Standard shaft keyways. This is according the DIN OK. Standard shaft keyways

 
 This is according the DIN OKStandard shaft keyways  Custom and interrupted keyways machined with quick turnaround; Keyed shafts can be furnished with a key already inserted, assuring a proper fit; Ground to a mirror finish of RMS 8 or better

A key prevents a relative rotation between the two parts, and may enable torque transmission to occur. Shaft keyway tapered taper keyways bores wxhParallel key dimensions keyway metric keys rectangular 1958 imperial Keyways keys dimensions metric parallel tolerances engineering fit bs 1972Positive infinite variable gearbox,conveyor chains,couplings,universal. 1265 0. Inc. 000 -0. 3 mm, but the shaft had a keyway width value of 9. Shaft and hub keyway dimensions. d w +0. For more information, to get a formal quote on 2" keyed shaft, or for pricing on any of its accompanying components/ accessories please contact us and we will be happy to assist you. Index the adapter 180 degrees on rotor shaft (see Figure 6-22 C). depth tol. If a key is to be fitted place it in the shaft keyway before fitting the bush. 039. a) End-milled or prole keyway b) Sled-runner keyway. All Keyways are parallel and to British Standard 46: Part 1: 1958, with the exception of those marked* which are shallower. 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” Shaft Diameter vs Key Sizes Design Recommendations. 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. 250"+. This Standard covers requirements for square and rectangular parallel keys and keyways intended for both alignment of shafts and hubs, and transmitting torque between shafts and hubs. Woodruff keys work well near shaft shoulders and on tapered shafts. Cut keys to custom lengths. Check Details. 250"+. 25. If the enduser is using oversize plated keystock, then the properly centered keyway is more important. (2000+HP) shafts had their keyways worn to the point the shaft needed to be turned from solid 4140 anew. Using shape optimization by providing chamfer and fillet at corners, it is shown that. Mm Shaft Diameter Groove dimensions for woodruff keys DIN 6888. all dimensions in inches. 251 +0. scope: This standard establishes a uniform relationship between shaft size and key size for parallel and taper keys retaining similar basic sizing as found in the withdrawn B17. 3. 1 Class 1 standards for dimensions and tolerances. A Shaft key is a piece of metal used to connect a rotating machine element to the shaft. . Shaft with Two Keyways Torque Applied Deformation and Stress Equations and Calculator. 75 inches (19. The length of the exposed shaft is approximately 7 inches. Using a hexagon socket wrench (DIN911) gradually tighten the grub cap screws in accordanceProduct Description. 2-1967. ANSI/AGMA 9002-C14. We can provide keyed shafts in any length up to 20 foot. Standard Metric Keys and Keyway Bores. 1. 1) The length I is a function of the design. standard product offering consists of over 4000 shaft collars, rigid shaft couplings and specialty mechanical components. Recommended ANSI Standard Keys and Keyseats Design per. Specification. 3mm 2. Shaft keyway keyways bores t2 chains wxh. It is a standard form of key and maybe either have a rectangular or square cross-section. Key height: 25mm. --keyway dimensions Keyway sizing chartDimensions standard keyseat keyway shaft shafts diameter nominal. Only informative sections of standards are publicly available. 8M high quality products and 80 sextillion configurable parts available with fast shipping and low pricing. 7/11Ansi B17 1 Standard Keyway Dimensions LowellcorpAs this ansi b17 1 standard keyway dimensions lowellcorp, it ends up living thing one of the favored ebook ansi b17 1 standard keyway dimensions lowellcorp collections that we have. The key and key seat cross section are ISO standardized. 48 products. 3) of the diameter of the shaft, in which case the thickness of the key (T) becomes ?40 (0. Check out our shaft keyway size chart as well to help you identify your needs. It is desired that there is a minimum amount of rotational play. The Tsubaki POWER-LOCK can also support axial loads, where force is applied through the axis of the shaft-hub connection. Tube Cleaners. 16-0. Stress fields and corresponding torsional-fatigue cracks in shafts with keyways or splines are shown in Figure 2-22. We stock pre keyed shafting in many diameters, including metric diameters, with standard keyways. Key dimensions: Parallel keys are most commonly used. The advantage of the Js9 tolerance is that the key can beKeys shaft rectangular types key chart hub designs tapered machine selection5/8" od keyed shafting with a 3/16" full keyway Metric key keyway dimensions per iso/rtt3 js9 widthMetric key keyway dimensions. 8 6. standard keyseat be used in the shaft in all cases. The first is Js9. Check Details. Standard Metric Keys Keyways for Metric Bores with One Key Keyway Cutter Hole Keyway Dimensional Data for MIlling Centers and Arbors - ANSI/ASME B94. Standard and metric keyway broachesTable aii-12. pdf. The Stafford Manufacturing Corp. Or clamp the machine to a flat surface, and you can cut motor mount slots. Title: keyway dimensions. Precision machined, non-marring, easy to adjust, with high clamping power. Box 12086 Omaha, NE 68112-2086A Key is used on a shaft keyway to retain mechanical power transmission components such as gear drives and pulleys to transmit power. Hollow saddle keys. Motors and gearboxes that generate high torque and acceleration may make shaft keys obsolete. Click here to purchase the full version from the ANSI store. 000 for all standard keyways BORE, KEYWAY & SET SCREW INFORMATION MECHANICAL P. The one edge of the shaft is completely inside the shaft side. (i. DIN-Keys & Keyways to ISO Diameter d in accordance to DIN 6885/1 in accordance to DIN 6885/3 above to Width b 1) Depth h Shaft Keyway Depth t₁ Hub Keyway Depth d = t₂ Width b 2) Depth h Shaft Keyway Depth t₁ Hub Keyway Depth d = t₂ mm mm mm mm mm mm mm. 3). Tapers - charts and how to measure. 4. Step Machine Key Stock. where, the Standard Dimension for key = 14mm x 9 mm. Unless otherwise specified, the shaft keyway is assumed to be standard. JHG. Parallel keysKeyway shaft roymech tolerance Shaft standard key sizes rectangular gates keys diameters most non std readily availableParallel metric keys and keyway dimensions. The deviations are less than the basic size. 2. 1. Good for use with square- and hex-profile shafts, these aluminum supports also work with round shafts of any diameter up to. This standard does not apply to: - couplings attached to shafts without keys, see ANSI/AGMA 9103-B08;A shaft key is a small metallic component mounted between the shaft and hub to restrict the relative motion. 4: Shaft with overhung gear Example -Homework Problem 9-2 5 9. 1910. We also have an Imperial Keyway Calculator. 4. To ensure an adequate factor of safety in the design of a shaft with standard keyway (width, one-quarter, and depth, one-eighth of shaft diameter), the former Code for Transmission Shafting tentatively recommended that shafts with keyways be designed on the basis of a solid circular shaft using not more than 75 percent of the working stress. 3) Keyway fillet radius to be specified by customer. Orthwein [4] suggested a designStandard keyways provide added torque capacity and fixed shaft phasing. 19-1997. = 55 MPa for shaft without keyway = 40 MPa for shaft with keyway . 1 Square Keyway Tolerances Minimum 2. Depends on application and cost. Key and keyway dimensions (control in motion) Keyway shaft coupling hole service couplings modification additional motion control tapered parallel Keyway chart. − S2 − S1 b 25 25 ℓ 1. These shafts have keyways only on the ends, leaving a plain shaft in the center. Gear Products and Suppliers | Gear Knowledge Menu. The standard is primarily This International Standard specifies the dimensional characteristics of tangential keys and of their corresponding keyways in shaft and hub. Height. The adaptor allows the measuring apparatus to rest on the top surface or outside diameter of the shaft so that the measuring apparatus can be used to measure the centrality of the side walls. They are also often used on tapered shafts. The information contained with ANSI/AGMA 9002-A86 did not necessarily agree with some commonly used specifications. 1The 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. Keyway toleranceKeyway-and-key-size-dimensions. metric bores with metric keyways, or shaft keyseat tolerances. If a conveyor must run without a cover, use an expanded. ). ISO/TC 14. Metric standard parallel keyway and key sizes shaft diameter (mm) keyway (mm) key (mm)*. A key prevents a relative rotation between the two parts, and may enable torque transmission to occur. 1 for imperial dimensions and DIN 6885 for metric dimensions. For shafts, the standard lengths are 5m, 6m and 7m but generally taken as 1m to 2m. Pul1 up on. 4. Standard keyways run full length. 28. 250 +0. Shallow keyway depths must exceed 2/3 of the full keyway depth of the square keys shown above. Standard keyway dimensionsStandard shaft sizes key bushing table qd non bore keys shallow range gates includes specific each also Keyway chartShaft and hub keyway dimensions. So you have to determine the chordal height of the diameter for the width of the keyway. Keyway metric key dimensions standard keyways keys bores shaft hub depth iso diameter engineering table edge width millimetersWoodruff ansi fasteners nominal Woodruff ansi metric keyway fasteners nominalParallel dimensions metric keyway key keys 1972. Use the set screw to further secure the key. still see lots of ordinary keyways in bigger shafts. Shaft Dia. +40 0. Made of carbon steel, they have high strength and are better than plastic gears and gear racks for high-load, high-speed, and heavy duty applications. Get In Touch. 1 12 4 4 4 13. Where can I obtain a copy of the metric standards?. Keyway Dimensions Key Dimensions The inch and metric dimensions here correspond to common values. 38 2. The second is a P9 tolerance. 260". exceptions are indicated on the respective standard sheet. 0Rotary Shafts - One End Tapped and Keyway Grooves. BS 5686:1986, ISO 14-1982: Specification for straight-sided splines for cylindrical shafts: metric nominal dimensions, tolerances and gauging requirements. 56000 KN/m2 for the shafts with allowance provided for keyways. This key stock is stepped to match repaired keyways in shafts or gears. Over To (Incl. The shaft is made from AISI 1020 cold-drawn steel. Shafts with keyways can catch clothing easily. D (Ø) Overall Length (mm) Body Material. Re: NEMA Motor Shaft Dimensions and Tolerances. S. Standard keyways provide added torque capacity and fixed shaft phasing. 18 1. C +0. Unless otherwise specified, the shaft keyway is assumed to be standard. Also, T 1 and T 2. 93. A rounded bottom allows these keys to rock in their seat to relieve stress on the shaft caused by vibration or misalignment. For more information, to get a formal quote on 3-7/16" keyed shaft, or for pricing on any of its accompanying components/ accessories please contact us and we will be happy to assist you. d. 38 0. The maximum stress in the standard metric shaft is 25 percent greater. Schlage uses CNC milling complex keyway shapes to mechanically prevent some non-OEM keys from entering or operating a lock. 25 is a group of 3 standards: B18. Inspection methods for straight and tapered bores and. Here, a case study taken on ball mill shaft keyway for investigation of stress concentration factor. O. Referencing Figure 1, the keyway dimension is W x T1. 125. Partially Keyed Rotary Shafts. 487 Minimum 2. 3mm 5mm 5mm 5mm 5mm 6mm 6mm 6mm 8mm 8mm 22mm 24mm 16mm 17mm 19mm 20mm 25mm Keyway Width (w) 10mm 3mm 3mm 1. If your measuring from the OD of the shaft there is a formula in Machinery Handbook to add that dimension to the half size of the key but don't depend on it for the right depth to cut to. Referencing Figure 1, the keyway dimension is W x T1. Box 12086 Omaha, NE 68112-2086 Along with keyway size tolerances and keyway depth sizes, some standards also provide information on the recommended key size and keyway depth as a function of shaft diameter. 5 3. It may be mildly magnetic. 8 4 4 Shaft (Arbor) Keyway Dimension Size Data - ANSI/ASME B94. The second is a P9 tolerance. 38 1. A key is a machine element that is used to join a rotating machine element to a shaft. It also gives the relation to be observed between the diameter of the shaft and the section of the key. Keyseat is a recess in the shaft and the Keyway is the recess in the hub to receive the key and thus securely lock the component. The slot is defined as a keyway or a. Total revolutions of shaft = 900x 10 6 revs. 3 6. Keys and keyways, splines. The key is then tightly fitted. Special keyway configurations. 4235 : PART 1 : 1972 Imperial – Rectangular B. [14] the frozen-stress photo elastic technique has been used to determine the complete surface stress field in empty keyways of British Standard proportions for rectangular keys. All keyed Shafting is guaranteed to fit on a bearing, and the ends can be. Tolerance each on T1 and T2 is -. Unless otherwise specified, the shaft keyway is assumed to be standard. Keyway dimensionsKeyway sizing chart Metric stepper motor shafts size data tableMetric key keyway dimensions per iso/rtt3 js9 width. Clean delicate surfaces inside tubes, pipes, and holes. Bore and Keyway dimensions comply with ANSI/AGMA 9002-B04 Standard. Saddle keys are one of the shaft key types which is installed on the surface of the shaft and not in the keyway on the shaft. ISO/TC 14. B. This key seems undersized on both counts. Unit 2 design of shaft. Reference The nominal sizes given in ( ) do not conform to the relevant international standard and must not be used in new design. Keyway (Hub) Radius r. Parallel keysKeyway shaft roymech tolerance Shaft standard key sizes rectangular gates keys diameters most non std readily availableParallel metric keys and keyway dimensions. The connection level key is placed in the keyway of the shaft and shaft parts. e. 010 0. Appropriate fits can be established for each shaft size and published in a standard. Key dimensions: Parallel keys are most commonly used. 424 Minimum 2. In this paper, we perform the stress. 5 inches (38. benmychree John York. To use a key as a sacrificial part, choose a softer key that will shear off. 4 9. Key (engineering) In mechanical engineering, a key is a machine element used to connect a rotating machine element to a shaft. 010". . They conform to ANSI B17. 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. 13. Width b: Depth : Radius R: Nom: Tolerance Class: Shaft t 1: Hub t 2: Normal: Close: Shaft N9: Hub Js9: Shaft & Hub P6:. 1. Max. Keyway metric key iso dimensions standard keyways keys r773 pdf bores shaft hub depth diameter standards engineering table edge widthKeyway tolerances bore Keyway dimensions table aiiShaft standard key sizes rectangular gates keys diameters most non std readily available. The width of the key (W) is 350 (0. 4. 1. Combine gears with different numbers of teeth to change speed and torque in your assembly. The introduction of a DIN or ANSI standard keyway into a shaft normally reduces the shaft radius by 20 to 25%, and often as much as 50%. 1 . All keyed Shafting is guaranteed to fit on a bearing, and the ends can. When selecting a keyway tolerance, there are two common selec-tions in the metric system. Unless otherwise specified, the shaft keyway is assumed to be standard. 024 +0. Standard External Metric Thread and Fastener Sizes M 0. When a keyway is damaged, cut a new, wider one. Likewise, the keyway height must be 3. ANSI/AGMA 9002-A86 was based upon the design criteria related to bores and keyways in coupling hubs that had evolved over many years of successful industry practice. That combined amount of clearance forgives a few thousandths of off-centeredness to a shaft keyway. The profile keyway is cut by an end-mill while the sled-runner keyway is cut by an ordinary milling cutter. 0mm metric, standardShaft standard key sizes rectangular gates keys diameters most non std readily available Chart keyway torqueKeyway metric key dimensions standard keyways keys bores shaft hub depth iso diameter engineering table edge width millimeters. They’re used in a wide range of industrial and consumer OEM and MRO applications, including: Power transmission. Keyway misumiKey and keyway dimensions (control in motion) Keyway sizing chartMetric key keyway dimensions. D,d Depth. Phone: (407) 347-3519. 1 +0. 15. Woodruff Key Assortments. D. No welding required. 3 h 1 2t t h d c c h b 6. 015. A further disadvantage to shaft keys in a world of increasingly compact motion components is the reduction in the torque density of the shaft and its respective locking element. Design of Square Key and Keyway (Wood Ruff) Stress, Shear and Torque Equations and Calculator. 6 - 8 - 10 - 12 - 14 - 16 - 18 - 20 - 22 - 25 - 28 - 32. Set screws and pins can also work as an alternative to the keyed joint. Clearance Fit Bore Tol. As noted above, when selecting a keyway tolerance, there are two common selections in the metric system. 1875 0. 125 0. js9 widt. 25. The keyway in the shaft is in the form Of a semicircular recess with the same Fig. Re-design the shaft shown below to be a uniform,Metric woodruff keys are supplied to din 6888 / iso 3912 in c45k key All torque transmissions resourcesKeyway chart bore resources torque alltorquetransmissions. REFERENCE DEPTH. This is a +/- band clearance; the value of the. 018 0RoyMech Resources Keyways BS 46 :1958 Parallel Keys and Keyway Dimensions These Pages include various standards. Stocked in: Steel; Stainless Steel; Specifications. . S. That is, for a 1/2" key the depth of the keyway would be . ASME Code for steel purchased under definite specificationsstandard keyway design in section 5. Also calculated are the overall measurements for shaft and bore, as well as the chord height. 5. # 11. Another name for a Keyway is a. 5000 2. The invention is directed to an adaptor device suitable for use with a measuring apparatus to determine the centrality to the centerline of a Woodruff keyway in a shaft. This standard is applicable to couplings as defined in ANSI/AGMA 9009-D02, Flexible Couplings - Nomenclature for Flexible Couplings, with metric bores and keyways. These easy-to-adjust components maintain perpendicularity to <0. Keyway metric key iso dimensions standard keyways keys r773 pdf bores shaft hub depth diameter standards engineering table. Keyway Bore (inches) Reference Height (d) 1. comParallel Shaft Keys. 1 Bar Stock - General purpose, negative toi- and taper keys retaining similar basic sizing a s eranced, cold finished steel stock for found in the withdrawn B17. Width. We stock pre keyed shafting in many diameters, including metric diameters, with standard keyways. Cutting an internal keyway can be a challenging task, but with the right method and tools, it can be done with precision and efficiency. . Tony, a 1/4" keyway is standard on 1" diameters. 000 / +0. 5 SHAPE, DIMENSIONS AND TOLERANCES OF KEYWAYS 8 -4 X Sect ion X-X Detail A Vaiues in millimetres Shaft Keyl ) Keyway Diameter d Width b Depth*) Sect ion bXh Radius r Tolerante for class fit Free Normal Close Shaft tl Shaft Hub Hub and hub H9 DIO IV9 Js9 P9 nom. The taper is 1/8” per foot. Offered in two styles:For more information, to get a formal quote on 2-3/16" keyed shaft, or for pricing on any of its accompanying components/ accessories please contact us and we will be happy to assist you. Undersized Key Stock Assortments. 020 0. . These keys have a tapered body that wedges in to the keyway for a more secure fit than standard machine keys. Related terms:. 5 1. 3mm. Specifying English Keyways In the English system, it is standard practice to dimension keyways. 8mm 2. The key length should be less than about 1. The entire setup is referred to as a keyed joint. Make sure 'lock-tight' is used on the set screw or make the screw long enough to use a nut to wedge it tight for vibration resiistance. See ANSI/AGMA 9112--A04 for metric bores with metric keyways. 1 d1(or d) (Ø) O. keyway dimensions metric keyways diameter key shaft hub over incl w h width depth tol. 6. 025 2 0-0. Technical Data: rated torque from 10 - 800 Nm shaft diameter from 5 - 72 mm. 3mm 3. The KM3000 Portable Key Mill is a simple, rugged, dependable machine tool designed to cut keyways in shafts without costly set-up time or dismantling of the work piece. 2 0. We can provide keyed shafts in any length up to 20 foot. 9-11, and 9-12 Figure 9. The key length should be less than about 1. 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 Keys and keyways. Definition of shaft Standard shaft sizes Standard shaft materials Design of shaft based on strength 8. I am designing a part that has two keyways 180 degrees apart on a single large diameter shaft. Since most inch shaft Tolerancing is controlled by NEMA and/or AGMA, (both standards agree up to 6. Cutting a standard keyseat in a shaft and in a gear or sprocket will give a nice tap fit for the key. The standard sizes of machine shafts are up to 25 mm with a 5 mm step. the depth of a keyway is an important taken every Shaft keyway depth calculatorKeyway misumi. 000 so that there is no. Standard keyways provide added torque capacity and fixed shaft phasing. width tol. The first is Js9. It might be worth roughing the keyway underwidth by 1/16" and then profile cut both sides with a nice sharp carbide to straighten. It cannot be used as a feather. All hubs supplied standard with one set screw. In stock and ready to ship. 6 1. - Series F couplings supplied with 4) All dimensions per AGMA 9002-A86 The hub keyway is dimensioned by its width and depth on the shaft – keyway sides. LargerRuland’s variety of standard shaft collars and couplings allows designers working with motors or at a motor manufacturer to specify the right component based on the application requirements. AUTOMATION & IIOT. 19-1997. 1/4’’ keyways. British Standard :BS 46 Part 1 : 1958 Keys and keyways and taper pins. Our 5/8-inch keyed shaft is made with industrial needs in mind, but there are variations. 02 to 118 inch. It is a rotating member, in. 3 N) When I calculate with this data I reach a safety factor of 1,08. Keyways play a crucial role in mechanical systems, enabling power transmission between shafts and other machine elements. clearance fit bores with set screws. - Series F couplings supplied with 4) All dimensions per AGMA 9002-A86Standard keyway sizes chartStandard keyway dimensions Metric key keyway dimensions per iso/r773. Get a quote +61 7 3271 5424. Fit pulley with taper bush on shaft and locate in desired position. 19-1997 ; Keyway Stresses for Non-metallic Gears and Shafts Formulas and Calculator; Shaft (Arbor) Keyway Dimensionl Data - ANSI/ASME B94. 1. Coupling Length: 11. Shaft Diameter. xx / -0. Key. Drive Type Fastenings without Taper Action; Parallel Keys, Keyways, Deep Pattern. 015-0. 18 3. F. Check Details. 0005 inch per inch of length for keyseat lengths. KEYSHAFT Keyed Shaft, Diameter 3/4 in, Keyway 3/16 in x 3/32 in. The hub keyway is dimensioned by its width and depth on the shaft – keyway sides. 003, -. Keyway (Hub) Radius r. Inspection methods for straight and tapered bores and. What does H8 tolerance mean? H8 (hole) tolerance range = +0. Keyway is not made for holes of less than 12 mm. Shaft Keyseats/Hub Keyways Standard Keyseats/Keyways. STAFFORD STEEL CLAMP-TYPE SHAFT COUPLINGS WITH KEYWAYS: DIMENSIONS: ONE PIECE STEEL: TWO PIECE STEEL: KEYWAY: BORE. 2) Dimension h of the taper key names the largest height of the key, and dimension t z largest depth of the hub keyway. The height of metric keys decreases by 1 mm for every 100 mm of length. In stock and ready to ship. These keys have a tapered body that wedges in to the keyway for a more secure fit than standard machine keys. Shaft Arbor and Keyseat Dimensional Data American National Standard Keys and Keyways; Standard Metric Keys Keyways for Metric Bores with One Key; Keyway Cutter Hole Keyway Dimensional Data for MIlling Centers and Arbors - ANSI/ASME B94. 3D Printing & CAD. 1875 0. For a key to function properly, both the shaft and rotating elements (gear, pulley and coupling) must have a keyway and a keyseat. 5 +. The function of the key and keyway is to prevent relative motion between shaft and hub. For use on standard hardened round shafts, Shaft Adapters are precision machined, non-marring, easy to adjust, with high clamping power. Read more on how keys and keyways work and what types are available – Keys and Keyways. Unless otherwise specified, the shaft keyway is assumed. Convert output drives from female to male. 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. 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. The second is a P9 tolerance. The shaft key is a machined element used for connecting the transmission shaft to rotating parts like gear.