Metric keyway. Nominal Dia. Metric keyway

 
 Nominal DiaMetric keyway Ruland is the only North American supplier of clamp style universal joints and manufactures the clamp feature, bores, and keyways in our advanced manufacturing facility in Marlborough, MA USA

We would like to show you a description here but the site won’t allow us. Keystock is available in both inch and metric sizes. I've selected a shear strength = S s = 200 MPa, and a compressive strength = S c = 130 MPa. KeyWay /Key Dimensions. 3D Printing & CAD. Regular Price: $14. maybe 20. The keyway is a longitudinal slot in both the shaft and mating part. The minimum width is limited to provide the proper strength to carry the imposed loads . 0mm to 26. 5, 2, 2. MB . Common Uses: Original equipment, including motors, gear boxes, gear reducers, and. Keyway Width "D" Nominal. Ratio 1:2 Series: A 1C 3M BUY - Bevel Gears Ratio 1:3. 6 8 10 12 17 22 30 38 44 50 58 65 75 85 95 110 130 150 170 200 230 260 290 330 380 440. We also cut keyways in blind hole conditions, including blind keyways with a groove relief at. Press it into place for use in high-torque applications or to replace a key in a worn. Bushings rest inside the arbor hole of your workpiece and act as guides to ensure rigid and accurate keyway cutting. 00mm; 5. Bushings for smaller arbor holes are collared for easier handling. Check Details. It comes in a sturdy and convenient to carry Plastic or Wooden case. 18-8 stainless steel key stock offers a balance of strength and corrosion resistance. 0500 605669 5 C 0. Total revolutions of shaft = 900x 10 6 revs. This catalog covers the features, benefits, dimensions, selection, and installation of various jaw type couplings, including the industry-standard L type. . 000 -0. Straight tooth keyseat cutters have teeth that are arranged in a straight line on the. Metric key keyway dimensions _ engineers edge _ Keyway rectangular parallel roymechKeyway misumi dimensions metric tips designs year threads standard majority got below New year, new designs tipsKeyshaft keyed shaft, diameter 1 7/16 in, keyway 3/8 in x 3/16 in. 5000 2. Made of Grade B7 steel, the tensile strength of these threaded rods is one and a half times higher than low-strength steel threaded rods. Standard keyways are machined to two specifications: • Bore Codes prefixed with a “P” denote a metric keywayMarlco keyway broaching guides litecut metric to suit L1M broach. Please note that the key sizes in parentheses are older sizes that are no longer commonly used. 04-06-2006, 02:58 PM #6. DUMONT 5/8" Keyway Broach E. 1 Square Keyway Tolerances Minimum 2. Marlco keyway broaches litecut inch L0 broach style. 5 in. Inch set. Woodruff Key Assortment, 80 Piece. Shaft Diameter. Stress Concentration Shaft. As noted above, when selecting a keyway tolerance, there are two common selections in the metric. keyways & keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keys Key Dimensions Standard keylengths (mm). See dimensions W and h in Figure 1. , depending on the lock nut size: ANSI/ABMA Std. Use individual keyway broaches in a variety of arbor hole sizes. Set the anvil over the keyway and measure down it keying a shaft, and using a standard mic if keying a bore. 00mm; 8. This technique is used for parts like a gear, hub or pulley. Keyways will be furnished with P9 width tolerance only upon request. Made of solid carbide, these keyseat cutters are harder, stronger, and more wear resistant than high-speed steel for the longest life and best finish on hard material. Default metric fastener thread pitch. Also known as jaw couplings, use them to connect motors to pumps, mixers, and other high-torque equipment. Dimensions and tolerances of metric keyways for parallel keys (source:BS 4235-1: 1972) 1, the Metric key size is W x T. 5mm) wide which is cut on our KEYSEATER. C +0. 5. Install these keys in a drilled and reamed hole to locate fixtures and vises on your machine table. Woodruff Keys. 4mm. Keyed double wide collars can be used as short rigid couplings in space constrained applications and benefit from increased torque capacity from the keyway. Whereas the P9 tolerance is a press fit tolerance. b. Cutting Tools / Broaches / Keyway Broach Sets Viewing Page 1 of 2 (16 results). Check Details. 2-6 Antimony St, Carole Park QLD 4300, Australia Phone +61 7 3271 5424. Depending on the slot width tolerance, the following fit or seating results in combination with the parallel key:This is an undersized clearance. A rounded bottom allows these keys to rock in their seat to relieve stress on the shaft caused by vibration or misalignment. Using the G9774 18-Piece HSS Keyway Broach Set is the quickest and easiest way to produce a keyway. These keys have a rounded shape that makes them easy to remove when parts need to be taken apart frequently. Our keyed drive wheels are engineered to withstand demanding industrial applications. (Dimensions comply with DIN 6885/1) † Requires the use of. 250" keyway in the sheave and use a 0. tolerances and fits for metric bores and keyways. Keyshaft keyed shaft, diameter 1 7/16 in, keyway 3/8 in x 3/16 inKeyway parallel keyways metric t2 wxh bores Keyway keyed keyways boresGates belts, hoses, and applications: standard & non-standard shaft key. The following tables report the preferred metric fits and tolerances for hole and shaft basis systems given by the ISO 286-1 (2010) and ANSI B4. Metric Keyways Dimensions ISO/R773. of Shims INCLUDED Tooth Pitch (Inch) No. Any required shims are included with Broach. 2 Broaches: A-2 mm, A-3 mm 3 Collared bushings: A-6 mm, A-8 mm, A-10 mm All necessary shims. Metric Medium-Strength SteelThreaded Rods—Grade B7. Use them to connect gears and other components with tapered keyways to shafts. KM and KML lock nuts are used to locate bearings onto a shaft. They have metric threads and four equally spaced slots located around their circumference to accommodate a spanner. Keyway Bore (inches) Reference Height (d) 1. Shaft /Hub/keyway material (BS EN 10083 C45 normalised. Metric Key & Keyway Dimensions Per. 3mm 2. 401/2A Set, but for sixteenth. 05 to 48 in. 0000 /-. Standard size of b1 and b2. Bushings rest inside the arbor hole of your workpiece and act as guides to ensure rigid and accurate keyway cutting. Inch 360 Metric 140. For square keys, key width and depth For round keys, key radius or key diameter. Also known as half moon keys. They should be locked by a lock washer to prevent unintentional loosening. 3. Keys and key stock are small metal bars or wedges that fit between an output shaft and the hub of a pulley, gear, sprocket, or other rotating component. 8mm 1. I can't find one for metric as all my book are for imperial. $999. Keyway cutter for slot machining of shaft to hub connections. of Teeth Minimum Length of Cut (Inch) Maximum. Referencing Figure 1, the Metric key size is W x T. For custom requests please use our Live Chat feature or contact us at sales. For example: a keyway. 50mm x 50mm ; 75mm x 75mm ; 100mm x 100mm ; 125mm x 125mm ; Plastic Color Coded Slotted Shim. Also calculated are the overall measurements for shaft and bore, as well as the chord height. Each hub includes a set screw (unless noted), which bites into your shaft to hold the coupling in place. 025-39. High Speed Steel, Cobalt, Cutting Tools,22pc keyway broach kit ferrule bushing gasket set, metric size, high speed steel material, metal processing tool. Unless otherwise specified, the shaft keyway is assumed to be standard. 101mm Long x 8mm Keyway Width x 3. Woodruff keys work well near shaft shoulders, where a standard open keyway would create too much stress. Page 1420 | Modi˜cation standads DIN 6885 Keyway, key details Extract Page 1 heavy type d b P9 / JS9 Hub keyway b P9 / N9 Shaft keyway h t 1 = d + t 2 t 2 t 3 = d – t 4 t 4 6 2 2 2 7 1 +0,1 4,8 1,2 +0,1 Our Pull-Type Keyway Broaches are ideal for applications in high volume production pull-type machines. 10" Width ;American Metric ® Corporation Ametric. Fail-safe (will still perform if elastomeric “spider” fails) No metal to metal contact. You can readily employ these keyway broaches on steel and also on various ferrous and non-ferrous materials, including plastics, cast iron, and others. Standard inch-sized tapered pins have a taper on diameter of 1:48[1] while metric ones have a. KenCut™ KS • F3AU • Radiused • 3 Flutes • Plain Shank • Metric KenCut™ KS Solid Carbide End Mill for Keyway Milling. If keyways in shaft (How many, Size and tolerance, Radius required in keyway, Location tolerance of keyway respective to bore and other keyways) Types of Interface Information Required for Bolted Joints 1. 1All internal calculations are done in metric millimeters to a precision of up to half a micron (0. Depth of keyway is measured at CENTRE. 2 The standard does not deal with misalignment or offset greater than can be accommodated withinStandard Metric Keys & Keyways for Metric Bores with One Key Couplings. NUMBER OF SHIMS REQUIRED: 3. 19-1997; Design of Square Key and Keyway (Wood Ruff. Brass key stock is corrosion resistant and nonmagnetic. Brand: Import. They come in fractional or metric varieties (inch or millimeter), offering varying cut lengths. 250" key, dont worry about the 0. Scribd is the world's largest social reading and publishing site. 2500 0. British Standard Metric Keyways for Square and Rectangular Parallel Keys 11 5/16 3/8 7/16 1/2 3/4 3/4 7/8 Nominal Diameter, d 6 1/2 7 1/2 9 Square Keys preferred for shaft diameters above this line: rectangular keys, below Key 3 3/4 4 1/2 5 1/2 Shaft Key Size Versus Shaft Diameter ANSI B17. American Standard; 0. Our 5/8-inch keyed shaft is made with industrial needs in mind, but there are variations. 5 +. FREE delivery Nov 14 - 29 . W x T T H r T2 Metric Standard Parallel Keyway and Key Sizes Shaft Diameter Keyway Key (mm) (mm) (mm)* Width Depth Width Depth. Use them in light duty applications to connect gears and other components to shafts. Email This Page Download PDF Printable Page. Choose from our selection of keyed bushings, including shaft collars, rigid shaft couplings, and more. Climax Metal Products. Metric preferred hole based system of fits . Rounded keys fill oval keyways completely, reducing stress on the key and shaft. $14. Metric. If you are looking for a comprehensive and reliable source of information on jaw type couplings, you should download the Jaw Type Catalog PDF from Lovejoy, a Timken company. 8 out of 5 stars 5. 19-1997. 22 Piece Keyway Broach Kit Metric Size Metalworking Tool Bushing Spacer Set Bushing Metric Size 4mm B1, 5mmB1, 6mm C, 8mmC Broach with Tool Box, 13 Piece Bushing and 5 Piece Spacer Metalworking Tool. The Rotary Broach Tool Holder can be used on any CNC, Swiss, milling, screw. Add to Cart. Slightly. NOMINAL SHAFT DIAMETER. 010 Height (d) (t) - DIM Keyway Width (w) AGMA 9002-A86 Inch Bore and ANSI B17. Keyway (Shaft. 2-1978 standards. MB 5Lock washer for metric lock nuts. MCLC - With Keyway, Metric; Keyed Rigid Couplings: One-Piece, Metric Clamp style one-piece rigid couplings with keyed bores for additional torque capacity and metric dimensions. Lead Time Reduction. Metric key keyway dimensionsStandard keyway dimensions Shaft keysRe-design the shaft shown below to be a uniform. The collar rests on top of the workpiece rather than being supported from below. or Best Offer. 2(w/d)1. A key cutter, also known as a keyseat cutter, keyway cutter, or woodruff cutter, is a versatile tool that can be used to cut several different types of keyways. $250. depth. 1-800-825-6544. Quantities of each thickness. Keyway Broaches. Staggered tooth keyseat cutters have teeth that are arranged in an alternating right- and left-hand helix around the cutters' head. 002 to 0. width tol. 19-1997; Shaft Arbor and Keyseat Dimensional Data American National Standard Keys and Keyways; Standard Metric Keys Keyways for Metric Bores with One Key Standard Metric Keys & Keyways for Metric Bores with One Key • Couplings All Types (Page 1 of 2) Metric Key & Keyway Dimensions Per ISO/R773 – Js9 Width Tolerance « Keyways will be furnished per ISO/R773 and Js9 width tolerance unless otherwise specified. Keyway metricFalk_metric_key_keyway. Minimum keyseat width is that figure. keyways & keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keysIn October’s column, I mentioned the typical tolerance for keyways. 004, -. Rexnord 427-140. Unless otherwise specified, the shaft keyway is assumed to be standard. For custom requests please use our Live Chat feature or contact us at sales@ruland. 3mm 3. Imperial systems use inches and feet, and these are the standard units of measurements in the United States. 70 Metric Hss Keyway Broach Set, 4 mm, 5 mm, 6 mm and 8 mm Keyway Size, Style B and C, 5100-0070. Accusize Industrial Tools No 60 Metric H. You can readily employ these keyway broaches on steel and also on various ferrous and non-ferrous materials, including plastics, cast iron, and others. KW-3 Manufacturer Part Number: 22203. Choose from our selection of steel metric key stock bars in a wide range. FREE delivery Nov 27 - 30 . 5/16"-C HSS Keyway Broach 5/16 Width . Proper set screw design is to use 2. MISUMI. Standard keyways provide added more. Key dimensions: Parallel keys are most commonly used. Shape and dimensions of parallel key and keyway Shape and dimensions of taper key, headed taper key and keyway Excerpt from JIS B 1301:1996 S1 = b's tolerance× 1 2 S2 = h's tolerance× 1 2 h2 = h, f = h, e ≒ b S1 = b's tolerance× 1 2 S2 = h's tolerance× 1 2 Key body Cross section of keyway Key bodyToolbox Metric Keyway Dimension Problem The keyway sizes on the ISO gear (& probably others) is incorrectly dimensioned. FOREWORD [The foreword, footnotes and annexes, if any, in this document are provided for informational purposes only and are not to be construed as a part of ANSI/AGMA 9002-C14, Cylindrical. They provide the torque to drive the rotating component and help prevent unwanted slipping or movement. Js9 width Tolerance T2 Key & Keyway Dimensions Millimeters Keyway Keyway Keyway width Depth Radius "D" Nominal Hub w Hub "T2 "R" width Height Nominal Min Max Min Max Min Max Over Thru 8 2 2 2 0125 . Shaft coupling shaft hole additional modification serviceTaper keyway keyways gib roymech diameter bs radius Keyshaft keyed shaft, diameter 1 7/16 in, keyway 3/8 in x 3/16 inKeyway metric. DUMONT #10 STANDARD KEYWAY BROACH SET. Created Date:Our Pull-Type Keyway Broaches are ideal for applications in high volume production pull-type machines. Sold by Accusize Tools and ships from Amazon Fulfillment. A. Canada also uses imperial measurements in some circumstances, though officially, the correct unit of measurement in Canada is the metric system, which. The AL Type coupling consists of two standard AL Type hubs, one spider and one set screw, except the AL150 which is provided with two set screws. S. Metric key keyway dimensionsKeyway metric dimensions key iso tolerance js9 r773 width per depth hub t2 height radius text mill question. 99. Also known as jaw couplings, use them to connect motors to pumps, mixers, and other high-torque equipment. Keyway broach 1/16 to 1-1/2 inch, 2. Size, grade and types of bolts required 4. American Standard; Metric Rotary/Punch Broaches. See dimensions W and h in. ISO Class 8. . , New Berlin, WI 53151-7953 March 2015 (PDF revision) Telephone: 262-796-4060 Fax: 262-796-4064 Supersedes 07-2006. Linguette - sedi per alberi. Metric Key Keyway Dimensions; Parallel Key and Taper Keys Dimensions; Shaft Keyway Shear and Yield Strength Formulae and Calculator; Shaft (Arbor) Keyway Dimension Size Data - ANSI/ASME. Note: Broaches have a. All standardsMetric trapezoidal thread, 7H: ISO 2903 Axial run-out locating face/thread: 0,06 to 0,16 mm max. Mechanical & Motion Systems. Save 3% at checkout. ). 0. It may be mildly magnetic. keyway (bs 4235 - part i) Description. 2-1967 (R1998) - Engineers Edge. They are semi-circular, and fit into a Keyway shaped as a circular-segment in the shaft and a rectangular slot in the mating part. 700 HUB 40mm BORE X 12mm KEYWAY METRIC DSS @ 4. Lock pulleys and gears securely with these woodruff keys Read More. 487 Minimum 2. For custom requests please use our Live Chat feature or contact us at sales. system. Keyway size. 00mm; 6. Nominal Shaft Diam. Unless otherwise specified, the shaft keyway is assumed to be standard. 026" slop. This item: Accusize Industrial Tools No. Keyway and Key Size Dimensions W Standard Key and Keyway Sizing h T1 T r H T2 English Dimensions: Metric Dimensions: Keyway: W x T1 Key: W x T Keyway: W x h Key: W x T Metric Standard Parallel Keyway and Key Sizes Shaft Diameter (mm) Keyway and Key Size Dimension Reference English Standard Keyway and Key Sizes Shaft Diameter. Square keys. Cross-section of a parallel keyed joint. NSI Shaft and Hub Keyseat Dimensions for Woodruff Keys per. TOOLMASTER. Double-check the key-way's width and depth as it pertains to your assembly, however. Spline inserts are custom made in various alloys, geometries, sizes and tolerances and are attached to the insert holder with a set screw. ANSI woodruff size charts express measurements in inches and nominal key sizes with higher numbers corresponding to bigger keys. 8 mm: Shaft Diameter: 0. $89. height, and 16 to 25 mm shank dia. Get it as soon as Tuesday, Sep 12. The following link will lead to the comparison of these pitches : Table of Comparative Gear Pitch. Add to Cart. ISO Hardware Specifications Table. The first is Js9. 2 Axial run-out locating face/thread: 0,05 to 0,30 mm (0. The tool is perfect for creating precise keyways in the boreholes of pulleys, gears, washers, and other shaft-mounted components. Replacement Shim Sizes: 1/8 - 3/16 (5) | 1/4 - 9/16 (8) | 5/8 - 1 (4) | 1 1/8 - 1 1/4 (2) EDP No. The Woodruff Key numbers indicate normal key dimensions. e Dimension “d”Metric Ground Spiral Bevel Gears Module: 0. Compact, rugged, portable milling machine for on-site keyway and other milling jobs. 5" (63. Save 66%. DIN 7154, H7 Metric Bore and DIN 6885, Js9 Square Keyway Tolerances Page 1 of 4. Product Compare 0. Home; Metric Keyways Index page; Parallel Keys and keyway Dimensions; Parallel Keys and keyway Dimensions to BS 4235-1:1972 KeyWay & Key Dimensions. Stafford Metric Rigid Shaft Couplings are fully metric in all specifications, including the clamping screws. Self-centering and self-aligning V-base. com. pdf - Free download as PDF File (. ** For rear clearance Information DIN 6885 page 1 and age 2 differ mainly in the radial position of the parallel key (see sketch). Rotary Drive Products Gears, Bearings, Couplings and Shaft Accessories. Also known as sine keys. Specialty tools designed for cutting keyways in machined holes. Use the keyways with machine keys to transmit torque to gears, sprockets, and other keyed components. com, which includes; Gold Dichromate Plated Finish , Steel Material , 10 mm Width , 12 in Length , 8 mm Thickness. S. 50 £122. Keyways (Metric) Contributed by. Unequal flute spacing for chatter-free machining at highest feed rates. Check Details. AUTOMATION & IIOT. S. 30mm Inside x 57mm Outside Diam, Metric Set Screw Rigid Coupling with Keyway. Rebrisbol Keyway Broach Sets 6Pcs HSS Metric Industrial Tools for Lathe, Keyway Size A - 2mm, A - 3mm and Collared Bushings 6A, 8A, 10A 4. metric keyways, metric bores with inch keyways, metric bores with metric keyways, or shaft keyseat tolerances. BS 46 Part 1 : 1958 Keys and keyway Dimensions-Parallel Rectangular all dimensions in inches. 45. At the. A keyway is a slot that is cut on a gear, pulley, or shaft which covers the other half of the key projecting out of the shaft in which it is seated. Not to long after that, I bought a Dumont inch set. $ 29. Keyway Chart. huyett. 4. Key (engineering) In mechanical engineering, a key is a machine element used to connect a rotating machine element to a shaft. Tool Wrap. The Hassay Savage 11412 12 mm Style IV Metric Keyway Push Broach requires a pushing action to cut a keyway-shaped hole in a component and is made of M-2 high-speed steel for a balance of strength and toughness. See ANSI/AGMA 9112--A04 for metric bores with metric keyways. Made of chemical-resistant 18-8 stainless steel, these metric screws have an extra-soft nylon tip that reduces the noise, vibration, and damage that can occur from metal-on-metal contact. They are available in sizes from 1/4" to 1 1/4” in steel for high strength and stainless steel for corrosion resistance. One of the following methods should be used to specify keyways: Metric: W x H Key W x T2. Accommodates for angular and parallel shaft misalignment. Made of chemical-resistant 18-8 stainless steel, these metric screws have an extra-soft nylon tip that reduces the noise, vibration, and damage that can occur from metal-on-metal contact. Metric Keyway Broaches (High Speed Steel) About RDG Tools. , " x 1. For example, an ANSI 202 measures 1/16 x 1/4, while ANSI 1012 measures 5/16 x 1 1/2. Keyway dimensionsMetric key keyway dimensions per iso/rtt3 js9 width Inch keyway chart ansi agma shaft key width b4 dimensions diameter nominal reference motor electricKeys keyway metric standard keyways sizes engineering shaft key parallel square fit fits mechanical data rectangular british limits figure. 315 Shank 0. Brand: KBC More Info. The key length should be less than about 1. 5000 2. Metric module, side fit. l. Allowance must be made for keyway and setscrews . We offer the most common American Standard and Metric Pull-Type Keyway Broaches, available either as Industry Standard 500 Series with threaded pull end or 600 Series with notched pull end. Designed for cutting keyways and keyseats, these woodruff-style cutters are designed with dished sides for clearance. The keyseat in a shaft for a parallel key. . --keyway dimensionsKeyway chart diagram hallite. 9 008 016 12. Available in 0. 25 - M 1. 315 Shank 0. keyways /keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keys. 0000 /-. keyways /keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keys. You may also refer detailed information on British Standard Metric Keys and Keyways. The bore diameters listed in the "Keyway Additional Modification Applicable Bore List" in the table below are available for the service. Use with an arbor (sold separately). Carbide Staggered-Tooth Keyseat End Mills. Cartener Pulley Keyway Key - Square Key Stock 60pc - Keyway Stock, Keyway Tension, Keyway Blank - Keyway Plastic Box - Flywheel Keys - Pump Shaft Key - 1/4 Key Stock - 3/16 key stock. AUTOMATION & IIOT. Inch (ANSI/AGMA 9002. Keyway additional modification is available for both single. 5020 2. This key stock is undersized, so keys will fit slightly more loosely than standard keys and are best for inconsistent keyways. From the right side of the shaft total diameter is given with tolerances. Metric Keyway Calculator. Keyway Bushings. Metric keyways are dimensioned by width and depth as measured from the radius of the shaft to the center of the keyway. 42. The set contains multiple Keyway Broaches & Collared Bushings in a range of fractional, metric, or inch sizes. They have metric threads and four equally spaced slots located around their circumference to accommodate a spanner. Step bore combinations including inch to metric are also available. Available in 303 stainless steel or black oxide steel with bore sizes from 8mm to 50mm. See dimensions W and h in Figure 1. Key & Keyway Dimensions - Millimeters Shaft Diameter Key Size Keyway Width Keyway Depth Keyway Radius "D" Nominal Hub "W" Hub "T2" "R" Over Thru Width "W" Height "H" Nominal Min Max Min Max Min Max 6 8 2 2. 80 Metric Keyway Broach Set In Box With Shims And Bushings,Keyway Broach Set,Metric Keyway Broach,Broach Set With Shim from Broach Supplier or Manufacturer-Chongqing Yuqing Machine Tools Co. 3125 0. Use them in light duty applications to connect gears and other components to shafts. Keyway Width. 8mm 2. Replacement or Extra Shims are provided in Shim sets corresponding to the Broach size and letter designation in the quantity necessary to cut to standard depth. Moorland Rd. If you are having a problem placing your online order, have questions about your merchandise, or need assistance with something not listed please call us at 1-716-791-6197. Keyway Bore Diameter Size Bore Reference -0. t1. --keyway dimensionsKeyway chart diagram hallite. Our largest keyway is 2. Non standard bores and over the keyways. Labels: Machine Elements. Key Size. The keyway dimensions are also different from the Englishsystem. 5 1. Woodruff Keys. 5 times the shaft diameter to ensure a good load distribution over the entire key length when the shaft becomes twisted when loaded in torsion.