In a hydraulic system,Pressure Rating (Pressure Grade) It is a parameter that must not be overlooked when selecting hydraulic fittings.

Many buyers, when requesting quotes, only provide:

1/2" Hydraulic Fitting

However, for hydraulic fittings, size alone does not determine suitability.

A complete pressure match requires simultaneous consideration of:

• Hydraulic Hose Pressure Rating
• Fitting Pressure Rating
• Thread Connection
• Sealing Structure
• Material
• Temperature
• Working Environment

HBFittings' hydraulic fitting product range coversConnection types such as JIC, BSP, BSPT, NPT, etc.and provides reusable hydraulic hose fittings; products can be customized according toSAE 100R2 / 2SN hose, connection type, material grade, and application requirement Make a selection.

The maximum allowable pressure of the hydraulic system depends on the entire hose assembly.Components with the lowest pressure rating, rather than a single component. The SAE J516 standard also explicitly states that the working pressure of a hose assembly must not exceed the lower of the rated pressures of either the hose or the fitting.

1. What Does Hydraulic Fitting Pressure Rating Mean?

Hydraulic Fitting Pressure Rating typically includes:

Working Pressure

Work stress.

Refers to the maximum pressure that a fitting is permitted to withstand under normal continuous operating conditions.

For example:

210 bar working pressure

3000 PSI working pressure

This is the most important reference data for the equipment's long-term operation.

Maximum Pressure

Maximum allowable pressure.

It is typically used for short-term pressure fluctuations.

Burst Pressure

Burst pressure.

Indicates the pressure that the fitting can withstand before failure.

It is not the equipment's operating pressure.

Safety Factor

Safety factor.

Hydraulic products are typically designed with a certain pressure margin.

When making actual purchases, it is not recommended to select a model based on burst pressure.

Correct way:

Working Pressure ≥ System Pressure

Instead of:

Burst Pressure ≥ System Pressure

2. Hydraulic Fitting Pressure Rating Is a System Parameter

A hydraulic hose assembly typically includes:

Hydraulic Hose

↓

Hose Fitting

↓

Adapter

↓

Valve / Pump / Cylinder Port

Any component with insufficient pressure can become a failure point.

For example:

Final system pressure:

≤250 bar

It cannot be used at 300 bar.

SAE J516's requirements for hydraulic hose fittings likewise emphasize that the pressure rating of a hose assembly is determined by the lower of the ratings of the hose and the fitting.

3. Identify Your Hydraulic System Pressure First

Before selecting a hydraulic fitting, you must first verify the system pressure.

Common Information:

Normal operating pressure

Maximum pressure

Pressure spikes

Shock pressure

For example:

Mobile Equipment

For example:

• Excavator
• Loader
• Tractor
• Crane

Usually exists:

• Vibration
• Pressure fluctuation
• Impact load

Dynamic pressure needs to be considered.

Industrial Hydraulic System

For example:

• Hydraulic press
• Injection molding machine
• Automation equipment

Typically, the pressure is more stable, but the operating life is longer.

When making a purchase, don't just tell the supplier:

High pressure system

Suggested to provide:

Working Pressure: 250 bar
Maximum Pressure: 300 bar

4. Pressure Rating of JIC Hydraulic Fittings

JIC is one of the primary connection types in HBFittings' hydraulic product line.

JIC fittings are used:

37° flare sealing structure

And designed in accordance with the SAE J514 standard.

HBFittings' JIC reusable hydraulic hose fittings:

• Stainless steel construction
• SAE 100R2 / 2SN compatible
• Size range 1/4"–1"
• Female swivel options

Applicable to:

• Hydraulic equipment
• Mobile machinery
• Industrial systems

JIC pressure selection requires confirmation:

• Hose size
• Thread size
• Material
• Connection type
• Working pressure

For example:

Error:

Need 1/2" JIC fitting

Correct:

SS316 Female JIC 37° fitting
For SAE 100R2 1/2" hose
Working pressure: XXX bar

5. Pressure Rating of BSP Hydraulic Fittings

The BSP series is also a key product line for HBFittings.

Includes:

• BSPP
• BSPT
• BSP female
• BSP male
• BSP swivel fittings

The pressure rating of a BSP fitting depends on:

• Thread size
• Sealing method
• Material
• Hose compatibility

For example:

BSPP:

• Parallel thread

BSPT:

• Tapered thread

The two cannot be directly substituted simply because they have the same dimensions.

6. Pressure Rating of NPT Hydraulic Fittings

NPT/NPTF is very common in North American equipment.

When selecting an NPT hydraulic fitting, you need to confirm:

• NPT or NPTF
• Thread size
• Material
• Pressure requirement

Note:

NPT ≠ BSPT

Both:

• Thread angle different
• Different pitches
• Sealing design differs.

Cannot be replaced directly.

7. Pressure Rating by Hose Size

In the hydraulic industry, a larger size does not necessarily mean higher pressure.

Stress is usually caused by:

Hose construction

Wire braid layers

Fitting design

Connection size

Impact.

For example:

SAE 100R2:

Two wire braid hose

Designed for medium/high pressure hydraulic applications

HBFittings reusable fittings are primarily designed for:

SAE 100R2 / 2SN hose

Perform matching.

8. Single Wire vs Two Wire Hose Pressure Matching

Hydraulic hose reinforcement affects the overall pressure rating.

Common:

SAE 100R1

Single wire braid

Suitable for:

Medium pressure applications

SAE 100R2 / 2SN

Two wire braid

Suitable for:

Higher pressure hydraulic systems

SAE 100R16

Compact high pressure hose

Suitable for:

Limited installation space

Fitting must match hose construction.

Cannot:

High-pressure hose + low-grade fitting

9. Working Pressure vs Dynamic Pressure

Hydraulic equipment does not maintain stable pressure across all operating conditions.

For example:

• Excavator operation:
• Cylinder extension
• Valve switching
• Load impact

Pressure changes will occur.

Therefore:

Static system:

Working pressure = operating pressure

Dynamic system:

Needs to be considered:

• Pressure spikes
• Vibration
• Impulse cycles

Mobile devices require particular attention:

• Swivel fitting
• Elbow fitting
• Hose routing

10. Pressure Selection for Mobile Equipment

Materials also affect long-term pressure stability.

HBFittings offers:

• Carbon Steel
• Brass
• SS304
• SS316
• SS316L

Among them, stainless steel reusable fittings are mainly used for:

• Corrosive environment
• Marine application
• Industrial systems

When selecting materials, the following should be considered:

12. Temperature Effect on Pressure Rating

The pressure rating is not fixed.

Increased temperature may affect:

• Seal performance
• Hose strength
• Material properties

Confirmation required:

• Minimum temperature
• Maximum temperature
• Hydraulic fluid temperature

For example:

Normal environment:

20–40°C

High-temperature equipment:

80–120°C

The materials and seal need to be reconfirmed.

13. Pressure Rating of Reusable Hydraulic Fittings

Key features of HBFittings' reusable hydraulic hose fittings:

• Field installation
• No crimping machine required
• Suitable for maintenance applications

However, the pressure rating of a reusable fitting must be determined based on:

• Hose type
• Fitting design
• Size
• Material

Confirmed.

Cannot because:

Same thread size

Just think:

Same pressure rating

14. Pressure Testing of Hydraulic Fittings

When making bulk purchases, you may request:

• Pressure test report
• Material certificate
• Inspection report

HBFittings Product Data Support:

• Material certificates
• Pressure certificates

Applicable to:

• Engineering projects
• OEM equipment
• Marine systems
• Industrial applications

15. Common Pressure Selection Mistakes

Mistake 1

Only view Thread Size

Error:

1/2" fitting

Correct:

1/2" hose + JIC + pressure requirement

Mistake 2

Only view Hose Pressure

Error:

Hose can handle 300 bar

So "fitting" is fine too.

Actual:

The fitting may only be rated for 250 bar.

Mistake 3

Ignore Temperature

High-temperature environments may reduce the actual operating pressure.

Mistake 4

Ignore Vibration

Mobile devices need to account for dynamic pressure.

16. Hydraulic Fittings Pressure Selection Checklist

17. Example Selection

Example 1

Customer Requirements:

Excavator hydraulic hose fitting

Parameters:

Hose: SAE 100R2

Size: 1/2"

Connection: JIC Female

Material: SS316

Pressure: 250 bar

Select direction:

SS316 Female JIC 37° Reusable Hydraulic Hose Fitting

Example 2

Customer Requirements:

Industrial hydraulic pipeline fitting

Parameters:

Pressure: 300 bar

Port: BSP

Environment: Factory

Selection:

BSP hydraulic fitting

Correct sealing method

Suitable material

Pressure certificate

18. Information Required for HBFittings Quotation

Purchase inquiry suggestions should include:

Hose Information

• Hose standard
• Hose size
• Hose model

Connection

JIC / BSP / NPT

Male / Female

Swivel / Fixed

Pressure

• Working pressure
• Maximum pressure

Environment

• Temperature
• Fluid
• Corrosion condition

Material

Carbon steel

Brass

SS304

SS316

SS316L

Documents

Drawing

Material certificate

Pressure certificate

19. HBFittings Hydraulic Fittings Pressure Selection Logic

HBFittings' pressure selection logic can be summarized as follows:

Application

↓

System Pressure

↓

Hydraulic Hose

↓

Connection Type

(JIC / BSP / BSPT / NPT)

↓

Fitting Size

↓

Material

↓

Temperature & Fluid

↓

Pressure Certificate

↓

Final Hydraulic Fitting Selection

For hydraulic fittings, the correct model is determined not by a single dimension, but by the overall system conditions.

HBFittings offers tailored connection solutions for various pressure ratings and application environments, featuring JIC, BSP, BSPT, NPT series, as well as SAE 100R2 / 2SN reusable hose fittings.