How to Match Crimp Fittings with R1AT and R2AT Hose Assemblies

To match a crimp fitting with an R1AT or R2AT hose, confirm that the hose size, fitting insert, ferrule, and crimp specification are approved as one compatible assembly system. R1AT hose has one steel-wire braid reinforcement, while R2AT has two; that difference does not mean their fittings are automatically interchangeable. Select components using the hose and fitting manufacturer’s compatibility information, then crimp to the specified finished diameter. Before production, verify the connection type, working pressure, fluid, temperature, and routing requirements.

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Key Takeaways

• Match the fitting and ferrule to the exact hose type and nominal size, not just to a similar-looking hose.
• Use the crimp diameter and tooling specified for the selected hose-and-fitting combination; do not estimate or reuse settings from another system.
• Check the complete assembly’s pressure, fluid, temperature, connection, and installation requirements before ordering or crimping.
• Ask your supplier to confirm compatibility when the hose and fittings come from different manufacturers.

Understand the Hose and Fitting Combination

What R1AT and R2AT Mean for Selection

R1AT and R2AT are hydraulic hose designations commonly associated with hose constructions described in SAE 100R1AT and SAE 100R2AT. In general terms, R1AT uses one steel-wire braid and R2AT uses two. These constructions can have different outside diameters and assembly requirements, so the same ferrule or crimp setting should not be assumed to suit both.

A crimp fitting assembly typically consists of a hose tail or insert, a ferrule or socket, and the hose. The fitting insert enters the hose bore, while the ferrule is crimped around the hose and insert to secure the connection. Compatibility depends on the dimensions and design of all three components, as well as the crimping process.

Do Not Select by Appearance Alone

Two fittings may look alike but differ in insert profile, ferrule dimensions, material, or intended hose compatibility. A fitting that enters the hose is not necessarily safe or suitable for crimping. Use the supplier’s product codes and compatibility charts to verify the exact combination.

Step-by-Step Matching Process

1. Identify the Exact Hose Specification and Size

Read the hose marking and confirm its type, nominal size, pressure rating, and manufacturer where available. Match the fitting to the hose’s nominal size and verify that the fitting insert is designed for that hose construction. For example, -04 and -08 commonly indicate nominal sizes of 1/4 in and 1/2 in respectively, but the dash size alone does not confirm fitting compatibility.

Also check the hose outside diameter against the fitting system’s stated requirements. Differences in outside diameter can affect ferrule fit and the finished crimp, even when two hoses share a nominal inside diameter.

2. Select a Fitting and Ferrule Approved for That Hose

Choose a fitting series explicitly identified for R1AT or R2AT of the required size. Confirm whether the fitting uses a separate ferrule or another retention design, and follow the system’s assembly instructions. If your hose supplier and fitting supplier are different, request written confirmation of the pairing rather than relying on a general description such as “two-wire hose fitting.”

3. Match the End Connection to the Equipment

Identify the equipment-side connection before ordering the fitting. Options may include straight or angled configurations and different thread, flange, or other connection standards. Check the thread form, size, sealing method, and orientation against the port or mating component; similar thread diameters do not guarantee the same connection standard.

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For an angled fitting, specify the required orientation as well as the connection type. A 90-degree elbow, for example, must be positioned so the hose can follow its intended route without twisting. Confirm the required orientation with a drawing or assembly instruction where position is critical.

4. Confirm Operating Conditions for the Complete Assembly

Check that the hose and fitting assembly is suitable for the system’s maximum working pressure, fluid, and operating temperature. Use the rating for the assembled combination where the manufacturer provides one; do not treat the hose’s rating alone as the rating of every selected fitting. Consider pressure surges, external exposure, and installation conditions if they apply to the application.

5. Crimp to the Published Assembly Specification

Use the specified crimping machine, dies, insertion depth, and finished crimp diameter for the exact hose, fitting, and ferrule combination. Measure the completed crimp at the points and with the method described by the supplier. Do not substitute a setting from another hose size or infer the target diameter from the ferrule’s appearance.

Inspect the assembly for correct hose insertion, ferrule position, fitting orientation, and visible damage. If the supplier specifies a verification or testing procedure, follow it and retain the assembly details for traceability.

Important Decision Points

Common Matching Mistakes to Avoid

• Using one fitting series for both hose types without confirmation: Similar reinforcement descriptions do not prove that the insert and ferrule are interchangeable.
• Choosing by nominal size only: Verify both the hose size and the fitting system’s dimensional requirements.
• Reusing an old crimp setting: A setting suitable for one hose, ferrule, or fitting combination may be unsuitable for another.
• Ignoring the connection standard: Check the mating port and sealing method, not just the apparent thread size.
• Overlooking routing and bend requirements: Plan the assembly path to avoid twisting, kinking, or loading the fitting during installation.

How to Improve Sourcing and Assembly Results

Before requesting a quotation, prepare a clear specification that lists the hose type, size, length, fitting end connections, orientation, operating conditions, and required quantity. Add a drawing or sample when the geometry or orientation is difficult to describe. This information helps a supplier identify missing details before production begins.

For repeat orders, keep approved part numbers and crimp instructions together with the assembly drawing. If you change the hose brand, fitting series, ferrule, or crimping equipment, recheck compatibility instead of assuming the original settings still apply. Ask the supplier what inspection records or assembly documentation are available for the order.

Supplier Support for R1AT and R2AT Assemblies

At Hengshui Xinchi Hose Manufacturing Co., Ltd., we support buyers sourcing rubber hose products and related assembly components by reviewing the information provided for hose type, size, fitting ends, and application. We can help clarify what details are needed to evaluate a proposed R1AT or R2AT fitting match. Final selection and crimping should always follow the confirmed component specifications and the applicable assembly instructions.

Conclusion: Match the Complete System, Not Just the Fitting

To match crimp fittings with R1AT and R2AT hose assemblies, first identify the exact hose construction and size, then select a compatible fitting and ferrule, confirm the equipment connection, and crimp to the published specification. The key practical difference is that R1AT has one wire braid and R2AT has two, but reinforcement count alone is not enough to determine fitting compatibility. Before placing an order, send your supplier the hose marking, dimensions, connection details, operating conditions, and any required orientation. Contact Hengshui Xinchi Hose Manufacturing Co., Ltd. with these details to discuss a suitable sourcing and assembly approach.