Straight Union - Stainless Steel Compression Fitting for plastic and metal tubings.

Metric and Imperial sizes available (see Size Chart). Our fittings are compatible with other brands such as Swagelok and Parker. Please see our catalog for other types of fittings.

Specifications Body Material 316 Stainless Steel Nut (NTC) is Silver Plated Back Ferrule (BFC) is surface hardened Operating Temperature -425°F to 600°F (-253°C to 315°C) Compatibility Swagelok®, Parker A-Lok, Let-Lock, Yor-Lock Service Steam, Air, Water Oil, Gasoline, Natural Gas Most solvents and acids that are compatible with 316SS Pressure Tube (OD) Maximum Pressure (PSI at 72°F) 1/16" 10,000 1/8" 2mm 8,800 3/16" 4mm 5,500 1/4" 6mm 4,200 5/16" 8mm 3,300 3/8" 10mm 2,800 1/2" 12mm 2,500 5/8" 16mm 2,300 3/4" 18mm 2,100 1" 20mm 1,900 Strength Testing In the strength test, STC Fittings out performed Tubes, where Tubes failed before STC Fittings when pressures were raised beyond the recommended Maximum Pressure.

Dimensions Tube Size (OD) Part No. A B C D E F G 1/16" SUC 1/16 25.1 17.5 8.6 10 10 1 1.59 1/8" SUC 1/8 35.6 22.4 12.7 10 10 2 3.18 3/16" SUC 3/16 37.3 24.1 13.7 12 12 3 4.76 1/4" SUC 1/4 40.9 26.2 15.2 12 14 4 6.35 5/16" SUC 5/16 43.2 28.2 16.2 14 17 6 7.94 3/8" SUC 3/8 45.0 30.2 16.8 17 17 7 9.53 1/2" SUC 1/2 51.3 31.0 22.9 22 22 10 12.7 5/8" SUC 5/8 52.1 31.0 24.4 24 27 12 15.9 3/4" SUC 3/4 53.6 33.3 24.4 27 30 15 19.1 1" SUC 1 64.8 40.4 31.2 35 38 21 25.4 Tube Size (OD) Part No. A B C D E F G 4mm SUC 4 37.3 24.1 13.7 12 12 3 4 6mm SUC 6 41.0 26.2 15.3 12 14 4 6 8mm SUC 8 43.2 28.2 16.2 14 17 6 8 10mm SUC 10 46.2 31.0 17.2 19 19 8 10 12mm SUC 12 51.2 31.0 22.8 22 22 10 12 Dimensions for Reference Use Only: Imperial fittings in mm, Metric fittings in mm, U.S.O.