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Tube Fittings
Inspection and Testing
At D-lok, We supply thoroughly inspected and tested high quality products to meet the needs of our clients. All tests are performed in accordance to the specifications provided by our client as well as the American Society for testing and Materials (ASTM)
Limited Lifetime Warranty
D-lok warrants to the purchaser that D- lok tube fittings are free from defects in materials and workmanship and will perform substantially in accordance with the product specifications. This warranty is extended to Individual components as well as complete assemblies; provided they are in compliance with product installation and operation instructions. Defects resulting from operator abuse, negligence, misapplication; failure to install, adjust, and operate according to manufacturer instructions will not be covered.

In the product should become defective during the warranty period, D-lok will replace it free of harge, provided the defective component is returned along with date of purchase and statement of defect.

D-lok liability is limited to this written warranty. No other warranty is expressed or implied, nor does this warranty cover so-called incidental or consequential damages.
Table 1
Qarious Temperatures
Using Allwable Stress Factors Table 1.
To determine maximum allowable working pressure at elevated
temperatures, multiply working pressure from table 2,3 and 4 by
factor shown in Table 1.
Table 2
High quality soft annealed seamless copper tubing ASTM B-75 or equibalent.
Table 3
Fully annealed high quality (Type 340, 316, etc.) (Seamless or Welded) Stailess Steel hydraulic tubing ASTM A-269 or A-213 or equivalent. Hardness = Rb80 or less Tubing free of scratches, suitable for bending and flaring.
Table 4
Fully annealed quality Seamless MONEL400 hydraulic tubing ASTM B-165 or equivalent.
Hardness = Rb75
tubing free of scratches, suitable for bending and flaring.
D-lok tube fittings have been specifically designed for use on instrumentation, process and control systems, equipment employed in chemical, petroleum, nuclear power generation, and plup and paper plants. The D-lok tube fitting has also found extensive application in other fields where a very high quality tube fitting is required.
Construction and Materials
D-lok tube fittings are sequential phase-controlled action, sealing and gripping devices. Superior design, rigid manufacturing tolerances, and strict quality assurance programs produce an all-metal sealing and holding device which performs leak-free when properly installed. D-lok tube fittings consist of a body, a nut, and ferrules and are constructed of one of the following materials: brass. 316/304 stainless steel, steel, nickel alloy, monel, or inconel. Straight fittings are machined from cold finished bar stock and shaped bodies are machined from close grain forgings. The materials used, fully conform to the chemical requirements of one or more of the specifications listed in Table 5 on this page. Nut internals are supplied standard with silver plating. For nuclear and other critical applications, stainless steel D-lok tube fittings are readily available with documented heat code traceability.
Table 5