depth. Eliminates need for complete shaft replacement. Yuqing keyway broach sets are ideal für engineering works, mechanical workshops, repair and maintenance departments of industrial business, apprentice shops and many more. 2) Dimension h of the taper key names the largest height of the key, and dimension t z. KeyWay /Key Dimensions. 2180 Corporate Lane, Suite 104 ~ Naperville, IL 60563 USA Phone (630) 596-9000 Fax (630) 596-9002 E-mail: [email protected] £55. keyways & keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keys1, the Metric key size is W x T. Close suggestions Search Search. To confirm the status of any standard, identify the replacement standard if it is obsolete and/or purchase the standard please use. ANSI woodruff size charts express measurements in inches and nominal key sizes with higher numbers corresponding to bigger keys. Taper metric dimensions keyway key bs 1972 keyways keys. None Provided. gear and pulley keyways, keyways, rifling, and all hole configurations. 3 Preferred length and weight of keys Preferred length and weight of keys is given in Table 4. Daemar’s Keystock are removable bars that are used to transmit torque from components including couplings, sheaves, sprockets and gears to a shaft. 2(w/d)1. Keyway Depth (Normally 1/2 of width) Total Height (X) = Depth (Y) = Metric Calculator Bore Size. 1875″ Diam, 3/8″ LOC, 2 Flute High Speed Steel Keyway End Mill Spiral Flute, Uncoated, 3/8″ Shank Diam, 2-5/16″ OAL, 30° Helix, Centercutting List Pricetolerances and fits for metric bores and keyways. 1, the Metric key size is W x T. Specification. Cut this stock to length to create the machine key you need. The keyway dimensions are also different from the English system. The second is a P9. You can readily employ these keyway broaches on steel and also on various ferrous and non-ferrous materials, including plastics, cast iron, and others. Shaft bushing boreMetric hex key wrench sizes wrenches 36mm 7mm bloomertool Metric keyway tolerance chartG. Woodruff Keys. Choose from our selection of keyway stock, including machine key stock, rounded machine keys, and more. You can return the item. No welding required. boeray 164pcs Woodruff Key Assortment Metric Set 17 Sizes Carbon Steel Woodruff-key Kit Woodruff Key-Crankshaft. Dimensions and tolerances of metric keyways for parallel keys (source:BS 4235-1: 1972) 1, the Metric key size is W x T. In the Metric system it is common practice to specify the key size. 00. RoyMech Resources Keyways Woodruff Metric key and Keyway Dimensions These Pages include various standards. 240. Standard Keyways: (Used on all of our shafting) “Plain” Shafting available on all Steel grades. BS ISO 4156:2005_1: Straight cylindrical involute splines. At the time of publication, the edition indicated was valid. These fits and Metric keyways are dimensioned by width and depth as measured from the radius of the shaft to the center of the keyway. Another benefit of this shaft key design is quick, hassle-free field replacement. (Dimensions comply with DIN 6885/1) † Requires use of chamfered keys. BOTTOM OF SHAFT TO BOTTOM OF KEYWAY. What are the. 4. Shaft /Hub/keyway material (BS EN 10083 C45 normalised. 542. AUTOMATION & IIOT. height, and 16 to 25 mm shank dia. Key KeyWay Nominal Dia Width b Depth d Tolerance Class Shaft t1 Hub t2 bxh Radius r width x thck Nom Free. 50 and 2 x 0. inch bores with metric keyways; metric bores with inch keyways; metric bores with metric keyways; or shaft keyseat tolerances. S. 0005. Keyway Dimensions. They conform to ANSI B17. Standard Metric Keys & Keyways. Width. Handwheels are supplied without a keyway. pdf Key sizeKeyway metric key iso dimensions standard keyways r773 keys pdf bores shaft hub depth diameter standards engineering table edge width. Metric Broach Shims Broach Size Shim Thickness (Inch) Code 3 A 0. WIDTH. The tolerance zone for shaft keyway width b with normal fit is ISO N9 and with close fit ISO P9. Machine keys are used in power transmission to transmit torque between a shaft and a shaft mounted component such as a gear, pulley, or coupling. Woodruff keys work well near shaft shoulders and on tapered shafts. LIFTING EQUIPMENT FOR PERFORMANCE, BROADCAST AND SIMILAR APPLICATIONS - PART 1: SPECIFICATION FOR THE DESIGN AND MANUFACTURE OF ABOVE STAGE EQUIPMENT (EXCLUDING TRUSSES AND TOWERS) BS 46-1:1958. Tool Wrap. 1 Retaining screws, jacking screws and spring dowel sleeves for keys are given in Table 2. They are also often used on tapered shafts. MANUFACTURERS PART NUMBER: B555144. See ANSI/AGMA 9112--A04 for metric bores with metric keyways. Total revolutions of shaft = 900x 10 6 revs. The Keyway dimensions are also different from the English system. This key stock is undersized, so keys will fit slightly more loosely than standard keys and are best for inconsistent keyways. Use the middle of the shaft with bearings and other round-bore components. This shafting is true and straight and needs no turning, but if keyways are cut in the shaft, it must usually be straightened afterwards, as the cutting of the keyways relieves the. Eliminates need for complete shaft replacement. 42Rounded keys fill oval keyways completely, reducing stress on the key and shaft. Metric Parallel Keys available with radius and/or square ends. Added on. The Metric system does not refer to keyseat or keyway dimensions as does. metric keyways to use iso standards. All Types (Page 1 of 2) Metric Key & Keyway Dimensions Per ISO/R773 Js9 Width Tolerance H Key & Keyway Dimensions Millimeters Shaft Diameter D Over. keyways available upon request. ANSI/AGMA 9112-B14 describes sizes and tolerances for straight and tapered bores and associated keys and keyways, as furnished in metric flexible couplings. Fillet radii comply with AGMA 9002-A86. Keyways (Metric) Contributed by. Cut it to length to create the machine key you need. Unless otherwise specified, the shaft keyway is assumed to be standard. Hole-Mount Fixture Keys. Key Size. Metric Keys and Key Steels in Steel C45 for fast delivery from stock. l. Key (engineering) In mechanical engineering, a key is a machine element used to connect a rotating machine element to a shaft. Keyway (Shaft. Keyway. Imperial (inch) keyways are typically dimensioned from a chord line that intersects the keyway sides and the shaft surface. D. Category. in Machine Elements & Structural Engineering. 2 out of 5 stars 119. ISO 2492:1974 Thin taper keys with or without gib head and their corresponding keyways (Dimensions in millimetres) $26. They are designed to connect two dissimilar sized shafts in virtually any combination up to a 50 more. keyway actual location across flats. metric keyways, metric bores with inch keyways, metric bores with metric keyways, or shaft keyseat tolerances. 3mm 2. The cutting edges increase until they reach the required size. Keystock. Keyways are British Standard Metric BS 4235: Part 1: 1972 DIN 6885 and conform to ISO recommendations with the exception of those marked* which are shallower. r1 and r2. In stock and ready to ship. 00. WDS 6063. Material options include alloy steel, aluminum, brass, copper, plastic, steel, and stainless steel. 8mm 2. - Series EL couplings supplied withKeyway Sizing Chart - Free download as PDF File (. 4. scope: This standard presents metric dimensions, tolerances, sizes and fits for straight bores, tapered bores, keys and keyways for unmounted industrial flexible couplings. Side View. . 97 £166. A key is a machine element used to connect a rotating machine element to a shaft. Metric keyways are dimensioned by width and depth as measured from the radius of the shaft to the center of the keyway. 003, -. 11131 Std plain bushings only 11331 TiN plain bushings only No. 00RoyMech Resources Keyways Taper Metric Key and Keyway Dimensions These Pages include various standards. For example: a keyway. This PA Note will explain the uses of keys and keyways in pulleys and bushings, and present current industry standards for key and Keyway. Metric Stainless Steel Nylon-Tip Set Screws. Choose from our selection of metric keys in a wide range of styles and sizes. with standard bores (one-half of the O. 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 Key & Keyway Dimensions – Millimeters Falk Coupling Hub Keyway Dimensions – Inches Shaft Diameter “D” Key Size Nominal Keyway Width Hub “W” Keyway Depth Hub “T2. 6552. Metric is measured width x height x length. Joined Dec 20, 2000. (Dimensions comply with DIN 6885/1) Requires use of chamfered keys. The following is listing of those standards: Standard Description BS4235 P Woodruff keys and keyways – same as ISO 391 BS46P1 Specifications, Keys and Keyways – obsolete Recommendations for key size, length and keyway depth as a function of shaft diameter are provided in ASME Standards B17. When a keyway is damaged, cut a new, wider one. Check Details. As noted above, when selecting a keyway tolerance, there are two common selections in the metric system. S. (Page 2. Woodruff Keys fit into a rounded slot cut into a shaft and a pulley or sprocket that has a slot cut into it is installed onto the shaft the slot slides over the woodruff key, creating an assembly that rotates as one unit. If two setscrews are ordered, the second setscrew is 90º clockwise from the first. Note: its difficult to tell from the drawing but the depth of metric keyways is typically dimensioned from the tangent of the shaft surface. Grainger approved keyed shaft,dia 1-1/4 in,keyway 1/4 inShaft keyway shear and yield strength formulae and calculator Splines keyways keys key keyway shaft milling. Specification. Serves aerospace, automotive, medical, government, and education. They are called “keys” because they lock a component to the shaft by means of a corresponding keyway in a shaft. Metric table * The slot width is typically P9, exceptions are indicated on the respective standard sheet. 2180 Corporate Lane, Suite 104 ~ Naperville, IL 60563 USA Phone (630) 596-9000 Fax (630) 596-9002 Keyway AGMA 9002-A86 Inch Bore and ANSI B17. Steel key stock is an economical choice with good strength. Keyway dimensions hub metric keyways t2 british bores js9 r773 wxhMetric key keyway dimensions Calculator for designing shaft keysAgma keyway bores engineers edge asa data fit llc copyright 2000 2021. Surface Finish — Sides and bottom of keyways. Keyway. Woodruff Keyways & Keys. Shaft Keys fit into slots cut into a shaft and a component such as a pulley or sprocket creating an assembly that rotates as one unit. Coping with foreign bore and keyway standards | Machine Design. 8 out of 5 stars 5. Note that aluminum is also available for lighter-duty applications. Keyway Dimensions. For a key to function, the shaft and rotating machine element must have a keyway and a keyseat, which is a slot and pocket in. 19-1997 ; Keyway Stresses for Non-metallic Gears and. Print Menu. 32R36 In this example only the second bore will have a keyway. Shaft Diameter. Woodruff Key Assortments. 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. Undersized Key Stock Assortments. REFERENCE DEPTH. 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. Mill specific holes or keyways in the hub to meet your specifications or weld in place. d w +0. Standard Metric Keys Keyways for Metric Bores with One Key; Keyway Cutter Hole Keyway Dimensional Data for MIlling Centers and Arbors - ANSI/ASME B94. Torque Applied to Key T = F ·(D/2) or F = T / (D/2) Shear Stress τ = T · K s / [ W · L · (D / 2) · N ]Keyway metric dimensions keys. Standard Metric Bores And Keyways DATA SHEET DS103 REV. Standard Metric Keys & Keyways. Mechanical & Motion Systems. Machining of square shafts with rounded ends (with or without keyways) Other machining available upon request per prints provided (drill, tap, threading) For Keyway MM Dimensions – see the table at. Woodruff key is a easily adjustable key, with a hammer blow to the key. 00 #46. Dumont #70 17 Piece 26 Combo HSS Metric Keyway Broach Set - 44498 - 30-600-070. metric keyways, metric bores with inch keyways, metric bores with metric keyways, or shaft keyseat tolerances. 5) unless otherwise specified, keyways are for parallel square keys. clearance fit bores with set screws. BRITISH Standard CONFIRMED JULY 1986 BS 4235-1: 1972 Specification for Metric keys and keyways -- Part 1: Parallel and taper keys. 6 - M 18. Pds Fire Door Slow. $486. Metric. Choose from our selection of metric keys in a wide. 8mm 1. Woodruff Keys. 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. width tol. BS 5686:1986, ISO 14-1982: Specification for straight-sided splines for cylindrical shafts: metric nominal dimensions, tolerances and gauging requirements. b1Tolerance （h9）. Woodruff keys work well near shaft shoulders, where a standard open keyway would create too much stress. See dimensions W and h in Figure 1. ISO Standard — mm Shaft Diameter Groove. Key KeyWay. 03 Bore Dia. 4235 : Part 1 : 1972)Shaft keyed keyway aluminum diameter grainger length motor shafts close. Figure 2 Keyway Sizes. You may also refer detailed information on British Standard Metric Keys and Keyways. Keyway size charts can come in both imperial and metric measurements. Brand: Rebrisbol. Key steel metric rectangular keys machine chart iso standard flat. DAV SYSTEMS SRL. huyett keystock reference guide by g. British ISO Metric Screw Threads Designations. this operation doesnt come up very often, so a dedicated machine is not practical here. Keys standard metric keyways mechanicalMetric keyway shaft depth reference dimensions diameter iso r773 width Metric woodruff keys are supplied to din 6888 / iso 3912 in c45k keyKeyway metric dimensions keys. KenCut™ KS keyway milling cutters are the ideal solution to machine key slots for a shaft-to-hub connection. 4235 : PART 1 : 1972 Imperial – Rectangular B. Keyed double wide collars can be used as short rigid couplings in space constrained applications and benefit from increased torque capacity from the keyway. They mill precise notches in rotary shafts to fit machine keys and can also be used for slot milling. Address. 3) Keyway fillet radius to be specified by customer. Are you looking for Mechanical Engineering Books? <click here>. Also known as sine keys. Daemar’s Keystock are removable bars that are used to transmit torque from components including couplings, sheaves, sprockets and gears to a shaft. We are also fully equipped to custom manufacture any Special Keyway Broach orders not listed in our catalog. British Standard :BS 46 Part 1 : 1958 Keys and keyways and taper pins. pdf Gates belts, hoses, and applications: standard & non-standard shaft. Share Share this awesome question with your friends. 6. Home; Metric Keyways Index page; Parallel Keys and keyway Dimensions; Parallel Keys and keyway Dimensions to BS 4235-1:1972 KeyWay & Key Dimensions. The robust. Standard metric keys keyways for metric bores with one keyKeyway metric key iso dimensions standard keyways keys r773 pdf bores shaft hub depth diameter standards engineering table edge width Keyway-and-key-size-dimensions. If the job comes with. Cut and bore keyways in gears, pulleys, and shafts. 8mm 3. These keys have a rounded shape that makes them easy to remove when parts need to be taken apart frequently, such as for maintenance or prototyping. t1. 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 keyways clubrunner bores wxhAccounting for the keyways in the shaft where the Keyway shaftKeyway bore coupling keyways bores metric chains wxh. Specification for flexible couplings for power transmission. S. The keyseat in a shaft for a parallel key. Fully metric, including clamp screws; Mate two shafts with zero backlash; Keyways provide added torque capacity and fixed shaft phasing; Keeps one shaft in place while the other is moved or changed; Smooth bore protects shafts from damage; Designed for aligned shafts, the 3-Piece Clamp-Type Coupling makes two shafts function as one. Keyway. The collar rests on top of the workpiece rather than being supported from below. Shars No. Gold dichromate plating makes product identification easy. Metric. Metric keyways are dimensioned by width and depth as measured from the radius of the shaft to the center of the keyway. Add to Cart. BS 46 Rectangular Taper & Gib Head KeyWay & Key Dimensions Ref Standard . Retention elements such as Splines, flexible couplings, tapered joints etc are also used. 1-1967, R1979). It was published under the authority of the Executive Board on 22 February, 1972. To confirm the status of any standard, identify the replacement standard if it is obsolete and/or purchase the standard please use. PRECISION 12940 at. All of the keyways i need to cut are . Type. of Teeth Minimum Length of Cut (Inch) Maximum. Keyed Shaftings can be furnished with a key already inserted assuring a proper fit. 2 Keyways Dimensions for keyways are given in Table 3. We stock duMONT keyway broaches in a range of sizes (American Standard or Metric) and coatings (Std, TiN, TiAlN) ideal for short run production and general maintenance. PRECISION BRAND Metric keystock is used to accommodate metric keyways; True metric keystock that conforms to metric keyway specifications; Material is high quality cold drawn steel C1020 to C1045; Gold zinc dichromate plating on most sizes makes product identification easy; All sizes meet ISO R773 and BS 4235,. Also, T1 and T2 are. They are used on compatible Davis keyseating machines. Shaft Stress and Deflection. Also, T 1 and T 2. pdfMetric key keyway dimensions per iso/rtt3 js9 width. Referencing Figure 1, the Metric key size is W x T. Inch Metric Tap Drill Sizes and Decimal Equivalents Magnetic Chart for Garage CNC Shop. Corresponding Keyways-- ISO R775 (withdrawn 1998), Cylindrical and 1/10 Conical Shaft Ends-- ANSI/AGMA 9002--B04, Bores and Keyways for Flexible Couplings (Inch Series) The intent of this document is to offer designers and users of flexible couplings preferred dimensions, tolerances and fits for metric bores and keyways. Keys and keyways . This standard incorporates a small portion of the numerous variations of shaft/bore fits. When broaching in multiple passes, shims are necessary to ensure full keyway depth. English Dimensions: Keyway: W x T Key: W x T Metric Dimensions: Keyway: W x h Key: W x T Common dimension specificationKeyway. Keys covered by this Standard have a relatively tight width tolerance. Name. 0 x 1. 002 to 0. Non standard bores and over the keyways. INTRODUCTION — The general practice in industry is to supply coupling hubs without fillet radii in the keyway corners to permit the use of standard commercial keys instead of keys with chamfered. 6001 set contains: 3 x LOM series broaches sizes 2, 3 and 4mm, 5 x guides for diameter 6, 7, 8, 10 and 12mm, 4 x shims 1 x 0. 3mm 3. Find the depths to cut in keyway and keyseat. 2 Normative references The following standards contain provisions which, throughreferenceinthistext,constituteprovisionsof this American National Standard. , New Berlin, WI 53151-7953 March 2015 (PDF. Imperial woodruff keys are measured by their width and diameter, whereas metric woodruff keys are measured by their width and height. 0005mm). The most common keyway combinations for large keyways and bores. 00. 012 in. BS 46 :1958 Parallel Keys and Keyway Dimensions; BS 46 :1958 Square Keys and Keyway Dimensions; Factors realting to. $471. 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. Downloads. Both are in the bottom of one of my roll-aways. Keyway Depth. Keyways (Metric) Results 1-6 of 6 < Previous Page 1 Next Page > Results per page: Name. These fits andThis item: Accusize Industrial Tools No. Metric keyways are dimensioned by width and depth as measured from the. Designation - designated as: A parallel key of Type A, width 12 mm, height 8 mm and length 50 mm shall be Parallel Key A 12 x 8 x 50 1. Also, T 1 and T 2. Unless otherwise specified, the shaft keyway is assumed to be standard. Rectangular. We started exhibiting at model engineering exhibitions in 1994 and realised from the shows that people wanted quite specialised tooling for their machines and also a wide range of tooling which they could adapt to suit their needs. Woodruff keys, identifiable by their half-moon shape, are measured two ways depending on if it is an imperial or metric key. , New Berlin, WI 53151-7953 March 2015 (PDF revision) Telephone: 262-796-4060 Fax: 262-796-4064 Supersedes 07-2006. Hub keyway depth is one-half the nominal height of the key and measured from the side corner. Woodruff keys are semicircular, fitting partly into A*B circular segment keyway with the remainder fitting into a longitudinal slot keyway in the mating part. The height of metric keys decreases by 1 mm for every 100 mm of length. 19-1997; Design of Square Key and Keyway (Wood Ruff) Stress, Shear and Torque; Parallel Key. 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. NOMINAL SHAFT DIAMETER. Source: machined many keyways into parts for engineers who dont know the difference between A and B, the machinist handbook uses B so whomever made the mating part also measured using B. , New Berlin, WI 53151-7953 USA Telephone: 262-796-4060 August 2003 Fax: 262-796-4064 e-mail: info@rexnord. 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. 00mm; 4. Source: heavydutydepot. js9 widthTaper keys. The cutting edges increase until they reach the required size. Yes (24) Customer Ratings (5) (5) (1) Compare. Lock pulleys and gears securely with these woodruff keys Read More. In stock and ready to ship. keyways available upon request. Currently unavailable. The height of inch keys decreases by 1/8" for every 12" of length. Keyway toleranceKeyway-and-key-size-dimensions. Woodruff Keys. 000 +. Spline inserts are custom made in various alloys, geometries, sizes and tolerances and are attached to the insert holder with a set screw. A square key is used if the deeper key depth is required to transmit torque. Size is clearly marked on each piece. Step-Up Shaft Adapters with Keyways. Keyways. 1, the Metric key size is W x T. I've selected a shear strength = S s = 200 MPa, and a compressive strength = S c = 130 MPa. 4. 2 Normative references The following standards contain provisions which, throughreferenceinthistext,constituteprovisionsof this American National Standard. The sets also contain keyway shims for controlling the depth of the keyway and keyway bushings for guiding and supporting the. Shop All STOREHOUSE. gathering dust, and have been for a few years. Created Date:tolerances and fits for metric bores and keyways. All Types (Page 1 of 2) ++ Keyways will be furnished per ISO/R773 and Js9 width tolerance unless otherwise specified. The Tool Holders designed to work exclusively with duMONT Stock Keyway and Slotting Inserts are heat treated tool steel, hardened to 58/60 HRC at the Insert seat providing resistance to deformation and longer tool life. 8mm 2. 00mm; 6. pdf Gates belts, hoses, and applications: standard & non-standard shaft keyMetric keyway. Standard keyways are machined to two specifications: • Bore Codes prefixed with a “P” denote a metric keywayStay organized with Keyway Broach Sets. Choose from our selection of steel metric key stock bars in a wide range. 8 0. The keys and keyways followed the recommendations of ISO R773:1969 and shaft tolerances followed ISO R775:1969. See dimensions W and h in. - Series F couplings supplied with 4) All dimensions per AGMA 9002-A86 interference fit bores without set screws commercial standards. 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. Thin parallel keys and their corresponding keyways (Dimensions in millimetres) Thin taper keys with or without gib head and their corresponding keyways (Dimensions in millimetres) Straight cylindrical involute splines — Metric. Metric Key Keyway Dimensions Per ISO/R773 - Js9 Width Tolerance. Because keyways are milled into the side of shafts using a rotating cutter, the entry and exit points of the cutter into the shaft form a rounded slot. tolerances and fits for metric bores and keyways. 90 £49. See dimensions W and h in Figure 1. Keyway. 4. 1) The tolerance zone for hub keyway width b for parallel keys with normal fit is ISO JS9 and with close fit ISO P9. To meet your requirements, KHK's spur gears are made in a variety of styles. The essential data for this standard have been extracted from ISO Recommendations R 7731) and R 7742). METRIC KEYSTOCK. Supplied complete with the necessary shims to cut keyways to standard depth. Total Height (X) = Depth (Y) =. Shaft: Key: Keyway: Nominal Diameter d: Section b x h : Width Shaft & Hub b: Depth. Metric keyways are dimensioned by width and depth as measured from the radius of the shaft to the center of the keyway. all dimensions in inches. The keyway dimensions are also different from the English system.