Thread Identifier & Adapter Finder
Select any two thread standards to instantly check compatibility and find the correct adapter. Covers AN/JIC, NPT, BSPP, BSPT, ORB, ORFS, Metric Banjo, and SAE-45 — with safety warnings for dangerous cross-connections.
Any-to-Any Lookup
Select two thread standards and instantly see if they connect directly, need an adapter, or are incompatible.
Safety Warnings
Flags dangerous cross-connections like AN/JIC 37° and SAE 45° that look identical but will fail under pressure.
Thread Explanations
Full description of each thread standard: seal method, origin, and where you'll find it on real cars.
Adapter Recommendations
Named adapter type for every compatible pair — no guessing what to search for when you're at the parts counter.
How to use
Select the thread standard on Side A (e.g. the fitting on your engine), then select the thread standard on Side B (e.g. the hose end or adapter you want to connect). The tool will tell you if they are directly compatible or what adapter is required.
Side A
Select below
Side B
Select below
Quick Compatibility Matrix
Click any combination above for full adapter details.
| Thread | AN/JIC | NPT | NPTF | BSPP | BSPT | ORB | ORFS | Banjo | SAE-45 |
|---|---|---|---|---|---|---|---|---|---|
| AN/JIC | ✓ | ||||||||
| NPT | ✓ | ||||||||
| NPTF | ✓ | ||||||||
| BSPP | ✓ | ||||||||
| BSPT | ✓ | ||||||||
| ORB | ✓ | ||||||||
| ORFS | ✓ | ||||||||
| Banjo | ✓ | ||||||||
| SAE-45 | ✓ |
How to Identify Thread Standards
AN / JIC 37°
Look for a bright, machined 37° cone flare on the end of the hose or fitting. The nut is usually black-anodised aluminium or silver steel. Common sizes: AN-4, AN-6, AN-8 most prevalent in motorsport. Thread is UNF (fine pitch). If it came on an Earls, Goodridge, or Russell fitting — it's AN/JIC.
NPT / NPTF
Tapered pipe thread — the fitting visibly narrows toward the end. Common on US-built engines, oil pans, pumps, and aftermarket oil adapters. Thread pitch is coarser than AN. Always use PTFE tape or Loctite 577 on NPT — bare thread will weep.
BSPP (Japanese / European engines)
Parallel thread with a 55° flank angle. Very common on Honda, Toyota, Nissan, Mazda, and most European OEM fittings. The thread size designation looks like G1/4, G3/8, G1/2 etc. Seals with a bonded washer (Dowty seal) or copper crush washer — not by thread deformation.
ORB (O-Ring Boss)
Identified by the flat machined boss surrounding the port, designed to receive an O-ring. The thread is straight (parallel) and seals via the O-ring — not the threads. You'll see this on Bosch fuel rails, turbo oil inlets, and quality aftermarket manifolds. Never substitute with NPT — the parallel thread will strip.