In stock and ready to ship. Metric standard keyway sizes_联轴器厂家-guangzhou link automation140pcs assortment 30mm keys 16mm x20mm 10mm Sae to metric conversions for hex keys chart imageFwb lengths metric. com. Woodruff Keys Max 0. 5 +. Other popular sizes include; 9m x 5m, 10m x 7m and the FIBA 3x3. 0mm Metric - Standard Sizes. Dimension standards: ISO 2982-2:. 360 Minimum 2. The usage of these tolerances is advised for economic reasons. Design of Square Key and Keyway (Wood Ruff) Stress, Shear and Torque. Max. Shaft and Hub Keyway and Key Sizes dpk3n3gg92jwt. 1. 000/-0. Key strength and steel analysis entering into the makeup of stock for keys is not within the. ANSI-B17. Key Length DIN 6885. Created Date:Shaft Key Seat Depth Control Values S and T for Shaft and Hub ANSI B17. We offer a comprehensive selection of more than 27,000 miniature and specialty cutting tools that are all fully stocked. These are standard metric-sized reamers. Shaft Keyway Shear and Yield Strength Formulae and Calculator. Carbide Staggered-Tooth Keyseat End Mills. 5 mm. 03 Bore Dia. based on the table on webpage Factors. 8mm 2. net. The parallel keyway milling process starts by cutting a simple keyway slot, all the way through the axial diameter of the part. - inch bores with metric keyways; - metric bores with inch keyways; - metric bores with metric keyways; or - shaft keyseat tolerances. 25 - M 1. Over To (Incl. Keystock is available in both inch and metric sizes. Supplies and solutions for every industry, plus easy ordering, fast delivery and 24/7 customer support. (ISO). 4mm 8mm 2mm 9mm 12mm 11mm 4mm 4mm 14mm 15mm DIN 7154, H7 Metric Bore and DIN 6885, Js9 Square Keyway Tolerances Page 1 of 4 British ISO Metric Screw Threads Designations. 8mm 2. Woodruff key cutter size chartStandard woodruff keys Shaft standard key sizes rectangular gates keys diameters most non std readily availableKeyway key. 8mm 1. The tables below show the dimensions of a straight sided spline in accordance with BS 5686:1986, ISO 14-1982: Specification for straight-sided splines for cylindrical shafts: metric nominal dimensions, tolerances and gauging requirements. In the National basketball Association (NBA), the court is 28. Note that this standard is a pure metric standard, and not a metric conversion of ANSI/AGMA 9002-C14 (Inch Series). Unless stated otherwise, hub torque and horsepower ratings assume a SOX (NBR) rubber spider is being used. 5 in (170 mm). Bushings for smaller arbor holes are collared for easier handling. Ref Standard . Use the keyways with machine keys to transmit torque to gears, sprockets, and other keyed components. keyways & keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keys Rectangular Keyways Metric; WXHKey W x T2 Keyway ISO Standard — mm Snart Dlameter WI dth Groove dimensions keys DIN 6E-ga Shut 1 (With • 1972. See dimensions W and h in Figure 1. Appendix B Approximate equivalents of metric and inch units 22 Figure 1 — Variation in keyway depth in taper shaft 19 Figure 2 — Types of key and position of keyway in shaft 18 Table 1 — Rectangular parallel keys, keyways and keybars 4 Table 2 — Square parallel keys, keyways and keybars 6PREFERRED FITS AND TOLERANCES CHARTS (ISO & ANSI METRIC STANDARDS) Preferred fits and tolerance table for hole and shaft basis systems which are given in ISO 286-1 (2010) and ANSI B4. Metric Standard Parallel Keyway and Key Sizes Shaft Diameter (mm) Keyway (mm) Key (mm)*. 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. 414 Maximum 2. American National Standard --Bores and Keyways for Flexible Couplings (Metric Series) 1 Scope This standard presents metric dimensions, toler-ances, sizes and fits for straight bores, tapered bores, keys and keyways for unmounted industrial flexible couplings. Cylindrical and 1/10 conical shaft ends — Addendum 1: Checking of the depth of keyways in conical shaft ends. 020 0. It is important there-fore that Standards users ensure that they are in possession of the latest edition, and any amendments thereto. Index the adapter 180 degrees on rotor shaft (see Figure 6-22 C). ASTM Standard. Durable. Keyway Size Chart - Farrell BearingsStandard Calculator Bore Size. Custom shaft sizes and key sizes. Choose from our selection of steel metric key stock bars in a wide range. 3/64" 1/16" 3/32" 1/8" 5/32" 3/16" 1/4" 5/16" 3/8" Component. 8mm 3. The main difference between each of the hex cap screw standards is the width across the flats dimensions for the M10, M12, and M14. The height of inch keys decreases by 1/8" for every 12" of length. Metric module, side fit ? Part 2: Dimensions. At. Metric Size Carbide Round-Shank Reamers. KHK-USA The key to a proper fit for keyways Selecting the proper size keyway is determined by the shaft size. Since these U-joints have zero backlash (no play), there’s no motion lost when your shafts change direction, so machines move smoothly with more accurate, repeatable motion. View. Relevant British Standards. KEYWAY AND KEY SLOT DIMENSIONS METRIC. NA0139. DIN 472 circlips agujeros. As bushing bores approach the maximum recommended diameters, keyway depths are reduced in order to extend maximum bores as much as. width tol. , depending on the lock nut size Mounting slots according to DIN 981 HM/HME and HM . Typical steels for locknuts are: AISI, C1015, C1018, C1020, C1025, C1035, C1117, C1118, C1212, C1213, and C1215. Metric bores are defined in ISO standards while English bores are defined in AGMA and ANSI standards. All sizes are in inch units. Metric – Rectangular. Foreword. keyways available upon request. 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. Bore and Keyway Tolerance Table. For example, M10 or M10-6g, by default, specifies M10 x 1. Metric Key & Keyway Dimensions Per ISO/R773 – P9 Width Tolerance . 1/8″ B Type HSS Keyway Broach; 3/16″ B Type HSS Keyway Broach; 5/32″ B Type HSS Keyway Broach; 5/8″ B Type Collard Bushing (1) 8mm C-1 Type HSS Keyway Broach; 20mm C Type Collard Bushing; 7mm C Type HSS Keyway Broach; 6mm C-1 Type HSS Keyway Broach (1)The keyway is a longitudinal slot in both the shaft and mating part. MPTA. 002. (See Pg. EN Standard. Cutting Tools. 2515 0. Keys and keyways secure the hub and shaft to prevent relative movement between a power transmitting shaft and an attached component. DIN Standard. Keyway Width. The notes and tables below relate to straight cylindrical involute splines in accordance with BS ISO. Mechanical Power Transmission Association 6724 Lone Oak Blvd. 1. Keyway Js9 Tolerance Chart 173 255 205 43. ISO Standard. Design of Square Key and Keyway (Wood Ruff) Stress, Shear and Torque. Consent to Cookies & Data processing. com. Buy. Key Type. The usage of these tolerances is advised for economic reasons. Re-design the shaft shown below to be a uniform, s. Choose from our selection of metric keys in a wide range of styles and sizes. The sunk keys are of the following types : 1. Use individual keyway broaches in a variety of arbor hole sizes. These shafts have keyways only on the ends, leaving a plain shaft in the center. 44. 11, Forged Steel Fittings, Socket-Welding and Threaded;Unfortunately, misaligned keys and keyways can result in mechanical failures. Nominal. Standards such as BS 46, ANSI B17. Also known as sine keys. Style B - Sprocket with hub extension one side . Nom. For square and rectangular parallel keys three classes of fit, 'free', 'normal' and 'close', are foreseen. Cylindrical. Find the depths to cut in keyway and keyseat. Standard Metric Keys Keyways for Metric Engineers Edge. Includes Tapping Drill Sizes for Thread Cutting Taps 17 Inches Tall x 11 Inches Wide when folded out. = 1. Because of the intricate craftsmanship involved in fabricating a broach tool, this often involves weeks of production. Mechanical & Motion Systems. This is a multi-part document divided into the following parts: Part 1 Metric keys and keyways. 5000. If metric thread pitch designation (e. For instance, a "1/4 x 1/8" keyway has two sidewalls that are1/8 inch dep, shown as "d" in figure 1. Standard square profile range for Keysteel. Parallel Keys. Metric Roller Chain. Bushings rest inside the arbor hole of your workpiece and act as guides to ensure rigid and accurate keyway cutting. Module isDimensional Charts are for Metric Taper Keyways, Metric Taper Keys, Imperial Taper Keyways and Imperial Taper Keys. The Woodruff Key numbers indicate normal key dimensions. 16 Square Broaches Standard Square Broaches in the most popular American Standard. Constant-Tension V-Belt Pulleys A built -in spring maintains tension on your belt. Taper metric dimensions keyway key bs 1972 keyways keys. Fits and tolerance calculator for shaft and hole tolerance calculation according to ISO 286-1 and ANSI B4. 0005mm). pdf Key sizeKeyway metric key iso dimensions standard keyways r773 keys pdf bores shaft hub depth diameter standards engineering table edge width. dimensioned by its width and depth on the shaft keyway sides. All keyed Shafting is guaranteed to fit on a bearing, and the ends can be. The following Engineering calculator will show the plus and minus tolerance for the specific ISO 286 Shaft tolerance data. 14–15 Pull Type Production Keyway Broaches A full line of Industry Standard 500 and 600 Series and 5M and 6M Series Keyway Broaches are available. British Standard :BS 46 Part 1 : 1958 Keys and keyways and taper pins. Introduction. keyways /keys dimension in accordance with BS 4235-1:1972: Specification for. 3/32 X 3/64. This standard describes the ISO system of limits and fits for mating parts as it is approved for general engineering usage in the United States of America. ANSI Woodruff Keys. 5000 2. Use the middle of the shaft with bearings and other round-bore components. and even in the US where DP is mostly used, the module based gears which are called metric gears are becoming more widespread. British Standard Chain was developed before American-styled chain, but was limited in its development by what materials were readily available as roller chains evolved. Coping with foreign bore and keyway standards Machine Design. KEYS AND KEYWAYS. ELEMENTS OF METRIC GEAR TECHNOLOGY T-21 Diametral pitch (P d)is widely used in England and America to represent the tooth size. 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. 0005-. Variable spacing between the flutes reduces vibration, allowing these end mills to provide fast cuts, smooth finishes, and long tool life. recommendations except for the bore sizes marked * which are shallower. ANSI Sprocket Standard Keyway & Setscrews. Imperial Standard Bore and Keyway Info Service Manuals. Hub to Shaft. 2: Tolerances: KM/KML Metric thread, 5H: ISO 965-3 Axial run-out locating face/thread: 0,02 to 0,06 mm max. 19-1997; Design of Square Key and Keyway (Wood Ruff) Stress, Shear and Torque; Parallel Key. 1-1967, ASME standard B17. 1-1967, R1989) Metric Square & Rectangular Parallel Keys & Keyways (B. Key standard sizes shaft failure theories ppt powerpoint presentation diaMetric woodruff keys are supplied to din 6888 / iso 3912 in c45k key Keyway chartKeys standard metric keyways mechanical. Metric External Table Chart Thread Designations Sizes M 1. 6 Module Sizes And Standards Module m represents the size of involute gear tooth. This standard presents metric dimensions, tolerances, sizes and fits for straight bores, tapered bores, keys and keyways for unmounted industrial flexible couplings. AGMA ASA Keyway and Bores Design Data including dimension and tolerances. Keyways cut in certain area’s on the shaft. $7. organizations. Woodruff keys work well near shaft shoulders and on tapered shafts. In the Metric system it is common practice to specify the key size. Metric standard keyway sizes_联轴器厂家-guangzhou link automation140pcs assortment 30mm keys 16mm x20mm 10mm Sae to metric conversions for hex keys chart imageFwb lengths metric. All dimensions are given in inches. 001 TIR, allow for the attachment of gears,. Standard tolerancing on stainless keys and keyways. The hub keyway is. Bushings for smaller arbor holes are collared for easier handling. shaft to the center of the keyway. Judicious standard keyways 2019 . . Broach tooling is most often as customized as the workpiece that it will cut. Pilot hole for machining to desired bore size and configuration. They are semi-circular, and fit. 2 Normative references The following standards contain provisions which, throughreferenceinthistext,constituteprovisionsof this American National Standard. 3. Japanese Industrial Standard (JIS) Hex Fasteners. Standard Metric Keys Keyways for Metric Bores with One Key; Keyway Cutter Hole Keyway Dimensional. Standard Keyways and Setscrews Diameter of Shaft Keyway Width × Depth Setscrew Diameter of Shaft Keyway Width × Depth Setscrew 1/2 - 9/16 1/8 × 1/16 10-24 2 5/16 - 2 3/4 5/8 × 5/16 5/8 *Keyway Broaches. What standards organization impacts ASME standards for metric applications? International Standard Organization. 002/-0. Key KeyWay. 8mm 2. Metric Calculator Bore Size. It is ideal for overhung or unsupported shafts and is an excellent way to attach items such as mixer paddles and shaft Bore Diameter 1: 1. STANDARD. The key prevents relative rotation between the two parts and may enable torque transmission. Keys and keyways are a very important part of shafts and power transmission. 6 Hollow shaft with key - standard design The standard design uses the parts that are normally supplied with every hollow shaft, as shown in Figure 4. Standards by the ISO Council. The deviation determines if the feature will be. I can't find one for metric as all my book are for imperial. Couplings • Standard Metric Keys & Keyways for Metric Bores with One Key (Page 2 of 2) All Types . 010 inch, max is provided for offset (due to parallel displacement of keyseat centerline from centerline of shaft or bore) of keyseats in shaft. * These Width A values were set with the maximum keyseat (shaft) width as that figure which will receive a key with the greatest amount of looseness consistent with assuring the key's sticking in the keyseat (shaft). Threads are American National form, Class 3. Keys are made of steel. Keyway sizes: Out of stock: $297. 1-1967 or JIS B 1301-1996 specify sizes and tolerances of the keys and keyways. , depending on the lock nut. The bore diameters listed in the "Keyway Additional Modification Applicable Bore List" in the table below are available for the service. They’re also available in metric. Follow. donnu. Choose from our selection of metric keys in a wide range of styles and sizes. scope: This standard presents metric dimensions, tolerances, sizes and fits for straight bores, tapered bores, keys and keyways for unmounted industrial flexible couplings. As with all functions of the Machinist's Calculator, linear values can be converted between inch and millimeters, including the x,y. 376 . 4. Regions using "inch" units work with NEMA standards (see page NEMA Frame Size). Keyways will be furnished. Keys shaft rectangular types key chart hub designs tapered machine selectionStandard keyway size chart Metric woodruff keys are supplied to din 6888 / iso 3912 in c45k. 2-1967. Key . Woodruff keys and keywaysTruKey® Shafting from Keystone is designed to provide the straightest, most accurate keyed shafting, in the industry. 2) Dimension h of the taper key names the largest height of the key, and dimension t z. Google Rating. Google Rating. FOREWORD. 5. 40. NOMINAL SHAFT DIAMETER BOTTOM OF SHAFT TO BOTTOM OF KEYWAY WIDTH REFERENCE DEPTH 0. 774. Lidhujnk HSS Metric Keyway Broach Set, 22pcs Keyway Broach Collared Bushing Shim Set Metric Size Metal Processing Tool 4/5/6/8mm. Fast and simple to use mating component to a locknut. Standard metric keys keyways for metric bores with one keyKeys imperial machine table ansi parallel asme class key standard fit Keyway metric key iso dimensions standard keyways keys r773 pdf bores shaft hub depth diameter standards engineering table edge widthTable 11-1 key size vs. The last two digits give the nominal diameter B in eighths of an inch and the digits preceding the last two give the nominal width W in thirty. When a keyway is damaged, cut a new, wider one. The collar rests on top of the workpiece rather than being supported from below. Metric keyways are dimensioned by width and depth as measured from the radius of the. It is also possible to become a. txt) or read online for free. To confirm the status of any standard, identify the replacement standard if it is obsolete and/or purchase the standard please use. Single bearing supports use Type 1N. 0 2. S. This British Standard is the first of a series for metric keys and keyways and has been prepared under the authority of the Mechanical Engineering Industry Standards Committee. Home; Metric Keyways Index page; Parallel Keys and keyway Dimensions; Parallel Keys and keyway Dimensions to BS 4235-1:1972 KeyWay & Key Dimensions. 020 0. BB AK BD BG AA AB AC AF AJ The condensed dimensions shown on these pages are for general reference only and are not for construction. 1. 0284, email us, or fill out and submit our online request for quote form. Length of Screw Thread Engagement per. Tolerances h11 h9 h7 and h6 as shown in Table 6 1 The above shaft tolerances are now covered in the new ANSI B32 100 2005 standardOur inch & metric Dumont keyway broaches are made of high speed steel. Standard L Type coupling hub materials are either sintered iron (L035-L190) or cast iron (L225-L276). 3750 0. Available in metric sizes, these 18-8 stainless steel. DOWNLOADS. We welcome export enquiries for key steel. 0. Keyway additional modification is available for both single. 5. Standard Pin Taper The standard pin taper is a self holding type taper. Generally, there are two classes of stock available for sunk keys, mainly parallel keys. 19-1997; Design of Square Key and Keyway (Wood Ruff. 1/16 in; 3/32 in; 1/8 in; 5/32 in; 3/16 in; 1/4 in. Home; Metric Keyways Index page; Parallel Keys and keyway Dimensions; Parallel Keys and keyway Dimensions to BS 4235-1:1972 KeyWay & Key Dimensions. Certified drawings of all ratings are available for construction purposes. 2 Normative references. The following table includes standard rectangular shaft key sizes for shaft diameters ranging from 5/16" to 9": Standard rectangular key stock is readily available from most Gates Industrial Distributors. Keyway Width. for example, a hobbing machine, and deburring. They conform to ANSI B17. Use them to connect gears and other components with tapered keyways to shafts. Companion pulleys contain integral spokes which run radially on the pulley. 2-1978 standards. Metric Remachinable One-Piece Split Coupling with Keyways (22) Fully metric, including clamp screws. These metric set screws have good chemical resistance. A description is not available for this item. 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. 0mm to 26. Nearly every shaft diameter has a corresponding standard keyway width and depth – this calculator helps you find it. You are here: Home > Knowledge Base > Standard Keyway Dimensions. These are standard metric-sized reamers. 34109. metric keyways, metric bores with inch keyways, metric bores with metric keyways, or shaft keyseat tolerances. Standard tolerancing on stainless keys and keyways Standard tolerancing on stainless keys and keyways to broach a keyway in bore with in 0005 tolerance with no. 062 0. com. Because this key stock is slightly larger than standard key stock, keys will fit tightly in worn keyways. Fractional inch and metric are measurement systems used to express the size of items that have standard trade sizes. Couplings • Standard Metric Keys & Keyways for Metric Bores with One Key (Page 2 of 2) All Types . KEYWAY AND KEY SLOT DIMENSIONS METRIC. Use individual keyway broaches in a variety of arbor hole sizes. keyways available upon request. Did. keyways available upon request. In addition to the standard sprockets, special sprockets may be available in the same styles . Square Drives for Socket Tools ASA B5. 250 Internal Retaining Snap Ring Sizes and Groove Design Chart; Metric Tapered Retaining Snap Rings Size Chart Metric size retaining snap rings per. 062 0. Specifying Metric Keyways Dimensioning and specifying Metric keys and keyways varies significantly from the English system. 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. depth tol. Browse L Type Hubs without Keyway - Metric Bores in the The Timken Company catalog including Part Number,Description ,Bore Size,Coupling Size,Keyway Size (W x D),Length thru Bore,Hub Length,Outer Diameter,CAD. Contact Us. Gear Products and Suppliers | Gear Knowledge Menu. Read more on how keys and keyways work and what types are available – Keys and Keyways. Shaft Key Seat Depth Control Values S and T for Shaft and Hub ANSI B17. Keyway Bore Diameter Size Bore Reference -0. 3mm 2. When one end wears out, switch to the opposite end for two times the life of a standard carbide end mill. /4 5/. Steel key stock is an economical choice with good strength. Displaced 90° From Keyway Center. H is the key height. Also see Table of Hole Tolerances per. Keys standard metric keyways mechanical. C, Cotter Pin Hole has centerline. The teeth are sized to fit into. British Standard Metric Keyways for Square and Rectan; gular Parallel Keys BS 4235:Part 1:1972 (1986) Sat — ey eyeay Tonimal Diameter d Width,b Depth Radius r pw | 3% Free Fit Nonal Fit lose Fi Shalt, Tab over | ‘and | 2% | pom, [Stak | Rab] Stat] Ba | Shaman. key way & key. Standard keyway dimensionsKeyway chart Keyshaft keyed shaft,. Ultimate tensile strength 580MPa, Yield stress approx 300 MPa. KEYWAY: A rectangular opening formed by matching rectangular slots cut axially (lengthwise) along both the coupling bore and shaft. Recommended uniform relationship between shaft diameter and key sizes for parallel and taper keys. All internal calculations are done in metric millimeters to a precision of up to half a micron (0. Chain. 020 0. All torque transmissions keyway sizes archives all torque. Approximate equivalents of metric and inch units 32. This specification includes index tolerances for multiple keyways. For example, an ANSI 202 measures 1/16 x 1/4, while ANSI 1012 measures 5/16 x 1 1/2. The essential data for this standard have been extracted from ISO Recommendations R 7731) and R 7742). The following tables show standard dimensions for keys and their grooves. Shaft Collars. Standard Metric Keys & Keyways for Metric Bores with One Key • Couplings All Types (Page 1 of 2) Renord 21 S Moorland d ew Berlin March reision Telephone a Supersedes Key & Keyway Dimensions – Millimeters Coupling Hub Keyway Dimensions – Inches. Scribd is the world's largest social reading and publishing site. Rather than enjoying a good book with a cup of tea in the afternoon, instead they juggled with some malicious virus inside their computer. December 30, 2020. 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 Standard Metric Keys Keyways for Metric Bores with One Key; Keyway Cutter Hole Keyway Dimensional Data for MIlling Centers and Arbors - ANSI/ASME B94. Woodruff keys and keywaysTruKey® Shafting from Keystone is designed to provide the straightest, most accurate keyed shafting, in the industry. Email. Simcut BF Keyway Broaching discourse. BS 970, Wrought steels in the form of blooms, billets, bars and forgings. Woodruff Keys. Referencing Figure 1, the keyway dimension is W x T 1. [email protected] width P9 tight fit (standard design) JS9 or N9 loose fit (requires written agreement) see also. Key-Depth Tolerance is +. European norm specifications are. Locate keyways per Figure 6 and Table 8. ANSI/ASME B16. METRIC BORES AND KEYWAYS Keyways are British Standard Metric B. NSI Shaft and Hub Keyseat Dimensions for Woodruff Keys per. All dimensions are given in inches. O. ISO 286Application error: a client-side exception has occurred (see the browser console for more information). The usual proportions of this key are : Width of key, w = d / 4 ; and thickness of key, t = 2. DIN 6885A Steel Plain. BARR. Shaft (Arbor) Keyway Dimension Size Data -. Get In Touch. 3/8. 4375. 312 / 2. They are also often used on tapered shafts. * These Width A values were set with the maximum keyseat (shaft) width as that figure which will receive a key with the greatest amount of looseness consistent with assuring the key's sticking in the keyseat (shaft). The sunk keys are provided half in the keyway of the shaft and half in the keyway of the hub or boss of the pulley. This key stock is stepped to match repaired keyways in shafts or gears. This is the most popular series of metric washers that is coupled with KM series metric locknuts. Follow. For example DIN 931 is for partially threaded coarse thread metric hex cap screws. Metric Standard Parallel Keyway and Key Sizes Shaft Diameter (mm) Keyway (mm) Key (mm)*. 125 0. Pre-cut key stock is available in standard inch and metric sizes. reconstructingjudaism. Parallel keys are the most common form of keyway. Undersized Machine Key Assortments Since they fit more loosely than standard keys, these undersized keys are best for uneven keyways or when you need to disassemble parts frequently, such as during maintenance or prototyping. 99 #22.