During the procurement process for hydraulic fittings,Material (materials) It's not just the price.

Many customers, when requesting a quote for the first time, will pay attention to:

• Size
• Thread
• Pressure
• Quantity

However, in practical applications, one of the key factors determining the service life of hydraulic fittings is material selection.

The requirements for materials vary significantly depending on the application environment:

Construction machinery places greater emphasis on strength and cost;

Marine equipment places greater emphasis on resistance to salt-spray corrosion;

Chemical equipment places greater emphasis on material compatibility;

Food, medical, and clean applications place greater emphasis on surface cleanliness.

HBFittings' reusable hydraulic hose fittings are primarily made ofSS304, SS316, SS316L stainless steel, supportJIC, BSP, BSPT, NPT Connection method, compatible withSAE 100R2 / 2SN hydraulic hoseand supports material certificates and pressure certificates.

Therefore, Hydraulic Fittings Material Selection requires comprehensive consideration of:

Pressure + Fluid + Temperature + Corrosion + Application Environment

1. Why Hydraulic Fitting Material Matters

Hydraulic fittings serve three functions in the system:

1. Hold Pressure

Withstand hydraulic system pressure.

For example:

• Hydraulic oil pressure
• Pressure spikes
• Mechanical vibration

2. Resist Corrosion

Resistance:

• Water
• Salt spray
• Chemicals
• Humidity

3. Maintain Connection Reliability

Material influence:

• Thread strength
• Sealing performance
• Fatigue resistance
• Service life

If the wrong material is selected, even if the dimensions and thread are perfectly correct, the following may occur:

• Leakage
• Thread damage
• Corrosion
• Cracking
• Unexpected replacement

2. Common Hydraulic Fitting Materials

Common materials for hydraulic fittings include:

HBFittings currently focuses on stainless steel hydraulic fittings, manufactured from SS304, SS316, and SS316L materials, and designed for high-pressure hydraulic hose systems.

3. Stainless Steel Hydraulic Fittings

SS316 / SS316L Hydraulic Fittings

SS316 is an important material choice among HBFittings' reusable hydraulic fittings.

Product Features:

• Stainless steel body
• High corrosion resistance
• Suitable for harsh environments
• Compatible with SAE 100R2 / 2SN hose
• Available in JIC, BSP, BSPT, NPT connections

Advantages of SS316

1. Excellent Corrosion Resistance

Applicable to:

• Marine environment
• Salt water
• Coastal areas
• Chemical atmosphere

For example:

Marine hydraulic system:

Plain carbon steel may require additional protection, whereas SS316 offers superior long-term corrosion resistance.

2. Better Chloride Resistance

SS316 contains molybdenum, and compared to SS304:

It has stronger pitting resistance;

More suitable for saline environments.

3. No Plating Layer

Carbon steel typically relies on surface treatments to prevent rust.

SS316:

• Does not rely on electroplated layers;
• Surface stability;
• It requires low long-term maintenance.

Typical SS316 Applications

4. SS304 Hydraulic Fittings

SS304 is another common stainless steel material.

Compared to SS316:

Advantages:

• Lower cost;
• Good processability;
• Generally resistant to corrosion in ambient environments.

Suitable for:

• Outdoor machinery
• General industrial equipment
• Clean hydraulic systems

SS304 vs SS316

For standard outdoor equipment:

SS304 is usually sufficient.

For:

• Marine
• Offshore
• Chemical

SS316 is given priority.

5. Carbon Steel Hydraulic Fittings

Carbon steel is one of the most common materials used in industrial hydraulic systems.

Key advantages:

High Strength

Suitable for:

High pressure hydraulic systems

Heavy machinery

Cost Effective

Compared to stainless steel:

Material cost lower;

Large quantity procurement advantage obvious.

Good Machinability

Suitable for mass production:

• JIC fittings
• BSP fittings
• NPT adapters

Typical Applications

Limitations

The Biggest Problem With Carbon Steel:

Corrosion resistance

Not suitable:

Saltwater

Chemical exposure

Long-term outdoor without protection

Usually required:

Zinc plating

Surface coating

Enhance corrosion resistance.

6. Brass Hydraulic Fittings

Brass has:

• Good machinability
• Good corrosion resistance
• Easy processing

Commonly used for:

• Pneumatic systems
• Low pressure applications
• Water applications

Brass Advantages

Easy Machining

Suitable for:

• Small fittings
• Precision components

Good Corrosion Resistance

For:

• Air
• Water

It has good performance.

Brass Limitations

Not suitable:

• Very high pressure hydraulic systems
• Heavy impact applications

If the system:

• 300 bar+
• Mobile hydraulic equipment
• Shock load

Steel or stainless steel is usually given priority.

7. Material Selection Based on Application

Construction Machinery

For example:

• Excavator
• Loader
• Crane

Recommendation:

Carbon Steel

Reason:

• High strength
• Cost effective
• Suitable for hydraulic oil

If the environment is harsh:

Choose SS316.

Marine Equipment

For example:

• Boat hydraulic system
• Offshore equipment

Recommendation:

SS316 / SS316L

Reason:

• Saltwater resistance
• Better chloride resistance

Agricultural Machinery

For example:

• Tractor
• Harvester

Recommendation:

• Carbon steel
• SS304

Depends on:

• Outdoor exposure
• Maintenance frequency

Chemical Equipment

Recommendation:

SS316L

Reason:

• Better corrosion resistance
• Better chemical compatibility

8. Material Selection Based on Hydraulic Fluid

Different media impose different requirements on materials.

When making a purchase, do not only provide:

Hydraulic fitting

It should be noted:

Media: Hydraulic oil

Or:

Media: Sea water

9. Material Selection Based on Temperature

 

Temperature can affect:

• Material strength
• Seal performance
• Pressure capability

Confirmation required:

• Working temperature
• Peak temperature

For example:

Ordinary industrial environment: 20–80℃

High-temperature equipment: 100°C+

Needs to be reconfirmed:

• Material grade
• Seal material
• Pressure derating

10. Stainless Steel Grade Selection Guide

Choose SS304 When:

Applicable to:

• General outdoor use
• Clean industrial environment
• Cost-sensitive projects

Choose SS316 When:

Applicable to:

• Marine
• Salt spray
• Chemical environment
• High corrosion requirement

Choose SS316L When:

Applicable to:

• Chemical processing
• High purity applications
• Long service life requirement

HBFittings reusable fittings are available in SS304, SS316, and SS316L options and come with material certification documents.

11. Material and Pressure Relationship

Material selection cannot be divorced from pressure.

For example:

High-pressure system:

It is necessary to confirm simultaneously:

• Material
• Size
• Thread
• Hose type
• Pressure rating

HBFittings stainless steel reusable fittings are designed for high-pressure hydraulic systems and are matched according to hose type, connection, and size.

12. Material and Connection Type

Material selection must also take into account the connection.

HBFittings offers:

• JIC
• BSP
• BSPT
• NPT

Connection method.

For example:

SS316 + JIC

Suitable for:

• Marine hydraulic system
• Mobile equipment

SS316 + NPT/BSPT

Suitable for:

• Industrial pipeline connection

13. Common Material Selection Mistakes

Mistake 1

Just look at the price.

Error:

Carbon steel cheaper, choose it everywhere.

Actual:

The marine environment may cause premature corrosion.

Mistake 2

All stainless steels are the same.

Error:

Stainless steel is enough.

Actual:

SS304 and SS316 are used in different environments.

Mistake 3

Ignore the medium.

Error:

Only consider pressure.

Actual:

Chemical compatibility is equally important.

Mistake 4

Ignore authentication requirements.

Engineering projects may require:

Material certificate

Pressure certificate

HBFittings product support includes relevant materials and pressure certification documents.

14. Hydraulic Fittings Material Selection Table

15. Material Selection Checklist for Buyers

When purchasing hydraulic fittings, the following must be provided:

Application

• Construction
• Marine
• Industrial
• Agriculture

Working Condition

• Pressure
• Temperature
• Fluid

Material Requirement

• Carbon Steel
• SS304
• SS316
• SS316L
• Brass

Connection

• JIC
• BSP
• BSPT
• NPT

Documents

• Material Certificate
• Pressure Certificate
• Inspection Report

16. How to Choose Hydraulic Fittings Material from HBFittings

The material selection logic of HBFittings can be summarized as follows:

Application

↓

Pressure Requirement

↓

Hydraulic Fluid

↓

Temperature

↓

Corrosion Environment

↓

Material Selection

↓

Connection Type

(JIC / BSP / BSPT / NPT)

↓

Final Hydraulic Fitting

For standard hydraulic equipment:

Selection:

Carbon Steel

For long-term outdoor use:

Selection:

SS304

For marine, salt spray, and chemical environments:

Selection:

SS316 / SS316L

HBFittings' current range of reusable hydraulic fittings is primarily manufactured from SS304, SS316, and SS316L materials, and accommodates JIC, BSP, BSPT, and NPT connections. These fittings are suitable for SAE 100R2 / 2SN hydraulic hose systems.