JIC Hydraulic Fittings Manufacturer in China

Supply JIC 37° flare hose fittings and adapters for distributors, hose shops, OEMs, and repeat purchasing programs. Available in straight, elbow, tee, bulkhead, and conversion configurations.

▷ JIC 37° Flare & SAE J514 Options

▷ Mixed-SKU Supply

▷ Carbon steel, stainless steel, and brass

▷ OEM drawings, samples, and custom packaging

Product List

TOPA supplies JIC 37° flare hydraulic fittings for distributors, hose assembly businesses, OEMs, importers, and industrial buyers. Our range includes straight, 45°, 90°, tee, bulkhead, hose-end, adapter, and conversion configurations in carbon steel, stainless steel, and brass.

For purchasing evaluation, please provide your part numbers, thread sizes, fitting configurations, required quantities, and application requirements. SKU lists, drawings, or reference samples can also be reviewed when specification confirmation is required.

Products Video

In this video, we introduce TOPA’s range of JIC hydraulic fittings, including straight, elbow, tee, bulkhead, and conversion configurations. These fittings are available in multiple sizes and materials to support hydraulic distributors, hose shops, OEMs, and industrial purchasing programs.

JIC fittings use a 37° flare sealing interface with straight threads to create a secure metal-to-metal connection when correctly matched and assembled. Different configurations are available for hose assemblies, adapters, equipment ports, and mixed-thread hydraulic systems.

If you are sourcing JIC fittings for regular replenishment, mixed-SKU orders, OEM production, or custom requirements, send us your part numbers, quantities, drawings, or specifications for evaluation.

Application

Topa’s JIC hydraulic fittings are widely used across multiple industries thanks to their reliable 37° flare sealing, broad size range, and strong compatibility with hydraulic hoses. Available in carbon steel and brass, with stainless steel options for corrosive environments, these fittings are built to handle fluid transfer in demanding conditions. They are commonly applied in construction equipment, aerial lifts, heavy machinery, engine systems, and agricultural equipment where stable performance and leak-free connections are required.

Need to Verify JIC Fittings Before a Larger Order?

For qualified distributor, OEM, private-label, and repeat purchasing projects, specifications and sample requirements can be reviewed before mass production.

All You Need to Know About Hydraulic JIC Fittings

Working Principle

JIC hydraulic fittings use a 37° flare sealing structure combined with straight threads to create a stable, high-pressure connection. During installation, the 37° flare surface contacts the matching seat, forming a tight metal-to-metal seal that helps prevent fluid leakage.

This design makes JIC fittings suitable for high-flow and high-pressure hydraulic systems, especially in equipment exposed to continuous movement and harsh working conditions.

To support different system requirements, JIC fittings can be combined with multiple connection standards, including SAE straight thread O-ring Boss (ORB), NPTF, BSPP-ED, BSPP-O-ring Retaining Ring (ORR), BSPP, BSPT, ISO 6149, as well as metric options such as Metric-ORR and Metric-ED. This allows easier integration into international hydraulic systems and reduces compatibility issues during replacement or OEM assembly.

Materials

JIC hydraulic fittings are made from high-quality materials designed to withstand demanding hydraulic systems and harsh environments. The common materials used are:

Steel – Provides excellent strength and durability, making it ideal for high-pressure applications. Steel fittings are often coated with corrosion-resistant layers for additional protection.

Stainless Steel – Offers superior corrosion resistance, making it perfect for use in environments exposed to moisture, chemicals, and extreme temperatures. Stainless steel fittings are often preferred in industries like food processing, pharmaceuticals, and marine applications.

Brass – Known for its ease of machining and resistance to corrosion, brass fittings are ideal for moderate-pressure systems and environments where strength requirements are lower compared to steel or stainless steel.

JIC Fitting Design & Sealing Structure

The typical JIC fitting features the following key structural components:

37° Flare – The 37° mating surfaces create the primary metal-to-metal seal when the connection is correctly matched, clean, undamaged, and assembled according to the appropriate requirements.

Straight UN/UNF Threads – The straight threads provide the mechanical clamping force that holds the mating 37° flare surfaces together. In a standard JIC flare connection, the threads themselves are not the primary sealing surface.

Locknut and Port Stud (for Adjustable Ports) – The locknut helps secure the fitting in place, while the port stud holds the fitting to the port. Some designs feature a longer locknut for improved stability and reduced potential for washer damage.

Common JIC Fitting Problems and Solutions

Avoid costly mistakes in hydraulic fitting selection. These common problems often lead to leakage, installation failure, and repeated purchasing errors. Each solution helps you reduce risk and improve system reliability.

Leakage After Installation

Even correct-looking fittings may leak due to wrong flare angle or damaged sealing surface.

Solution: Confirm 37° flare and sealing seat before ordering. Topa checks sealing surfaces to reduce leakage risk.

Thread Mismatch

JIC, NPT, BSP, and metric threads are often confused, causing installation failure.

Solution: Verify thread type and pitch. Topa supports matching by drawing or sample.

Wrong Size or Configuration

Incorrect size or structure leads to repeated installation attempts and delays.

Solution: Confirm size and type in advance. Topa helps verify specs before production.

Loosening Under Vibration

Continuous vibration in heavy machinery can cause fittings to loosen over time.

Solution: Use correct torque and fitting design. Topa fittings support stable connections.

Corrosion in Harsh Environments

Standard fittings may rust quickly in outdoor or chemical environments.

Solution: Choose proper material and coating. Topa offers stainless steel options.

Inconsistent Bulk Quality

Bulk orders may vary in size and sealing performance, affecting assembly.

Solution: Focus on inspection and consistency. Topa controls dimensions before shipment.

Planning a JIC Fitting Purchase?

Send your part numbers, fitting configurations, quantities, material requirements, and purchasing frequency. We can review your specifications and prepare a supply proposal based on your actual requirements.

How to Customize JIC Fittings with Topa

Get the right JIC hydraulic fittings without mismatch or delays. Topa helps you confirm specifications, reduce errors, and move from idea to production faster.

Step 1

Submit Purchasing Requirements

Share your drawing, sample, or photo. Include thread type, size, and application if available.

Step 2

Specification Confirmation

We verify thread, flare angle, size, and structure to avoid mismatch and installation issues.

Step 3

Supply Proposal & Quotation

After specification review, we confirm available options, quantities, material, customization requirements, expected lead time, and quotation.

Step 4

Sample or Production

For qualified projects, pre-production samples can be arranged when dimensional, fitting, marking, or assembly verification is required before volume production.

Step 5

Quality Inspection

Each batch is checked for thread accuracy, dimension, and sealing performance before shipment.

Step 6

Packing and Delivery

Export packing protects fittings during transport and keeps threads and surfaces in good condition.

Hydraulic JIC Fittings Manufacturing Process

At Topa, we employ advanced CNC machining to produce our Hydraulic JIC fittings with precision. The manufacturing process includes raw material selection, CNC turning and milling, threading, and final quality inspection. Each fitting undergoes stringent testing for dimensional accuracy and pressure tolerance. Once finished, the fittings are carefully cleaned and prepared for shipping.

Material Selection

Depending on the application, materials such as steel, stainless steel, or brass are chosen. The raw materials are then cut to the required lengths and prepared for machining.

CNC Machining

The prepared material is then fed into CNC machines, which precisely cut and shape the fittings to the desired dimensions.

Flare Formation

The JIC sealing geometry is machined and controlled to achieve the required 37° sealing surface and dimensional specifications.

Surface Treatment

Common treatments include galvanizing (zinc coating) or applying plating for steel fittings. Stainless steel fittings may receive coatings to prevent galling.

Assembly

Once the fittings are coated and treated, they are assembled with additional components if necessary, such as O-rings, seals, or locknuts.

Packaging and Shipping

Custom packaging options are available for clients who require branded or specific packaging solutions.

Quality Check

Each hydraulic fitting is checked through a series of inspection and testing procedures to ensure consistent performance, reliable sealing, and long service life in hydraulic systems.

Hardness Testing

Material hardness is tested to ensure the fitting has the required strength and durability. Proper hardness helps prevent deformation, cracking, or failure under high-pressure working conditions.

Surface Roughness Testing

Surface roughness is inspected to ensure proper sealing performance. A controlled surface finish helps reduce leakage risks and improves connection reliability.

Profile Inspection

Profile testing is used to verify the shape and angle of threads and sealing surfaces. This ensures that each fitting matches standard specifications such as JIC, BSP, or ORFS connections.

Salt Spray Testing

Salt spray testing evaluates corrosion resistance of the plated surface. This helps ensure the fittings can perform reliably in humid, outdoor, or harsh operating environments.

FAQ

What is JIC hydraulic fttings?

JIC hydraulic fittings have a 37° cone seat on the female fitting and a 37° flare on the male fitting. Common in hydraulic systems. for conveying fluids.

What does JIC mean in hydraulic fittings?

JIC refers to a hydraulic fitting system commonly associated with the SAE J514 37° flare connection. It combines straight UN/UNF threads with a 37° metal-to-metal sealing surface.

How to measure JIC hydraulic fittings?

First measure the thread using a thread gauge. Only if the JIC thread gauge fits tightly into the fitting you have in your hand will this indicate a JIC thread.

Use calipers to measure the inner and outer diameter of the threads. You can check Topa’s datasheet for fit measurements.

What is the difference between JIC and SAE hydraulic fittings?

JIC commonly refers to the SAE J514 37° flare fitting design. “SAE fitting” is a broader term that can refer to several hydraulic connection standards, including JIC 37° flare, SAE O-ring Boss, and other SAE-defined interfaces. Therefore, the exact connection standard should always be confirmed rather than identifying a fitting only as “SAE.”

Is JIC and NPT hydraulic fittings the same?

No. JIC connections normally use straight UN/UNF threads and a 37° flare sealing surface. NPT connections use tapered pipe threads and typically rely on thread interference together with an appropriate sealing method. They differ in thread geometry and sealing principle and should not be interchanged.

What pressure can JIC hydraulic fittings handle?

There is no single pressure rating for all JIC fittings. Working pressure depends on fitting size, material, design, tube or hose connection, temperature, and manufacturer specifications. Always verify the rated pressure of the specific fitting and complete assembly before use.

Do JIC fittings require thread sealant?

Standard JIC 37° flare connections normally do not require thread sealant because sealing occurs at the mating 37° flare surfaces rather than at the threads. If a JIC adapter includes another connection type, such as NPT, the sealing requirements of that specific end must be followed.

Can JIC hydraulic fittings be used on hydraulics?

JIC fittings are ideal for hydraulic applications. Widely used in the market. Metal-to-metal seal for high and low temperature fluids.

What is the difference between AN and JIC hydraulic fittings?

AN and JIC connections both use a 37° flare concept, but they are governed by different specifications and may have differences in tolerances, materials, and application requirements. Do not assume interchangeability solely from the flare angle; verify the applicable standard and dimensions first.

What is the difference between JIC and JIS hydraulic fittings?

JIC commonly uses a 37° flare sealing interface, while JIS hydraulic fittings can use different sealing geometries depending on the specific JIS standard and connection type. Thread size and appearance alone are not enough to confirm interchangeability.