Stock Timing Pulleys - martinsprocket.com

1 K-2 Stock TimingPulleysSTOCK Timing PULLEYS1/5" - 7/8" PITCHQD, TAPER BUSHEDAND Stock BOREQDS tock BoreTaper BushedPitch (Inches)Pulley Designation1/5"XL (Extra Light)3/8"L (Light)1/2"H (Heavy)7/8"XH (Extra Heavy) Timing Pulleys are manufactured to extremely close specifications and are stocked in minimum plain bore, Taper Bushed and QD bushed styles depending on size and pitch .See tables for Stock pulley types . Bushings are priced separately and must be added to pulley price . F designation in pulley type means pulley is flanged . When drive center distance is eight times the diameter of the smaller pulley or when drive is operating on vertical shafts, both Pulleys should be flanged.

2 DEFINITION OF CATALOG NUMBERS EX: TB 20L100 TB Requires Taper Bushing 20 Number of Teeth L 3/8" Pitch (Light) 100 belt Width 1" EX: 72L100SD 72 Number of Teeth L 3/8" Pitch (Light) 100 belt Width 1" SD Requires QD Bushing EX: 16L100 Min . Plain BorePulley sizes shown stocked as Stock bore only: max . bore listed is without keyway . If keyway is used reduce max . bore by twice keyway depth .Illustrations below indicate Stock pulley construction type listed in tables .Type DFType CFType AFType DType CType KFType AType GType HType JPulley Style DesignationAs Shown in TablesDash 1 = Block Body StyleDash 2 = Web StyleDash 3 = Arm/Spoke StyleSize XXH (1-1/4" Pitch).

3 Available as made-to-order .Call your nearest facility .Let us quote your made-to-order and large quantity requirements .K-3 Timing Pulley TerminologyTiming belts and Pulleys in order to handle a wide range of loads, speeds and applications at highest possible efficiencies are made in five Stock pitches . Circular pitch (usually referred to as pitch) is a basic consideration in the selection of Timing Pulleys as with gear and chain drives . Pitch is the distance between groove centers and is measured on the pulley pitch circle . On the belt , pitch is the distance between tooth centers and is measured on the pitch line of the belt .

4 The pitch line of the belt is located within the tension member and coincides with the pitch circle of the pulley mating with it . Any Timing belt must be run with Pulleys of the same pitch . A belt of one pitch cannot be used successfully with Pulleys of a different pitch . belt PitchLinePitch (Circular Pitch) belt ToothPitch DiameterOutsideDiameterPulley GroovePitch Line DifferentialLCircular Pitch of GrooveMMinimum Depth of Groove, Including ClearanceNWidth of Groove at Minimum Depth, Including ClearanceOPressure AnglePTop Radius of GrooveRPitch Diameter (Always > S)SOutside DiameterNOMLLLLPSRLTIMING PULLEYTERMINOLOGYAP itch of TeethBDepth of TeethCWidth at Bottom of TeethDPressure AngleERadius at Bottom of TeethFRadius at Top of TeethGPitch Line DifferentialBelt P.

5 L . = A X Total No . of Teeth in BeltTIMING BELTTERMINOLOGYDBGEFACK-4 Timing PulleysTiming Pulleys have evenly spaced axial grooves cut in their periphery to make correct, positive engagement with the mating teeth of the belt . These Pulleys are designed so that the teeth of the belt enter and leave the grooves with negligible friction . All Pulleys , Stock and made-to-order, have minimum tooth-to-groove clearance (backlash) . The pulley s pitch diameter will always be greater than its outside diameter . Pulleys are available in a wide range of Stock widths and diameters .Flanged PulleysBecause Timing belts have an inherent, gentle side thrust, it is necessary to use at least one flanged pulley to prevent the belt from riding off.

6 Generally, for economy, the smaller pulley in each drive is flanged . However, when the center distance is greater than eight times the diameter of the smaller pulley on drive ratios less than 3 to 1, or when the drive is operated on other than horizontal shafts both Pulleys should be flanged . When a drive has three Pulleys , at least two should be flanged . If the drive has more than three Pulleys , every other pulley should be flanged .Pulley DiametersStock Timing belts should not be used over pulley diameters less than those recommended above without expecting some reduction in belt life . This reduced belt life is the result of flex fatigue of the steel tension members in the belt .

7 If Pulleys smaller than recommended must be used, the use of special Timing belts should be considered . Timing PulleyTerminologyMinimum Pulley DiametersPitchSpeed RPMR ecommended minimum*No . of groovesPitch (diam . in)1/5 in(XL)3500 .76412 XL1750 .63710 XL1160 .63710 XL3/8 in(L)35001 .91016 L17501 .67114 L11601 .43212 L1/2 in(H)35003 .18320 H17502 .86518 H11602 .54616 H7/8 in(XH)17507 .24226 XH11606 .68524 XH8706 .12722 XH1-1/4 in(XXH)175010 .34526 XXH11609 .54924 XXH8708 .75422 XXH*Smaller diameter Pulleys can be used if a corresponding reduction in belt service life is satisfactory .K-5 Stock TimingPulleysXL1/5" PitchXL - 1/5" PitchXL 037 For Belts 1/4" and 3/8" WideMinimum Plain BoreF = 9/16No.

8 TeethPart NumberPitch DiameterMax FL O .D .TypeBoreEHLWt .StockMax .1010XL0370 .6370 .929DF-10 .18750 .250 .21880 .43750 .78130 .031111XL0370 .7000 .929DF-10 .18750 .250 .21880 .43750 .78130 .041212XL0370 .7640 .993DF-10 .18750 .31250 .21880 .50 .78130 .061414XL0370 .8911 .120DF-10 .250 .3750 .21880 .56250 .78130 .081515XL0370 .9551 .184DF-10 .250 .43750 .21880 .62500 .78130 .091616XL0371 .0191 .248DF-10 .250 .50 .21880 .68750 .78130 .101818XL0371 .1461 .375DF-10 .250 .56250 .21880 .81250 .78130 .132020XL0371 .2731 .502DF-10 .250 .68750 .31250 .93750 .8750 .182121XL0371 .3371 .566DF-10 .250 .68750 .31250.

9 93750 .8750 .192222XL0371 .4011 .630DF-10 .250 .750 .312510 .8750 .222424XL0371 .5281 .756DF-10 .250 .81250 .31251 .06250 .8750 .252828XL0371 .7832 .011DF-10 .250 .93750 .31251 .18750 .8750 .343030XL0371 .9102 .138DF-10 .31251 .06250 .31251 .3750 .8750 .413232XL0372 .037 D-10 .31251 .18750 .43751 .510 .253636XL0372 .292 D-10 .31251 .18750 .43751 .510 .294040XL0372 .546 D-10 .31251 .18750 .43751 .510 .354242XL0372 .674 D-10 .31251 .18750 .43751 .510 .314444XL0372 .801 D-10 .31251 .18750 .43751 .510 .344848XL0373 .056 D-10 .31251 .18750 .43751 .510 .636060XL0373 .820 D-10 .3751 .18750 .43751 .510 .907272XL0374.

10 584 D-10 .3751 .18750 .43751 .510 .50 Note: XL Pulleys stocked min . plain bore with 2 setscrews @ 90 . If keyway is used, reduce max . bore by twice keyway depth .Pulley O .D . = P .D ..02" .Dash 1 = Solid Style Dash 2 = Web Style Dash 3 = Arm/Spoke Style F type description indicates flanged .Type AFType DFType EFType GFType AType DType EType GK-6 Stock TimingPulleysL3/8" PitchDash 1 = Solid Style Dash 2 = Web Style Dash 3 = Arm/Spoke StyleType CFType DFType EFType GFType HFType CType DType EType GType HType KFLL - 3/8" PitchL050 For Belts 1/2" WideMinimum Plain BoreF = 3/4No.