FASTENERSFASTENERSBYBY

ROB SHAFFERROB SHAFFER

JAMES BURROWSJAMES BURROWS

OBJECTIVEOBJECTIVE

EXPLAIN THE USE OF:EXPLAIN THE USE OF:►MACHINE SCREWS AND NUTSMACHINE SCREWS AND NUTS►MACHINE SCREWS AND INSERTSMACHINE SCREWS AND INSERTS►SELF THREADING/CUTTING SCREWS SELF THREADING/CUTTING SCREWS

AND PLASTIC BOSSAND PLASTIC BOSS►THREAD FORMING SCREWSTHREAD FORMING SCREWS

PRESENTATION RESULTSPRESENTATION RESULTS

►UNDERSTAND USE OF FASTENERSUNDERSTAND USE OF FASTENERS►UNDERSTAND DIFFERENT TYPESUNDERSTAND DIFFERENT TYPES►APPLICATIONSAPPLICATIONS

MACHINE SCREWS, NUTS AND MACHINE SCREWS, NUTS AND WASHERSWASHERS

► USE WHERE APPEARANCE IS NOT USE WHERE APPEARANCE IS NOT CRITICALCRITICAL

►HOLES CAN BE COUNTERSUNK HOLES CAN BE COUNTERSUNK ►DEFLECTION, CYLENDRICAL BOSSES DEFLECTION, CYLENDRICAL BOSSES ►HEX SHAPE CAN BE MOLDED INTO PARTHEX SHAPE CAN BE MOLDED INTO PART

MACHINE SCREWS, NUTS MACHINE SCREWS, NUTS AND WASHERSAND WASHERS

►DISADVANTAGESDISADVANTAGES MANY PARTS REQUIRED FOR ASSEMBLYMANY PARTS REQUIRED FOR ASSEMBLY ACCESS TO BOTH TOP AND BOTTOM OF ACCESS TO BOTH TOP AND BOTTOM OF

PARTPART LOCKING WASHERS LOCKING WASHERS

DISADVANTAGES OFDISADVANTAGES OFMACHINE SCREWS, NUTS AND WASHERSMACHINE SCREWS, NUTS AND WASHERS

►ROTATION MOTION ROTATION MOTION ►REMOVED FOR RECYCLING OR REMOVED FOR RECYCLING OR

GRANULATION PURPOSESGRANULATION PURPOSES

MACHINE SCREWS, NUTS AND MACHINE SCREWS, NUTS AND WASHERSWASHERS

►ADVANTAGESADVANTAGES DURABLE ASSEMBLY DURABLE ASSEMBLY EASILY DISASSEMBLEDEASILY DISASSEMBLED EASILY REASSEMBLEDEASILY REASSEMBLED

MACHINE SCREWS WITH A MACHINE SCREWS WITH A THREADED METAL INSERTTHREADED METAL INSERT

► INSERT MOLDINGINSERT MOLDING►PLASTIC FORMS AROUND INSERTPLASTIC FORMS AROUND INSERT►NURELED AROUND DIAMETER FOR NURELED AROUND DIAMETER FOR

SLIPPINGSLIPPING

MACHINE SCREWS WITH A MACHINE SCREWS WITH A THREADED METAL INSERTTHREADED METAL INSERT

►ADVANTAGESADVANTAGES FEWER PARTS REQUIRED FOR FEWER PARTS REQUIRED FOR

ASSEMBLYASSEMBLY INSERTS INTRODUCED DURING OR INSERTS INTRODUCED DURING OR

AFTER MOLDINGAFTER MOLDING GOOD OVERALL DURABILITYGOOD OVERALL DURABILITY REPEATED ASSEMBLYREPEATED ASSEMBLY

PLASTIC MACHINE SCREWSPLASTIC MACHINE SCREWS

► IDEAL CHEMICAL RESISTANCE IDEAL CHEMICAL RESISTANCE APPLICATIONSAPPLICATIONS

►MATERIALS: MATERIALS: NylonNylon AcetalAcetal PolyproPolypro polyimidepolyimide

►AVALIABLE IN STANDARD MACHINE AVALIABLE IN STANDARD MACHINE THREADSTHREADS

SELF THREADING SCREWSSELF THREADING SCREWS

►FEWER PARTS REQUIREDFEWER PARTS REQUIRED►THREADS FORMED DURING ASSEMBLYTHREADS FORMED DURING ASSEMBLY►MIN. FASTENER AND EQUIP. COSTMIN. FASTENER AND EQUIP. COST►LIMITED DURABILITYLIMITED DURABILITY►REPEATED ASSEMBLY LIMITEDREPEATED ASSEMBLY LIMITED

SELF THREADING SCREWSSELF THREADING SCREWS

►ELIMINATES METAL NUT MEMBERELIMINATES METAL NUT MEMBER►RECEIVING THREADS RECEIVING THREADS

SELF THREADING TERMSSELF THREADING TERMS

►DESTRUCTION TORQUE: DESTRUCTION TORQUE: torque required to cause failuretorque required to cause failure

►SEATING TORQUE: SEATING TORQUE: torque needed to attain the desired clamp torque needed to attain the desired clamp

loadsloads

►STRIP TORQUE: STRIP TORQUE: torque that would cause the nut threads torque that would cause the nut threads

to failto fail

SELF TAPPING SCREWSSELF TAPPING SCREWS

►CUT OR TAP THEIR OWN THREADSCUT OR TAP THEIR OWN THREADS►SLASHED CUTTING SLOT SLASHED CUTTING SLOT

THREAD FORMING SCREWSTHREAD FORMING SCREWS

►NO CUTTING CAPABILITIESNO CUTTING CAPABILITIES►DISPLACE MATERIALDISPLACE MATERIAL

SCREW FASTENERSSCREW FASTENERS

►ADVANTAGESADVANTAGES HIGHER PULL OUT FORCE HIGHER PULL OUT FORCE DISASSEMBLY IS EASIER DISASSEMBLY IS EASIER CAN BE REASSEMBLED EASILYCAN BE REASSEMBLED EASILY

SCREW FASTENERSSCREW FASTENERS

►DISADVANTAGESDISADVANTAGES HAS GREAT IMPACT ON RECYCLING HAS GREAT IMPACT ON RECYCLING EASILY REMOVED FOR RECYCLINGEASILY REMOVED FOR RECYCLING

SPEACIAL THREAD SPEACIAL THREAD FORMING AND FORMING AND

THREAD CUTTING THREAD CUTTING SCREWSSCREWS

PLASTITE SCREWPLASTITE SCREW

►NON CIRCULAR TRILOBAL CROSS NON CIRCULAR TRILOBAL CROSS SECTIONSECTION

►DESIGN REDUCES DRIVING TORQUEDESIGN REDUCES DRIVING TORQUE► IDEAL FOR VIBRATION APPLICATIONSIDEAL FOR VIBRATION APPLICATIONS►COLD FLOW LOCKS SCREW INTO COLD FLOW LOCKS SCREW INTO

PLACEPLACE

PLASTITE SCREWPLASTITE SCREW

PT SCREWPT SCREW

►WIDE SPACED SINGLE LEAD THREADWIDE SPACED SINGLE LEAD THREAD►30 DEGREE ANGLE OF FLIGHTS30 DEGREE ANGLE OF FLIGHTS►REDUCED RADIAL AND HOOP STRESS REDUCED RADIAL AND HOOP STRESS ►MODIFIED SHANKMODIFIED SHANK

PT-SCREWSPT-SCREWS

POLY FAST SCREWPOLY FAST SCREW

► 35 DEGREE LEADING EDGE 35 DEGREE LEADING EDGE ► 10 DEGREE TRAILING EDGE10 DEGREE TRAILING EDGE► SUITABLE FOR USE WITH MORE DUCTILE SUITABLE FOR USE WITH MORE DUCTILE

PLASTICSPLASTICS

HiLo SCREWHiLo SCREW

►DOUBLE LEAD SCREWDOUBLE LEAD SCREW► THREAD FORMING AND THREAD CUTTINGTHREAD FORMING AND THREAD CUTTING►HIGH THREAD (30 DEGREE ANGLE)HIGH THREAD (30 DEGREE ANGLE)► LOW THREAD (60 DEGREE ANGLE)LOW THREAD (60 DEGREE ANGLE)►DRIVE TORQUES ARE LOWDRIVE TORQUES ARE LOW► 30 DEGREE ANGLE 30 DEGREE ANGLE

REDUCES RADIAL PRESSURESREDUCES RADIAL PRESSURES REDUCES TENDANCY FOR BOSS CRACKINGREDUCES TENDANCY FOR BOSS CRACKING

CONCLUSIONCONCLUSION

►CONNECTING MATING PARTSCONNECTING MATING PARTS►RECYCLING CONSIDERATIONSRECYCLING CONSIDERATIONS►DESIGN CONSIDERATIONSDESIGN CONSIDERATIONS

VIBRATIONVIBRATION PULLOUT FORCE PULLOUT FORCE DEFLECTIONDEFLECTION

THE ENDTHE END