We, UNILOK corporation, have distinguished ourselves in the design and manufacturing of a high performance “Twin Ferrule Compression Tube Fittings” and “Instrumentation Valves” range since 1984
In addition, we have been manufacturing “the fittings and valves for UHP (Ultra High Purity) application” with our own design and technology since 2000.
Due to our outstanding capacity for innovation and our policy of investment in research and development as well as quality control, UNILOK has been able to capitalize on our expert knowledge, oriented towards the new expectations of customers worldwide in oil, gas, petro-chemical, on-offshore, ship building, power plant, semiconductor, flat panel display and solar industries.
Our well-trained staffs are dedicated to providing our customers with the very best service possible, and this service is backed up by our performance guarantee as well as quality assurance.
Systematic control is fully committed to utilizing the latest technology and information advancements to provide our customers with the maximum supports.
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.
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.
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.
Fully annealed and seamless stainless steel tubing to comply with ASTM B75 or equivalent. Hardness should not exceed Rb 60.
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.
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.
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.
60°Thread Angle Taper Angle 1°47′ Flat truncation of root and crest Pitch measured in inches
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
55°Thread Angle Round truncation of root and crest Pitch measured in inches Diameter measured in millimeters
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 metric size tube fittings are ordered by part number as shown below.
Example: The following part number UMC-M1204R-SS is designated for Male Connector, 12mmOD x 1/4″ Male BSPT, 316SS