Metric Pipe Connection Fittings
Nuts, nipples, bulkhead, tee, swivel, elbow, welded, gauge fittings and plugs.
26 products · 474 variants
What are metric pipe connection fittings?
Metric pipe fittings are the DIN 2353 cutting-ring system that connects steel hydraulic tube to other tube and to equipment. As the nut is tightened, the ring bites into the tube, providing both grip and sealing; the seal is made on the 24° cone face. Two pressure classes exist: light (L) and heavy (S) series.
Metric Nut
L- and S-type compression nuts for metric pipe fittings.
Details & Table → Cutting Ring (Ferrule)
Cutting ring (ferrule) providing the seal in metric pipe connections.
Details & Table →
Metric Bulkhead Nipple
L- and S-type nipple joining two metric pipes.
Details & Table → BSP to Metric Nipple (O-ring)
O-ring nipple transitioning from BSP pipe thread to metric (L and S type).
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BSP to Metric Reverse Nipple
Reverse nipple transitioning from BSP to metric thread (L and S type).
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Metric Reducing Fitting
Reducing fitting connecting different metric sizes (L and S type).
Details & Table → Metric Nutted Reverse Fitting
Reverse fitting with metric nuts on both ends (L and S type).
Details & Table → Metric Block - Metric Cone Fitting
Metric cone block fitting connecting different metric threads.
Details & Table → Metric Cone / Reducing Nipple
Cone reducing nipple connecting different metric sizes.
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Bulkhead Nipple
Bulkhead pass-through nipple for panels (L and S type).
Details & Table → Bulkhead Elbow
Bulkhead 90° elbow for panel pass-throughs (L and S type).
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Metric Tee
Three-way metric tee fitting (L and S type).
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Metric Adjustable Swivel Elbow
Angle-adjustable metric swivel elbow fitting (L and S type).
Details & Table → Metric Branch Tee
Side-branch metric tee fitting (L and S type).
Details & Table → Metric Run Tee
Center-branch metric run tee fitting (L and S type).
Details & Table → Metric Reverse Elbow
90° metric reverse (female) elbow fitting (L and S type).
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Metric Elbow
90° metric elbow fitting (L and S type).
Details & Table → NPT - Metric Male Threaded Elbow
Male threaded elbow transitioning from NPT/pipe thread to metric (L and S type).
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Weld-on Metric Male Fitting
Weld-on metric male threaded fitting (L and S type).
Details & Table → Weld-on Metric Elbow
Weld-on 90° metric elbow fitting (L and S type).
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Gauge Male Outlet Fitting
Male-outlet fitting for pressure gauge connections.
Details & Table → Gauge Reverse Fitting
Reverse (female-outlet) fitting for gauge connections.
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Plug - Metric Allen Head
Allen (hex socket) head plug for closing unused metric ports.
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Plug - Metric Hex Head
Hex (wrench) head plug for closing unused metric ports.
Details & Table → Cap - Metric Nutted Blind
Metric female (nutted) blind cap closing a line end (L and S type).
Details & Table → Plug - Metric Male Blind
Metric male blind plug closing a female port (L and S type).
Details & Table →What to look for
- Series: L or S
- The L (light) series works at 160–315 bar, the S (heavy) series at 400–630 bar. For the same tube diameter the two series have different thread sizes and cannot be mixed.
- Tube outside diameter
- In the metric system the size refers to the tube outside diameter (Ø6, Ø8, Ø10, Ø12…). The fitting is selected to this; wall thickness sets the pressure class.
- Assembly sequence
- Slide the nut and cutting ring onto the tube, seat the tube fully against the stop, then tighten by the number of turns given in the catalogue. Under-tightening leaks; over-tightening deforms the ring.
- Body type
- Union, elbow, tee, swivel, bulkhead, welded and plug bodies are chosen to suit the line geometry. Separate gauge-port bodies are available for pressure gauges.
Frequently asked
Can L and S series be mixed?
No. For the same tube diameter the thread size and cone geometry differ between L and S. Forced assembly will not seal and the connection can blow out under pressure.
Can a cutting ring be reused?
A ring already bitten into a tube may be refitted to that same tube end, but never to a different tube. Deformed or cracked rings must always be replaced.
Can I fit a metric fitting to a BSP thread?
No. Metric threads are 60° and BSP 55°, with different pitches. Use an adapter nipple to move between standards.