How to Match Crimp Fittings with R1AT and R2AT Hose Assemblies

To match a crimp fitting with an R1AT or R2AT hose, confirm the hose’s construction and size, then select a fitting series specifically approved for that hose and its crimp specifications. R1AT typically has 1 steel-wire braid, while R2AT typically has 2 steel-wire braids; that difference affects the fitting’s compatibility and the assembly’s required crimp dimensions. Matching by hose diameter alone is not enough. Always verify the hose and fitting manufacturer’s compatibility information before production or installation.

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Quick Summary

• Confirm the hose type, nominal size, and applicable manufacturer specification before choosing a fitting.
• Use a fitting and ferrule combination approved for that exact hose construction and size.
• Check the fitting end connection, material, orientation, operating conditions, and crimp instructions.
• Do not assume R1AT and R2AT fittings are interchangeable, even when the hoses share a nominal size.

Why Hose and Fitting Compatibility Matters

A crimp fitting creates a mechanical connection by compressing its ferrule around the hose. The fitting stem, ferrule, hose cover, and reinforcement must work together as a specified assembly. If parts are mismatched, the finished connection may not achieve the intended retention or sealing performance.

R1AT and R2AT hoses are commonly associated with EN 853 1SN and 2SN constructions, respectively, but product naming and compatibility should be confirmed against the actual manufacturer’s documentation. The reinforcement distinction is important: R2AT’s two wire braids do not automatically mean that an R1AT fitting can be used with it. Crimping dimensions and compatible components depend on the hose and fitting series, not only on the general hose type.

Step-by-Step Matching Process

1. Identify the Exact Hose Construction and Size

Start with the hose marking, product datasheet, or purchase specification. Record the hose type, nominal bore, manufacturer, and any product series or standard designation shown. If the marking is missing or unclear, ask the hose supplier to identify the product rather than relying on appearance alone.

Nominal size is often shown using dash notation. For example, a nominal -06 size commonly corresponds to 3/8 in, or about 9.5 mm, while -08 commonly corresponds to 1/2 in, or about 12.7 mm. These are nominal size references, not a substitute for checking the hose’s actual product dimensions or the fitting manufacturer’s size chart.

2. Select a Fitting Series Approved for That Hose

Choose a fitting series that the manufacturer identifies as compatible with the exact R1AT or R2AT hose model and size. The fitting stem and ferrule are designed as a combination, so do not substitute a ferrule or stem simply because the parts appear to fit. Where a supplier offers a hose-and-fitting compatibility chart, use the listed pairing and crimp specification.

Some suppliers provide fittings for multiple hose constructions, while others specify different series for different hoses. The product code alone may not make that distinction clear. Ask the supplier to confirm the complete combination in writing when the catalog information is incomplete.

3. Match the End Connection to the Equipment

After confirming hose compatibility, select the fitting’s equipment-side connection. Check the thread or connection standard, size, sealing method, and gender required by the port or mating component. A fitting can be compatible with the hose and still be wrong for the equipment connection.

Also choose the fitting form required by the routing: for example, a straight fitting or an angled fitting. If the assembly must clear nearby components, confirm the angle and orientation on the drawing before ordering. Do not use force to make a mismatched thread or sealing face connect.

4. Confirm Operating Conditions and Materials

Check the assembly against the application’s pressure, temperature, fluid, and environmental requirements using the hose and fitting manufacturers’ published limits. The allowable working conditions belong to the finished assembly and may be limited by its lowest-rated component. Do not assume a hose rating alone establishes the rating of the complete hose assembly.

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Consider fitting material and surface finish in relation to the fluid and surrounding environment. If the application involves unusual fluids, elevated temperatures, outdoor exposure, or corrosive conditions, provide those details to the supplier so material suitability can be reviewed. Avoid selecting materials based only on appearance or price.

5. Follow the Specified Crimp Dimensions

Use the crimp diameter and assembly instructions published for the exact hose, fitting, and ferrule combination. Crimp dimensions are product-specific; a universal crimp measurement should not be applied across different manufacturers or series. Confirm the required assembly method, tooling, and inspection procedure with the supplier or equipment documentation.

Before making multiple assemblies, verify the setup using the manufacturer’s stated process. Record the component codes and crimp specification used so that repeat orders can be checked against the same approved configuration. If the hose or fitting series changes, recheck compatibility rather than carrying over an earlier setup automatically.

Key Decision Points at a Glance

Common Matching Mistakes to Avoid

Assuming the Same Nominal Size Means the Same Fitting

Two hoses with the same nominal bore can have different constructions or fitting requirements. Confirm the hose series and manufacturer compatibility, not just the dash size. Likewise, a fitting that fits one brand’s hose should not be presumed compatible with another brand’s product without confirmation.

Mixing Components or Guessing the Crimp

Combining a stem from one fitting series with a ferrule from another can create an unverified assembly. Guessing the crimp dimension or copying a setting from a different hose can also lead to an assembly outside the specified process. Use the documented component pairing and instructions for the exact product.

Ignoring the Application and Installation

A correctly matched hose-end connection can still be unsuitable if the fitting does not mate with the equipment port or the routing puts the assembly under avoidable strain. Check end connections, fitting angle, available clearance, and operating conditions before placing an order. Share installation drawings or photographs when they help explain the requirement.

How to Make Sourcing More Efficient

When requesting a quotation, provide the hose type and size, fitting end details, required quantity, operating conditions, and any drawing or existing part number. Include the required hose and fitting brand if the application calls for a specific approved combination. This information helps a supplier identify gaps before confirming a product selection.

For repeat or custom requirements, ask for the proposed hose, fitting, ferrule, and crimp specification to be listed together on the quotation or product documentation. Confirm whether samples, drawings, or pre-production checks are needed for your process. These steps support clearer purchasing and reduce the risk of ordering a component that is only a partial match.

Conclusion: Match the Complete Assembly, Not Just the Hose Size

The reliable way to match crimp fittings with R1AT and R2AT hose assemblies is to identify the exact hose construction and size, select a manufacturer-approved fitting and ferrule combination, and follow its published crimp instructions. R1AT’s typical single-braid construction and R2AT’s typical two-braid construction are useful identification points, but they do not replace product-specific compatibility checks. The fitting’s equipment connection and the application’s operating conditions must also be confirmed.

Before ordering, send your supplier the hose marking or datasheet, nominal size, fitting-end requirements, and application details. XINCHI can review these specifications as part of a B2B product inquiry and help clarify the information needed to select a suitable rubber hose and fitting solution. Request confirmation of the proposed component combination and assembly requirements before production.