Uni-Lok Tube Fittings

Uni-Lok Ultra High Purity Twin Ferrule Fittings

Fluidline are Sole distributors of Uni-Lok Tube fittings & valves to the South African & African markets.
Uni-Lok has been manufacturing precision “Twin Ferrule Compression tube fittings” and High performance valves for the instrumentation markets since 1984 and is certified for ISO-9001, ISO-14001, and Lloyds & CE standards. Uni-Lok fittings comply with NACE MR-0175/ISO 115156 for sour oilfield applications and NACE MR-0103 for petroleum refining operations.

Core Products – Uni-Lok twin ferrule compression tube fittings, Pipe & Threaded fittings in NPT, BSP & BSP Parallel threads to ASME B1.20.1 and piping class ANSI / AMSE B16.1, weld fittings, PTFE fittings and adapter fittings.

Interchangeability & Cost Effective Alternative – Uni-Lok manufactures tube fittings that are interchangeable with brands such as Swagelok, Parker A-Lok & Gyrolok twin ferrule fittings providing Fluidline the ability of offering you cost effective competitive solutions.

Leak Tight Seals & Full Traceability – Uni-Lok tube fittings are produced in accordance with exacting tolerances and maintain excellent surface finishes ensuring leak tight connections every time. Uni-Lok tube fittings are fully traceable with full certification including original material certification available upon request.

Fast Efficient Deliveries – Weekly air freight shipments complement Fluidline’s extensive stockholding and ensure Uni-Lok products lead times surpass industry standards.

Markets and Applications – Uni-Lok precision tube fittings & high pressure valves are used in the Oil & gas, Off-shore, Petrochemical, Pulp & paper, Chemical, gas, Power generation, mining, semiconductor & general Industrial markets in fluid delivery systems for instrumentation, hydraulics, & pneumatics.  Uni-Lok enjoys approvals at most of these markets throughout South Africa & into Africa and has a proven track record as an industry leader in the field of Instrumentation fittings & valves.

Material and Special Alloys – Uni-Lok tube fittings are standard in Stainless Steel 316, 316L & Brass and are available in special materials & alloys such as Alloy400 (Monel), Alloy 600 (Inconel), Alloy 625 (Inconel), Alloy 825 (Incoloy), Alloy C-276 (Hastelloy C), PTFE, Alloy 2205 / UNS 32205 (Duplex), Alloy 2207 / UNS 32750 (Super duplex) & UNS 31254 (Incoloy 25-6MO).



Instrumentation Tube Fittings

Instrumentation Tube Fittings

  • Size : 1/16″~2″ OD, 2mm~50mm OD
  • End Connection: Uni-Lok Port, Pipe Threads, Welded
    Systems, Stub
  • 316SS, Brass, Alloy
  • Excellent finish level
  • Radius junction in every elbow
  • Uni-Lok own special hardening and heat treatment process

PTFE Fittings

PTFE Fittings

  • MWP: 125psig/8.6bar
  • 1/4″~1/2″, 6~12mm


Precision Pipe Fittings

Precision Pipe Fittings

  • 1/8″~1″
  • 316SS, Alloys


Hose/Push-On Connectors

Hose/Push-On Connectors

  • 1/8″~1″
  • 316SS
  • Hose & Push-On


Fusible Connectors

Fusible Connectors

  • 1/4″~1/2″
  • 316SS
  • Plug & Adapter Types
  • 160~281


Weld and UCR Fittings

Weld and UCR Fittings

  • Size : 1/8″~1″
  • End Connection: Uni-Lok Port, UCR, Butt Weld, Pipe Threads
  • UHP Grade 316LSS Materials
  • Superior finished inner surface by Uni- Lok’s own EP and special cleaning process

Cylinder Connectors

Cylinder Connectors

  • CGA, JIS, DISS Types
  • Gland Size : 1/4? (standard), 3/8″ & 1/2″ (option)
  • UHP Grade 316LSS Materials
  • Patented bearing inclusive design enabling easy and safety installation

Pipe/Tube Fittings and Flanges

Pipe/Tube Fittings and Flanges

  • Size: Pipe 8A~300A, Tube 1/4″~2″
  • 304SS, 316SS, 316LSS
  • BA, EP Grades
  • Superior surface finished BA & EP grades
  • Exact dimensional tolerance










Tube Fittings and Adapters | Unilok

Unilok tube fittings are single-ferrule compression fitting which provide leak-tight and remakeable connections in process and analytical instrumentation, control systems, utilities and other applications.

Tube Fitting Male Union Elbow, Union Cross and Female Adapter - Unilok

Quick Links

  • Select Unilok Fittings
  • Unilok Tube Fittings Catalog
  • Pressure Rating Tables
  • Temperature Rating Tables
  • Warranty
  • Safety


  • MAWP: 12,000 psig*
  • Temperature Range: -325 to 1200°F
  • Materials: 316 SS, Alloy 400, C-276, and brass.  Other materials are available.
  • Sizes: 1/16 to 1 in.
  • Adapters: NPT, ISO/BSP, SAE/MS, AN, weld, tube stub, port connectors, and ORFS.
  • Shapes:  Straight, elbows, tees, crosses, caps, plugs,
  • Special fittings:  Bulkhead and extended (long), bore through, positionable, calibration and dielectric fittings, silver plated nut.
  • Accessories: Stop collars, bulkhead locks, nut and ferrule sets, prewrapped thread, tools and accessories

*Unilok tube fittings are rated to the maximum allowable pressure rating of the tubing they connect.

Unilok Technology

unilok tube fittings

To provide a reliable, leak-proof connection in instrumentation and process tubing systems, Unilok tube fittings consist of three precision-machined components: body, ferrule, and nut. The single ferrule design, with the spring-like action of the ferrule during make-up, compensates for the variation in tubing materials, hardness, and thickness of the tube wall to provide leak-tight connections in an extensive range of applications.

Through the critical interaction of the precisely machined fitting components with the process tube, a leak-tight seal is achieved. The simple geometric rotation of the Unilok nut provides the axial thrust necessary to coin the ferrule to the outside diameter of the tube. To eliminate any potential stress on an existing system, the they have been designed to not transmit installation torque from the fitting to the tubing.

During the rotary movement of the nut, the internal surface of the nut meets with the rear surface of the ferrule to axially move the ferrule forward into the angular section of the fitting body. The leading edge of the ferrule is directed into the tube to begin the required “bowing” action of the ferrule.

Subsequently, the leading edge of the ferrule “locks” on the outside diameter of the tube to complete the sealing action and secure the tube within the fitting. The resulting “spring-like action” of the ferrule is designed to help compensate for exposure to system variables such as vibration.

Interchange and Intermix

Unilok tube fittings are designed, manufactured, quality controlled and distributed to be totally “interchangeable”with the Parker CPI® brand of tube fittings and the components of the two brands are intermixable. The precision manufacturing of both products to stringent tolerances under rigid quality control procedures ensures the safety, performance and reliability of service whenever Parker CPI Fitting SSP Unilok component parts are mixed and used in accordance with published installation and service.


Unilok tube fitting straight configuration are machined from type 316 stainless steel cold-finished bar stock in accordance with ASTM A-276 and ASTM A-479. Tube fitting shapes, elbows, tees and crosses, are machined from close-grained 316 stainless steel forgings in accordance with ASTM A-182. All 316 stainless steel. Unilok components are heat code traceable with certified material test reports (CMTRs) are available.

Quality Certification

Unilok tube fittings are manufactured in accordance with SSP’s Quality System , which has been certified to conform to the ISO 9001:2000 Quality Standard. In addition, all Unilok tube fittings are manufactured to the technical design specifications and rigid quality control standards of the SSP Instrumentation Division. SSP’s continuing commitment to quality is reflected throughout the company in its personnel, policies, equipment, products and service.

Approvals and Test Reports

Unilok tube fittings have been tested and/or approved in accordance with the standards of following organizations:

  • American Bureau of Shipping
  • Unilok Tube Fitting Interchange and Intermix Test Report
  • CSA Report
  • Unilok Technical Report


Unilok tube fittings are individually bagged to assure the highest levels of quality, safety and cleanliness. Fittings are individually bagged and packaged in small-lot quantities.  Boxes are labeled with product photos, body material, and part number.  Product product installation instructions are included in each box.

Tube Fitting Installation Training

SSP and SSP distributors provide installation training courses covering tube fitting and tubing selection and installation and the proper use of swaging, cutting and bending tools.

Tools and Accessories

SSP offers tools and accessories to support tube fitting assembly and installation and the tubing cutting, preparations and bending.