Connection: G1/2 x 6, 8, 10, 12mm
PN in bar: 100,400
Material: Steel

Datasheet

Gauge Process Fittings – Leak-tight, Secure, Service-Friendly

Gauge process fittings connect pressure gauges to the process reliably—available as straight, elbow and tee fittings, reducers, union/screw fittings, and compression/cutting-ring solutions. They ensure the correct thread standard, a medium- and temperature-appropriate seal, and a stable, low-vibration mechanical connection.

Available in zinc-plated carbon steel and stainless steel 304/316(L), for G 1/4 / G 1/2 (BSPP), 1/4″ / 1/2″ NPT, M20×1.5, as well as DIN 2353 tube fittings (L/S series) and JIC 37° (SAE J514). ICS Schneider Messtechnik can supply pre-assembled sets incl. valve, snubber/siphon, fitting and gauge—with EN 10204 3.1 on request.

FAQ on Gauge Process Fittings

Selection, standards, sealing concepts, pressure ratings, installation and best practices—at a glance.

Which fitting types are common?

Type	Function	Typical use
Straight / elbow / tee	Direction/branch adaptation	Tight spaces, viewing position
Union / screw fitting	Quick separation for service	Calibration, device exchange
Compression / cutting ring (DIN 2353)	Metal-to-metal tube seal	Hydraulics/process, high strength
JIC 37° (SAE J514)	37° flare cone seal	International, vibration-resistant
Adapter / reducer	Change thread/size	G↔NPT↔metric, port matching

What thread standards and sealing principles are used?

Thread	Standard	Sealing	Note
G 1/4, G 1/2 (BSPP)	ISO 228 (parallel)	Flat gasket/O-ring at seat	Faces flat, burr-free
1/4″, 1/2″ NPT	ASME B1.20.1 (taper)	PTFE tape or paste	Wrap in screw direction
M20×1.5	ISO metric	Usually flat gasket	Verify matching seat
DIN 2353	ISO 8434-1	Metal (cutting ring) + O-ring (ED type)	Observe L/S series
JIC 37°	SAE J514	Metallic 37° cone	Highly serviceable

How do I choose the right pressure rating?

Size for max operating pressure + safety margin. For DIN 2353 tube fittings: use the L series for standard pressures, S series for higher pressures. Consider temperature, medium and wall thickness; comply with PED/ASME where applicable.

Carbon steel or stainless—what’s appropriate?

Zinc-plated steel for neutral media in standard environments. 316(L) for corrosive media/environments, food/pharma, or elevated temperatures. Select seals (PTFE, FKM, EPDM, FFKM) according to medium and temperature.

Do fittings affect measurement quality?

Long/narrow passages slightly increase response time and damp pulsations. For fast processes, choose short fittings with larger bores; optionally add a snubber.

Key installation tips

Clean threads/cone faces; apply the correct sealing concept (BSPP/NPT/metric).
Mount stress-free; avoid lever forces on the gauge.
Use torque per manufacturer; for cutting rings perform correct pre-assembly.
Align elbows/tees to the reading direction before final tightening.

How to pre-assemble cutting rings (DIN 2353) correctly?

Cut tube square, deburr, clean.
Slide nut and ring on; insert tube to stop in the body.
Turn per datasheet for pre-assembly; inspect ring bite.
Final assembly at the measuring point with reduced torque.

Which DIN 2353 sizes are common?

Series	Tubing OD	Typical use
L (Light)	6 / 8 / 10 / 12 / 15 / 18 / 22 / 28 mm	General machinery/plant
S (Heavy)	6 / 8 / 10 / 12 / 16 / 20 / 25 / 30 / 38 mm	Higher pressure/rough duty

Typical mistakes—and how to avoid them

Mixing thread standards → leakage / damage.
Over-tightened NPT joints → cracks/distortion.
No proper cutting-ring pre-assembly → ring slips, leaks.
Too many adapter chains → dead space, vibration, load on instrument.

Can I combine fittings with other accessories?

Yes. Proven stack: Process → shut-off valve/gauge cock → fitting/adapter → optional snubber/siphon/cooling element → gauge/diaphragm seal.

Use in hazardous (Ex) areas?

Mechanical fittings are usually uncritical. With electrical components (contact gauges), observe the Ex approval of the complete assembly and ensure bonding.