Full PDF Catalogs
<< Previous Page
to open this page in a new window.
Next Page >>
Catalog 3501E General Technical Pipe Thread Assembly Peripheral sealing of The two British Standard pipe thread forms used for Parker's standardparallel threads product are manufactured in a tighter tolerance range than required byPressure-tight joints of screwed the standards in order to facilitate the assembly and mating of fittingsconnections with parallel threads produced by the two different standards. In general, BS21 threads doare achieved by placing a seal not necessarily mate with BS2779 threads at tolerance overlap between the two machined faces conditions, but fittings located within this catalog can be assembled as follows: Flat seals Washers and rings are manufac- External Thread Mating Internal Thread tured in many different materials G-BS2779 (parallel) G-BS2779 (parallel) including copper, aluminium, fiber, Rp-BS21* (parallel) plastics, etc. Rs-BS21 (parallel) Rp-BS21 (parallel) The tightening torque at assembly G-BS2779 (parallel) must be carefully selected so as to avoid compressing the seal to the R-BS21 (taper) Rp-BS21 (parallel) point of extrusion. As a general Rc-BS21 (taper) rule, the fitting should be tightened G-BS2779 (parallel) with an additional 1/4 wrench turn *This thread must be manufactured within a from the fingertight position. reduced tolerance range to always assemble with the G series external thread. O-rings Depending upon the configuration British Standard ISO Metric Screw Threads of the female port or male thread, They are commonly used in miniature pneumatic applications becauseO-Ring seals are fitted with or of the availability of small thread diameters and are also used without back-up washers, and can extensively in the automotive industry. There are two forms of sealingbe fully retained in a captive seal. on metric screw threads. · O-ring sealing into a profiled port in accordance with ISO 6149. · Peripheral sealing with a copper or bonded washer in accordance with ISO 261 and 262. Flaring Instructions In order to properly flare copping tubing for use with Parker 45° Flared Fittings and Inverted Flared Fittings, the following procedures and specifications should be met in preparation and make-up of flares. 1) CUTTUBE WITHTUBE CUTTER: 3) FLARE TUBING: To minimize the burr and workhardening, use a light feed on the Flare with a compression or generating type flaring tool. Follow tool cutting wheel and make several revolutions. manufacturer's instructions for: (A) positioning the tube in tool and (B) for the correct number of turns on the feed handle. 2) REAM THETUBING: Cutting with a tube cutter will always create a burr.The burr must be4) INSPECTTUBING: removed to obtain maximum sealing surface. Remove only the burr, The flare cone should be checked for a smooth surface on the I.D. of do not remove material from the original wall thickness. Also cleanthe cone and measure with micrometer over largest O.D. for proper the tube end thoroughly to remove burrs. size. (See dimensions below for flare size for each tubing size.) D Single Nominal A Single Flare B Single Flare Wall Tube Diameter Flare Radius Thickness in in in in B Max. Min. ±0.01 Max. 47° 1/8 0.0181 0.171 0.02 0.035 43° M 3/16 0.0249 0.239 0.02 0.035 1/4 0.325 0.315 0.02 0.049 91° TUBE 5/16 0.404 0.388 0.02 0.049 89° FLARE OD 3/8 0.487 0.471 0.02 0.065 SEAT A 7/16 0.561 0.545 0.02 0.065 1/2 0.623 0.607 0.02 0.083 9/16 0.676 0.660 0.02 0.083 D 5/8 0.748 0.732 0.02 0.095 3/4 0.916 0.900 0.02 0.109 SLIGHT FLAT PERMISSIBLE 7/8 1.041 1.025 0.02 0.109 1 1.157 1.141 0.02 0.120 M6 Parker Hannifin Corporation Parker Brass Products Division Otsego, Michigan