Materials
UNILOK fittings are available in various kinds of materials as below. Straight fittings are machined from cold finished bar stock and shaped fittings from forgings. For more details or special application, contact your local distributors.
Materials Bar Stock Forgings
316 SS or 316L SS ASTM A479
ASME SA479
ASTM A182
ASME SA182
Brass® ASTM B16
ASTM B453
ASTM B283
Alloy 400 (Monel®) ASTM B164 ASTM B564
ASME SB564
Alloy 600 (Inconel®) ASTM B166
Alloy 625 (Inconel®) ASTM B446
Alloy 825 (Inconel®) ASTM B425
Alloy C-276 (Hastelloy®) ASTM B574 ASTM B564
PTFE ASTM D1710 ASTM D3294
Duplex (SAF 2205®)
UNS S31803 / S32205
ASTM A479 ASTM A182
Super Duplex (SAF 2507®)
UNS S32750
ASTM A479
UNS 31254
(Incoloy 25-6MO®)
ASTM B649

(1) Nickel Plating is available as optional.

  • Monel, Inconel, Incoloy 25-6MO are the trade marks of Special Matals.
  • Hastelloy C is the trade mark of Haynes International.

Sour Environment Services

UNILOK tube fittings are comply with NACE MR-0175/ISO 15156 for sour oilfield application or NACE MR-0103 for petroleum refining operations.
To order, add – N to the end of part number.
Identification of Metric UNILOK Tube Fittings
Every UNILOK tube fittings with metric tube end have a stepped shoulder to distinguish the fittings with fractional tube end.
Cleaning
UNILOK tube fittings are free from machine oils, loose particles and grease throughout the close cleaning process.
UNILOK tube fittings for oxygen enriched systems are available by the special cleaning procedure. To order, add OX to the part number.
Installation Instruction

1. Firmly insert the tubing until it bottoms in the fitting body.
2. Finger tighten the nut.
3. Mark the nut at the 6 o’clock position, with pencil or scribe.
4. Hold the body with a backup wrench, or vice, then tighten nut.
5. 1-1/4 turns to the 9 o’clock position.
6. The above applies to all fittings from 1/4″to 1″(6mm to 25mm).
7. Fittings from 1/16″to 3/16″(3mm to 4mm), only 3/4 turn is required.

Reassembly – Simply insert tube assembly into fitting body, tighten nut to the original position as indicated by the previous mark, then snug up slightly with a wrench.

Connects Fractional Tube to ISO Parallel Thread (Gauge)

Connects Metric Tube to ISO Parallel Thread (Gauge)


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