91430 SPS cover edited - Electronic Fasteners Inc

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THROUGH-HOLE PREPARATIONClose Fit: Normally limited to holes for those lengths ofscrews threaded to the head in assemblies in which: (1)only one screw is used; or (2) two or more screws areused and the mating holes are produced at assembly orby matched and coordinated tooling.Normal Fit: Intended for: (1) screws of relatively longlength; or (2) assemblies that involve two or more screwsand where the mating holes are produced by conventionaltolerancing methods. It provides for the maximumallowable eccentricty of the longest standard screws andfor certain deviations in the parts being fastened, such asdeviations in hole straightness; angularity between theaxis of the tapped hole and that of the hole for the shank;differneces in center distances of the mating holes andother deviations.Chamfering: It is considered good practice to chamfer orbreak the edges of holes that are smaller than “F” maximumin parts in which hardness approaches, equals orexceeds the screw hardness. If holes are not chamfered,the heads may not seat properly or the sharp edges maydeform the fillets on the screws, making them susceptibleto fatigue in applications that involve dynamic loading.The chamfers, however, should not be larger thanneeded to ensure that the heads seat properly or that thefillet on the screw is not deformed. Normally, the chamfersdo not need to exceed “F” maximum. Chamfersexceeding these values reduce the effective bearing areaand introduce the possibility of indentation when theparts fastened are softer than screws, or the possiblity ofbrinnelling of the heads of the screws when the parts areharder than the screws. (See “F” page 6).A X C hole dimensionsdrill size for hole Abasiccounter- countersink tap drill size **body counternominalscrewclose fitnormal fitbore diameter D drill boresize diameter nom. dec. nom. dec. diameter Max. + 2F(Max.) UNRC UNRF size size0 0.0600 51* 0.0670 49* 0.0730 1/8 0.074 – 3/64 #51 1/81 0.0730 46* 0.0810 43* 0.0890 5/32 0.087 1.5mm #53 #46 5/322 0.0860 3/32 0.0937 36* 0.1065 3/16 0.102 #50 #50 3/32 3/163 0.0990 36* 0.1065 31* 0.1200 7/32 0.115 #47 #45 #36 7/324 0.1120 1/8 0.1250 29* 0.1360 7/32 0.130 #43 #42 1/8 7/325 0.1250 9/64 0.1406 23* 0.1540 1/4 0.145 #38 #38 9/64 1/46 0.1380 23* 0.1540 18* 0.1695 9/32 0.158 #36 #33 #23 9/328 0.1640 15* 0.1800 10 0.1935 5/16 0.188 #29 #29 #15 5/1610 0.1900 5* 0.2055 2* 0.2210 3/8 0.218 #25 #21 #5 3/81/4 0.2500 17/64 0.2656 9/23 0.2812 7/16 0.278 #7 #3 17/64 7/165/16 0.3125 21/64 0.3281 11/32 0.3437 17/32 0.346 F I 21/64 17/323/8 0.0375 25/64 0.3906 13/32 0.4062 5/8 0.415 5/16 Q 25/64 5/87/16 0.4375 29/64 0.4531 15/32 0.4687 23/32 0.483 U 25/64 29/64 23/321/2 0.5000 33/64 0.5156 17/32 0.5312 13/16 0.552 27/64 29/64 33/64 13/165/8 0.6250 41/64 0.6406 21/32 0.6562 1 0.689 35/64 14.5mm 41/64 13/4 0.7500 49/64 0.7656 25/32 0.7812 1-3/16 0.828 21/32 11/16 49/64 1-3/167/8 0.8750 57/64 0.8906 29/32 0.9062 1-3/8 0.963 49/64 20.5mm 57/64 1-3/81 1.0000 1-1/64 1.0156 1-1/32 1.0312 1-5/8 1.100 7/8 59/64 1-1/64 1-5/81-1/4 1.2500 1-9/32 1.2812 1-5/32 1.3125 2 1.370 1-7/64 1-11/64 1-9/32 21-1/2 1.5000 1-17/32 1.5312 1-9/16 1.5625 2-3/8 1.640 34mm 36mm 1-17/32 2-3/8** Break edge of body drill hole to clear screw fillet.82
DRILL AND COUNTERBORE SIZESDRILL AND COUNTERBORE SIZES FOR METRIC SOCKET HEAD CAP SCREWSA X YNominal Sizeor BasicScrew DiameterClose Fit[Note (2)]Nominal Drill SizeNormal Fit[Note (3)]CounterboreDiameterCountersinkDiameter[Note (1)]M1.6M2M2.5M3M41.802.202.703.404.401.952.403.003.704.803.504.405.406.508.252.02.63.13.64.7M5M6M8M10M125.406.408.4010.5012.505.806.808.8010.8012.809.7511.2514.2517.2519.255.76.89.211.214.2M14M16M20M2414.5016.5020.5024.5014.7516.7520.7524.7522.2525.5031.5037.5016.218.222.426.4M30M36M42M4830.7537.0043.0049.0031.7537.5044.050.0047.5056.5066.0075.0033.439.445.652.683
Page 1 and 2:
Engineering GuideInch & Metric
Page 3 and 4:
TABLE OF CONTENTSUNBRAKO ® Socket
Page 5 and 6:
INCH QUICK SELECTOR GUIDEPERFORMANC
Page 8 and 9:
SOCKET HEAD CAP SCREWS 1960 Series
Page 10 and 11:
SOCKET HEAD CAP SCREWS 1960 Series
Page 12 and 13:
FEWER HOLES TO DRILL AND TAPthree s
Page 14 and 15:
SHOULDER SCREWS Dimensions Mechan
Page 16 and 17:
FLAT HEAD SOCKET SCREWSDimensionsDe
Page 18 and 19:
FLAT HEAD AND BUTTON HEAD SOCKET SC
Page 20 and 21:
SOCKET SET SCREWS Dimensions Appl
Page 22 and 23:
SOCKET SET SCREWS Point Selection
Page 24 and 25:
SOCKET SET SCREWS Torisional and A
Page 26 and 27:
PRESSURE PLUGSDRYSEAL TYPE with 3/4
Page 28 and 29:
PRESSURE PLUGS Application DataPre
Page 30 and 31:
DOWEL PINS Dimensions Application
Page 32 and 33:
PULL-OUT DOWEL PINS Dimensions Ap
Page 34 and 35: HEX KEYS Dimensions Mechanical Pr
Page 36 and 37: THREAD CONVERSION CHARTSDIAMETER/TH
Page 38 and 39: UNBRAKO Metric FastenersUNBRAKO Met
Page 40 and 41: METRIC SOCKET HEAD CAP SCREWSDimens
Page 42 and 43: METRIC SOCKET FLAT HEAD CAP SCREWSD
Page 44 and 45: METRIC SOCKET HEAD SHOULDER SCREWST
Page 46 and 47: METRIC SOCKET SET SCREWS Knurled C
Page 48 and 49: METRIC LOW HEAD CAP SCREWSThreads:
Page 50 and 51: ISO TOLERANCES FOR METRIC FASTENERS
Page 52 and 53: CONVERSION CHARTSI UNITS & CONVERSI
Page 54 and 55: INSTALLATION CONTROLSeveral factors
Page 56 and 57: Their disadvantages are… lower te
Page 58 and 59: AN EXPLANATION OF JOINT DIAGRAMSWhe
Page 60 and 61: A s = π (D 2 H - D 2 h )Effect of
Page 62 and 63: F 1F 1Fig. 10 Force diagrams show t
Page 64 and 65: TIGHTENING TORQUES AND THETORQUE-TE
Page 66 and 67: STRIPPING STRENGTH OF TAPPED HOLESC
Page 68 and 69: THREAD STRIPPING STRENGTHIN VARIOUS
Page 70 and 71: HIGH-TEMPERATURE JOINTSBolted joint
Page 72 and 73: mine the clamping stress at assembl
Page 74 and 75: Electroplating: Two broad classes o
Page 76 and 77: GALVANIC CORROSIONMMMMMM M M M M M
Page 78 and 79: TABLE 20LOW-TEMPERATURE IMPACT PROP
Page 80 and 81: TYPICAL TENSION IMPACT STRENGTH,EFF
Page 82 and 83: THREADS IN BOTH SYSTEMSThread forms
Page 86 and 87: HARDNESS - TENSILE CONVERSIONINCHRO
Page 88 and 89: ENGINEERING PART NUMBERS - INCHUnbr
Page 90 and 91: PRESSURE PLUG PART NUMBERSBasic Par
Page 92: INDUSTRIAL FASTENERS GROUPUnbrakoTh
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91430 SPS cover edited - Electronic Fasteners Inc

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