Gaugeability

UNILOK tube fittings are produced in accordance with the exact and tight tolerance. Without such close tolerance, the interaction of the nut, the ferrules and the body would not be interacted properly.

Corrosion

Resistance UNILOK ferrules have the strongest corrosion resistan-ce by our own special hardening process. It has been proved in various of industrial areas for some decades.

Interchangeability

UNILOK tube fittings can be interchanged with the tube fittings which are manufactured by the international standard.

Less Torque and Anti Distortion

When the nut is tightened, both ferrules are driven forward between the nut and the body. This axial movement doesn’t transfer any torque from the fitting to the tubing when original tubing’s mechanical properties are maintained.

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.

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.

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.

Every UNILOK tube fittings with metric tube end have a stepped shoulder to distinguish the fittings with fractional tube end.

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.

The proper selection of tubing is essential to assure maximum fitting reliability and performance. When choosing tubing material,
size and wall thickness, consider system’s pressure, flow rate, temperature, environment and compatibility with great care.

Stainless Steel Tubing

Fully annealed and seamless stainless steel tubing to comply with ASTM A269 or equivalent. Hardness should not exceed Rb 80.
Tubing should be free from scratched and suitable for bending and flaring.

For gas service application, use only tubing with wall thickness on outside of gray areas. Allowable stress of 20000 psig between
-29°C(-20°F) and 37°C(100°F) based on ultimate tensile strength to be 74000 psig.

Copper

Tubing Fully annealed and seamless stainless steel tubing to comply with ASTM B75 or equivalent. Hardness should not exceed Rb 60.

For gas service application, use only tubing with wall thickness on outside of gray areas. Allowable stress of 6000 psig between
-29℃(-20℉) and 37℃ (100℉) based on ultimate tensile strength to be 30000 psig.

Monel Tubing

Fully annealed and seamless stainless steel tubing to comply with ASTM B165 or equivalent. Hardness should not exceed Rockwell Rb 75.

For gas service application, use only tubing with wall thickness on outside of gray areas. Allowable stress of 6000 psig between
-29℃(-20℉) and 37℃ (100℉) based on ultimate tensile strength to be 30000 psig.

To determine allowable working pressure at elevated temperature,
multiply allowable working pressure and factors which are shown in the table.

Example: 316SS Tubing, 1/2″ODx0.049″WT at 310℃ AWP: 3750 x 0.85 = 3187 psig.

* MAWP: Maximum Allowable Working Pressure
* AWP: Allowable Working Pressure

The end connections with the lower pressure rating is the determining factor of pressure rating for the fittings with both UNILOK tube ends and pipe thread ends .

Tapered Pipe Threads – NPT or ISO 7/1(BSPT)

Allowable pressure ratings for male and female threads are based on ASME B31.3 at ambient temperature.

ISO 228/1 Parallel Thread (BSPP)

The pressure ratings are at ambient temperature

O-Seal Fittings

Rated to 206 bar (3000 psig) for 316SS fittings up to 1 inch and 25mm

NPT Pipe Thread

NPT (National Pipe Thread) is based on ANSI B1.20.1

ISO 7/1 Tapered Pipe Thread

International Organization for Standard (ISO 7/1) Tapered (PT) Equivalent to BSPT (British Standard Pipe Taper Thread), DIN 2999, JIS B0203

ISO 228/1 Parallel Pipe Thread

International Organization for Standard (ISO 228/1) Parallel(PF) Equivalent to BSPP (British Standard Pipe Parallel Thread), DIN ISO228/1, JIS B0202 Gasket or O-ring is normally used to seal into the parallel female threaded components.

UNILOK fractional(inch) size tube fittings are ordered by part number as shown below.

Example: The following part number, UMC-0804N-SS, is designated for Male Connector, 1/2″OD x 1/4″ Male NPT, 316SS.

UNILOK PTFE fittings are ordered by part number as shown below.

Example: The following part number, UMC-0404N-TF is designated for Male Connector, 1/4″O.D. x 1/4″ M-NPT, PTFE.

UNILOK metric size tube fittings are ordered by part number as shown below.

Example: The following part number, UMC-M1204R-SSS, is designated forMale Connector, 12mmOD x 1/4″ Male BSPT, 316SS.

Dimensions are for reference only and are subject to change without prior notice. E is minimum opening. F and L are typical finger tight