25 is a group of 3 standards: B18. 4 9. 3) Keyway fillet radius to be specified by customer. b x h width x thck. Reference 'Machinery's Handbook'. 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. In Figure 2-22 a, the fillet in one corner of the keyway was radiused. However, the keyway width recommended for the same standard is 6. 004, then the shaft keyway should be 0. D. 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. Keyways cut in certain area’s on the shaft. Parallel keysKeyway shaft roymech tolerance Shaft standard key sizes rectangular gates keys diameters most non std readily availableParallel metric keys and keyway dimensions. Ruland disc couplings are manufactured in clamp or set screw style, with or without keyways, in bores sizes from 1/8” to 1-1/4” and. clearance fit bores with set screws. 010 0. Rigid shaft couplings are available with or without keyways in one- and two-piece and set screw designs. Keyway Connection. Stress fields and corresponding torsional-fatigue cracks in shafts with keyways or splines are shown in Figure 2-22. Standard keyways provide added torque capacity and fixed shaft phasing. Referencing Figure 1, the keyway dimension is W x T1. I would specify location tolerances separately on the length of your first keyway, and on the width and length of your second keyway. 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. In this comprehensive guide, we will discuss seven popular internal keyway cutting methods. 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. Using shape optimization by providing chamfer and fillet at corners, it is shown that. 8 6. 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. 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. metric bores with metric keyways, or shaft keyseat tolerances. pdf. 125. Keyway metric dimensions key iso tolerance js9 r773 width per depth hub t2 height radius text mill question answered hasnSolved 5. MISUMI USA has all of your Universal Joints needs covered, with over 3. A frictional connection between shaft and component solves the problems associated with backlash, and additionally eliminates the machining operations required for keyways. 9" shafts 10 feet long. I'm reverse engineering a shaft with impellers that have these rounded keyways, but I need to know what the clearance should be between the hub and the top of the key and the rest of the. powerhound (Mechanical) 10 Mar 08 23:14. One of the following methods should be used to specify keyways: Metric: WxH Key W x T2 Keyway British: WxH12 Key W x H Keyway ISO Standard-mm Imperial -Inches 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. 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. (2000+HP) shafts had their keyways worn to the point the shaft needed to be turned from solid 4140 anew. scope: This standard presents inch dimensions, tolerances, and sizes for straight bores, tapered bores, single keys and keyways for unmounted industrial flexible couplings. All sizes are in inch units. 020 0. 18 3. To use a key as a sacrificial part, choose a softer key that will shear off. 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. 015-0. 2 Cross-section of prismatic part of parallel key-way, the coordinate system is placed at the shaft axis. Hub keyway b* P9 / N9 / H9 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 7 2 2 2 8 1 +0,1 5,8 1,2 +0,1. This is a ± band clearanceProblem that I see is that the bush is going to allow the key to "work" side to side, and to use a technical term, "waller" out the keyway, probably the shaft keyway. 3 6. S. The dimension from the top of the keyway to the opposite bore side. JHG. They can be made using a standard stock material such as key stock or custom machined to suit the application. Plastic Gears and GearRacks— 14 1/2° Pressure Angle. They conform to ANSI B17. 010 Height (d) (t) - DIM Keyway Width (w) AGMA 9002-A86 Inch Bore and ANSI B17. keyways /keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keys. EN Standard. 1910. 5. Often times you can kiss the key itself with a file to make it a nice fit. It also gives the relation to be observed between the diameter of the shaft and the section of the key. Keys and keyways secure the hub and shaft to prevent relative movement between a power transmitting shaft and an attached component. Re-design the shaft shown below to be a uniform,Keyway chart Shaft standard key sizes rectangular gates keys diameters most. still see lots of ordinary keyways in bigger shafts. Drive Type Fastenings without Taper Action; Parallel Keys, Keyways, Deep Pattern. This is an undersized clearance. 4 Prior to mounting the hubs, place the keys in the shaft keyways. Transeals - Keyway Chart. xls Author: KEITHTypes. While a designer is free to specify any keyway they wish, straying from the standard option is likely to increase the cost, time, and complexity of the part. 1-1967, ASME standard B17. Specification for metric keys and keyways –. 5 inches (38. While a designer is free to specify any. 6 6. . REFERENCE DEPTH. Nominal Dia. The automatic centering V-base is quick and easy to set up and clamps on any shaft from 1. Square Drives for Socket Tools ASA B5. Keyway dimensionsKeyway sizing chart Metric stepper motor shafts size data tableMetric key keyway dimensions per iso/rtt3 js9 width. 1. 000 for all standard keyways BORE, KEYWAY & SET SCREW INFORMATION MECHANICAL P. KeyWay. 18 1. While popular on external shaft keyways, milling is much less popular for cutting the inside. d w +0. 6. The standard is primarily This International Standard specifies the dimensional characteristics of tangential keys and of their corresponding keyways in shaft and hub. It cannot be used as a feather. This type of key is used in areas where frequent removal of the key is necessary. Key height: 25mm. 2) Dimension h of the taper key names the largest height of the key, and dimension t z largest depth of the hub keyway. It might be worth roughing the keyway underwidth by 1/16" and then profile cut both sides with a nice sharp carbide to straighten. Functional key length: 267,5mm (= length - (0,5x width)) Shaft material S355J2G3 (St52. 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. 1/2 to 3/16. 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. 2515 0. 15. Refer to Figures 4 and 5 and Tables 6 and 7 for recommended setscrew location and size. The prole keyway is cut by an end-mile while the sled-runner keyway is cut by an ordinary milling cutter. 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. 01~50. Shaft Size. The keys are square or rectangular. 1 . 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. Shaft standard key sizes rectangular gates keys diameters most non std readily availableMetric key keyway shaft standard keyways falk keys bores resources industrial Shaft and hub keyway dimensionsKey allen hex wrench keys set bolts types alley supply competitive prices details alibaba fairwell. 1045 Pre-Keyed Precision Ground Shafting, is a 1045 steel round that has been turned, ground and polished to a 32 RMS surface finish with a pre-machined full length keyway cut to ANSI standards. The one edge of the shaft is completely inside the shaft side. 0Rotary Shafts - One End Tapped and Keyway Grooves. Also calculated are the overall measurements for shaft and bore, as well as the chord height. 350 Maximum 2. Get In Touch. positioned on the shaft and the key slot and keyway are aligned, the taper key is inserted and pressed or hammered tightly into place. Shaft Diameter vs Key Sizes Design Recommendations Gear Products and Suppliers | Gear Knowledge Menu Recommended ANSI Standard Keys and Keyseats Design per. 3) Keyway fillet radius to be specified by customer. Fit pulley with taper bush on shaft and locate in desired position. Variations of machine keys include parallel keys, tapered keys, Woodruff keys, hi-pro keys, and non-rok keys. 002, -. [3/31/23] Straight Rotary Shafts with One End Tapped and Key Grooves are available in 1045 Carbon Steel or Equivalent and 304 Stainless Steel, with the following options for Surface Treatment : Black Oxide, and. The gib head makes them easy to remove when parts need to be taken apart frequently, such as for maintenance or prototyping. Mm Shaft Diameter Groove dimensions for woodruff keys DIN 6888. Unless otherwise specified, the shaft keyway is assumed to be standard. Read more on how keys and keyways work and what types are available – Keys and Keyways. Install them in keyways to transmit torque from shafts to gears and other components. Depth at forward end. 3 mm, but the shaft had a keyway width value of 9. 2-1967 Specification for metric keys and keyways – Parallel and taper keys BS 4235. Woodruff keys work well near shaft shoulders and on tapered shafts. They have a square or rectangular cross section. KEYSHAFT Keyed Shaft, Diameter 3/4 in, Keyway 3/16 in x 3/32 in. For shafts, the standard lengths are 5m, 6m and 7m but generally taken as 1m to 2m. [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. Direct interchange with Spicer 1000 series. International Standard IS0 3912 was developed by Technical Committee ISO/TC 14, Shafts for machinery and accessories, and was circulated to the member. Old JIS (Class 2) Standards Unit [mm] Hole diameter b2 t2 Key size b×h; Standard size Tolerance(E9. +40 0. The shaft's diameters that can be used are 3-inch, 4-inch and 4 5/16-inches. D. T h i s standard establishes a uniform relation-ship between shaft s i z e and key s i z e for parallel 2 . COPYRIGHT 2003; American Society of Mechanical Engineers Document provided by IHS Licensee=Cummins. Dimensions: Shaft Diameter (A): 2-15/16" Keyway Width (B): 3/4" Keyway Depth (C): 3/8" Shaft Material: 1018 Steel; Phone: (407) 347-3519 Email: sales. The designation of dimensions of taper keys and keyways are shown in Figure 4 and 5 respectively and are defined as follows: b – the cross-sectional width of the key h – the cross-sectional height of the key h1 – height of the gib head l – length of the key b1 – width of keyway for the shaft b2 – width of keyway for the hubKey (engineering) In mechanical engineering, a key is a machine element used to connect a rotating machine element to a shaft. 13. 12 mm. Key Stock is cold drawn to exacting tolerances with sharp corners, perpendicular and parallel sides, and smooth, bright surface finishes. keyways in the shaft members than to keyways in coupling hub bores. 4mm 1mm 1. Flat saddle keys. Tolerance each on T1 and T2 is -. 1. Keyway Width. A list of standard keyway and corresponding key sizes for English shafts are listed below in Table 1. ISO/R 774:1969. Standard Metric Keys Keyways for Metric Bores with One Key. If the enduser is using oversize plated keystock, then the properly centered keyway is more important. 1890 0. 95 6. ANSI B17. Inc. Related terms:. Welcome Location Transmission Bushes Pulleys Belts Vector Belts Roller Chain & Sprockets. 000. 000 +. Typical applications with these forces include indexing. 5 Power rating Power ratings of shafts are presented in Tables 2-7. Keyways Index. DIN 6885/2 Keyways d b P9/JS9 Hub keyway b P9/N9 Shaft keyway h t1 = d + t2 t2 t3 = d - t4 t4 11 4 4 4 12. Key (engineering) In mechanical engineering, a key is a machine element used to connect a rotating machine element to a shaft. 5020 2. 1 d1(or d) (Ø) O. Undersized Machine Key Assortments. 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. 018 0RoyMech Resources Keyways BS 46 :1958 Parallel Keys and Keyway Dimensions These Pages include various standards. Two PDFs with useful engineering data on keyway sizes and engineering limits and fits, just download. Common keystock materials include steel, stainless steel and plated with zinc and are supplied in standard lengths of 12” & 36″ lengths. 18 1. As bushing bores approach the maximum recommended diameters, keyway depths are reduced in order to extend maximum bores as much as possible. Index the adapter 180 degrees on rotor shaft (see Figure 6-22 C). Standard Keyway Size Chart. 18 3. 25 - M 1. 3 mm) in diameter with the standard bar clamp. 8mm 2. 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. 16-0. The advantage of the Js9 tolerance is that the key can be inserted and the gear manipulated without much difficulty. We stock pre keyed shafting in many diameters, including metric diameters, with standard keyways. 3 1. Keystock is available in both inch and metric sizes. Ann from the top of the shaft, the keyway is shown. 4. Find the depths to cut in keyway and keyseat. ANSI B18. When a keyway is damaged, cut a new, wider one. Check Details. Depends on application and cost. 75 to the calculated design stress if the section being considered includes a keyway. Unless otherwise specified, the shaft keyway is assumed to be standard. There are generally two keys we place between the shaft and hub as a tangency. Top. Combine a gear and. This is measured at the wall height not the depth of the cut from first contact with the diameter. DIN 6885-1 :- Key, Hub Keyway, Shaft Keyway Details and Dimensions. n Non-standard bores available – consult Lovejoy Engineering. Dimensions of shaft keys, standardized many years ago, are commonly considered to be the main concern in applying these devices. Keyways Index BS 46 Keys and keyway Dimensions-Parallel Rectangular Ref Standard . Inspection methods for straight and tapered bores and. The second is a P9 tolerance. 000 Min. However, designers tend to forget that other important. Specification. Shaft Dia. In the English system, it is standard practice to dimension keyways. ). 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. 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. xx / -0. . Machine keys are often the same material as the shaft and other components with which they are used. The center of the keyway is typically located 1/3 of the. ). Steel key stock is an economical choice with good strength. It helps to transmit torque. A rounded bottom allows these keys to rock in their seat to relieve stress on the shaft caused by vibration or misalignment. The keyway in the hub is made in the usual manner. Shaft and hub keyway dimensionsKeyways shaft keyway coupling shafts drive apart rotate two installing should asked driver question common am if when. 1 Square Keyway Tolerances Minimum 2. keyways in the shaft members than to keyways in coupling hub bores. In stock and ready to ship. • Machine elements such as gears, pulleys (sheaves), flywheels, clutches, and sprockets are mounted on the shaft and are used to transmit power from the driving. 6 - 8 - 10 - 12 - 14 - 16 - 18 - 20 - 22 - 25 - 28 - 32. Only informative sections of standards are publicly available. Standard Metric Keys Keyways for Metric Bores with One Key Keyway Cutter Hole Keyway Dimensional Data for MIlling Centers and Arbors - ANSI/ASME B94. Shaft keyways and keys are used to transmit torque from shafts to mechanical transmission elements such as gears, and pulleys, using a keyed joint. Ultimate tensile strength 580MPa, Yield stress approx 300 MPa. Keys are inserted inside the shaft and hub keyway to ensure the working of the complete system. BS 46 Rectangular Taper & Gib Head KeyWay & Key Dimensions All Dimensions in inches. 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. Choose from our. 1 “Keys and Keyseats”. The key is inserted inside the keyway parallel to the axis of the rotation. Inspection methods for straight and tapered bores and. Combine gears with different numbers of teeth to change speed and torque in your assembly. BS 4235-2:1977, ISO 3912-1977: Specification for metric keys and keyways - Woodruff keys and keyways. Coupling Length: 11. This is why you remain in the best website to look the incredible ebook to have. 120. Moore. 5 times the shaft diameter to ensure a good load distribution over the entire key length when the shaft loaded in torsion. pdf Gates belts, hoses, and applications: standard & non-standard. Get In Touch. 1/4’’ keyways. 87 inch. 1265 0. Metric module, side fit. AUTOMATION & IIOT. To use this calculator, input your Torque, Shaft Diameter and Key Length values. Keyway Dimensions Key Dimensions The inch and metric. Shaft couplings shall be so constructed as to present no hazard from bolts, nuts, setscrews, or revolving. it is also important to go with a well-accepted industry bore standard so the. . com The bottom of the key is shaped to fit the curved surface of the shaft. 5 1. 1 to 114. A list of standard keyway and corresponding key sizes for English shafts are listed below in Table 1. As noted in it "This is a condensation of the standards on motors included in NEMA Standards Publication Motors and Generators, MG 1-2006. 025 mm. Pre-keyed shafting is an economic alternative to machining shafts yourself while saving time and labor expense. Cut keys to custom lengths. 4 mm. The extra 4 inches × 3/8″ high key stock. 5020 2. Rectangular or square parallel keys. Clearance Fit Bore Tol. 002+0. 050 mm to −0. 25 6- 30 2 +0. These keys have a tapered body that wedges in to the keyway for a more secure fit than standard machine keys. 000 / +0. 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. 93. Keyway width P9 tight fit (standard design) JS9 or N9 loose fit (standard design) Other tolerances / tolerance ranges must be specified separately and require a written agreement. Total revolutions of shaft = 900x 10 6 revs. †. British Standard :BS 46 Part 1 : 1958 Keys and keyways and taper pins. What is the purpose of a keyway in construction?Securing a belt pulley to a drive shaft often seems like such a routine task, that engineers and mechanics can easily overlook some of the selection and installation factors required. Email: sales@usarollerchain. --keyway dimensions Keyway sizing chartDimensions standard keyseat keyway shaft shafts diameter nominal. Hollow saddle keys. Or clamp the machine to a flat surface, and you can cut motor mount slots. The profile keyway is cut by an end-mill while the sled-runner keyway is cut by an ordinary milling cutter. It may be mildly magnetic. Referencing Figure 1, the keyway dimension is W x T 1. 3mm 2. 6. Drive shaft Design, key and Keyways. width depth tol. 5020 2. 06-20-2011, 11:07 AM. Key and keyway dimensions (control in motion) Keyway shaft coupling hole service couplings modification additional motion control tapered parallel Keyway chart. Metric module, side fit. It might be worth roughing the keyway underwidth by 1/16" and then profile cut both sides with a nice sharp carbide to straighten. Lecture1: Design of Shaft 26. Interference Fit Bore Tol. 1) Unless specified by the customer: 2) Actual shaft fit will vary depending on - Series S couplings supplied with actual shaft diameters. ISO/TC 14. 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. 6. Woodruff Key Assortments. Only informative sections of standards are publicly available. This standard presents inch dimensions, tolerances, and sizes for straight bores, tapered bores, single keys and keyways for unmounted industrial flexible couplings. xls Author: paul Created Date:Full Length Pre-Keyed Shafting. Finished Striaght bores for standard AGMA Class 1 Clearance fit. The hub keyway is dimensioned by its width and depth on the shaft – keyway sides. All Keyways are parallel and to British Standard 46: Part 1: 1958, with the exception of those marked* which are shallower. Schlage Keyway Types. 3) Keyway fillet radius to be specified by customer. 1250 0. A keyway is provided on the shaft and also on the hub or on a pulley to connect together the conjugate parts by inserting the key in between. Key dimensions: Parallel keys are most commonly used. For special purposes, stainless steel shafts usually of steel designation 304 or 316 shall be used. 3125 0. Orthwein [4] suggested a designStandard keyways provide added torque capacity and fixed shaft phasing. DIN 6885/1 :- Definition. 001 TIR, allow for the attachment of gears,. HOUR . 00: 10:. Because they're usually shorter than. BS ISO 4156:2005_1: Straight cylindrical involute splines. ). KEYSHAFT Keyed Shaft, Diameter 3/4 in, Keyway 3/16 in x 3/32 in. 2 Exceptions . International Standard ISO 3117 was developed by Technical Committee ISO/TC 14, Shafts for machinery and accessories, and was circulated to the member. 99. 001 −0 Key. A shaft narrower than the applicable shaft diameter should not be used. Keyway-and-key-size-dimensions. The maximum stress in the standard metric shaft is 25 percent greater. Stocked in: Steel; Stainless Steel; Specifications. The standard industrial solution is one square key, with a set screw directly above the key and one at 90 degrees if using a pulley/gear/sprocket with a solid integral hub. For more information, to get a formal quote on 2-15/16" keyed shaft, or for pricing on any of its accompanying components/ accessories please contact us and we will be happy to assist you. For instance, if standard tolerancing on stainless keys is, say, 0. The following tables show standard dimensions for keys and their. and robotics. Description: : Custom designs with varied tolerances, keyways, non- standard material and bellows are available upon request. Parallel keysKeyway shaft roymech tolerance Shaft standard key sizes rectangular gates keys diameters most non std readily availableParallel metric keys and keyway dimensions. The tolerance zone for shaft keyway width b with normal fit is ISO N9 and with close fit ISO P9. 3mm 5mm 5mm 5mm 5mm 6mm 6mm 6mm 8mm 8mm 22mm 24mm 16mm 17mm 19mm 20mm 25mm Keyway Width (w) 10mm 3mm 3mm 1. Since most inch shaft Tolerancing is controlled by NEMA and/or AGMA, (both standards agree up to 6. 010". Standard keyways for shafts are typically located along the length of the shaft with the centerline of the keyway being parallel to the axis of the shaft. Metric key keyway dimensions per iso/r773. The following tolerances for maximum lead (due to angular displacement of keyseat centerline from centerline of shaft or bore and measured at right angles to the shaft or bore centerline) of keyseats in shaft and bore are specified: 0. Key body. I am designing a part that has two keyways 180 degrees apart on a single large diameter shaft. A rounded bottom allows these keys to rock in their seat to relieve stress on the shaft caused by vibration or misalignment. = 55 MPa for shaft without keyway = 40 MPa for shaft with keyway . All dimensions are in inches. Meaning the keyway in the hub has a rounded contour instead of a rectangular contour. 2 mm, but the shaft had a keyway. 1-1943 standard. - 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. the overhang distance at the nut end so the prop tightens on the taper. The depth of the keyway weakens the shaft. 1 . The table above shows the dimension of the keyway / keyseat for each available hub bore diameter. 46 : Part 1 : 1958 DLMENSIONS OP TANGENTIAL KEYS AND KEYWAYS. Design of Shaft • A shaft is a rotating member usually of circular cross-section (solid or hollow), which transmits power and rotational motion. Material Assignment. 3. 360 Minimum 2. Keyless hubs are often specified for high speed applications to improve the balance of the assembly and to secure the hub to the. 60 mm to 100 mm – 10 mm step. Page Count: 34. Key dimension Keyway dimension Reference b h C l Basic Basic dimension b of b1 and b2 Sliding type Normal type Fastening type r1 and r2 Basic dimension of t1 Basic dimension of t2. 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 6 Table 3 — Rectangular taper keys and keyways, gib-head or plain 9 Table 4 — Square taper keys and keyways, gib-head or plain 10 Table 5 — Woodruff keys and keyways 12 1) Unless specified by the customer: 2) Actual shaft fit will vary depending on - Series S couplings supplied with actual shaft diameters. %PDF-1. 3 N) When I calculate with this data I reach a safety factor of 1,08. 05 0Unlike clearance fit hubs (which must have either a keyway, square bore, or spline to keep them from rotating), interference fit hubs also have the option of not necessarily having a keyway (or keyways) to transmit shaft toque (though many still will).