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91430 SPS cover edited - Electronic Fasteners Inc

91430 SPS cover edited - Electronic Fasteners Inc

FLAT HEAD AND BUTTON

FLAT HEAD AND BUTTON HEAD SOCKET SCREWSMechanical PropertiesNOTESMaterial: ASTM F835 – alloy steelASTM F879 – stainlessHardness: Rc 38–43 for alloy steelRb 96–Rc 33 for stainless steelTensile Strength: 160,000 PSI min. ultimate tensile strength for alloy steel90,000 PSI min. ultimate tensile strength for stainless steelHeat Treatment: Stainless steel is in cold-worked (CW) condition unlessotherwise requested.GENERAL NOTEFlat, countersunk head cap screws and button head cap screws are designedand recommended for moderate fastening applications: machine guards,hinges, covers, etc. They are not suggested for use in critical high strengthapplications where socket head cap screws should be used.MECHANICAL PROPERTIES16ALLOY STEELSTAINLESS STEELultimateseating torqueultimate tensileseating torquesingle shearsingle shearnom.strength lbs.inch-lbs.*strength lbs.inch-lbs.*strength ofstrength ofsize UNRC UNRF body lbs. min. UNRC UNRF UNRC UNRF body lbs. min. UNRC UNRF#0 – 265 271 – 1.5 – 162 93 – 1.0#1 390 390 402 2.5 2.5 237 250 137 1.7 1.8#2 555 555 556 4.5 4.5 333 355 191 2.8 3.0#3 725 725 739 7 7 438 471 253 4.3 4.6#4 1,040 1,040 946 8 8 544 595 325 6.0 6.6#5 1,260 1,310 1,180 12 13 716 747 403 8.9 9.3#6 1,440 1,620 1,440 15 17 818 913 491 11 12#8 2,220 2,240 2,030 30 31 1,260 1,327 693 20 21#10 2,780 3,180 2,770 40 45 1,575 1,800 931 30 341/4 5,070 5,790 4,710 100 110 2,862 3,276 1,610 71 815/16 8,350 9,250 7,360 200 220 4,716 5,220 2,520 123 1363/8 12,400 14,000 10,600 350 400 6,975 7,900 3,620 218 2477/16 16,900 18,900 14,400 560 625 9,570 10,680 4,930 349 3881/2 22,800 25,600 18,850 850 1,000 12,770 14,390 6,440 532 6009/16 28,900 32,300 23,900 1,200 1,360 16,300 18,300 8,150 767 8565/8 36,000 40,800 29,450 1,700 1,900 20,300 23,000 10,100 1,060 1,2003/4 53,200 59,300 42,400 3,000 3,200 30,100 33,600 14,500 1,880 2,1007/8 73,500 81,000 57,700 5,000 5,400 41,500 45,800 19,700 3,030 3,3401 96,300 106,000 75,400 7,200 7,600 54,500 59,700 25,800 4,550 5,000*Torques values listed are for plain screws to induce 65,000 psi stress in alloy steel and 30,000 psi tensile stress in stainless steel screwthreads. For cadmium plated screws, multiply recommended seating torque by .75; for zinc plated screws multiply by 1.40.See Note, page 1.

SQUARE HEAD SET SCREWSDimensions Application DataHeat treated alloy steel formaximum strength withoutbrittleness or decarburizationFully formed threads with continuousgrain flow for greater strengthand precision fitKnurled cup point for positiveself-locking and vibration resistanceThreads per ANSI B 1.1;Handbook H-28. ANSI B18.6.2VIBRATIONAL HOLDING POWERvs. SEATING TORQUESize: 5/16”–18x1/2”GREATER TIGHTENING TORQUESof UNBRAKO Square Heads,made of high quality alloy steel,provide 50% more axial holdingpower than ordinary carbon steelsquare heads. And, because ofthe increased torque plus theKnurled Cup Point, UNBRAKOSquare Head Set Screws deliverup to 400 percent moreVibrational Holding Power.Seconds1000800600400VIBRATIONAL HOLDING POWER (Endurance)400% moreVibrationalHolding PowerUNBRAKOALLOY STEELSQUARE HEADS200CARBON STEELSQUARE HEADS(Plain Cup Point)0SEATING TORQUE (Inch Lbs.)100 200 300 400DIMENSIONS and APPLICATION DATASELF-LOCKING KNURLED CUP POINTINTERNAL OR EXTERNAL KNURLFURNISHED AT UNBRAKO OPTIONNOTESMaterial: ASTM A574 – alloy steelHeat treatment: Rc 45 min., through heat treatedThread: Class 2A.These torques are appreciably higher than socket set screw torquevalues, therefore thread stripping strength of mating materialmust be considered. (Not recommended in standard collars.)basic threads A C D F H R W recom.**nom. screw per torquesize diameter inch min. max. min. max. min. ±.010 max. min. nom. max. min. inch-lbs.#10 .190 24 .247* .102 .88 .127 .120 .045 .148 .134* 31/64 .188 .180 1001/4 .250 20 .331 .132 .118 .156 .149 .063 .196 .178 5/8 .250 .241 2125/16 .312 18 .415 .172 .156 .203 .195 .078 .245 .224 25/32 .312 .302 4203/8 .375 16 .497 .212 .194 .250 .241 .094 .293 .270 15/16 .375 .362 8307/16 .437 14 .581 .252 .232 .297 .287 .109 .341 .315 1 3/32 .437 .423 1,3501/2 .500 13 .665 .291 .270 .344 .334 .125 .389 .361 1 1/4 .500 .484 2,1009/16 .562 12 .648 .332 .309 .391 .379 .140 .437 .407 1 13/32 .562 .545 2,8505/8 .652 11 .833 .371 .347 .469 .456 .156 .485 .452 1 9/16 .625 .606 4,2503/4 .750 10 1.001 .450 .425 .563 .549 .188 .582 .544 1 7/8 .750 .729 7,7007/8 .875 9 1.170 .530 .502 .656 .642 .219 .678 .635 2 3/16 .875 .852 12,6001 1.000 8 1.337 .609 .579 .750 .734 .250 .774 .726 2 1/2 1.000 .974 16,6001 1/8 1.125 7 1.505 .689 .655 .844 .826 .281 .870 .817 2 13/16 1.125 1.096 20,8001 1/4 1.250 7 1.674 .767 .733 .938 .920 .312 .966 .908 3 1/8 1.250 1.219 25,0001 3/8 1.375 6 1.843 .848 .808 1.031 1.011 .344 1.063 1.000 3 7/16 1.375 1.342 32,0001 1/2 1.500 6 2.010 .926 .886 1.125 1.105 .375 1.159 1.091 3 3/4 1.500 1.464 44,000*#10 may have head dimensions from 1/4 nominal size furnished at Unbrako option. **See Note, page 1.LENGTH TOLERANCEup to 1” 1” to 2” 2” andDiameter incl. incl. overup to 5/8” –.03 –.06 –.093/4” and over –.06 –.12 –.1817

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