Standard keyway chart. Standard Keyway (PDF – 82. Standard keyway chart

 
Standard Keyway (PDF – 82Standard keyway chart  Therefore, keyways are required both on the shaft as well as the hub of the mating element

196 Vulcan Street Buffalo, NY 14207. We can provide keyed shafts in any length up to 20 foot. Metric module, side fit. 010 Height (d) (t) - DIM Keyway Width (w) AGMA 9002-A86 Inch Bore and ANSI B17. Arrow’s unique manufacturing process gives Arrow Pointe interchangeable cores unmatched strength and durability. Designation system. pdf - Free download as PDF File (. 3 16 10. 25 0. Standard Keyway Shallow SF-STL 11,000 0 . They are also often used on tapered shafts. Kwikset’s SC1 Keyway works with all standard SmartKey door locks and allows up to 100,000 key combinations. 487 Minimum 2. Keyways DATA SHEET DS103 REV. Keyway depth and fillet radius per BS. 313 2 . Security cylinder optional; see Quick Codes. If you are looking for a comprehensive guide to Schlage key systems, cylinders and keys, you can download the catalog from this link. Cylinders: Solid brass cylinder and plug. Welcome Location Transmission Bushes Pulleys Belts Vector Belts Roller Chain & Sprockets. Keyway Sizes Broach Style Bushing Diameters (bore sizes) 16, 3 32, 18 A /4, 5 16, 3 8, 7 16, 2 EDP No. Nominal Dia. Keys are made of steel. Shaft keyed keyway aluminum diameter grainger length motor shafts close Keyshaft keyed shaft, diameter 3/4 in, keyway 3/16 in x 3/32 in Coupling answers. Drive shaft Design, key and Keyways. 35 7. 3. 3/32" 1/8" 3/16" 1/4" 5/16" 3/8" 1/2" For Shaft Keyway Height. 4mm 8mm 2mm 9mm 12mm 11mm 4mm 4mm 14mm 15mm DIN 7154, H7 Metric. 350 Maximum 2. Max. Inactive Keyways Many older Corbin Russwin keyways are designated inactive. 020 0. Total Height (X) = Depth (Y) = Return to broaching : 2388 State Route 726 Eaton, Ohio 45320 (937) 456-2232 Fax (937) 456-2282 [email protected] Access AD433-2 Key Combinator. This International Standard specifies the dimensional characteristics of thin parallel keys and of the corresponding keyways in shaft and. H/2. have shallow keyseats. pdf), Text File (. NOMINAL SHAFT DIAMETER BOTTOM OF SHAFT TO BOTTOM OF KEYWAY WIDTH. Save Save Keyway Sizing Chart For Later. Keyway Dimensions Chart. Series 500 and 600 Standard Keyway Broach ChartDownload a Printable Keyway Chart. Square keys. The following tables show standard dimensions for keys and their grooves. Metric Keyways Index page; BS 46 Square Keys and keyway Dimensions; BS 46 Square Keys and keyway Dimensions Ref. Parallel Key and Taper Keys Dimensions. Rework Charges for : Rebores, Keyways, additional setscrews - P. 65 3. Keyway width tolerances per BS 4235 P9 fit. 19. Furnished with two nickel silver keys standard. 99. The collar rests on top of the workpiece rather than being supported from below. Shaft Keyseats/Hub Keyways Standard Keyseats/Keyways. Schlage Primus. We would like to show you a description here but the site won’t allow us. 0284, email us, or fill out and submit our online request for quote form. 824. Figure A–15–8SMALL FORMAT INTERCHANGEABLE CORE KEYWAYS. The first is Js9. Install them in keyways to transmit torque from shafts to gears and other components. This is measured at. sometimes referred to as a keyway. * The slot width is typically P9, exceptions are indicated on the respective standard sheet. All keyed Shafting is guaranteed to fit on a bearing, and the ends can be. To use this calculator, input your Torque, Shaft Diameter and Key Length values. Check Details. Specify keyway: A (standard) or other keyway Standard cylinders - 6-pin Catalog number Description Q330-396 Falcon cylinder, G keyway, 6 pin Q330-397 Falcon cylinder, G keyway, 6 pin to 5 pin Q630-310 Falcon cylinder, G keyway, 6 pin, K571 Q630-311 Falcon cylinder, G keyway, 6 pin to 5 pin, K571 Q330-391 Schlage cylinder, C keyway, 6 pinEagle Tool Metric Keyway Chart. 7500 3. Shaft Key Seat Depth Control Values S and T for Shaft and Hub ANSI B17. steel. Strict Tolerances. Are there any standards for Metric bores and / or keyways? There many standards that cover the topics of metric bore tolerances, fits and keyway sizes. (Square) Max. For example, an ANSI 202 measures 1/16 x 1/4, while ANSI 1012 measures 5/16 x 1 1/2. ANSI B17. Keyway (Shaft. S. Available in standard 6 and 7 pin format in Arrow and competitive keyways, dealers can install Arrow Pointe in new or existing key systems. Keyway shaft coupling hole service couplings modification additional motion control tapered parallelGates belts, hoses, and applications: standard & non-standard shaft key Shaft and hub keyway. 2. Keyway (Hub) Radius r. Keyseats and Keyways. 3) Keyway fillet radius to be specified by customer. To (Incl. AUR8807FL x RH x 2196 x 626 or AU5407LN x RH x 1210 x 626. 1/16" 3/32" 1/8". R R Cutter Run-out. keys and keyways now have consistent dimensions and tolerances for each size as far as possible, and this will enable a standard range of cutters to be used for the machining of the various types of keyways. Right now, I've got the Ilco/JMA stuff copied from their catalogs and W3. This catalog covers the features, benefits, dimensions, selection, and installation of various jaw type couplings, including the industry-standard L type. : What cylinder and cam is used with the 650 series keyswitch? Resolution: If blocking rings (PN 36-079) are needed, specify dimensions when ordering. Not the drawing, just four dimensions. Install them in keyways to transmit torque from shafts to gears and other components. The keyway is a longitudinal slot in both the shaft and mating part. 5000 2. British Standard :BS 46 Part 1 : 1958 Keys and keyways and taper pins. Thin parallel tkeys and their corresponding keyways (Dimensions in millimetres) Clavetage par clavettes paralldes minces (Dimensions en millim&res) First edition - 1974-08-15 UDC 621. You can think of them as being Internal (Holes) or External (Shaft) features. Rexnord Industries, LLC, Coupling Group 497-108 5555 S. AGMA ASA Keyway and Bore Design Data ASA Keyway and Bores Design Data including dimension; Woodruff Keys ANSI B17. Keying Features Available Master keying Construction master keying Security Visual key controlEnglish Standard Keyway and Key Sizes. Arrow Pointe interchangeable core products offer dealers unlimited flexibility and keying options. 010 Height (d) (t) - DIM Keyway Width (w) AGMA 9002-A86 Inch Bore and ANSI B17. Get In Touch. 2-1967 (R1998) - Engineers Edge. WIDTH. Optional strikes and wrought boxes available; see Strikes, this page. For more information, contact our sales department at 906. 3125 0. 002 - . We would like to show you a description here but the site won’t allow us. 19-1997 . Inch (ANSI/AGMA 9002-B4) Metric (ISO/R773) Design of Square Key and Keyway (Wood Ruff) Stress, Shear and Torque. LOCK. keyways & keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keysRecommended ANSI Standard Keys and Keyseats Design per. ANSI Woodruff Keys. Style C - Sprocket with hub extension both sides . 250 0 . 25 - M 1. Table of tooth dimensions circular pitch. Also, T 1 and T 2. I typically use +0. 10 Standard Set Our best selling Broach Set. British Standard Keyway Tolerances treadmi com. The key length should be less than 1. These keys have a rounded shape that makes them easy to remove when parts need to be taken apart frequently. ) Millimeter Bore Inch Bore Bushing Stock Bore Range Maximum Standard Shallow Minimum Keyway Keyway #Important — The metric system does not refer to keyseat or keyway dimensions as does the English. Schlage keyway types including Primus/Primus XP, Everest, Obverse, Reverse, Numbered or Paracentric, and Quad. Open keyways Standard keyways available without any ordering formalities. These explain the sizes and dimensions required by different keyway families according to different manufacturers, and the charts are used in the making of keyways to ensure correct sizing. Metric External Table Chart Thread Designations Sizes M 1. Keyway standard dimensions keyseat pdf printer friendly information. Shaft and Arbor Class A and B . keyway chart circular m12 and ½”-20 cordsets and receptacles are available in a variety of pin configurations and wire color codes. 3/64. SPECIFICATION FOR PARALLEL KEYS AND KEYWAYS. 774. Coping with foreign bore and keyway standards | Machine Design. 1 Square Keyway Tolerances Minimum 2. 8 38. Schlage “C” keyway also available on. 3 h 2 1 t t h d c c h b 6. 125 2 . Ansi Standard Keyway Sizes Pdf is available in our digital library an online access to it is set as public so you can get it instantly. Measure the keyway width and height. − S2 − S1 b 25 25 ℓ 1. pfeifer. Australian Standard Technical drawing Part 201: Mechanical engineering drawing SECTION 1 SCOPE AND GENERAL 1. 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. pdf), Text File (. Currently it appears that L4/a1011 is the standard keyway offered on NEW russwin hardware today. Keyway Sizes Broach Style Bushing Diameters (bore sizes) 1 /8, 3 16 B 1. 1” and Less +. Obverse family includes the Schlage C keyway, one of the most commonly used, open keyways in North. 8mm 2. 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 -InchesDimensions imperial key keyway rectangular parallel keys 1958. Lid Chart. Reversible in the field. British standard keyways. keyway chart hallite web keyway chart the following tables show standard dimensions for keys and their grooves metric rectangular b s 4235 part 1 1972dard and must be ordered. Interchangeable core (IC) cylindersBS 4235-2:1977, ISO 3912-1977: Specification for metric keys and keyways - Woodruff keys and keyways. 5/16 to 7/16. Posted on February 1, 2023 in Industry Formulas. • Furnished standard with No . keyways (see page 18). The key should fit snuggly in the keyway with minimal side Standard keys should be the same length or slightly longer than the keyway in the hub. Keyway size chart pdf. Notes: n Tolerances for bore and keyways are found in Engineering Data section (pages ED-10 and ED-11). Get a quote +61 7 3271 5424. 025: 2: 0 -0. A keyed joint is used to ensure orientation or restrict rotational movement between parts, as in the case of joining a shaft with a coupling. 4 Metric External Table Chart Thread Designations Sizes M 1. Standard QD Bushings Dimensions (Inches) Bushing Bolt Circle Keystock provided for nonstandard keyways. Transeals - Keyway Chart. We would like to show you a description here but the site won’t allow us. Use them to connect gears and other components with tapered keyways to shafts. The keyway types have been separated into three functional groups. /ea. Specify either without one (none), with one per our standard keyway chart (std) or as custom. Results from the CBS Content Network. 0. Title: si-fcbw-cw-rotation-inside-hub-. BS 46 Part 1 : 1958 Square Keys and keyway Dimensions. Also, T1 and T2 are not Figure 2 Keyway Sizes. 97 rosette and compression ring • Optional Collars/Spacers available . 6 6. This is a +/- band clearance; the value of the. The general working principle of the sunk types is, that there are two portions of the keys that lies at the hub and the. 100 standard ; Available in plate, single hub and double hub configurations ; Made from high-grade steel and carbon steel ; Optional taper bushes simplify installation and removal ; Special products made from grey cast iron HT250 or cast iron 250 ; Surface treatment, including black oxide, available. Leader in Energy Efficient Industrial Electric Motors and Drives NEMAKeyseat NEMAKeyseat Shaft DimensionsShaft Dimensions (U)(R) (S)(U) (R)(S) 3/8 21/64 FLAT 1-7/8 1-19/32 1/2 1/2 29/64 FLAT 2-1/8 1. 1875 0. Shaft Size. (10 is added to the Control Key cuts to compensate for the thickness of the control lug, which is ten “increments” thick)wrench torque values given in the chart below. Key & Keyway Dimensions Millimeters Shaft Diameter. Sunday: closed. Preferred Keys. Metric External Table Chart Thread Designations Sizes M 1. 459 Maximum 3. It covers the features, benefits, specifications and ordering information of various Schlage products, such as Everest, Primus, Classic and SFIC. We carry a wide range of products with keyways, including bushings and roller chain sprockets. 94 6. 7/28/2019 Transeals Keyway Chart. Measure the overhang distance at the nut end (draw) with the propeller tightened on the taper properly. The stress concentrations at the keyway end are most severe for the profile keyway, so with respect to fatigue the sled-runner is the best design. Metric keyways are dimensioned by width and depth as measured from the radius of the. KEYWAY AND SHAFT DIMENSIONS B-8584 1 1 B C A B. Style B - Sprocket with hub extension one side . 8mm 2. All of the measurements listed on the product pages in inches without the keyway width or depth. 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” 3. --Satyanarayan Gangaram Pitroda Addeddate 2013-09-10 07:34:16This chart shows the most common uses/applications. It seems that everyone is familiar with the Schlage key shape. 4. Keyway Machining. 4mm 1mm 1. Key Control Open Keyways Standard keyways available without any ordering formalities. COMPONENTS PowerDrive LLC Bore Tolerance 0 to 2 2 to 3 3 to 4 Over 4 +. The end of a keyway has two standard designs, shown in Fig. Chart 1 (below) is a cross reference of the SARGENT L Section six pin key blanks starting with the nine Day Keys, then the Lower Level, Mid-Level, and the Top Level Master Keys. 8 14 9. ANSI B17. 625 1 . †. 2500 0. Style A - Flat sprocket with no hub extension either side . Keyway Bore (inches) Reference Height (d) 1. clearance fit bores with set screws. 2) Dimension h of the taper key names the largest height of the key, and dimension t z largest depth of the hub keyway. Metric woodruff keys are supplied to din 6888 / iso 3912 in c45k keyKeyway hallite Keyway chartShaft keys. scope: 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. Nominal Bore Diameter Clearance Bore Interference Bore Keyway “T”-DIM +0. Straight-sided splines for cylindrical shafts with internal centering — Dimensions, tolerances and verification. 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 bodyvertical center line of the keyway. txt) or read online for free. Keyway designation Key bow Chain hole Key cuts Keyway milling Serialization code Key blade Key stop tip Series keymark code 3 8 L l. S. Reliable. We would like to show you a description here but the site won’t allow us. 3mm 5mm 5mm 5mm 5mm 6mm 6mm 6mm 8mm 8mm 22mm 24mm 16mm 17mm 19mm 20mm 25mm Keyway Width (w) 10mm 3mm 3mm 1. Keyway Sizes Broach Style Bushing Diameters (bore sizes) 16, 3 32, 18 A /4, 5 16, 3 8, 7 16, 2 EDP No. 0625 0. 2 Krysinch — A close plus toleranced, cold finished steel stock for parallel keys. 5. A letter of authorization from the end user is required to process orders for Restriced keys, blanks, and cylinders. 062 0. 5000 2. Standard External Metric Thread and Fastener Sizes M 0. A A B B; Max. Cross-section of a parallel keyed joint. Keyway Chart. Face Width Face width is limited in its maximum dimension to allow proper. 5,. This standard does not apply to: - couplings attached to shafts without keys, see ANSI/AGMA 9103-B08;American Metric ® Corporation Ametric ® 672 GROUP: 064 1 1. Keyway chart sizing key machine engineering keyways shaftKey and keyway dimensions (control in motion) Keys & keyways specificationKeyways keys dimensions metric parallel tolerances engineering bs fit figure source 1972. This is a +/- band clearance; the value of the tolerance is equally oversized or undersized. The term “sunk key” refers to a key that fits into keyways both in the shaft and in the secured member of the machinery. 3mm 2. keyways & keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keys Recommended ANSI Standard Keys and Keyseats Design per. Available in standard 6 and 7 pin format in Arrow and competitive keyways, dealers can install Arrow Pointe in new or existing key systems. 298. 5. Chart shows how XC key is fully compatible with non-XC cylinders Master Sections Key Blank Key Sections Plug Key Sections SARGENT Key Blanks Master Key Section (6 Pin) Day or Change Key (6 Pin) Catalog Number 11-X6270 Catalog Number. Metric Key & Keyway Dimensions Per ISO/R773 – D10 Width Tolerance ‡. Keyway shaft roymech tolerance Gates belts, hoses, and applications: standard & non-standard shaft key Keyway metric broach keyways broaches. Competitive keyways: AB, BB, CB, DB, EB, FB, GB, HB, JB, KB, LB, MB, QB Arrow SFIC Lock Cylinders 6025 Cinderlane Parkway • Orlando FL 32810 • 407. S20, S24, S32, T9, T12 TAP. A keyway name may be shared between the two key fami. To view the full content, you will. 3mm 3. 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. Click here to purchase the full version from the ANSI store. Keyway Chart. 25 - M 1. The prole keyway is cut by an end-mile while the sled-runner keyway is cut by an ordinary milling cutter. 6 6. . pdf 2023 gestudy byu edu web web keyway chart the following tables show standard dimensions for keys and their grooves metric shaft and. keyway chart circular m12 and ½”-20 cordsets and receptacles are available in a variety of pin configurations and wire color codes. Keyway metric key iso dimensions standard keyways keys. Keyways: Falcon “G” keyway standard on standard cylinder. GMS meets the precise tolerances required for SFIC Cores. Square. When keyway and setscrew sizes are not specified, they are supplied in accordance with the table of dimensions headed “STANDARD KEYWAYS AND SET-SCREWS. Keyway Depth. Properly jointed pavement Spacing of the initial cracks varies from about 40 to 150 ft (12. 657. 55 9. 4235 : PART 1 : 1972 Imperial – Rectangular B. pdfStandard bore and keyway tolerances (inch and mm) keyway. Keyway Dimensions for Bores. Inactive Keyways Many older Corbin Russwin keyways areThe key has a series of grooves (also called millings) on its sides, and as it slides inside the plug (Center of the cylinder), the horizontal grooves align with grooves (also called broachings) in the keyway, which then denies or allows access to the cylinder. Standards for standard inch units are:The bottom surface is straight and the top surface is tapered. British Standard :BS 46 Part 1 : 1958 Keys and keyways and taper pins. 18. Handing: Right hand is standard; left hand optional. Keyway key parallel jis sizes tolerances 1301 mm 1996 pulley excerpt unit techKeyway metric Table aii-12. According to the changing application, there are different kinds of shaft key and keyway applications. Non standard bores and over the keyways. on each of the shafts over the keysBy accepting cookies you agree to let us store cookies to personalise content and ads, provide social media features and analyze site usage. This will, by necessity, be out of. 2. Handing: Right hand is standard; left hand optional. Key Seat Key Keyway Key Standard Keyway and Key Dimension Bores Keyway Key SF-STL 9/ 16 3. The height of inch keys decreases by 1/8" for every 12" of length. Competitor cylinder: The W Series accepts standard 6-pin cylinders available from Falcon, as well as Keyways: “G” keyway standard on Falcon standard cylinders. Each Sheet has data printed both sides with laminated protection 8. ANSI B17. 062 0. Regular core (suffix keyway to number) Uncombinated Combinated 6-pin 7-pin 6-pin 7-pin Standard C646 C647 C606 C607 Best® style capping CB846 CB847 CB806 CB807 No logo C648 C649 C608 C609 No logo, Best® capping CB848 CB849 CB808 CB809 Note: Specify core number, keyway. 010-. 9. This key stock is undersized, so keys will fit slightly more loosely than standard keys and are best for inconsistent keyways. keyways /keys dimension in accordance with BS 4235-1:1972: Specification for metric keys and keyways - Parallel and taper keys. 19-1997. MC 118 SC 10B ST KA2 CAM STYLE AR = Adams Rite CL = Cloverleaf SA = Sargent SL = Schlage ST = Standard Yale KEYING KA2 = Keyed. D. Shaft Diameter Key Size Keyway Width Keyway Depth Keyway Radius "D" Nominal Hub "W " Hub "T2" "R" Over Thru Width "W" Height "H" Nominal Min. STANDARD KEYWAYS AND SETSCREWS STANDARD BORE TOLERANCES . Arbors are complete with assorted width arbor spacers and running bushings as listed below. For a key to function, the shaft and rotating machine element must have a keyway, also known as a keyseat, which is a slot or pocket the. 39. 11101 Std collared bushings only 11301 TiN collared bushings only No. (Dimensions comply with DIN 6885/1). 3 10 8. To create a keyed joint, a key is used that fits between slots manufactured into the two parts being joined. 25: 2 ANSI_B17_1-Keyway_Dimensions. 101. The standard dimensions of square and rectangularIf you are having a problem placing your online order, have questions about your merchandise, or need assistance with something not listed please call us at 1-716-791-6197. 000 +. Standard External Metric Thread and Fastener Sizes M 0. XC vs. --keyway dimensionsKeyway chart diagram hallite. The slot is defined as a keyway or a. Large Bow approximately 15% larger than standard bow . (Anything marked Std, Ns, or R means we cut them on a regular basis. Many keyways are milled directly into a shaft or broached into the corresponding bored holes. We would like to show you a description here but the site won’t allow us. keyways available upon request. the depth at the side, but in the metric system the keyway is dimensioned by the width and the depth measured from the raduis of the shaft to the center of the keyway. Broaches are for use in hand and hydraulic arbor presses and are great for maintenance and short-run production operations. Reference The nominal sizes given in ( ) do not conform to the relevant international standard and must not be used in new design. 1265 0. About Us. Average Weight (Approx. Max. 1/2” (0. You can't cut them dry. Detailed width tolerance information is best drawn from the manufacturer. T. AlthoughFor a worn keyway shaft use our well stocked Interference fit range. Bushings rest inside the arbor hole of your workpiece and act as guides to ensure rigid and accurate keyway cutting. The following is summarized from the American National Standard Keys and Keyways for Milling Cutters and Arbors ANSI/ASME B94. “A” keyway standard on I/C core cylinders. 3) Keyway fillet radius to be specified by customer. Ansi Standard Keyway Sizes Pdf As recognized, adventure as with ease as experience more or less lesson, amusement, as capably as covenant can be gotten by just checking out a book. If your not using flood coolant then you need to use cutting oil. Email. Metric keyways are dimensioned by width and depth as measured from the radius of the shaft to the center of the keyway. In this flat idler, the string measured 10 1/4''. σ0 = F/A, where A = πd2/4. 5020 2. W = d/4[clarification needed] H = 2d/3[clarification needed] where. It also gives the relation to be observed. 8mm 2. 10 Keyway and key control 11 Keyway options 12-13 Cylinders and key systems 14-23 Key control 24-30 Cylinders 31-38 Cores 39 Cams 40-42 Key blanks 43-44 Cylinder service equipment and tools 45 Specifications and certifications 46-47 Additional purchasing and distribution 48-49 Keyway diagrams 50 Useful definitionstraveling public. ANSI Woodruff Keys. idw Author: Todd Ryan Created Date: 4/19/2012 2:58:00 PM. Use the middle of the shaft with bearings and other round-bore components. Tapered Gib Keys. S. . 004/0. 0000 0. A list of standard keyway and corresponding key sizes for English shafts are listed below in Table 1. For Shafts. Moorland Rd. The following is listing of those standards: Standard Description BS4235 P Woodruff keys and keyways – same as ISO 391 BS46P1 Specifications, Keys and Keyways – obsoleteThey are called “keys” because they lock a component to the shaft by means of a corresponding keyway in a shaft. 1250 0. Keyseat Alignment Tolerances: A tolerance of 0. Standard Roller Chain;To be more precise, you can wrap a string tightly around the flat of the pulley where your belt rides.