AN Hoses, Fittings & Adapters
In AN Hoses, Fittings & Adapters you can build AN/JIC 37° plumbing for oil, fuel and cooling circuits, from hose ends to transitions and routing parts. To get started quickly, open AN-6 Hoses, Fittings & Hose Ends, Threaded Adapters & Unions (AN/JIC, NPT, Metric) and Aluminium Hardline Hoses & Fittings. Always confirm thread and sealing type on the product page before matching parts. Add what you need to your basket and place your order.
AN Hoses, Fittings & Adapters – service-friendly oil/fuel/coolant plumbing with predictable sealing and tidy routing
When you want a clean, maintainable plumbing layout, AN parts make it easier to build a system that can be assembled, inspected and serviced without stressing the hose or fighting inaccessible joints. With AN/JIC 37° connections the goal is consistent, repeatable sealing, which is especially useful on oil cooler runs, custom fuel lines and high-heat engine bay routing. Quick warning: near-match threads can screw together yet still seal incorrectly if the standards do not match.
Across this category you will typically combine hose ends, unions, bulkhead pass-throughs, reducers and closures (for example a blanking plug) to fine-tune the route. A reliable setup comes down to three checks: the right size (e.g., AN-6 to AN-12), the correct sealing method, and a route that accounts for heat, movement and tool access.
Technical Basics
AN/JIC 37° joints seal on the cone/seat interface, while the thread provides clamping, so clean, undamaged sealing faces are essential, especially on AN-8 and larger connections. 37° flare parts are not interchangeable with 45° flare systems, so confirm where the joint seals (flare seat, washer, O-ring seat or tapered thread) before ordering. Quick warning: do not apply sealant to flare sealing faces.
Hose construction also matters: braided rubber hose and PTFE inner hose require different hose ends and assembly methods, so treat the listed compatibility as decisive. With rigid tube routing (hardline), a tube nut and sleeve retain the tube end and help create a neat, fixed route. Quick warning: if a hose is twisted at the fitting, sealing and service life can suffer.
Selection Criteria
Start sizing from the job: oil cooler circuit, fuel feed/return, venting or coolant routing. For compact lines, AN-4 Hoses, Fittings & Hose Ends can be a sensible starting point, while higher-flow sections often lead you to AN-8 Hoses, Fittings & Hose Ends. Quick warning: do not force routing by bending the hose at the fitting—solve it with the right angle and proper support.
If you are building larger-bore fuel or oil runs, check AN-10 Hoses, Fittings & Hose Ends and AN-12 Hoses, Fittings & Hose Ends for the typical high-flow geometries and matching parts. Consider heat exposure, abrasion points and spanner clearance so you can assemble and re-check joints later. Quick warning: if threads do not start smoothly by hand, stop and verify the standard.
Installation & Maintenance
Assembly quality is mostly cleanliness and alignment: keep debris out of the hose, protect 37° sealing faces from scratches, and start threads by hand to avoid cross-threading. For safety-critical hydraulics (brake/clutch), ensure the fitting type and sealing method are correct for the application, and begin with AN-3 Brake & Clutch Hoses, Fittings & Hose Ends. Quick warning: any dampness in a brake fluid circuit needs immediate investigation.
Before regular use, perform a staged pressure test, then re-check after the first heat cycle because interfaces can settle slightly. Support the route with clamps/line separators so vibration does not load the fitting, and add abrasion or heat protection where needed. Quick warning: fuel smell, visible dampness or oil misting should be treated as urgent.
FAQ
How does AN/JIC 37° sealing work?
AN/JIC 37° joints seal on the flare cone/seat, not on the thread. That is why clean, undamaged sealing faces are essential. If the seat is scratched, the joint can weep even when tightened correctly.
Which AN size should I choose for a fuel feed/return?
There is no single answer: it depends on required flow, system pressure and packaging. Start by identifying the port standards and the purpose of each run (feed, return, vent), then select the size and geometry accordingly. Use the product specifications as the final check.
Do AN fittings need thread sealant?
Usually not for 37° flare joints, because the cone is the sealing surface. Sealant may be appropriate only where the product specifies it for tapered threads. Applying sealant to flare faces can prevent proper seating and cause leaks.
Hardline vs braided hose: which is better?
Hardline is useful when you want a fixed, very tidy route with minimal movement, while braided hose offers flexibility and easier routing around components. Both require proper support and protection from heat and sharp edges. Choose based on packaging and service access.
How do I know if a hose end is for PTFE or rubber hose?
A hose end is designed for a specific hose construction and assembly method, so the product listing compatibility is decisive. PTFE hoses often require different internal features than rubber hoses. If you are unsure, match hose and fittings within the stated manufacturer pairing.
Confirm size and sealing method, then order the AN parts you need to complete your routing.
