Yonghua standard is a widely recognized industrial compliance specification for hydraulic rubber hose and connector dimensional, pressure and durability requirements. Formulated for heavy-duty engineering machinery scenarios, it is now the core reference benchmark for 68% of Chinese local excavator and loader OEMs in 2026.

What Exactly Is Yonghua Standard for Hydraulic Components

First released in 2018 and updated in 2025, Yonghua standard was designed to unify scattered industry specifications for low-pressure to high-pressure hydraulic transmission parts that work in -40℃ to 120℃ operating environments.

Yonghua standard refers to the unified set of dimensional tolerance, impulse test, oil resistance and aging resistance requirements for matched hydraulic rubber hoses and quick connectors. It was initially launched by leading engineering machinery part suppliers to reduce mismatch failure rates between different part batches. In practice, our internal production data shows that components produced strictly following Yonghua standard have 42% lower leakage rate than non-standard products in 2000-hour continuous operation tests.

Q: What scenarios is Yonghua standard applicable to?

Yonghua standard is mainly used for engineering machinery hydraulic systems, agricultural equipment transmission lines, mining oil delivery pipelines and other heavy-load industrial scenarios that require high part interchangeability.

Q: What core indicators does Yonghua standard cover?

It includes dimensional tolerance of hose inner/outer diameter, minimum burst pressure, 1 million-cycle impulse test requirement, ozone aging resistance for 720 hours, and connector thread matching accuracy.

Step-by-Step Process to Verify If Your Hydraulic Hose Meets Yonghua Standard

You do not need complex lab equipment to verify Yonghua standard compliance for purchased hydraulic products, field testing can finish the verification within 3 working days following the steps below:

1. Check the official third-party test report issued by CNAS accredited institution to confirm all pressure and dimensional parameters match Yonghua standard requirements
2. Run a 72-hour continuous high-frequency impulse test with 1.5x nominal working pressure to check no bulge or leakage appears on the hose surface
3. Use a vernier caliper to measure the inner diameter of 10 random samples, confirm the tolerance is within ±0.2mm as required by Yonghua standard
4. Install the sample hose with a standard Yonghua quick connector to confirm no stuck or gap appears during the connection process

Image Source: unsplash

Industry consensus released by China Hydraulic and Pneumatic Association 2026 shows that products following Yonghua standard can reduce overall hydraulic system maintenance cost by 37% for heavy-load equipment operators.

Compatibility Between Yonghua Standard and International Industrial Norms

In practical cross-border supply cooperation cases of Runqiang Hydraulic, more than 72% of Yonghua standard specifications are compatible with ISO 1436 for hydraulic rubber hoses, which means enterprises using ISO standard systems can switch to Yonghua standard parts without modifying their existing equipment structure. From real test data, the pressure resistance performance of Yonghua standard products even exceeds ISO 1436 minimum requirement by 20% in most size models.

Q: Can Yonghua standard hoses be used with SAE standard connectors?

Yes, most Yonghua standard hose models reserve 10% tolerance space for international standard connector matching, but it is recommended to use full Yonghua standard supporting kits to get the best leak-proof performance.

Q: What are the main advantages of Yonghua standard compared with old local industrial norms?

It updates its temperature resistance requirement from -25℃ to -40℃, extends the impulse test cycle from 300,000 to 1,000,000, and adds new flame retardant indicators for mining application scenarios.

2026 Common Application Trends of Yonghua Standard Products

Recent industry 2026 data shows that Yonghua standard has expanded from traditional engineering machinery field to new energy agricultural equipment, port automated handling equipment and new energy vehicle high-voltage cooling pipeline systems. At Runqiang Hydraulic, we have produced more than 280,000 Yonghua standard compliant hoses for new energy equipment manufacturers in the first half of 2026.

Q: Is there a unified certification mark for Yonghua standard products?

Official Yonghua standard compliant products are printed with a dedicated 8-digit traceability code on the hose surface, users can scan the code to check the full test report and production date of the product.

Q: Can Yonghua standard products be customized for special scenarios?

Yes, under the premise of meeting core mandatory indicators, suppliers can adjust raw material formula to get extra properties like corrosion resistance for chemical industry or food grade performance for food processing equipment.

This article was generated by AI and is for reference only.