Imperial machine have dimensions listed in imperial units also referred to as the imperial system and are listed as ANSI - ASME standard machine keys. 3) All 8-3/4" axle shafts, 65-74, are retained by a bolt-on flange. Possesses an oval-shaped point on the end opposing the flush. 97 mm: Outside Diameter: 2. Please note that the key sizes in parentheses are older sizes that are no longer commonly used. Dimensions shown are in Inches, if you wish to convert to mm, please use our universal converter. 2515 0. Their extra depth in shaft reduces the overturning tendency in its keyway. 0005 / -. The first principle to grasp is the fit designation of the shaft /hole joint. Shaft Key Seat Depth Control Values S and T for Shaft and Hub ANSI B17. Keyway Depth Calculator answer BoreTurn Keyway Broaching Keyseating Milling Drill Tapping. 0625 0. All dimensions given in inches. Standard Metric Keys & Keyways for Metric Bores with One Key • Couplings (Page 2 of 2) All Types 427-140 Reo a 21 (P eso) oola e el 11 pesees 2 Telepoe 22 a 22 eoo Key & Keyway Dimensions – Millimeters Coupling Hub Keyway Dimensions – Inches Shaft Diameter “D” Key Size Nominal Keyway Width Hub “W” Keyway Depth Hub “T2” Parallel Metric Keys and Keyway Dimensions - Roy Mech. BS 46 Keys and keyway Dimensions-Parallel Rectangular Ref Standard . 0 degrees (1. This is our collection of frequently used reference tables for shop work. REFERENCE DEPTH. Broaches, bushings, and shims that are used together should have the same style designation. 010 Height (d) (t) - DIM Keyway Width (w) AGMA 9002-A86 Inch Bore and ANSI B17. See dimensions W and h in Figure 1. 46 : PART 1 : 1958. It is a shaft-to-shaft flexible coupling with a simple one piece design, making it ideal for indexing, robotic or positioning applications. 3MM KW : Bore Size N/A 38. 020 0. 560 in 65. Shaft Diameter. BSI Shop. Get In Touch. Engineering Information Taper Metric Key and Keyway DimensionsWOODRUFF KEY DIMENSIONS ANSI Key No. ISO 3019-1. 2020-10-13 15:10:33. 3) Keyway fillet radius to be specified by customer. Here we can calculate rigid connections, namely the pinned, keyed, splined and flanged ones. Fitting and Machining - RMIT Publishing 1977 Buyology - Martin Lindstrom 2010. 02/-0. 05 mm: Outside Diameter: 2. To confirm the status of any standard, identify the replacement standard if it is obsolete and/or purchase the standard please use. 180 in 29. com ©2004-2021 Kramer Power Equipment Co. It is different from a tapered shaft lock in that tapered keys have a matching taper on the keyway, while tapered shaft locks do not. Min. 0005 keyway and shaft dimensions b-7249 1 b b c d a. 750 in 69. BS 46 Rectangular Taper & Gib Head KeyWay & Key Dimensions All Dimensions in inches. 87 4. Hex keys, commonly known as Allen keys/wrenches in the UK and various other countries, are a very simple hand tool of the general spanner and socket family, used for tightening and loosening hexagonal bolts and other compatible fasteners. 90. 55 283 285 2. Keyway Chart Seals Specification & Size Listings. All dimensions in inches. 05″ and the precision metric sizes are 0. Bushings rest inside the arbor hole of your workpiece and act as guides to ensure rigid and accurate keyway cutting. DIN 6885-A A4. 09 mm: Outside Diameter: 6. 028″, 0. Browse Metric Set Screw Couplings w/Keyway MRC4H-Series in the Climax Metal Products Company catalog including Item #,Bore,OD,Length,Screw Size,Keyway Size,Material,Weight,CAD 800. Show results for Filters. xx 0. Keyway (Shaft. Box 12086 Omaha, NE 68112-2086 Imperial Tap Chart: Keyway Dimensions: Melting Points: Metric Tap Chart: O-Ring Sizes: Pipe. While a designer is free to specify any keyway they wish, straying from the standard option is likely to increase the cost, time, and complexity of the part. size jrc web accessories 46 passaic avenue fairfield, nj 07004 125 unless otherwise specified remove all burrs & sharp edges reference drawing dimension tolerance ` fractional 1/64 angular 0. 76 £482. Canada also uses imperial measurements in some. Unless otherwise specified, the shaft keyway is assumed to be standard. This is our collection of frequently used reference tables for shop work. 1265 0. Allen™ keys are identified as being either metric-sized keys in millimeter sizes or SAE (Imperial) sized keys in fractions of an inch or decimal equivalents. 7. Keyway broaching guides hevicut inch to suit H1 broach style. 048: 0. Browse Part Number 68514444136, L Type Hubs with Keyway - Inch (Imperial) Bores in the The Timken Company catalog including Part Number,Item Name,Disclaimer,Description,Description ,Bore Size ,Hub Style,Coupling. 2-6 Antimony St, Carole Park QLD 4300, Australia PhoneANSI woodruff size charts express measurements in inches and nominal key sizes with higher numbers corresponding to bigger keys. Design of Square Key and Keyway. As with all functions of the Machinist's Calculator, linear values can be. 9 mm, & 1. Browse Part Number 68514410210, L Type Hubs without Keyway - Inch (Imperial) Bores in the The Timken Company catalog including Part Number,Item Name,Disclaimer,Description,Description ,Bore Size ,Hub Style,Coupling Type,Coupling Size,Materi. 960 in 125. Couplings • Standard Metric Keys & Keyways for Metric Bores with One Key (Page 2 of 2) All Types Metric Key & Keyway Dimensions Per ISO/R773 – P9 Width Tolerance (See Pg. Top. Metric Keyways Dimensions ISO/R773. keyways available upon request. 05. Keyway Size (in) Part Number Description Bore Size Coupling Size Hub Style Keyway Size (W x D) Length thru Bore CAD; 68514417923:. Each tolerance has a maximum and minimum. The pointer changes to . Parallel keys are most commonly used. Designation - designated as: 1. 19-1997; Design of Square Key and Keyway (Wood Ruff) Stress, Shear and Torque; Metric Key Keyway Dimensions center of the keyway. 38 1958. The sizes below 5/16 inch are intended to fit a hole 1/64 inch larger than the pin size; for pins larger than that the pin and hole size are the same. The above equation means that the basic size is 40 mm. 1; Hardware. KM and KML lock nuts are used to locate bearings onto a shaft. B +0. Save as favourite. 200 in 55. 04 mm: Outside Diameter: 3. 4 mm: Outside Diameter N/A 2. 2) Any 8-3/4" center section may be interchanged for another as an entire assembly. key. Two-bearing housings – PD series . Coupling Size Keyway Size (W x D) Length thru Bore Outside Diameter; 68514450357: Description N/A RRS095 HUB 1/2 N/KW : Bore Size N/A 1/2 in: Hub Style N/A 1 : Coupling Size N/A RRS095 : Keyway Size (W x D) N/A No Keyway : Length thru Bore N/A 1 in 25. Imperial Tap Chart: Keyway Dimensions: Melting Points: Metric Tap Chart: O-Ring Sizes:. Max. Sort by: Bore diameter d. 86 3. 3mm 2. Metric keyways are dimensioned by width and depth as measured from the radius of the shaft to the center of the keyway. Sunk keys are sunk into the shaft for half its thickness, where the measurement is taken at the side of the key. 30. The key length should be less than about 1. xls Created Date: 1/23/2014 8:35:20 AM. Keyway Bore Diameter Size Bore Reference -0. Bore Size : 2 1/4 in: Coupling Size: 75 : Set Screw Style Coupling Size (Dimension T) 3/8-16 : Set Screw Style Coupling Location Size (Dimension SL) 0. 200 in 55. Imperial systems use inches and feet, and these are the standard units of measurements in the United States. Keyway Size (W x D) 5/16 x 5/32 in: Length thru Bore: 1. Our digital library hosts in multiple locations, allowing you to get the most less latency time to download any of our books like this one. 542. Box 12086 Omaha, NE 68112-2086Woodruff key is a easily adjustable key, with a hammer blow to the key. 3mm 2. Read more on how keys and keyways work and what types are available – Keys and Keyways. DIN 6885/1 :- Definition. 2500 0. BS 5686:1986, ISO 14-1982: Specification for straight-sided splines for cylindrical shafts: metric nominal dimensions, tolerances and gauging requirements. Metric Bore / Keyway per DIN specifications. 540 in 89. AIA/NAS NA0139 - Keyway and Key Slot Dimensions Metric (an Aerospace standard). Unless stated otherwise, hub torque and horsepower ratings assume a SOX (NBR) rubber spider is being used. Metric keyways are dimensioned by width and depth as measured from the radius of the shaft to the center of the keyway. - Predrilled for wall mounting. 04 mm: Outside Diameter: 3. 350 in 85. Shaft (Arbor) Keyway Dimensionl Data - ANSI/ASME B94. ICS Code (Keys and keyways, splines): 21. 05 mmThe problem with taper keys is that they can cause the center of the shaft rotation to be slightly off of the mating part. 38 in 35. This online broadcast Imperial Woodruff Key Keyway Dimensions Pdf can be one of the options to accompany you taking into consideration having extra time. 92 mmBore Size : 2 1/8 in: Coupling Size: 48 : Set Screw Style Coupling Size (Dimension T) 5/16-18 : Set Screw Style Coupling Location Size (Dimension SL) 0. 477 Maximum 2. Typical steels for locknuts are: AISI, C1015, C1018, C1020, C1025, C1035, C1117, C1118, C1212, C1213, and C1215. Width. 99 mm: Keyway Size (W x D) 5/16 x 5/32 in: Length thru Bore (Dimensions LTB1/LTB2) 1. 590 in 14. 5 1. Split pillow blocks – SAF and SAW series (inch dimensions) Split pillow blocks – SDAF series including the extended range (inch dimensions) Non-split pillow housings and take-up housings – SBD and THD series . We use . While a designer is free to specify any keyway they wish, straying from the standard option is likely to increase the cost, time, and complexity of the part. For instance, Metric size 9 mm doesn’t have an imperial counterpart. 3mm 3. 91 mm: Keyway Size (W x D) 3/16 x 3/32 in: Length thru Bore (Dimensions LTB1/LTB2) 1. 85 mm: Outside Diameter N/A 5. 5020 2. Wire Gauges: Wood Screw Dimensions: Imperial. 1 Square Keyway Tolerances Minimum 2. Min. 4mm 1mm 1. These are American. - Series F couplings supplied with 4) All dimensions per AGMA 9002-A86 interference fit bores without set screws commercial standards. Min. 90 2. RoyMech Resources Keyways Taper Metric Key and Keyway Dimensions These Pages include various standards. 1265 0. 30. 960 in 125. Drill Size & Decimal Equivalents. BS ISO 4156:2005_1: Straight cylindrical involute splines. Over Width, W Height, H Size, bxh 1 1/4. Keyway (Hub) Radius r. 25 mm: 68514455680: Description N/A RRSC190 HUB 38MM 10X3. The key and key seat cross. Shaft Diameter. BOTTOM OF SHAFT TO BOTTOM OF KEYWAY. recommendations except for the bore sizes marked* which are shallower. 350 Maximum 2. Nominal Size Square Key: Cutter Hole & Keyway. Also, T1 and T2 are not Keys and keyways. 414 Maximum 2. Also calculated are the overall measurements for shaft and bore, as well as the chord height. Keys and keyways BS 46 Part 1 : 1958 Keys and keyway Dimensions-Parallel Rectangular Adve Radius 0. - The maximum tolerance describes the. 1) The tolerance zone for hub keyway width b for parallel keys with normal fit is ISO JS9 and with close fit ISO P9. Imperial Supplies LLC does not provide services and products outside the United States For more product information by email, click here. Spacing between shafts should be greater than 1/8 inch and less than OAL minus the sum of the two bore dimensions. Standard . 1875 0. 620 in 15. Phone: +61 (8) 9451 6011Facsimile: +61 (8) 9458 5766. The dimensions of keys and keyways for marine tai l - shafts shall be as shown in Table 8 and Fig. Width. Insert these bushings into a drilled hole and twist the lock ring to secure. 300 in 160. 120. Related. 19-1997. The tolerance zone. In this calculation a shaft of length L, diameter D, with keyway dimensions K × H is considered. Lovejoy’s standard bore program covers AGMA, SAE, and DIN bore/keyway and spline bore combinations. For dimensions in millimeters, multiply inch values, except thread diameters, by 25. 010 Height (d) (t) - DIM Keyway Width (w) AGMA 9002-A86 Inch Bore and ANSI B17. Metric hex key wrenches made in germany from . Keyway (Hub) Keyway. British Standard :BS 46 Part 1 : 1958 Keys and keyways and. G&G Manufacturing Company 4432 McKinley Street P. The tolerance zone for shaft keyway width b with normal fit is ISO N9 and with close fit ISO P9. Keyway and Key Size Dimensions * Common dimension specification English Standard Keyway and. For more information about our Imperial machine keys, call us today at 724. Ideal for applications up to 25° of angular misalignment and speeds up to 6,000 RPM. Manufacturing will be based upon DIN 6885 - T1. WOODRUFF KEY DIMENSIONS - METRIC - BS4235:2 -1997. 96 mm: Outside Diameter: 3. By the end, you’ll no longer be stuck on determining Allen wrench size for the. 90 mm: Overall Coupling Length: 5. 38 in 35. British ISO Metric Screw Threads Designations. The unit to indicate the sizes of spur gears is commonly stated, as specified by ISO, to be “module”. The inch and metric dimensions here correspond to common values. HD Type are available in round, hex, splined, or keyway bore. The dimension drawings will show the flanges for each size. 4mm 1mm 1. Email. A tolerance is described using a letter followed by a number. Bore (DimCoupling keyway dimensions conform to DIN 6885, JIS B 1310-1976, UNI 6604-1969, USAS B 17. 240 0. 1. 67 mm:. Standard External Metric Thread and Fastener Sizes M 0. keyways available upon request. 4. Imperial systems use inches and feet, and these are the standard units of measurements in the United States. Hardware ANSI Menu. Browse Part Number 68514410771, L Type Hubs with Keyway - Inch (Imperial) Bores in the The Timken Company catalog including Part Number,Item Name,Disclaimer,Description,Description ,Bore Size ,Hub Style,Coupling Type,Coupling Size,Material,. The U. ΔTo (Incl) 3 1/2 Square and 7 Rectangular key widths. Keys. 5020 2. Keyway Calculator *tweaked* - just enter diameter of shaft (or bore)! DMF_TomB, I took your calculator you posted, added some more graphical info and tweaked a bit, so it automatically looks up the standard keyway for any given diameter shaft or bore and adds everything (again, automatically) to the graphic. Hex Head Fasteners. 82 in 20. 19-1997. keyways & keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keys 1, the Metric key size is W x T. The keyway dimensions are also different from the English system. Washer Sizes: Wire Gauges: Wood Screw Dimensions: Key Dimensions. DOWNLOADS. Parallel Keys and Key Grooves Note(1) The applicable shaft diameter is calculated from the torque corresponding to the strength of the key, for presentation as referential data for general-purpose use. 590 in 14. 04 in inch mmConveyXonic Poly-V Belt Sizes 2/27/20 Ribs in stock in rollers with 43mm endcap Ribs in stock in Part no. 8mm 2. Woodruff keys, identifiable by their half-moon shape, are measured two ways depending on if it is an imperial or metric key. 035″, 0. 142 in 29. If a setscrew is required, drill and tap over keyway as shown in Figure 3. 96 mm: Outside Diameter: 3. Keyway Size (W x D) 5/32 x 5/64 in: Length thru Bore: 1. S. Max. 846. Browse Part Number 69790414240, F Type Rigid Hubs, Inch (Imperial) Bore & Keyway - Exposed & Shrouded Bolt Designs in the The Timken Company catalog including Part Number,Item Name,Description,Description ,Bore Size ,Size,Hub Style,Type,HubWe manufacture several kinds of machine keys in many sizes: Woodruff keys are half-circle shapes, with radius or flat bottoms. All dimensions given in inches. Title: Tables. The first is Js9. 248 0. Our Standard woodruff keys are machined metal fasteners used to transfer torque from a shaft to gears and function as a fail-safe device and have ANSI Standard dimensions. Nominal sizes, dimensions; for tangential keys, tapered-shaft-end keys, marine tailshaft keys. 487 Minimum 2. Max. Keyway Dimensions. 05 mm: Outside Diameter: 2. 016 1/64 Imperial Sizes (inch. 45 mm: Outside Diameter N/A 3. Trunnion bearing housings for grinding mills – FSDR. Standard Finish: 12 to 23: Self-Finish. Imperial Keyway Broach Set 1/8 - 3/8 Bushes 1/2"- 1-1/2" + Shims From Rdgtools £ 199 50. ) Imperial Sizes (inch. 0635 0. 360 Minimum 2. 248 0. 1. 85 mm: Length thru Bore: 1. Rectangular or square parallel keys and their corresponding keyways (Dimensions in millimetres) 95. Standard External Metric Thread and Fastener Sizes M 0. Nearly every shaft diameter has a corresponding standard keyway width and depth – this calculator helps you find it. (Square) Max. SKU. Melting Points. 424 Minimum 2. Keys and keyways. 960 in 125. 40. Dimensions (Inches) Over. Woodruff key is essential for operating high speed. Depth at forward end. I T 8-Tolerance grade for the hole is 8. ANSI Woodruff Keys. Finished Striaght bores for standard AGMA Class 1 Clearance fit. Imperial Tap Chart: Keyway Dimensions: Melting Points: Metric Tap Chart: O-Ring Sizes: Pipe Threads: Screw Extractors:. 8mm 1. F Type Flex Hubs with Keyway - Inch (Imperial) Bores. Browse SC Type Spacer Coupling Hubs with Keyway, Standard Length - Inch (Imperial) Bores in the The Timken Company catalog including Part Number,Description ,Bore Size ,Hub #,Keyway Size (W x D),Outside Diameter,Dimension L,Dimension SLImperial Tap Chart: Keyway Dimensions: Melting Points: Metric Tap Chart: O-Ring Sizes: Pipe Threads: Screw Extractors: Sheet Metal Gauges & Weights:. It is ideal for applications with angles up to 25° and speeds of up to 1,750 RPM. United States. The way the length of a cotter pin is measured depends on the style of the. Wire Gauges: Wood Screw Dimensions: Imperial Tap Chart. Interference Fit Bore Tol. Shaft Diameter: key : Keyway (Shaft : Keyway (Hub) Keyway. ANSI Woodruff Keys. TAPER KEY DIMENSIONS - METRIC - BS 4235 -1: 1972Keyway Size Chart - Farrell Bearingsways. • Keys DIN 6885 → Page 842. Standard sheet DIN 6885 Print this page Keyway type in the bore and the shaft ISO Fundamental Tolerances. 25 - M 1. - Steel cabinet in sand color. 48 3. RECTANGULAR KEY DIMENSIONS - IMPERIAL - BS46:1 1958 SQUARE KEYWAY DIMENSIONS - IMPERIAL - BS46:1 1958 SQUARE KEY DIMENSIONS - IMPERIAL -. BOX 2400 FORT SMITH, ARKANSAS 72902-2400 U. title: b-7249. A is a stronger version of the MB washer. 0005. Nominal key size b × h Applied shaft diameter d Key size Keyway size; b h c or r Standard size of b1 and b2 b1Tolerance （h9） b2 tolerance （E9） r1 and r2 t1 t2; Standard size Tolerance（h8） Standard size Tolerance(h10) Standard size Tolerance Standard size Tolerance; 4×4: 10 or more and 13 or below: 4: 0 -0. To add a hole callout: Click Hole Callout (Annotation toolbar), or click Insert > Annotations > Hole Callout. Frac. SIZE ATK501P 4 x 4 ATK502P 5 x 5 ATK503P 6 x 6 ATK504P 8 x 8 ATK505P 10 x 10 ATK506P 12 x 12 ATK507P 16 x 16 ATK508P 22 x 22 ATK509P 25 x 25 ATK600P 25 x 22 ATK601P 7 x 8 ATK602P 8 x 10 ATK603P 8 x 12 ATK604P 9 x 14 ATK605P 10 x 16 ATK606P 11 x 18. For use with F (Flex-Flex) or FFR (Flex-Rigid) couplings. Standard External Metric Thread and Fastener Sizes M 0. As noted above, when selecting a keyway tolerance, there are two common selections in the. 1-800-ASK-4WEG Sales 1-800-839-2529 Warranty 1-800-ASK-4WEG After Hours Sales Select after hours option 1-877-WEG-DRIV Drives Tech Support NEMA Standard Dimensions IEC Critical DimensionsCarbon & High-Alloy Steel: Rockwell C38 - 46. Boot retaining grooves are standard. Product description. 005 x. 180 in 29. S. Browse QUICK FLEX Standard Hubs with Keyway - Inch (Imperial) Bores in the The Timken Company catalog including Part Number,Description ,Bore Size ,Coupling Size,Keyway Size (W x D),Length thru Bore,CADBrowse Part Number 68514411518, L Type Hubs with Keyway - Inch (Imperial) Bores in the The Timken Company catalog including Part Number,Item Name,Disclaimer,Description,Description ,Bore Size ,Hub Style,Coupling Type,Coupling Size,Material,. Imperial Tap Chart. 010 x. BS 46 Part 1 : 1958 Square Keys and keyway Dimensions. We would like to show you a description here but the site won’t allow us. 88 mm: Overall Coupling Length: 3. The F Type coupling consists of two flex hubs, two sleeves and one accessory kit. Bore (Dimensions. Nominal Dia. 2 continued. Keyway Size (W x D) No Keyway : Length thru Bore: 0. 3mm 2. ANSI Key No. Design of Square Key and Keyway (Wood Ruff) Stress, Shear and Torque. 150 in 80. BS 46 Part 1 : 1958 Square Keys and keyway Dimensions. Dimensions of parallel keys and taper keys. NOTE. From £39. They have metric threads and four equally spaced slots located around their circumference to accommodate a spanner. ). British Standard :BS 46 Part 1 : 1958 Keys and keyways and taper pins. The deviations are less than the basic size. Detailed width tolerance information is best drawn from the manufacturer. 380 in 35. Many keyways are milled directly into a shaft or broached into the corresponding bored holes. Coping with foreign bore and keyway standards | Machine Design. Frac. The keyway dimensions are also different from the English system. Max. S. 05 mm: Outside Diameter: 2. A rectangular key is generally used for shaft diameter between 1” (25 mm) and 20” (500 mm) Generally, these have a reduced effect on the shaft due to its shallow keyway depth. All dimensions are in inches. Max. This standard covers the size, type and tolerances of parallel and taper keys and keyseats, and their relationship to shaft diameters and bore diameters. SHAFT DIAMETER (D): (Inches) KEY EFFECTIVE LENGTH (L): (Inches) NOMINAL KEY SIZE: KEY WIDTH (B): KEY HEIGHT (H): KEYWAY DEPTH IN SHAFT (A): KEYWAY DEPTH IN HUB (C): SHEAR STRESS. 4. 120. Over To (Incl. 04 mmKeyway Sizing Chart - Free download as PDF File (. Recommended uniform relationship between shaft diameter and key sizes for parallel and taper keys. 770 in 44. 2 7-1,2 1. 25 and up: PhosphateBrowse Mite® Type Coupling Hubs w/ Keyway - Imperial in the The Timken Company catalog including Part Number,Description ,Bore Size ,Set Screw Style Coupling Size (Dimension T),Overall Length,Length thru Bore,Outside Diameter,Max. The L Type coupling consists of two standard L Type hubs and one spider. The U Type consists of a triple-wound flexible steel spring brazed to a steel hub at each end. D. 91 mm: Keyway Size (W x D) 1/4 x 1/8 in: Length thru Bore (Dimensions LTB1/LTB2) 1. NEMA states only a minimum value for AA dimension. Features such as bore size and keyway are not rendered or. Hardware, Imperial, Inch Hardware, Metric, ISO Heat Transfer Hydraulics Pneumatics HVAC Systems Calcs Economics Engineering Electronics Instrumentation Engineering Mathematics Engineering Standards Finishing and Plating Friction Formulas Apps Lubrication Data Apps Machine Design Apps Manufacturing Processes Materials and. 540 in 89. They are primarily used in compact applications like electronics and aren’t seen in every industry. 3mm 2. The wide selection of models feature compact size and reliability, which make them ideal for both adjustable and fixed center drives in all types of applications using. com web: Supersedes 4-96Imperial Tap Chart: Keyway Dimensions: Melting Points: Metric Tap Chart: O-Ring Sizes: Pipe Threads: Screw Extractors:. Available in sizes: 6, 8, 10 and 12 (Other sizes are quantity dependent) with your choice of round, hex, splined, or keyway bores. Each tooth’s cutting edge is a few thousandths of an inch larger than the one before. 0625 0. This all steel design ensures optimum equipment protection. Browse Part Number 68514462019, Curved Jaw Coupling Hub w/ Keyway in the The Timken Company catalog including Part Number,Item Name,Disclaimer,Description,Description ,Bore Size ,Hub Style,Type,Coupling Size,Hub Material,Set Screw Style CouSupply. Two hubs with internal teeth engage an elastomeric flexible center, or sleeve, with external teeth. 1.