Hydraulic Compression Fittings are used primarily for joining and sealing fluid or pneumatic lines. This page summarizes where they fit, the industries that rely on them, and the practical points to get right when you specify them — to DIN 2353. Stocked across roughly M4 to M42, they cover general to heavy-duty work.
Typical Applications for Hydraulic Compression Fittings
The most common settings where these are specified:
- General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.
- Maintenance & repair (MRO): a stocked size for servicing existing plant where the original fastener spec must be matched.
- Fabrication & metalwork: bench and on-site assembly of steel frames, enclosures and weldments.
- Pneumatic systems: connecting air lines, cylinders and valves on automation rigs.
- Hydraulic & fluid power: sealed, pressure-rated joints in fluid lines.
How to Specify Hydraulic Compression Fittings for Your Application
- Size: Match the nominal size to the mating thread or hole. This product spans M4–M42; check the full table below for the exact dimensions of each size.
- Thread & pressure: Match the thread form (BSP/NPT/metric) and pressure rating to the line, and seal appropriately (tape, sealant or O-ring).
- Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
- Standard: This product is supplied to DIN 2353. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.
Where Hydraulic Compression Fittings Are Not the Right Choice
Do not mix thread forms (BSP into NPT) without an adapter, and do not exceed the pressure rating of the lowest-rated component.