Duolok Tube Fittings and Tube Fitting Adapters
Duolok® stainless steel tube fittings use a double-ferrule design to create leak-tight performance in analytical and process instrumentation applications where leak-tight performance can have a significant impact on quality, productivity and cost. In addition to stainless steel, Duolok are available in brass, Monel®, and Hastalloy-C®.
Duolok Quick Links
Select Duolok Tube Fittings
Special Ordering Information
Duolok Fractional Catalog
Doulok Metric Catalog
Tube Pressure Rating Table
Tube Temperature Rating Tables
Tube Fitting Safety
Duolok Specifications |
| Types |
Doulok Tube Fittings |
| Sizes |
Fractional: 1/16 to 2 in
Metric: 3 to 50 mm |
| Maximum Operating Pressure |
12,000 psig (825 bar)
@ 100° F (38° C) |
| Range |
-325° F to 1200° F
(-198° to 648° C) |
| Materials |
Stainless steel, carbon steel, brass, monel. Other materials are available on request. |
| Connections |
Tube fittings, NPT, ISO/BSP, SAE/MS, AN, weld ends, port connectors, tube adapters |
| Configurations |
Straights, elbows, tees, crosses, caps, plugs |
| Special Tube Fittings |
Bore-through/heat exchanger, dielectric, calibration, bulkhead, tube inserts |
Intermix and Interchangeability
Duolok tube fittings are designed, manufactured, and quality controlled to be totally "interchangeable" with the Swagelok® brand of tube fittings. Further, component-by-component examination plainly shows the two brands as completely "component-intermixable". SSP has conducted exhaustive testing to ensure that our fittings perform when intermixed with Swagelok® tube fittings.
Design
Duolok tube fittings consist of four precision-machined components: body, front ferrule, back ferrule, and nut. The double-ferrule design, with the staged sequential swaging action of the fe
rrules 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. Duolok tube fittings provide a reliable, leak-proof connection for analytical and process instrumentation and process tubing systems.
Materials
Duolok 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. Elbows, tees and crosses, are machined from close-grained 316 stainless steel forgings in accordance with ASTM A-182. All 316 stainless steel. Components are heat code traceable with certified material test reports (CMTRs) are available. More information about Duolok materials.
Packaging
Duolok tube fittings are individually bagged to assure the highest levels of quality, safety and cleanliness. The protective bags eliminate contamination (tubing burrs, dirt, etc.) from entering the fitting prior to its use, and help to retain the integrity of the factory assembled body, nut, and ferrules.
As long as a Duolok tube fitting is in its original protective bag, it is identified as "factory new," completely assembled and ready for installation. The individually bagged Duolok tube fittings are packaged in convenient, small-lot quantities for easy procurement and handling. Additionally, for efficient product identification and storage, the boxes are color-coded to the material of construction and have pictorial labels which include the part number, product description, and box quantity.
Installation
Griplok tube fittings are designed for easy installations using hand tools or automatic installers such as the Turn Pro automatic swaging tool. Learn more about Doulok installation.
Training
Proper tube fitting make-up and assembly are critical in providing leak-tight performance. SSP and SSP distributors provide extensive installation training. Related training courses cover tube fitting and tubing installation, selection and use of tubing tools, Cutting and preparing tubing, and tube bending.
Certifications
Duolok 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, They 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 Testing
Duolok tube fittings have been approved by or tested to meet the meet the requirements of the following organizations and standards:
Tools and Accessories
SSP offers tools and accessories to support assembly and installation and the tubing cutting, preparations and bending. See tools and accessories.
Selecting Duolok Tube Fittings