About Us

Our Story

From Our Family Factory to the World

SEIGO Machinery Equipment Co., Ltd. is a hydraulic cylinder
manufacturer founded in 1995 and headquartered in Zhaoqing, China.
We design and produce heavy-duty hydraulic cylinders for excavators,
bulldozers, wheel loaders, dump trucks, and drill rigs, supplying
mining contractors, construction companies, equipment rental fleets,
distributors, and hydraulic cylinder OEMs across 60+ countries.

Our factory operates at a monthly capacity of 6,000+ units, with
production strictly aligned to ISO 9001:2015 standards. Active
export markets include South Africa, Indonesia, Australia,
Canada, and Russia.

Industry Recognition

Our recognition is built on tangible capacity and precision. We operate a facility capable of producing 6,000+ hydraulic cylinders monthly, serving both domestic OEMs and international markets. We specialize exclusively in heavy-duty cylinders for construction machinery, ensuring that every unit meets the rigorous demands of brands like Komatsu, Hitachi, and CAT. Our automated production lines ensure consistency that small workshops cannot match.

SEIGO manufactures hydraulic cylinders across the following specifications:

– Bore diameter: 40 mm – 600 mm
– Stroke length: 100 mm – 8,000 mm
– Working pressure: up to 40 MPa
– Test pressure: up to 60 MPa
– Rod material: 45# steel, 42CrMo (induction-hardened,
hard chrome-plated ≥ 0.03 mm)
– Barrel material: ST52-2, 27SiMn seamless tubing
– Seal brands: Hallite, NOK, SKF, Parker

Our cylinders serve as OEM-grade aftermarket replacements for Komatsu (PC60–PC8000 series), Hitachi (EX60–EX3600 series), Caterpillar (320–6060 series), Volvo, Doosan, Sany, and XCMG heavy equipment.

Why Choose SEIGO?

✓ Established 1994 — three decades of focused hydraulic cylinder
manufacturing experience, family-owned facility with full
in-house production from raw material to final testing.

✓ ISO 9001:2015 Certified. Every cylinder is built with full material traceability and undergoes 100% pressure testing at 1.5× rated working pressure before
shipment.

✓ Brand Compatibility — direct-fit replacements for Komatsu
(PC200/PC400/PC800/PC1250/PC3000), Hitachi (EX200/EX1200/EX3600),
CAT (320/349/390/6020/6040), Volvo, Doosan, Sany, and XCMG.

✓ Export Experience — actively shipping to mining and construction
operators in Nigeria, South Africa, Indonesia, Australia, Canada,
Russia, Brazil, Chile, and 50+ other countries. FOB, CIF, and
DDP shipping terms supported.

Why We Lead

Premium Material Sourcing

ST52-2 seamless steel tubing for barrels, 42CrMo induction-hardened steel for rods. Hard chrome plating thickness ≥ 0.03 mm with surface roughness Ra ≤ 0.2 μm for extended seal life under mining and construction loads.

Rapid Engineering Response

CAD drawings delivered within 24 hours from your sample or specification. Custom orders from 1 unit (prototype) to 500+ units (bulk OEM). Reverse engineering supported for obsolete or hard-to-source cylinders.

Top-Tier Sealing Systems

Hallite, NOK, SKF, and Parker sealing kits — selected by application: Viton for high-temperature mining operations, polyurethane for standard construction use. Tested to 40 MPa working pressure, 60 MPa burst pressure.

Your Long-Term Supply Partner

Building Stability in Your Supply Chain

SEIGO works with three core partner types:

Distributors and trading companies — wholesale pricing,
white-label packaging available, MOQ from 20 mixed units.
Equipment rental and fleet operators — bulk aftermarket
supply, consolidated shipping, MOQ from 5 units.
Hydraulic cylinder OEMs — contract manufacturing, full
ISO traceability, NDA-protected engineering collaboration.

Standard lead time: 15–30 days for in-stock specifications,
30–60 days for fully custom builds. Third-party inspection welcome at buyer’s request.