under sustained high temperatures or speeds above 0.5 m/s, and their low‑friction behavior is inferior to PTFE. PTFE combination seals handle high-speed, low-speed, and high‑frequency reversing conditions well, and they perform best when very low stick‑slip is required - at a higher cost. In general hydraulic cylinders, a PTFE combination seal is the standard main piston seal; in agricultural and standard machinery, high‑performance PU can reduce cost.
Q: What is the allowable extrusion gap?
A: It depends on pressure and material. Below 40 MPa, a PTFE slip ring with a backup ring can tolerate a single‑sided extrusion gap of about 0.6–0.8 mm. PU seals typically need a tighter gap, around 0.3–0.5 mm. If the actual gap exceeds these values, fit a backup ring.
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