NATIONAL AEROSPACE STANDARD {© coPYRUGHT 2012 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC AL RIGHTS RESERVED ‘Seinen Fen rece onbenwaronsehscnrcesTnoAsOSeas ‘ome RB FORA PARPADIAS APRACATIN OR (2) Te EXSTENCE Or Ce ALCRSEPP ASTD PONS HOON FSS FeO SUPPLY CASS 5305 (o08[A LENGTH #033 /7/ g HEAD MARKING PER NAO043, wal oD ‘Weel 3 = 9 2 | E 8 RRAD [8/ J i / Je 1 : eT : 205° —— a Ef A 1 wr 08 Ir id | SR —| a E \ Lik Pa g 1 r is) 2 NK L 99 RADIUSED EDGE OFFSET CRUCIFORM RECESS OPTIONAL PER WaoD2s THREADS IN ACCORDANCE WITH Py oe FED-STD-H28/21 /12/ 008 NOT CONCAVE! Es) PITCH ta __TABLE I DIMENSIONS DIA | THREAD [(@a)| @8 |—E | (H) | 0Q | & | OU | OFFSET CRUCIFORM RECESS | TENSILE cope} 46H | max | man | Gace | /10/ | Gace | RAD RECESS | INSPECTION | FORCE 19) PROT ny NO. Torque. | MIN 5 fy Nat N ¥ 030 2505] 03 [La u or6 | mn6x035] 3,2] 29] 059 foes] 2208} 05 [it] 04 1.300 HA ozo |maxoa | 40] 36] O84 [ons] 325) 93/247 08 2090 2 OAL 4,005 | 0,3 | 1.9 b ons |mz5x045| 50] 45] oa | 105 Sool or le) 3 13 3.370 a5 OBL 4805 [0.4 12,3 a 030 | wax05 | 60] 54] O84 |s27] 4805] 04 [237 4 18 4930 c 0,63 6,505 | 04 [3,0 ge o4 |msxo7 | eo] 72] cee | 69] Geo] of [38] 8 42 8720 2 0,72 8.305 | 05 | 38 i 50 |rasxoe | roo] 90] 07% | az] 8305/95/38) 10 56 13900 080 10,105 | 0,7 [4,7 a 093 43,805 | 07 [67 H ogo |wax1 | 160} 348 | O92 [3,30] 2805] 97 167) srs 28 37 300 406 17,505] 08 | 84 i 300 | u10x1,25 | 200] 198] 4Ss | 424] Hen | ce loa] 38 48 38 300 g25 HT @ comptereny revise Tao TOON ESN BE oy OSE NATIONAL AEROSPACE STANDARDS COMMITTEE 2 e PROCIRENENT Tie ‘Gissincarion g beaeceatend SCREW, MACHINE, 100° FLUSH HEAD, PART STANDARD 3 NAO026 OFFSET CRUCIFORM RECESS, FULL THREAD, NA0O70 3 | except as NoreD ‘A286 CRES, 1100 MPa, METRIC SHEET 10F 3 omy snares RE WON Ts Doct Of KATIA AERGSPCE SUABBIRUARSEVAGRANOLUNTARE, MA COES HOT CUAL SUPPLIERS oR cXTFY coacneNe REVISION OATE: WOVENBER 3, 2012 TSSUE DATE: DECEMBER 1579a MATERIAL: g 286 CRES PER PROCUREMENT SPECIFICATION. é & HEAT TREATMENT: é z 41100 MPA MINIMUM ULTIMATE TENSILE. | ‘FINISH: g id PASSIVATE PER AMS2700, METHOD 1, CLASS 4. i 2) cove: eee FIRST THREE NUMBERS DESIGNATE NOMINAL THREAD SIZE AS TABULATED. ‘SECOND THREE NUMBERS DESIGNATE NOMINAL LENGTH IN EVEN NUMBER INCRENENTS. SEE ‘TABLE Il FOR RECONMENDED LIMITS. EXAMPLE OF PART NUMBER: NATIONAL AEROSPACE STANDARD (© COPrRUGNT 2012 AEROSPACE INOUSTRIES ASSOCIATION OF AMERICA, INC. ALL RIGHTSRESERVED —__revmta vee snot 1NAO070-025016 = SCREW; MJ2,5 x 0,45 THREAD; 16 mm LONG SURFACE ROUGHNESS: BEARING SURFACE OF HEAD, HEAD TO SHANK FILLET RADIUS, SHANK AND a ‘ALL THREAD ELEMENTS 0,8 MICROMETERS Ra; ALL OTHER SURFACES 3,2 MICROMETERS Ra PER ff ASME 6.1, E; Bb ete rssh Sale cs AN aa a Lee ene tO : (OERSTEDS USING A MAGNETIC PERMEABILITY INDICATOR PER ASTM A342/A342M, TEST METHOD 3. cence mena 3 |e omen m miners mo onan nue one eC é 3 (5) _ DIMENSIONING AND TOLERANCING PER ANSI Yi4.5¥-1962M, i 16] INCOMPLETE THREADS IN ACCORDANCE WITH FED-STD-H28/21. POINT SHALL BE FLAT AND 5 CHAMFERED TO 45° APPROXIMATELY FROM "OU u 77] SCREWS 40 MILLIMETERS OR LESS IN LENGTH SHALL HAVE COMPLETE THREADS TO WITHIN TWO u ‘THREAD PITCHES OF HEAD BEARING SURFACE. LONGER SCREWS SHALL HAVE A MINIMUM COMPLETE by ‘THREAD OF 35 MILLIMETERS. DIAMETER OF UNTHREADED PORTION OF SCREW SHALL NOT BE LESS i “THAN MINIM PITCH DIAMETER NOR MORE THAIN MAXIMUM MAJOR DIAMETER OF THREAD. c 2 i 18) FILLET RADIUS TO BE COLD WORKED. eMSION 3 2 & | © conmuzrerynewsen NA0O70 ‘eer? soiree SAF ste mncan inert sent aso inonartcicarata Seneeg) PUAN ‘enn mney a HRANYO4RPAEA ATION Ot 2) Te STEN OF Of PPL RMPUSSERETCSPPMENTON EAESOOINS RTSNATIONAL AEROSPACE STANDARD (© COPYREGHT 2012 AEROSPACE INDUSTRIES ASSOCTATION OF AMERICA INC. ALL NQHTSRESERVED ta elite sud 1/9) RECESS SHALL BE TORQUE TESTED IN BOTH INSTALLATION AND REMOVAL DIRECTIONS WITH DRIVER PER NAOO25 WITH AXIAL END PRESSURE NOT EXCEEDING 6GN, SCREWS ARE REJECTABLE IF MINIMUM TORQUE VALUES SPECIFIED CAUSE FRACTURE OF FASTENER OR DISTORTION WHICH RESULTS IN RAISE OF METAL AT EDGE OF RECESS EXCEEDING 0,15 ABOVE SURROUNDING AREA. ‘SAMPLING SHALL BE PER ANSI/ASQ 21.4, 496 AQL, LEVEL S-1, 110] DIMENSIONS "(OA)" AND "(Hy" ARE INCLUDED FOR ENGINEERING REFERENCE PURPOSES ONLY AND. ‘ARE NOT TO BE USED FOR INSPECTION, VALUES "(QA)" AND “(H)" ARE CALCULATED LIMITS, RESULTING FROM TOLERANCES "98", "E", "2Q", AND HEAD ANGLE, [11 GAGE PROTRUSION SHALL BE INSPECTED PER NAOO48, 112] ACCEPTABILITY OF SCREW THREADS SHALL BE IN ACCORDANCE WITH FED-STD-H28/20 SYSTEM 22, 113] CODE NUMBERS REPRESENT LENGTH IN WHOLE MILLIMETERS. SPECIFY LENGTHS IN 2 mm INCREMENTS THROUGH 100 mm LENGTHS. SPECIFY IN 4 mm INCREMENTS IF LENGTH LONGER THAN 100 mm IS REQUIRED. \ROSPACENEUSTIES ASSOCIATION OF MERIC, ‘ie wasn. (14) THIS STANDARD TAKES PRECEDENCE OVER DOCUMENTS REFERENCED HEREIN. (15) __ UNLESS OTHERWISE SPECIFIED, PART INVENTORY MANUFACTURED TO PREVIOUS REVISIONS OF ‘THE APPLICABLE DRAWING OR SPECIFICATION MAY BE PROCURED AND USED UNTIL STOCK IS DEPLETED. (2S) UNLESS OTHERWISE SPECIFIED HEREIN, REFERENCED DOCUMENTS SHALL BE THE ISSUE IN EFFECT ON DATE OF MANUFACTURE, HOWEVER, EXISTING MATERIAL INVENTORY CERTIFIED TO A PREVIOUS REVISION OF THE APPLICABLE MATERIAL SPECIFICATIONS) IS ACCEPTABLE FOR USE UNTIL DEPLETION. PROCUREMENT SPECIFICATION: 'NAO026, SHEAR AND FATIGUE TESTING ARE NOT REQUIRED. “TABLE I ~ NOMINAL LENGTHS. a £ a é i nea meoasner & cope [MIN [MAX a 016 | 004 022 is (020 | 004 | 028 5 ‘025 | 006 —|~036 2 030) (006 | 042. é a t 050] “010070 #, 060, 012, 084 i 100_| 01g | “140 ak, u i z RESTON Z 2 z @ compuerey revised NA0070 ‘SET ot sans vo IE AEG RAE UPON TS OOCLNT OR AY CIGAAL AROSPICESABAARISENERIRWOUTARY. sn eS WOH Guar ses Ok CRT ‘GN et bE CT ns oacto ones rou eRe FmaKAD aN ga TO a ‘Sera ra ENB FORA ARTEDAONAPLIOTION OR OTe ESTEACE OF OF APRIL RETOS Pes SEMES TaeT