Spur Gears - Norfolk Bearings and Supply Company, Inc.

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Section Contents Sprockets ROLLER CHAIN DRIVES General Description ..................................................................................................................258-259 Horsepower Ratings Charts.....................................................................................................260-262 Selection Charts........................................................................................................................263-265 MINIATURE CHAIN SPROCKETS Catalog Number Selections/Dimensions .......................................................................................266 ROLLER CHAIN SPROCKETS Catalog Number Selections/Dimensions................................................................................267-289 BLOCK CHAIN SPROCKETS Catalog Number Selections/Dimensions .......................................................................................290 LADDER CHAIN SPROCKETS Catalog Number Selections/Dimensions................................................................................291-292 ROLLER CHAIN DRIVE TENSIONERS Catalog Number Selections/Dimensions................................................................................293-296 IDLER SPROCKETS Catalog Number Selections/Dimensions .......................................................................................293 P-1930-BG 04/10 Boston Gear 800-825-6544 257 H
H Chain Drives Roller Chain Sprockets Types and Styles Type A – No Hub Boston standard Type A sprockets are stocked for all single strand Roller Chains up to 1" Pitch (#80 Chain). Type B – Single Hub Boston Steel—Type B Stock Bore sprockets are stocked for all single strand Roller Chains up to 1" Pitch (#80 Chain) and for double strand Roller Chains in 3/8, 1/2, 5/8 and 3/4" Pitches. Boston Stainless Steel—Type B Stock Bore sprockets are stocked for single strand Roller Chain in 1/4, 3/8, and 1/2" pitches. Boston Steel—Type B Bored-to-Size sprockets are stocked for single strand Roller Chain in 1/4, 3/8, 1/2, 5/8, 3/4, and 1" pitches. Roller Chain Drive Selection The following considerations are very important in the selection and application of roller chain drives: HORSEPOWER RATINGS—This catalog lists Horsepower Ratings for ANSI Series, single pitch, single strand chains No. 25 through No.160 (and lightweight machinery series No. 41). Ratings are listed for various numbers of teeth and speeds of smaller sprocket. Ratings for intermediate numbers of teeth or RPM may be determined by interpolation. The ratings reflect a service factor of 1, a chain length of approximately 100 pitches, the use of recommended lubrication methods and a drive arrangement where two aligned sprockets are mounted on parallel horizontal shafts. For maximum service life, sprockets with small numbers of teeth, operating at moderate to high speeds or near the rated horsepower should have hardened teeth. Approximately 15,000 hours of service life at full load operation may be expected under these conditions. Boston roller chain sprockets are quality designed and built to ANSI specifications for superior fatigue resistance and long operational life in a host of industrial and process applications. Sprockets are available in a wide range of materials and pitches, with or without hubs. Boston Type B sprockets are solid (one piece) construction in small sizes, and two-piece design in larger numbers of teeth, see Chart. Pitch Solid Two-Piece Size up to starting at 25 25B30 25B32 35 35B25 35B26 41 41B20 41B21 40 40B20 40B21 50 50B16 50B17 60 60B16 60B17 80 80B14 80B15 NO. OF TEETH—It is good practice to select a pinion sprocket with no less than 17 Teeth, to assure 120° of chain wrap and minimize overhung load. However, certain conditions, i.e., space limitations, light loads, intermittent duty, etc. will permit the use of smaller pinions. RATIO—Sprocket ratios should not exceed about 6 to 1 for normal chain life. HARDENED TEETH—Boston Gear steel sprockets can be hardened. Consult the factory for recommended procedure. CENTER DISTANCE—The correct center distance is very important. In designing chain drives, it is important that the Center Distance should be long enough to provide at least 120° of chain wrap on the smaller sprocket. RELATIVE SHAFT LOCATIONS—It is desirable that the line between the two shaft centers be as nearly horizontal as possible. If this line is more than 60° from the horizontal, special precautions should be taken. 258 Boston Gear 800-825-6544 P-1930-BG 04/10
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A L T R A I N D U S T R I A L M O T
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Table Of Contents Stock Altered and
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With thousands of stock gears avail
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Custom Gearing “Request For Quota
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Custom Gearing Capabilities Gear Ty
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Gear Selection Stock Gears Spur Gea
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Product Selection / Reference Guide
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Boston Gear Helical Gears ■ Paral
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Boston Gear Worms and Worm Gears
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A Spur Gears 48 and 32 Diametral Pi
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A Spur Gears 10 and 8 Diametral Pit
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A Spur Gears 6 and 5 Diametral Pitc
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A Change Gears 20 Diametral Pitch (
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A Change Gears 12 Diametral Pitch (
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A Change Gears 8 Diametral Pitch (S
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A Drawn Pinion Wire 48, 32 and 24 D
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A Internal Gears 48 through 16 Diam
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A Spur Gears 48 Diametral Pitch (De
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A Spur Gears 32 Diametral Pitch (De
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A Spur Gears 6 and 5 Diametral Pitc
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A Internal Gears 64 through 24 Diam
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A Spur Gears Approximate Horsepower
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B Helical Gears 24 through 10 Trans
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B Helical Gears Selection Procedure
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B Helical Gears Approximate Horsepo
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C Miter Gears 48 through 20 Diametr
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C Miter Gears 8 through 4 Diametral
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C Bevel Gears 48 through 20 Diametr
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C Bevel Gears 12 and 10 Diametral P
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C Spiral Bevel Gears 30 through 8 D
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C Miter Gears Steel & Iron - Straig
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C Bevel Gears Steel & Iron - Straig
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C Notes 84 Boston Gear 800-825-6544
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D Worms & Worm Gears 48 Diametral P
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D Worms & Worm Gears 8 Diametral Pi
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D Worms & Worm Gears 4 Diametral Pi
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D Worms & Worm Gears Selection Proc
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D Worms & Worm Gears Steel-Hardened
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E Shaft Couplings FC Series Insert
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E Shaft Couplings BF Series Bost-Fl
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E Shaft Couplings SCC Series Clampi
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E Shaft Couplings FCP Series Sleeve
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E Universal Joints J/JS Series Bore
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E Universal Joints UJNS/UJNL Series
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E Universal Joints JP Series Single
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E Setscrew Collars SC/SSC Series St
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E Clamping Collars CSC/CSSC/CASC Se
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E Thrust Washers Steel and Stainles
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E Grooved Pulleys G1200 Round Belt
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E Miniature Timing Belts and Pulley
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E Miniature HTD ® Timing Belts 3M
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E Timing Belt Pulleys PA Series For
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E Timing Belt Pulleys PLB Series Fo
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E Miniature HTD ® Timing Belts 5M
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E Timing Belt Pulleys PA Series For
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E Timing Belt Pulleys PLB Series Fo
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F BOST-BRONZ Oil-Impregnated Sinter
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F BEAR-N-BRONZE 660 Cast Bronze Bea
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F Bronze Bearing Emergency Banks Ac
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F BOStonE F-1 Glass Filled Teflon B
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F RULON ® 641 Bearings Boston Gear
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F BOStonE Molded Plastic Bearings B
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F BOStonE Molded Plastic Bearings R
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F BOStonE Molded Plastic Bearings G
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F BOStonE Molded Nylon Bearings Pla
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F Engineering Information Sleeve Be
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F Engineering Information Sleeve Be
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F Engineering Information Lubricati
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F Engineering Information Shaft Cle
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F Engineering Information Machining
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F Anti-Friction Bearings Ball Beari
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F Anti-Friction Bearings 1600 Serie
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F Anti-Friction Bearings Flanged 40
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F Anti-Friction Bearings 600 Series
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F Self-Aligning Bearings KF Female
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F Self-Aligning Bearings CMHD Male/
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F Self-Aligning Bearings HME Male/H
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F Self-Aligning Bearings LHA-LHB-LH
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Page 213 and 214: F Engineering Information Engineeri
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Page 217 and 218: F Mounted Bearings Replacement Bear
Page 219 and 220: F Mounted Bearings Replacement Bear
Page 221 and 222: F Mounted Ball Bearings PS Series P
Page 223 and 224: F Mounted Ball Bearings L/H Series
Page 225 and 226: F Mounted Ball Bearings SL/SH Serie
Page 227 and 228: F Mounted Ball Bearings MB Series P
Page 229 and 230: F Mounted Ball Bearings XL2/XL3 Ser
Page 231 and 232: F Mounted Ball Bearings F/T Series
Page 233 and 234: F Mounted Ball Bearings SF/ST Serie
Page 235 and 236: F Mounted Ball Bearings MBP Series
Page 237 and 238: F Mounted Bearings TU Series Take-U
Page 239 and 240: F Engineering Information Analysis
Page 241 and 242: F Engineering Information Mounted B
Page 243 and 244: F Engineering Information Applicati
Page 245 and 246: F Notes 240 Boston Gear 800-825-654
Page 247 and 248: G Roller Chains Description of Roll
Page 249 and 250: G Roller Chains ANSI Standard Doubl
Page 251 and 252: G Engineering Information Conveyor
Page 253 and 254: G Engineering Information Conveyor
Page 255 and 256: G Notes 250 Boston Gear 800-825-654
Page 257 and 258: G Roller Chains Hollow Pin Single a
Page 259 and 260: G Ladder Chain Steel-Stainless Stee
Page 261: G Chain Pullers Chain Breaking Tool
Page 265 and 266: H Roller Chain Drives Horsepower Ra
Page 267 and 268: H Roller Chain Drives Horsepower Ra
Page 269 and 270: H Roller Chain Drives Selection SPE
Page 271 and 272: H Miniature Chain Sprockets Single
Page 273 and 274: H Roller Chain Sprockets Single Str
Page 295 and 296: H Block Chain Sprockets Type B Sing
Page 297 and 298: H Ladder Chain Sprockets Type B Sin
Page 299 and 300: H Roller Chain Drive Tensioners Typ
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Page 303 and 304: I Engineering Information Spur Gear
Page 309 and 310: I Engineering Information Helical G
Page 311 and 312: I Engineering Information Helical G
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I Engineering Information Miter and
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I Engineering Information Worms and
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I Engineering Information Couplings
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I Engineering Information General M
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I Engineering Information Sprockets
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I Engineering Information Sprocket
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I Engineering Information Temperatu
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I Engineering Information Metric Co
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I Engineering Information Applicati
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I Index to Catalog Numbers Catalog
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I Index to Catalog Numbers Catalog
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Altra Industrial Motion All Custome
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