Tightening And Torque Recommendations For ... - …

1 Gates CorporationC73 DATAEXT. & VERY HIGHPRESS. HOSEGS & HOSEMEGACRIMP BRAKEHOSE & /C5 HOSE & & HOSE& HOSE & & & ASSORT-MENTSPART NUMBERINDEXESF L E E TTechnical DataThe art of making a leak-proof connection with hydraulic couplings is to tighten the couplings properly at the time ofinstallation. An overtightened coupling may be just as apt to leak as an under-tightened coupling. This is becauseover- Tightening a coupling may result in overstressing and/or Torque values in the following tables give the minimum and maximum Torque Recommendations . The minimumvalue will create a leak-proof seal under most conditions. Applying Torque values greater than the maximum recom-mendation will distort and/or crack the fitting.

2 Values listed in SAE J514 are for qualification testing only and shouldnot be used as the basis for setting up Torque values for a production environment. These need to be establishedbased on the coupling manufacturer s Tightening couplings, make sure that the hose does not twist on the adapter. Twisting will shorten hose life andscar the sealing surfaces of swivel type couplings (JIC, 45 , etc.), which can create leaks. For straight couplings, usea Torque wrench on the hex, swivel, nut and a standard, box, wrench on the stem hex. Bent tube couplings can berestrained by holding onto the ferrule. When a crowsfoot wrench is used with a Torque wrench, adjustments to thetorque readings must be made otherwise overtightening will occur.

3 The distance E, as shown below, from the centerof the drive socket to the center of the crowsfoot must be added to the Torque value following equation can be used to make these adjustments:This example shows that the actual Torque is approximately 10% higher than the reading indicates. All torquerecommendations are based on dry threads. If oil or thread sealant is used, the maximum recommended torquevalues could be decreased by as much as 25%.We do recommend lubricating all O-rings prior to insertion into flange head and ORS grooves. This will minimize the possibility of nicking the O-ring when it is installed. The Torque values obtained from Tightening pipe threads can varyconsiderably, depending on the conditions of the threads.

4 Adequate sealing can occur at values much lower than the maximum values listed in the chart. However, the minimum Torque values must be used to obtain adequate Torque = (E+L)x ( Torque Wrench Reading), whereL L is in inches E is in inches Torque is in , , or Newton-MetersAn example of using this equation is shown below: Torque wrench reading = 45 = inchesL = 12 inchesActual Torque = ( +12)x (45) = And Torque RecommendationsFor Hydraulic CouplingsThe World s Most Trusted Name in Belts, Hose and Hydraulics. C74 DATAEXT. & VERY HIGHPRESS. HOSEGS & HOSEMEGACRIMP BRAKEHOSE & / C5 HOSE & & HOSE& HOSE & & & ASSORT-MENTSPART NUMBERINDEXESF L E E TTechnical DataSizeSteelBrassFractionalFt.

5 (In.) Fractional (In.) 8101113-41/41416202214162022-55/16 18202427-63/82426333524263335-81/2374450 6050606878-105/850606881728098110-123/47 583 101-1/2113125135170183-147/8 160180215245-161111125150170200220270300 -201-1/4133152180206210280285380-241-1 (In.) & Adapter Installation TorqueRecommendation ContinuedFor 37 & 45 (Machined or Flared) and MegaSeal For Flat-Face O Ring Seal (Steel)For SAE O-Ring Boss (Steel) & Gates (In.) BSP 30 Inverted SeriesHeavy SeriesTube (mm)(mm) 7151020-8 15262035-10-818302540-12-1022333045-14-1 226373550-15-1430524070 -1630524070-18 447460100-22-20598980120-28-257411110015 0 -3074162150220-35 133184180250-42-38148221200300 For DIN 2353 12 , 30 and Universal Inverted ConeMaximum Recommended Torquefor Dry NPTF (Tapered) Pipe Threads*Bolt SizeLine SizeTorque NmTorque 4-Bolt Flange Connections1.

6 The 4-bolt flange seal is a face shoulder which contains the seal mustfit squarely against the mating surface andbe held there with even tension on all Torque values apply to plated bolts and boltswith light engine Lubricate o-ring with a light oil (SAE 10W or20W) before Finger tighten all four bolts making sure theflange and fitting shoulder are started Tighten all bolts evenly by partially tighteningeach bolt as shown in the figure below andrepeating the sequence until all bolts aretightened to the specific Torque in the Pressures4,000 psi ( Mpa)and belowNewton-MetersWorking Pressures4,000 psi ( Mpa)and PressuresAbove 4,000 psi ( )Newton-Meters Working PressuresAbove 4,000 psi ( ) *NOTES:1.

7 The Torque values obtained from Tightening pipe threads can vary consider-ably depending on thread condition. Adequate sealing can occur at valuesmuch lower than the maximum values listed above. Only enough Torque toachieve adequate sealing should be When using a male tapered pipe thread with a female straight or parallelpipe thread, maximum values are 50% of those listed in the If thread sealant is used, maximum values shown should be decreased by 25%.MFA Torque SpecJ514 Section 6 Tighten finger tight until the tubing nolonger turns by hand (until the sleevehas started to grip the tube). = After the sleeve has grippedthe tube, tighten the nut one full turnor eight flats of the nut (360 ).