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Gear Nomenclature Nomenclature Gear Gear Nomenclature Racks Bevel Gears Spur Gears B Bevel Gear, Cast Iron S Steel B Pinion, Steel TS Steel, 20° BS Bevel Gear, Steel C Cast Iron BS Pinion, Steel TC Cast Iron, 20° H Hardened Teeth Notes: NM Non-Metallic B steel pinions may run with BS gear of same ratio. R Steel ANY RATIO OTHER THAN 1:1. RA Steel, Heavy Backing Examples: Pinion and driven gear have S620 Steel 6DP 20T 14½°PA TR Steel, 20°, Heavy Backing different number of teeth. R20 Steel, 20°, Wide Face TS620 Steel 6DP 20T 20°PA C660 Cast 6DP 60T 14½°PA Examples: Examples: S620H Steel 6DP 20T Hardened 14½°PA R6X2 14½° STD Backing 6DPX2' Long B1040-2 Cast 10DP 40T 2:1 Ratio NM620 Non-Metallic 6DP 20T 14½°PA RA6X4 14½° Heavy Backing 6DPX4' Long B1020-2 Steel 10DP 20T 2:1 Ratio S612BS1 Steel 6P 12T 1" Bore KW SS TR6X6 20° STD Width 6DPX6' Long BS1040-2 Steel 10DP 40T 2:1 Ratio TS816BS7/8 Steel 8DP 16T 20°PA .875 Bore KW SS R206X6 20° Wide Face 6DPX6' Long BS1020-2 Steel 10DP 20T 2:1 Ratio BS1020-2 Steel 10DP 20T 2:1 Ratio Miter Gears Worm Worm Gear M Miter — Steel Gears W Steel W Worm, Steel A or B Larger Bore (Suffix) WH Steel With Hub WH Worm, Steel w/Hub HM Miter-Hardened Teeth Projection Projection K KW & SS WG Steel Hardened WG Worm, Steel Hardened Ground Threads Ground Threads Notes: WHG Steel Hardened Ground Threads WHG Worm, Steel Hardened ALWAYS 1: 1 RATIO. With Hub Projection Ground Threads Same number of teeth on each mating gear. D or Q (Suffix) Double or Quadruple Thread With Hub Projection Examples: D or Q (Suffix) Double or M824 Steel 8DP 24T Examples: Quadruple Thread M824A Steel 8DP 24T Larger Bore W6 Steel 6DP Right Hand M2424BR Brass 24DP 24T WH6 Steel w/Hub Projection 6DP Right Hand Worms and worm gears come standard as right hand. If left hand is needed, it must be specified. HM1020 Steel-Hardened Teeth 10DP 20T WG6 Steel-Hardened Ground Threads 6DP HMK1020 Steel-Hardened 10DP 20T w/KW & SS Right Hand Examples: WHG6 Steel w/Hub Projection Hardened Ground W660 Cast Iron 6DP 60T Right Hand Threads 6DP Right Hand WB660 Bronze 6DP 60T Right Hand W6D Steel 6DP Double Thread Right Hand W660D Cast Iron 6DP 60T Double Thread Right Hand Typical Spur Gear Nomenclature Common Formulas Pressure Angle With Set Screw Circular Pitch 20º T S 3 24 H 2 KW SS With Key Way Material ADDENDUM Bore OUTSIDE S Steel PITCH DIAMETER C Cast Steel DIAMETER NM Non-Metallic Hardened Teeth Diametral Pitch (DP) # of Teeth WHOLE DEPTH WORKING DEPTH DEDENDUM BOTTOM OR Information Needed to Quote Gears ROOT DIAMETER CLEARANCE FACE 1. Pitch (3DP, 4DP, 2CP, etc.) CP Circular Pitch N + 2 N 2. Number of teeth OD = DP = DP PD N Number of Teeth 3. Pressure angle (141/2°, 20°, etc.) DP Diametral Pitch 3.1416 4. Face width CP = Pitch Diameter DP PD 5. Material (1144, 1040, 4140, etc.) OD Outside Diameter PD (Dr) + PD (Dn) HUB 6. Hardened teeth? CD = CD Center Distance O.D. 2 7. Style of gear (A, B, C) Dr Driver Module 25.4 N Large 8. Hub thru diameter = Ratio = Dn Driven 9. Length through bore or hub projection Pitch DP N Small SIZING EXAMPLE: 10. Bore Gear with 46 teeth has Worm N in Worm Gear an OD of 6" HUB 11. Key way size = PROJ. Ratio # Leads 48 + 2 12. Number and size of set screw(s) DP = DP = 8 6 13. Special features www.martinsprocket.com - 817 258 3000 Copyright® 2016 Martin Sprocket & Gear, Inc. • All Rights Reserved • CARD-GEAR 0105.
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