FASTENER IDENTIFICATION AND TORQUE DATA - …

1 CIRRUS AIRPLANE MAINTENANCE MANUALMODEL SR2220-60 Page 1 AllEFFECTIVITY: FASTENER IDENTIFICATION AND TORQUE DATA1. DESCRIPTIONThis section contains information on the correct usage and IDENTIFICATION of bolts, flat washers, lock wash-ers, nuts, lock nuts, fittings and TORQUE data . The nuts, bolts, and washers used on the airplane are in accordance with Air Force Navy Specifications, Military Specifications, and National Aircraft Apr 200720-60 Page 2 AllEFFECTIVITY:CIRRUS AIRPLANE MAINTENANCE MANUALMODEL SR2215 Apr 20072. MAINTENANCE PRACTICESA. BoltsBolts can be identified by the marking(s) located on the head of each bolt. When securing a FASTENER , use the TORQUE specifications from the following tables. (See Figure 20-601)When torquing fasteners which do not have a specific TORQUE pattern called out, refer to the general TORQUE patterns shown.

2 (See Figure 20-602)CAUTION:Composite and non-composites require different TORQUE values. Make sure to select the correct TORQUE Self Locking NutsWhen torquing a self-locking nut, the nut should be run down on the threads of the bolt until the nut almost contacts the mating surface. The amount of TORQUE required to run the nut down (friction drag TORQUE ) should be measured and added to the amount of TORQUE specified for the removal and installation will cause the self-locking nut to lose its locking feature. They should be replaced when they are no longer capable of maintaining the minimum prevailing :Never use a tap in a self locking nut or nutplate. Discard these parts, if this has occurred. Never install a self locking nut or nutplate backwards on a bolt. Discard these parts if this has AIRPLANE MAINTENANCE MANUALMODEL SR2220-60 Page 3 AllEFFECTIVITY:Figure 20-601 Bolt IdentificationAluminumAlloy (2024)BoltAN StandardSteel BoltAN StandardSteel Bolt4037 COOPERC levis BoltAN StandardCorrosoion ResistantSteel BoltAN StandardSteel BoltASSOCIATESAEROAN StandardSteel BoltDrilled Head BoltOrange-DyedMagneticInspectedSPECS pecialBoltReworkedBoltLow StrengthBoltWFOM agneticallyInspectedNAS CloseToleranceBoltSNMAN StandardSteel BoltAN StandardSteel Bolt4AN StandardSteel BoltCAN StandardSteel BoltSpecialBolt565-59131 SpecialBoltLENGTHGRIPDIAMETERHEAD HOLESHANK HOLEPart Number on HeadNASI307-34 Bolt heads marked with a dash indicatea corrosion resistant steel heads marked with "x" indicatea non-corrosion resistant steel Apr 200720-60 Page 4 AllEFFECTIVITY.

3 CIRRUS AIRPLANE MAINTENANCE MANUALMODEL SR2215 Apr 2007 Figure 20-602 General TORQUE Pattern1061 3 784 295 TYPICAL LINEAR PATTERN TORQUING SEQUENCE SR22_MM20_1977159371126104812 TYPICAL CIRCULAR PATTERN TORQUING SEQUENCE CIRRUS AIRPLANE MAINTENANCE MANUALMODEL SR2220-60 Page 5 AllEFFECTIVITY:ItemAMM Chapter/SectionReferenceInch PoundsNmMinimum Dry TorqueMaximum Dry TorqueMinimum Dry TorqueMaximum Dry TorquePropeller mounting mounting gover-nor mount to firewall bolts (1/4 ) mount to firewall bolts (1/2 ) landing gear spindle nut32-20(Refer to 32-20)(Refer to 32-20)(Refer to 32-20)(Refer to 32-20)Nose wheel axle nut32-20 Preload 150 Final 20 Preload 150 Final 40 Preload Landing Wheel Nut32-41(Refer to 32-41)(Refer to 32-41)(Refer to 32-41)(Refer to 32-41)Main landing gear upper attach fit-ting to rib fitting landing gear fitting to canted rib clamp wing attach-ment wing spanner exhaust landing gear aft mounting mount bolts (1/2 inch) 20-603 Specific TORQUE Requirements15 Apr 200720-60 Page 6 AllEFFECTIVITY.

4 CIRRUS AIRPLANE MAINTENANCE MANUALMODEL SR2215 Apr 2007 NON-COMPOSITE STRUCTURET orque Specifications for High Strength Steel Tension Nuts and Bolts with FINE ThreadsItemThreadSizeInch PoundsNmMinimum Dry To r q u eMaximum Dry To r q u eMinimum Dry To r q u eMaximum Dry TorqueSTEEL TENSION NUTSAN310AN315AN363AN365MS17825MS20365MS 21045 NAS1021 NAS679 NAS1291 STEEL TENSION BOLTSMS20004 thru MS20024 NAS144 thru NAS158 NAS333 thru NAS340 NAS583 thru NAS590 NAS624 thru NAS644 NAS1303 thru NAS1320 NAS6603 thru -181,1001, -181,2501, -162,6503, -143,5504, -144,5005, -126,0007, -1211,00013, 20-604 TORQUE Specifications (Sheet 1 of 8)CIRRUS AIRPLANE MAINTENANCE MANUALMODEL SR2220-60 Page 7 AllEFFECTIVITY:NON-COMPOSITE STRUCTURET orque Specifications for High Strength Steel Shear Nuts and Bolts with FINE ThreadsItem ThreadSizeInch PoundsNmMinimum Dry To r q u eMaximum Dry To r q u eMinimum Dry To r q u eMaximum Dry To r q u eSTEEL SHEAR NUTSAN320AN364 NAS1022MS17826MS20364 STEEL SHEAR BOLTSNAS464 NAS6203 thru NAS6220 NAS1103 thru -161,6001, -142,1002, -142,7003, -123,6004, -126,6008, 20-604 TORQUE Specifications (Sheet 2 of 8)15 Apr 200720-60 Page 8 AllEFFECTIVITY.

5 CIRRUS AIRPLANE MAINTENANCE MANUALMODEL SR2215 Apr 2007 NON-COMPOSITE STRUCTURET orque Specifications for Standard Steel Shear Nuts with FINE ThreadsItem ThreadSizeInch PoundsNmMinimum Dry To r q u eMaximum Dry To r q u eMinimum Dry To r q u eMaximum Dry To r q u eSTEEL SHEER NUTSAN320AN364 NAS1022MS17826MS20364MS21042MS21083MS212 458-3679 1/4 -283040 -2460 85 -2495 110 -20270300 -20290 410 9/16 -18480 600 -18660780 -161,300 1,500 -141,500 1,800 1 -142,200 3,300 -123,000 4, -125,400 6,600 20-604 TORQUE Specifications (Sheet 3 of 8)CIRRUS AIRPLANE MAINTENANCE MANUALMODEL SR2220-60 Page 9 AllEFFECTIVITY.

6 NON-COMPOSITE STRUCTURET orque Specifications for Standard Steel Tension Nuts and Bolts with FINE ThreadsItem ThreadSizeInch PoundsNmMinimum Dry To r q u eMaximum Dry To r q u eMinimum Dry To r q u eMaximum Dry To r q u eSTEEL TENSION NUTSAN310AN315AN363AN365 NAS1021MS17825MS21044MS21045MS21046MS203 65MS20500 NAS679 STEEL TENSION BOLTSAN3 thru AN20AN42 thru AN49AN73 thru AN81AN173 thru AN186MS20033 thru MS20046MS20073MS20074AN509NK9MS24694AN52 5NK525MS270398-361215 -24100140 -20450500 -188001, -181,1001, -162,3002,500 -142,5003000 -143,7004,500 -125,0007,000 -129,00011,000 20-604 TORQUE Specifications (Sheet 4 of 8)15 Apr 200720-60 Page 10 AllEFFECTIVITY:CIRRUS AIRPLANE MAINTENANCE MANUALMODEL SR2215 Apr 2007 NON-COMPOSITE STRUCTURET orque Specifications for Standard Steel Tension Nuts and Bolts with COARSE ThreadsItem ThreadSizeInch PoundsNmMinimum Dry To r q u eMaximum Dry To r q u eMinimum Dry To r q u eMaximum Dry TorqueSTEEL TENSION NUTSAN310AN315AN363AN365 NAS1021MS17825MS21044MS21045MS21046MS203 65MS20500 NAS679 STEEL TENSION BOLTSAN3 thru AN20AN42 thru AN49AN73 thru AN81AN173 thru AN186MS20033 thru -101,1501, -92,2003, -83,7005, -85,5006, -86,5008, 20-604 TORQUE Specifications (Sheet 5 of 8)CIRRUS AIRPLANE MAINTENANCE MANUALMODEL SR2220-60 Page 11 AllEFFECTIVITY.

7 NON-COMPOSITE STRUCTURET orque Specifications for Standard Steel Shear Nuts with COARSE ThreadsItem ThreadSizeInch PoundsNmMinimum Dry TorqueMaximum Dry To r q u eMinimum Dry To r q u eMaximum Dry To r q u eSTEEL SHEER -91,3001, -82,2003, -83,3004, -84,0005, 20-604 TORQUE Specifications (Sheet 6 of 8)15 Apr 200720-60 Page 12 AllEFFECTIVITY:CIRRUS AIRPLANE MAINTENANCE MANUALMODEL SR2215 Apr 2007 COMPOSITE STRUCTURET orque Specifications For FINE Thread Hex-head Tension And Shear Bolts, Or Any Bolted Structure With Combinations Of Composite And Metallic Parts Thread SizeInch PoundsNm Minimum Dry To rqu eMaximum Dry To rqu eMinimum Dry TORQUE Maximum Dry 3/8 20-604 TORQUE Specifications (Sheet 7 of 8)CIRRUS AIRPLANE MAINTENANCE MANUALMODEL SR2220-60 Page 13 AllEFFECTIVITY:Minimum Prevailing Drag TORQUE for Reused Self-locking NutsFine ThreadCourse ThreadThread SizeInch-PoundsNmThread SizeInch-PoundsNm7/16 20-604 TORQUE Specifications (Sheet 8 of 8)15 Apr 200720-60 Page 14 AllEFFECTIVITY:CIRRUS AIRPLANE MAINTENANCE MANUALMODEL SR2215 Apr 2007C.

8 Calculating TORQUE (See Figure 20-605)CAUTION:Over-torquing of fasteners can result in failed fasteners and/or components. Under torquing a FASTENER can result in premature wear of the FASTENER and/or the fastening material which can result in failure of the component and/or FASTENER . Note:Observe TORQUE values and the installation of the recommended safetying device for every FASTENER . Impact-type wrenches should never be used on any FASTENER whose TORQUE is crucial. If a nut is slightly over torqued, it must be loosened and then re-torqued to the correct value. Never back off a nut or a bolt and leave it un-torqued. Exceeding the maximum recommend TORQUE is not permissible. To assure an accurate TORQUE measurement, a smooth and even motion must be applied. Whenever a bolt is torqued on the head side instead of torquing the nut, additional resistance (friction drag TORQUE ) may occur due to the friction of the shank during rotation.

9 This could result in an under-torqued fas-tener. The value (friction drag TORQUE ) observed from the TORQUE wrench indicator during the initial tight-ening phase of the bolt (before seating of the bolt has been accomplished), must be added to the TORQUE value given in the specified TORQUE table. When checking friction drag TORQUE , use a TORQUE wrench which allows the friction drag TORQUE to fall in the middle of the overall range of the TORQUE using a TORQUE wrench with an adapter that changes the distance from the TORQUE wrench drive centerline to the adapter centerline, compensation must be made for the extra leveraged gained. New TORQUE specifications must be calculated before the wrench is used. To calculate the new TORQUE speci-fications, use the formula in Figure 20-605. (See Figure 20-605)(1)Requirements for Calculating TORQUE (a)When selecting a TORQUE wrench, select one that has the required TORQUE specification in the middle of the overall range of the TORQUE wrench.

10 When lower TORQUE specifications are called out, always use an inch-pound TORQUE wrench or a smaller foot-pound TORQUE wrench. Use only calibrated TORQUE wrenches that have been certified.(b)Calibrate the TORQUE wrench and recheck calibration frequently to assure accuracy.(c)Thoroughly clean and dry all threads and fasteners prior to torquing.(d) TORQUE only to the specified range; stopping instantly at the correct TORQUE .(e)When using a TORQUE wrench adapter be certain to allow for the additional extension length when torquing.(f)Sheet metal screws and screws tightened to nutplates should be tightened firmly.(g)Always start the nut or bolt by hand prior to the torquing process.(h)Screws using dimpled washers should be drawn tight enough to eliminate the crown of the washer.(i)Specified torques must be considered dry torques.(j)Castellated nuts requiring cotter pins should be tightened to low TORQUE value.