Pressure ratings · carbon steel · 4:1
Fitting pressure ratings by connection and size. The weaker end always wins.
Maximum working pressure for 10 inch connection types and the three DIN 2353 metric series, in psi and bar. Pick the two ends of a joint below and the calculator names the one that limits it.
About this reference
- Material
- Carbon steel adapters and fittings
- Basis
- 4:1 on minimum burst
- Test
- SAE torque, hardened blocks
- Units
- psi · bar
- Checked
- October 2026
Rate a joint.
Choose the two ends and the size. The joint is rated at the lower of the two, and the panel says which end that is.
Joint working pressure
3,000psi
207 bar
The NPTF end sets the limit.
What the figures assume.
Four conditions sit behind every number on this page. Change any one and the rating changes with it.
4:1 on minimum burst
Each figure is a quarter of the connection’s minimum burst pressure — the same safety factor hydraulic hose is rated to.
Tested at SAE torque
Measured in hardened test blocks at the SAE recommended assembly torque. A joint made up loose or over-tight will not hold it.
Carbon steel only
Stainless steel and brass adapters rate differently, usually lower, and the figures here do not transfer. Ask for the material you are using.
The weaker end governs
An adapter is only as strong as its lower-rated end, and an assembly as its lowest part — the hose included.
Inch connections, carbon steel.
Maximum working pressure in psi, with bar beneath. The last column is two-wire SAE 100R2 hose of the same size — when it is lower than both ends, the hose is the limit, not the fitting. Hose ratings by grade are in hose pressure by size.
| Size | NPTF | NPSM | JIC rigid | JIC swivel | Flareless | ORFS | ORFS adj. | BSP | Code 61 | Code 62 | 100R2 hose ref. |
|---|---|---|---|---|---|---|---|---|---|---|---|
| -21/8" | 5,000345 bar | 5,000345 bar | 5,000345 bar | 5,000345 bar | — | — | — | — | — | — | — |
| -41/4" | 4,000276 bar | 5,000345 bar | 5,000345 bar | 4,500310 bar | 6,000414 bar | 6,000414 bar | 6,000414 bar | 6,500448 bar | — | — | 5,000345 bar |
| -55/16" | — | — | 5,000345 bar | 4,000276 bar | — | 6,000414 bar | 6,000414 bar | — | — | — | 4,250293 bar |
| -63/8" | 3,000207 bar | 4,000276 bar | 5,000345 bar | 4,000276 bar | 6,000414 bar | 6,000414 bar | 6,000414 bar | 5,500379 bar | — | — | 4,000276 bar |
| -81/2" | 3,000207 bar | 3,500241 bar | 4,500310 bar | 4,000276 bar | 6,000414 bar | 6,000414 bar | 6,000414 bar | 4,500310 bar | 5,000345 bar | 6,000414 bar | 3,500241 bar |
| -105/8" | — | — | 3,500241 bar | 3,000207 bar | 5,000345 bar | 6,000414 bar | 6,000414 bar | 4,000276 bar | — | — | 2,750190 bar |
| -123/4" | 2,500172 bar | 2,250155 bar | 3,500241 bar | 3,000207 bar | 4,500310 bar | 6,000414 bar | 6,000414 bar | 3,500241 bar | 5,000345 bar | 6,000414 bar | 2,250155 bar |
| -147/8" | — | — | 3,050210 bar | 2,500172 bar | — | 6,000414 bar | 6,000414 bar | — | — | — | 2,000138 bar |
| -161" | 2,000138 bar | 2,000138 bar | 3,050210 bar | 2,500172 bar | 4,000276 bar | 6,000414 bar | 5,000345 bar | 3,000207 bar | 5,000345 bar | 6,000414 bar | 2,000138 bar |
| -201-1/4" | 1,15079 bar | 1,625112 bar | 2,500172 bar | 2,000138 bar | — | 4,000276 bar | 4,000276 bar | 2,500172 bar | 4,000276 bar | 6,000414 bar | 1,625112 bar |
| -241-1/2" | 1,00069 bar | 1,25086 bar | 2,000138 bar | 1,500103 bar | — | 4,000276 bar | 3,000207 bar | 2,000138 bar | 3,000207 bar | 6,000414 bar | 1,25086 bar |
| -322" | 1,00069 bar | 1,12578 bar | 1,500103 bar | 1,15079 bar | — | — | — | 2,000138 bar | 3,000207 bar | 6,000414 bar | 1,12578 bar |
| -402-1/2" | — | — | — | — | — | — | — | — | 2,500172 bar | — | — |
| -483" | — | — | — | — | — | — | — | — | 2,000138 bar | — | — |
| -563-1/2" | — | — | — | — | — | — | — | — | 50034 bar | — | — |
| -644" | — | — | — | — | — | — | — | — | 50034 bar | — | — |
- NPTFASME B1.20.3 · The lowest-rated end at most sizes, down to 1,000 psi at 1-1/2" and 2".
- NPSMASME B1.20.1 · Seals on a 30° seat. Tracks the two-wire hose rating at every size.
- JIC rigidSAE J514 · Metal-to-metal cone. 5,000 psi to 3/8", then falls steadily with size.
- JIC swivelSAE J514 · A swivel nut or adjustable stud rates below the rigid end from 1/4" up.
- FlarelessSAE J514 · Rated through 1". Depends on the tube wall as much as the fitting.
- ORFSSAE J1453 · 6,000 psi to 1", 4,000 psi above. The usual answer when a joint keeps weeping.
- ORFS adj.SAE J1453 · Matches the rigid end to 7/8", then drops to 3,000 psi at 1-1/2".
- BSPISO 7-1 · ISO 228-1 · From 6,500 psi at 1/4" down to 2,000 psi at 1-1/2" and 2".
- Code 61SAE J518 · ISO 6162-1 · The standard-pressure flange. 500 psi at 3-1/2" and 4".
- Code 62SAE J518 · ISO 6162-2 · 6,000 psi at every size it is made in.
How ratings fall with size.
Six connections on one scale, from -4 to -32. Pipe threads and JIC swivels lose the most; ORFS and the Code 61 flange hold their rating much further. A dash on the baseline means no rating is published at that size.
Dash size
Dash size
Dash size
Dash size
Dash size
Dash size
Metric 24° cone fittings, DIN 2353.
By tube O.D. and series. The same thread can belong to two series at two different ratings — M22×1.5 is a 15 mm light fitting at 3,750 psi and a 14 mm heavy one at 9,450 psi — so always name the series.
| Tube O.D. | LL · extra light | L · light | S · heavy | |||
|---|---|---|---|---|---|---|
| 4 mm | M8×1 | 1,500103 bar | — | — | — | — |
| 6 mm | M10×1 | 1,500103 bar | M12×1.5 | 3,750259 bar | M14×1.5 | 9,450652 bar |
| 8 mm | M12×1 | 1,500103 bar | M14×1.5 | 3,750259 bar | M16×1.5 | 9,450652 bar |
| 10 mm | M14×1 | 1,500103 bar | M16×1.5 | 3,750259 bar | M18×1.5 | 9,450652 bar |
| 12 mm | M16×1 | 1,500103 bar | M18×1.5 | 3,750259 bar | M20×1.5 | 9,450652 bar |
| 14 mm | — | — | — | — | M22×1.5 | 9,450652 bar |
| 15 mm | — | — | M22×1.5 | 3,750259 bar | — | — |
| 16 mm | — | — | — | — | M24×1.5 | 6,000414 bar |
| 18 mm | — | — | M26×1.5 | 2,400165 bar | — | — |
| 20 mm | — | — | — | — | M30×2 | 6,000414 bar |
| 22 mm | — | — | M30×2 | 2,400165 bar | — | — |
| 25 mm | — | — | — | — | M36×2 | 6,000414 bar |
| 28 mm | — | — | M36×2 | 1,500103 bar | — | — |
| 30 mm | — | — | — | — | M42×2 | 3,750259 bar |
| 35 mm | — | — | M45×2 | 1,500103 bar | — | — |
| 38 mm | — | — | — | — | M52×2 | 3,750259 bar |
| 42 mm | — | — | M52×2 | 1,500103 bar | — | — |
Other references
All resources- SAE J514 · J1453 · J518 · ISO 228 · ISO 8434Thread chartMale and female thread diameters, pitch and seat for every common port and connector — measured in inches and millimetres, family by family.Open the thread chart
- Maker’s published settingsCrimp specificationsFinished crimp diameter and die position for each hose and fitting series we supply, with a finder that narrows it to one row.Find a crimp setting
- Written for this siteHydraulic glossaryThe words on a datasheet and at the counter — dash size, drop length, skiving, Code 62 — defined plainly, with what each is confused with.Browse the glossary
Still not sure
If the chart does not settle it, send us the part.
A photograph and two measurements are usually enough for us to name the fitting, the hose or the crimp setting, and quote the replacement the same day.
Or call +971 52 2477942
What to send
- A photo of each end, with a rule or calipers in shot
- The thread O.D. and the pitch, if you have a gauge
- The text printed along the hose
- What it connects to, and the working pressure