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Self- Tapping ScrewsHead Style Reference Chart . 2Thread & Hole Dimensions; Mechanical andPerformance Requirements (continued)Drive Types Reference Chart . 3Hole Size Data . 4-5Head & Drive DimensionsBugle . 6Pan . 682o Flat . 7Flat Undercut . 8Oval . 9Oval Undercut . 10Round . 11Round Washer . 11Truss . 12Wafer . 12Hex . 13Hex Washer . 13Square Flat . 14Square Pan . 14Torx Pan . 15Combination Pan . 15Torx Flat . 16Thread Cutting Screws (continued)Type 23 . 24Type 1 . 25Type F . 26Type F Floorboard . 27Thread Rolling ScrewsPlastite . 28Taptite II . 29-33Self Drilling ScrewsType BSD . 34-35Type CSD . 34-35#4 & #5 Point . 36With Neo-EPDM Washer . 37Wafer Phillips H-L w/Spade Point . 38Wafer Phillips w/Drill Point . 39Modified Truss . 40Drive Screws . 41Self Piercing ScrewsHex Washer . 42With Neo-EPDM Washer . 43Heat Treating Notes . 16Particle Board Screws . 44Thread & Hole Dimensions; Mechanical andPerformance RequirementsThread Forming ScrewsType A . 17Type AB . 18Type AB Serrated Hex Washer . 19High Low . 20-21Type B . 22Thread Cutting ScrewsType 25 . 23Drywall ScrewsCoarse Thread . 44Fine Thread . 45High-Low . 46Trim Head . 47Deck Screws . 48-49Framing Screws . 50 Torx is a registered trademark of the Camcar Corporation, division of Textron Industries. Taptite II and Plastite are registered trademarks of REMINC (Research Engineering & Manufacturing Inc.)1
Self-Tapping ScrewsSchematic2Head StylesHeadStyleDescriptionApplications/ AdvantagesBugleA countersunk head with a flat top surface and aconcave underhead bearing surface.Designed specifically for use in drywall. Distributesbearing stress over a wider area than flat heads.PanSlotted pan heads have a flat or gently rounded topsurface, cylindrical sides and a flat bearing surface.Phillips, Torx and square pan heads have a roundedtop surface, cylindrical sides and a flat bearingsurface.For general applications. Can be substituted in mostapplications for round, truss or binding heads.Flat 82 A countersunk head with a flat top surface and acone-shaped bearing surface with a head angle ofapproximately 82 .Used in applications where protrusion of the fastenerabove the mating surface is unacceptable. Use aprotrusion gage when measuring head height.FlatUndercutSimilar to an 82 flat head except that the head isundercut to 70% of its normal side height.Standard for short lengths because it allows greaterlength of threads. Also avoids transition fillet andassembly interference.Indented HexHas an indented top surface, six flat sides, and a flatbearing surface.Preferred in high volume assembly where pneumaticequipment is used to drive the screw. Can transmitsignificantly higher tightening torque levels than otherhead styles.Indented HexWasherHas an indented top surface, six flat sides with a flatwasher which projects beyond the sides and providesa flat bearing surface. The washer and hex head areformed together as one piece.Increased bearing area reduces likelihood of crushingmating surfaces.Serrated HexWasherSame as an Indented Hex Washer head but withserrations formed into the bearing surface on theunderside of the washer.Serration geometry is oriented to resist loosening.Also slows the screw at the point of engagement withthe mating piece of sheet metal so as to minimizestripping.TrussHas a low rounded top with a flat bearing surfacegreater in area than a round-head screw of the samenominal size.Weaker than pan or round heads but preferred inapplications where minimal clearance exists above thehead. Truss profile provides a trim, finishedappearance.WaferA countersunk head with a flat top surface and acone-shaped bearing surface. The wafer's 70 conical underhead area does not extend to the outeredge of the head, providing a bearing surface of 16 around the circumference of the underhead.Preferred head style for Type-CSD self-drilling screws.Provides the necessary bearing surface and flush fit inwood and softer materials. The head/shank filletcontoured to strengthen the underhead area.OvalA countersunk head with a rounded top surface and acone-shaped bearing surface of approximately 82 .Preferred over a flat head in conical applications, orwhen a more decorative finished look is desired. Thecountersunk surface nests into mating countersunkapplication sites.OvalUndercutSimilar to an 82 oval head except that the head isundercut to 70% of its normal side height.Standard for short lengths because it allows greaterlength of threads.Round(U-drive)Has a semi-elliptical top surface and a flat bearingsurface.Standard head style for drive screws. Providesefficient non-torque fastening for high-speedassembly.
Self- Tapping ScrewsDrive TypesDRIVE TYPES FOR SELF-TAPPING SCREWSSchematicDrive TypeUsesPhillipsMost recommended drive type. Providesgood control in driving. Always use a driverbit of the proper size which is in goodcondition.SlottedAccepts standard blade screwdriver.Requires less downward pressure to driveparts than those with recessed openings.Use proper fitting blade to minimize slippage.Combination: Phillips/SlottedAccepts phillips and standard bladescrewdrivers. Often used when fastener isexpected to be driven and backed-out severaltimes.Hex / Slotted-HexAccepts hex wrench. Slotted drive is addedto make it easier to remove the fastener.Torx Positive-engaging, fast-locating method whichtransmits drive torque with less requireddownward pressure. Good fasteningappearance.SquareIncreases productivity with excellent torquetransmission and resists cam-out. Distinctiveappearance which discourages tinkering.Pozidriv -Alternative(Type 1A)Design offers even greater control in drivingthan Phillips drive. Used in automotive andappliance manufacturing. Torx is a registered trademark of the Camcar Corporation, division of Textron Industries. Pozidriv is a registered trademark of the Phillips Screw Company. Kanebridge Type-1A drive fasteners are not manufactured by or connected with the producersof Pozidriv screws.3
Self-Tapping ScrewsTypes A,AB, B, 25Hole Size DataABBA25S UGGESTED TEST P LATE THICKNESSES & HOLE SIZESFOR TYPES AB - B - 25NominalScrewSize &No. ofThreadsper InchThicknessHole 43/16.1905.18455.5 184521/64.3281SUGGESTED HOLE SIZESNominal ScrewSizeFORTYPE AClosest Drill Size to Mean HoleDiameterDrill SizeHole 24-911/320.3438Notes Regarding Hole Preparation: Preformed holes can be drilled, cored, punched, pierced or extruded. If edge burrs can cause assemblydifficulty, they should be removed. Wall ovality and/or taper can affect load carrying ability. “Minimum torsional strength” is the torque that free standing screws must accept without evidence ofdamage or failure.4
Types 1, 23, F,U & High-LowHole Size DataSelf- Tapping ScrewsType UDrive ScrewType 1RECOMMENDED HOLE SIZES--TYPE-U DRIVE SCREWSType 23Type FSuggested Test Plate Thicknesses & Hole Sizes forTypes 1, 23 & FThread Cutting ScrewsNominalScrewSize 16.3780.3720T0.3580ThicknessHole SizePlastite - See p. 28Taptite II - See pp. 30 - 33Screw SizeDrill Size No.Hole 6827.1441020.1611211.191142.221HighLowS UGGESTED HOLE SIZES -- HIGH-LOW SCREWSPilot Hole DiameterFlexural Modulus of PlasticNominal ScrewSize & Numberof Threads perInchUp to 128510-16.1360.144012-16.1570.16601/4-15.1890.2010 Taptite II and Plastite are registered trademarks of REMINC (Research Engineering & Manufacturing Inc.)5
Bugle& PanHead DimensionsSelf-Tapping ScrewsHRDASAIBUGLE HEADS FOR DRYWALL, PARTICLE BOARD & DECK S ips Recess eRecessDriverSizeSquare DriveRecess 642NOTE: There is no single standard for Bugle head dimensions. These values are offered as a guide; deviations from these specifications may occur.AMAJNTHH1SlottedGPhillipsP AN HEADS FOR S ELF-TAPPING AND DRILLING SCREWSANominalSize6HHeadDiameterH1JTWidth of SlotDepth of SlotMHeight of HeadSlottedANSI B18.6.4GNDimensions of 12.195.261.244.094.081.124.100.389.376.233.0654
Self- Tapping ScrewsHead Dimensions82 FlatAMAAminFNEdge of head maybe rounded or flatAM80 82 ProtrusiongageJNTHGRSlottedPhillipsASME B18.6.41998FLAT HEADS FOR SELF-TAPPING SCREWSNominalSizeTheseLengths orShorter areUndercutAHJHead DimensionsDiameterHeightTMSlot DimensionsWidthRNFGPhillips Dimensions Protrusion AboveDepthGaging .094.081.106.070.386.234.065.065.039.6534TypesA & /16.162.144.051.
PAN HEADS FORSELF-TAPPING ANDDRILLINGSCREWS ANSI B18.6.4 Nominal Size A H H1 J T M G N Phillips Driver Size Head Diameter Height of Head Width of Slot Depth of Slot Dimensions of Recess Slotted Recessed Diameter Depth Width Max Min Max Min Max Min Max Min Max Min Max Min Max Min 2 .167 .155 .053 .045 .062 .053 .031 .023 .031 .022 .104 .091 .059 .File Size: 540KBPage Count: 50
