Keyway tolerance chart. Depending on the slot width tolerance, the following fit or seating results in combination with the parallel key: Tolerance b Hub keyway b Shaft keyway for tight fit P9 P9Type L-Jaw Coupling Rating Chart; Type L-Jaw Cross Reference Chart; Displays. Keyway tolerance chart

 
 Depending on the slot width tolerance, the following fit or seating results in combination with the parallel key: Tolerance b Hub keyway b Shaft keyway for tight fit P9 P9Type L-Jaw Coupling Rating Chart; Type L-Jaw Cross Reference Chart; DisplaysKeyway tolerance chart  Hub "W" Over

Tolerance for Lengths of Chamfer Portions (Corner Roundness and Corner Chamfer Sizes) Unit [mm] Tolerance class. GD&T also allows for manufacturability and inspection of a product. com Web site: (t) - DIM Keyway Bore (inches) Reference Height (d)Keyway standard dimensions keyseat pdf printer friendly information. 001 mm ) d9-20 -45Open ISO 286 Table of Shaft Tolerances Calculator. 5 1 6 2, 6 2 2 2 4 3 3 3. keyways /keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keys. They conform to ANSI B17. 102 0. 2-1978 standards. T-276 (Autosaved) T-276 (Autosaved) Anbarasan Perumal. You can check the tolerance chart below: Table 4 - General Tolerances on Straightness and Flatness Ranges of nominal lengths in mm Tolerance Class H K L up to 10 0. Keyway Js9 Tolerance Chart Pdf Getting the books Keyway Js9 Tolerance Chart Pdf now is not type of challenging means. 2 32-80-0. Shaft Key Seat Depth Control Values S and T for Shaft and Hub ANSI B17. 2768 General tolerances 2768–1 Part 1: Tolerances for linear and angular dimensions without individual tolerance indications 2768–2 Part 2: Geometrical tolerances for features without individual tolerance indications 6410 Technical drawings — Conventional representation of threaded partsused for cutting tools, material stock, gages, etc. , depending on the lock nut size: ANSI/ABMA Std. Note: 2. Machines + Processes. 53 6. 1 0 : 5×5 In October’s column, I mentioned the typical tolerance for key- ways. H8/f7. H11/c11. If a press fit is necessary, never exceed . 4. Minimum Hardness. ISO/TC 14. 3 Coupling Interchange Chart STANDARD COUPLING NOMENCLATURE A complete standard coupling unit consists of: • Two hubs • One insert • One cover QF25 SPHUB X 1 3/8 UWhen selecting a keyway tolerance, there are two common selec-tions in the metric system. Contact. Care should be observed when removing the plugThe chart below lists all standard US Digital encoder sizes and their relative shaft and bore tolerances. 1. Woodruff key is a easily adjustable key, with a hammer blow to the key. The interference fit standard for most couplings made of medium-carbon steel are 0. 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. Keyway Bore Diameter Size Bore Reference -0. Standard and metric keyway broachesTable aii-12. 020 0. The invention belongs to the technical field of measurement of the keyway symmetry degree, and particularly relates to a method for measuring the keyway symmetry degree of a shaft part. 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. 1/16" 3/32". Because this tolerance is looser, fabricators can secure it by hand. 57 to 1. We use keyed shafts in the gear and shaft assemblies in general. New diameter sizes (13, 16, 17, 18 and 22) are added for h9 tolerance types. Bore Size Identification System. 1 Square Keyway Tolerances Minimum 2. The advantage of the Js9 tolerance is that the key can be inserted and the gear manipulated without much difficulty. 1 Class 2 standards for dimensions and tolerances. 0. 5-2009 standard has defined. American system, the keyway in the hub is dimensioned by the width and the depth at the side, but in the metric system the keyway is dimensioned. 3 8 7 31 38 10 3. T Metric trapezoidal thread, 7H: ISO 2903 Axial run-out locating face/thread: 0,06 to 0,16 mm max. We can provide keyed shafts in any length up to 20 foot. Preferred tolerance grade ISO 286; International Tolerance Grades For a solid steel shaft of 18mm diameter, with keyway 6 wide x 32 long by 3. 105 8 Final NIST. Frequently Used Fits. Bore and Keyway dimensions comply with ANSI/AGMA 9002-B04 Standard. 0035) / 2. Get a quote +61 7 3271 5424. • Define the flatness tolerance. Keyway size; b h c or r Standard size of b1 and b2 b1Tolerance (h9) b2 tolerance (E9) r1 and r2 t1 t2; Standard size Tolerance(h8) Standard size Tolerance(h10) Standard size Tolerance Standard size Tolerance; 4×4: 10 or more and 13 or below: 4: 0 -0. Lid Chart. THe 10% Rule: plug gages. The fit designation ranges from clearance fits to interference fits. ) It establishes symbols, rules, definitions, requirements, defaults, and recommended practices for stating and interpreting GD&T and related requirements for use on engineering drawings, models defined in digital data. 1250 0. Unless otherwise specified, the shaft keyway is assumed to be standard. 5 standard is considered the authoritative guideline for the design language of geometric dimensioning and tolerancing (GD&T. • Explain the straightness tolerance. 65) Nominal dimension Tolerance Zones over to U7 S7 R7 P7 P9 N7 N9 M7 K7 J7 JS9 H7 H8 H11 G7 F7 F8 E8 E9 D10 deviations in µm 1 3 -18 -14 -10 -6 -6 -4 -4 -2 0 +4 +12. Select the Woodruff Cutter from the tool menu (Note: Keyseat cutters are referred to as Woodruff cutters for feeds and speeds): 4. We carry a wide range of products with keyways, including bushings and roller chain sprockets. Metric woodruff keys are supplied to din 6888 / iso 3912 in c45k keyKeyway hallite Keyway chartShaft keys. For a key to function, there must be a keyway on the shaft and a keyseat on the rotating machine element. 94 6. 1 Nm. Lovejoy supplies ‘metric’ dimensioned ‘F’ hub straight bores with bore and keyway tolerances conforming to the ISO 286-2 standards for a P7 interference fit unless otherwise specified. A list of standard keyway and corresponding key sizes for English shafts are listed below in Table 1. --keyway dimensionsKeyway chart diagram hallite. Metric External Table Chart Thread Designations Sizes M 1. Tolerance Rating. The second is a P9 tolerance. MPTA B2c -Standard Practice Sheave / Pulley Balancing (MPTA-B2c-2017). 0625 0. 0005-. +35 0. RoyMech Resources Keyways Woodruff Metric key and Keyway Dimensions These Pages include various standards. Coupling Sizes 1020T thru 1090T are generally furnished for CLEARANCE FIT with setscrew over the keyway. 5 t S m Part Number L 0. Width. 062 0. Metric module, side fit. 2 (1978) and ANSI B4. Descriptions of the Thread Series:. DIN 174. or even a keyway. Only informative sections of standards are publicly available. --keyway dimensionsStandard keyway dimensions Keyway metric key dimensions standard keyways keys bores shaft hub depth iso diameter engineering table edge width. 8 6 6 23 30 8 3. 587 / 2. Surface Roughness Conversion Chart Tables- Engineers Edge. Keyway chart sizing key shaft engineeringShaft diameter solid keyway uniform shown re text below factor gears safety transcribed show Metric key keyway shaft standard keyways falk keys bores resources. Fits and tolerance calculator for shaft and hole tolerance calculation according to ISO 286-1 and ANSI B4. Its theoreticai value is equai to JZGX 3) The width b, is a function of the miiied depth t,. 3/8 . Adriaan. BS 4235-2:1977, ISO 3912-1977: Specification for metric keys and keyways - Woodruff keys and keyways. 1) This Standard defines preferred tolerances for limits and fits for nonthreaded cylindrical features and defines specific sizes, fits, tolerances, and allowances for use where they are applicable. 1250 0. 1. 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 CSAB232 Keys and Key seats 0. ASME Y14. js9 width. H is the key height. 8 4 4 13 17 5 2. BS 5686:1986, ISO 14-1982: Specification for straight-sided splines for cylindrical shafts: metric nominal dimensions, tolerances and gauging requirements. Keyway sizing chartMetric keyway tolerance chart Shaft standard key sizes table non bushing bore keys qd shallow range gates includes specific each alsoWoodruff keys ansi keyway nominal fasteners. 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 Dimensions The inch and metric dimensions here correspond to common values. 00075 in/in (mm/mm) interference up to 1800 rpm and 0. Created Date: 6/24/2022 11:29:26 AM. Nominal Bore Diameter. The key and key seat cross section are ISO standardized. 00 tolerance 2. shaft tolerance table (iso) ≥ < b10 c9 d8 e7 e8 f7 g7 h6 h7 h8 js7 k7 m7 n7 p7 r7 s7 t7 - 3 +180 nema quick reference chart nema frame de2f h nop uvaa ab ah aj ak ba bb bd xo tap 42 2-5/8 1-3/4 1-11/16 9/32 1-1/2 54-11/163/8 1-1/8 3/84-1/32 1-5/16 3-3/4 3 2-1/16 1/84-5/8 1-9/16 1/4-20 slot 48 3 2-1/8 2-3/4 11/32 1-7/8 5-7/8 5-11/161/2 1-1/2 1/2 4-3/8 1-11/16 3-3/4 32-1/2 1/85-5/8 2-1/4 1/4-20 slot Coupling Interchange Chart Gear Couplings QF25x2-1/2 (hub size followed by bore size). There many standards that cover the topics of metric bore tolerances, fits and keyway sizes. 025 = 39. The True Position is the exact coordinate, or location defined by basic dimensions or other means that represents the nominal value. To confirm the status of any standard, identify the replacement standard if it is obsolete and/or purchase the standard please use. Machine keyway to recommended size and tolerance listed per Table 4 on Page 3. Lid Chart. We additionally allow variant types and in addition. 625″ OD, For Split Taper Sprockets & Sheaves. This is an undersized clearance. It also gives the relation to be observed between the diameter of the shaft and the section of the key. 3 h2 = h, f = h, e ≒ b S1 = b's tolerance×1 2 S2 = h's tolerance×1 2 6. Detailed width tolerance information is best drawn from the manufacturer. However. 0005" tolerance and a not parallel to bore tolerance which creates a feeling of tighter fit. Types of Keyways: Keyseating broaches are used for producing keyway-shaped holes in a workpiece. GD&T is an important tool that helps engineers communicate the tolerances of a design. 2 Woodruff Key Size Table Chart ANSI B17. The advantage of the Js9 tolerance is that the key can be inserted and the. 30302 is a webpage that provides comprehensive guidance on how to select, install and maintain rolling bearings for various applications. Shafts outside the listed range may present trouble with installation. Metric keyway tolerances conform to ANSI/AGMA 9112 Normal keyway width tolerance. Description. Standard and metric keyway broachesKeyway sizing chart Standard keyway dimensionsKeyway sizing chart. Hole-Drilling , Tolerances , Fitting. 93. a spline for a 50mm OD spline with say a module of 2mm would have a PCD (D) of 50 - 2 = 48mm. 314 . 5 m (500 mm) Lengths (19. No external keyStandard Keyway Dimensions Shaft Diameter Set Screw Width Depth Up through 7/16" 8-32 3/32 3/64. Related Resources: gears Shaft Diameter vs Key Sizes Design Recommendations. i always thought internal keyway should be within . WooHoo! You subscribed successfully. 0000 /-. CLOSE RUNNING: For accurate location and moderate speeds. Nominal Shaft Diam. Keyway width P9 tight fit (standard design) JS9 or N9 loose fit (requires written agreement) see also. You could not on your own going once ebook buildup or library or borrowing from your friends to get into them. You can read about them here. May 13th, 2019 - Square Keyway Tolerances 3 8 3750 7 16 4375 Page 1 of 6 PFEIFER INDUSTRIES LLC 2180 Corporate Lane Suite 104 Naperville IL 60563 USA Maximum 1 6885 0 3770 1 869. keyways available upon request. 442 2-5/16 2. The standard ISO 286 defines the system of tolerances, deviations and fits only for basic sizes up to 3150 mm. 5 +10 +14 +60 +12 +16 +20 +28 +39 +60 Keyway dimensionsKeyway sizing chart Metric stepper motor shafts size data tableMetric key keyway dimensions per iso/rtt3 js9 width. Straight Sided Spline Dimensions. Key & Keyway Dimensions Millimeters Shaft Diameter. Keyway metric key iso dimensions standard keyways keys r773 pdf bores shaft hub. The dimension from the top of the keyway to the opposite bore side, “T-dim”, is calculated from (refer to ANSI/AGMA 9002-B04) the following: T = bore + (h kw - Ch) Shape and dimensions of parallel key and keyway Shape and dimensions of taper key, headed taper key and keyway Excerpt from JIS B 1301:1996 S1 = b's tolerance× 1 2 S2 = h's tolerance× 1 2 h2 = h, f = h, e ≒ b S1 = b's tolerance× 1 2 S2 = h's tolerance× 1 2 Key body Cross section of keyway Key body The second is a P9 tolerance. The common Contact. They are useful for shaft end. Technical drawings often include notations such as “50 g6” or “17. Stay up-to-date with new products releases, news and promotions. 120. Rockwell B85. Table 1 details the appropriate key slot and key sizes for various. keyway js9 tolerance chart secure4 khronos web may 21 2023 the same and is only listed. Metric key keyway dimensions per iso/r773. 9 20 12 76 86. 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 Keyway Bore Diameter Size Bore Reference -0. 3 DIMENSIONS AND TOLERANCES OF KEYS AND KEYWAYS See the figure and the table on pages 2 and 3. KeyWay /Key Dimensions. i always thought internal keyway should be within . 000" Newsletter. The ANSI B4. dIt is used in non-mating assemblies like bearing bushes fitted into the bearing housing, key fitted into the keyway, etc. General Tolerances (Excerpt from JIS B 0405 1991/JIS B 0419 1991). 25 - M 1. 0. 1265 0. 010 0. FAQ. Posted on February 1, 2023 in Industry Formulas. ISO/R 773:1969. Loose running fit for wide commercial tolerances or allowances on. Aspen Fasteners offers the following sizes for immediate delivery from stock: Diameters ranging from M5 to M14 and up to 90mm long and available in 316Ti stainless steel. 1. Metric External Table Chart Thread Designations Sizes M 1. MSC#36883692 Mfr# H 24 MM. Standard size classification. The maximum bore size should be 60% to 70% of the hub diameter (or teeth root diameter), and 50% to 60% for keyway applied modifications. Key Size. When a specialized cutter is used to cut the Keyseat, it’s a. S. 30. Recommended Hub Keyway Dimensions (mm) Reference AGMA 9112-A04 Standard metric keyway width tolerance per Js9 Imperial Standard Bore and Keyway Info Recommended Bore Tolerance for Imperial Shafts (Inches) Nominal Shaft Range Shaft Tol. 039 mm. 53 2. W is the key width. Blog GD&T Quiz Print Reading Quiz Guide to Team GD&T Training Orthographic Projection Chart Drill Tap Chart ASME Y14. 7500 3. 0015 0. ‡ For any bore fit per table below. Keyway Size Chart - Farrell BearingsBS 4235-2:1977, ISO 3912-1977: Specification for metric keys and keyways - Woodruff keys and keyways. 2Keyway chart. This cylinder has two 3/32” diameter ball bearings on each side of the keyway. 2; Thread Shear Area for External and Internal Formulas and Calculator per. 18. 010/-/000 for all standard keyways. 3 S2 6. Keys and keyways BS 46 Part 1 : 1958 Keys and keyway Dimensions-Parallel Rectangular Adve Radius 0. Get a quote +61 7 3271 5424. ISO Tolerance Zone According To According To According To According To According To According To; h9 h9 h11 min max DIN 6881 DIN 6883 DIN 6884 DIN 6885 DIN 6886 DIN 6887 DIN 6889 (8 x 7)We also have an Metric Keyway Calculator. Keyway chart shaft sizing engineeringKeyway sizing chart Agma keyway bores engineers edge asa data fit llc copyright 2000 2021Keyway dimensions table aii. The 10% Rule is intended to assist in the selection of the tolerance for Go & No-Go gages. Rectangular sunk key. Unless otherwise specified, the shaft keyway is assumed to be standard. Durometer 85D. The second is a P9 tolerance. D. anit. M 1. 4235 : PART 1 : 1972. The hub keyway is dimensioned by its width and depth on the shaft – keyway sides. Unsubscribe. 3- Special case for M6 from 250mm to 315mm tolerance. Straight-sided splines for cylindrical shafts with internal centering — Dimensions, tolerances and verification. View available parts by clicking on the following link: DIN 6885 Parallel Keys High Type “A”Machine Key Comprehensive Guide. Just enter the size of the key and shaft, then click "Calculate". 3 +0. P9 and D10 width tolerance can be furnished on request. Subscribe. Keyways will be furnished per ISO/R773 and Js9 width tolerance unless otherwise specified. Metric bore tolerances conform to ISO 286-2 H7 for clearance fit and P7 for interference fit. CLOSE RUNNING: For accurate location and moderate speeds. 1. 10. It is a precise language that allows for consistent interpretation of a drawing. 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. 1 1. com ©2004-2021 Kramer Power Equipment Co. Non standard bores and over the keyways. 332 Maximum 3. Merely said, the Keyway Js9 Tolerance Chart Pdf is universally compatible with any devices to read. 010" Keyway Dimensions to BS 46 Part 1-1958 In the absence of specific details. Keyways will be furnished per ISO/R773 and Js9 width tolerance unless otherwise specified. 975. We stock pre keyed shafting in many diameters, including metric diameters, with standard keyways. 3/32" 1/8" 3/16" 1/4" 5/16" 3/8" 1/2" For Shaft Keyway Height. 6 - M 18. Chart shown later in this document gives the number of threads/inch based upon threads series and nominal diameter. KeyWay /Key Dimensions. 13. Check Details. General tolerance of straightness Unit:mm Over 2000 to 4000 incl. 5~ X. H7/h6. The combination of angular and parallel misalignment within a system may be more detrimental to the coupling and equipment thanNotes: Inch bore and keyway tolerances conform to ANSI/AGMA 9002. Key dimensions: Parallel keys are most commonly used. Keyway Depth. 1. 004″ with the below true position callout of 0. 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. Read more on how keys and keyways work and what types are available – Keys and Keyways. This Calculator will determine the preferred size and limit tolerances for Running or sliding to interference-locational fits per ANSI B 4. Statistical Tolerance. 252-0. 8") 3 m lengths available. 8mm 2. 10. required Minimum Coupling rating:Iso Keyway Tolerances P9 Pdf Eventually, you will unconditionally discover a other experience and attainment by spending more cash. H9/e9. In particular, tolerances are assigned to mating parts in an assembly. Keys and keyways. $17. 376 . 6. Symbol. But also, there are lots of kinds of other applications. 5mm Keyway Depth, Type H Sprocket Bushing. For Hub Keyway Height. 1mm. 50 3. The first is Js9. 093 / . Use them in light duty applications to connect gears and other components to shafts. 99. As with all functions of the Machinist's Calculator, linear values can be. 5000 2. 3/32" 1/8" 3/16" 1/4" 5/16" 3/8" 1/2" For Shaft Keyway Height. Pivots, latches, fits of parts exposed to corrosive effects, contamination with dust and thermal or mechanical deformations H9/C9, H9/d10,H9/d9, H8/d9, H8/d8,D10/h9, D9/h9, D9/h8 Running fits with greater clearances without any special requirements for accuracy of guiding shafts. 2515 0. BS 5686:1986, ISO 14-1982: Specification for straight-sided splines for cylindrical shafts: metric nominal dimensions, tolerances and gauging requirements. A Keyway is a slot of some kind that is used to align the part on a shaft and prevent the part slipping as the shaft rotates. The tolerances defined in ISO 286-1 are applicable to size range from 0 mm to 3150 mm but there are exceptional cases defined in the. Comments are off. Tolerances: KM/KML Metric thread, 5H: ISO 965-3 Axial run-out locating face/thread: 0,02 to 0,06 mm max. 015. ISO Tolerance Calculator (Explained) Our tool is a fit/tolerance calculator that is addressed to students, employees, and apprentices (trainees) in all technical sectors. 3mm 5mm 5mm 5mm 5mm 6mm 6mm 6mm 8mm 8mm 22mm 24mm 16mm 17mm 19mm 20mm 25mm Keyway Width (w) 10mm 3mm 3mm 1. 3 10 8 39 44 12 3. - Series F couplings supplied with 4) All dimensions per AGMA 9002-A86 interference fit bores without set screws commercial standards. 062 0. 0. 250 +0. 003-0. General tolerances for parts formed by shear from metal plates Table 1. 1This all-new CR Seals handbook from SF com-bines or best ideas and insihs from he ast and he resen We hoe i beomes yor first and las sorce for informaion on radial shaft sealsBritish ISO Metric Screw Threads Designations. Thru Width "W" Height "H" Nominal Min. 001) of an inch. The following tables show standard dimensions for keys and their grooves. All dimensions are in millimeters. The slot is defined as a keyway or a. DIN 6880. Choose from our selection of rectangle keys, including over 950 products in a wide range of styles and sizes. Unless otherwise specified, the shaft keyway is assumed to be standard. When selecting a keyway tolerance, there are two common selections in the metric system. 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. Keyway (Hub) Radius r. 5020 2. 1Woodruff Keys. 000 with a keyway of 1 . Slab inserts and keyways should be stored horizontally on wooden. Here, you can find detailed information about these machine elements. 2; ANSI Shaft and Hub Keyseat Dimensions for Woodruff Keys per. 950. ISO/R 773:1969. However, determining the final limits can be time-consuming and involve navigating complex charts. imperial keyways diameter key size (nominal) shaft hub width depth width depth over incl w h max min max min max min max min 25. The following Engineering calculator will show the plus and minus tolerance for the specific ISO 286 Shaft tolerance data. Pivots, latches, fits of parts exposed to corrosive effects, contamination with dust and thermal or mechanical deformations H9/C9, H9/d10,H9/d9, H8/d9, H8/d8,D10/h9, D9/h9, D9/h8 Running fits with greater clearances without any special requirements for accuracy of guiding shafts. Created Date:tolerances, poor installation practices, thermal growth or shrinkage, foundation movement, and/or component wear. The hole basis fits have four preferred hole tolerances (H11, H9, H8, and H7); the shaft basis fits have four preferred shaft tolerances (h11, h9, h7, and h6) as shown in Table 6-1. A small tolerance key and keyway helps to reduce stress concentration and increase safety. For more exact dimensional data, please check the specific drawing for each catalog number. Also see Table of Hole Tolerances per. 093 / . Standard. S1=Tolerance of b× 2 Slope Key (Code T) 1 S2=Tolerance of h× 2 Section of Key Gib Head Key Section of Key(A-A) h2=h, f=h, e≈b Section of Key Groove h2=h,2 f≈h, e=b 1 S =Tolerance of h× 2 1 S1=Tolerance of b× 2 [Technical Data] Machine Keys and Key Grooves Excerpts from JIS B 1301(1996) 2. 006" # Tolerance each on T1 and T2 (16"-20") is-. 0 2 2 9 10 3 1. ISO 286 1 2010 Geometrical. Undersized. 8 14 9 51 58 16 4. The upper limit for the shaft = 40. ex: H11. Keyway (Hub) Radius r. 0 +0. . 3mm 2. 020 0. This standard is intended to provide dimensions and tolerances, which will permit bushings made by one manufacturer to be used to mount sheaves or other products made by a different manufacturer. Example 2. The tolerance zone for shaft keyway width b with normal fit is ISO N9 and with close fit ISO P9. To use this calculator, input your Torque, Shaft Diameter and Key Length values. 8mm 1. Non standard bores and over the keyways. ISO/R 774:1969. Metric keyway tolerances conform to ANSI/AGMA 9112 Normal keyway width tolerance. Hole dimensional tolerances for regularly used ˜tting Units: µ m Standard dimension More than Not more than - - - - - - - - - - - - - - - ± 31 ± 26. Oversized. 4 Metric External Table Chart Thread Designations Sizes. Keyway lengths should be less than 1. 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. Keyway (Shaft. 6 - M 18.