{"id":2131,"date":"2026-08-28T13:37:35","date_gmt":"2026-08-28T05:37:35","guid":{"rendered":"https:\/\/yfnsktd.com\/?post_type=news&p=2131"},"modified":"2026-08-28T13:37:35","modified_gmt":"2026-08-28T05:37:35","slug":"roller-chain-sprockets-pitch-bore-and-standards-guide","status":"publish","type":"news","link":"https:\/\/yfnsktd.com\/es\/news\/roller-chain-sprockets-pitch-bore-and-standards-guide\/","title":{"rendered":"Pi\u00f1ones para cadenas de rodillos: gu\u00eda sobre paso, di\u00e1metro interior y normas"},"content":{"rendered":"

Equipo de ingenier\u00eda de KTD<\/strong> | Application Engineering & DFM Team | Updated 28,August 2026<\/p>\n

A roller chain sprocket must match the chain’s full designation, not the pitch alone. ANSI #40 and ISO 08B both run a 12.7 mm pitch, yet roller diameter<\/a> and inner width differ, so the tooth gap differs with them. Confirm the standard first, then select bore, hub and strand count.<\/p>\n

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Pi\u00f1ones para cadenas de rodillos: gu\u00eda sobre paso, di\u00e1metro interior y normas<\/p><\/div>\n

What the number on the chain is telling you<\/b><\/strong><\/h2>\n

ANSI numbering is compact and easy to misread. The digits before the last one give the pitch in eighths of an inch. The last digit describes the construction: 0 for a standard roller chain, 1 for the lightweight series, 5 for a rollerless bushing chain.<\/p>\n

So #60 is a 6\/8 inch, or 19.05 mm, pitch standard roller chain. #35 is a 3\/8 inch pitch rollerless chain, which is why a #35 sprocket has a different tooth profile from a #40 despite both looking similar on a shelf. A trailing H marks the heavy series with thicker link plates, and a trailing -2 or -3 marks the strand count.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
ANSI number<\/b><\/strong><\/td>\nTono<\/b><\/strong><\/td>\nDi\u00e1metro del rodillo<\/b><\/strong><\/td>\nTypical torque band<\/b><\/strong><\/td>\n<\/tr>\n
25<\/td>\n6.35 mm (1\/4″)<\/td>\n3.30 mm<\/td>\nLight instrumentation, small indexing drives<\/td>\n<\/tr>\n
35<\/td>\n9.525 mm (3\/8″)<\/td>\nRollerless bushing<\/td>\nLight machinery, low speed<\/td>\n<\/tr>\n
40<\/td>\n12.70 mm (1\/2″)<\/td>\n7.92 mm<\/td>\nGeneral machine drives, packaging equipment<\/td>\n<\/tr>\n
41<\/td>\n12.70 mm (1\/2″)<\/td>\n7.77 mm, narrow plates<\/td>\nLight duty, agricultural and OEM subassemblies<\/td>\n<\/tr>\n
50<\/td>\n15.875 mm (5\/8″)<\/td>\n10.16 mm<\/td>\nMid-range machinery drives<\/td>\n<\/tr>\n
60<\/td>\n19.05 mm (3\/4″)<\/td>\n11.91 mm<\/td>\nHeavier machine drives, mixers, conveyors<\/td>\n<\/tr>\n
80<\/td>\n25.40 mm (1″)<\/td>\n15.88 mm<\/td>\nHeavy industrial drives<\/td>\n<\/tr>\n
100<\/td>\n31.75 mm (1-1\/4″)<\/td>\n19.05 mm<\/td>\nHeavy low-speed drives<\/td>\n<\/tr>\n
120<\/td>\n38.10 mm (1-1\/2″)<\/td>\n22.23 mm<\/td>\nBulk handling, process equipment<\/td>\n<\/tr>\n
140<\/td>\n44.45 mm (1-3\/4″)<\/td>\n25.40 mm<\/td>\nHeavy process machinery<\/td>\n<\/tr>\n
160<\/td>\n50.80 mm (2″)<\/td>\n28.58 mm<\/td>\nVery high torque, low speed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

ASME B29.1-2011 (R2022), published by ASME and available through ANSI, is the governing reference for these dimensions and for the associated sprocket tooth form in the North American market.<\/p>\n

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Pi\u00f1ones para cadenas de rodillos: gu\u00eda sobre paso, di\u00e1metro interior y normas<\/p><\/div>\n

Where ISO 606 and DIN 8187 part company with ANSI<\/b><\/strong><\/h2>\n

ISO 606:2015 covers dimensions, tolerances and strength for short-pitch precision rodillo<\/a> and bush chains together with their associated sprockets. It defines two families. The A series maps closely to ANSI sizes. The B series is the European lineage that DIN 8187 also describes, and it does not interchange with ANSI at the same pitch.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
ISO B series<\/b><\/strong><\/td>\nTono<\/b><\/strong><\/td>\nDi\u00e1metro del rodillo<\/b><\/strong><\/td>\nAncho interior<\/b><\/strong><\/td>\n<\/tr>\n
05B<\/td>\n8.00 mm<\/td>\n5.00 mm<\/td>\n3.00 mm<\/td>\n<\/tr>\n
06B<\/td>\n9.525 mm<\/td>\n6.35 mm<\/td>\n5.72 mm<\/td>\n<\/tr>\n
08B<\/td>\n12.70 mm<\/td>\n8.51 mm<\/td>\n7.75 mm<\/td>\n<\/tr>\n
10B<\/td>\n15.875 mm<\/td>\n10.16 mm<\/td>\n9.65 mm<\/td>\n<\/tr>\n
12B<\/td>\n19.05 mm<\/td>\n12.07 mm<\/td>\n11.68 mm<\/td>\n<\/tr>\n
16B<\/td>\n25.40 mm<\/td>\n15.88 mm<\/td>\n17.02 mm<\/td>\n<\/tr>\n
20B<\/td>\n31.75 mm<\/td>\n19.05 mm<\/td>\n19.56 mm<\/td>\n<\/tr>\n
24B<\/td>\n38.10 mm<\/td>\n25.40 mm<\/td>\n25.40 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Put 08B next to ANSI #40 and the problem shows itself:<\/p>\n\n\n\n\n\n\n\n
\u00a0<\/b><\/strong><\/td>\nANSI #40<\/b><\/strong><\/td>\nISO 08B<\/b><\/strong><\/td>\n<\/tr>\n
Tono<\/td>\n12.70 mm<\/td>\n12.70 mm<\/td>\n<\/tr>\n
Di\u00e1metro del rodillo<\/td>\n7.92 mm<\/td>\n8.51 mm<\/td>\n<\/tr>\n
Ancho interior<\/td>\n7.95 mm<\/td>\n7.75 mm<\/td>\n<\/tr>\n
Interchangeable?<\/td>\nNo<\/td>\nNo<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The 08B roller is 0.59 mm larger and the inner width is 0.20 mm narrower. A #40 sprocket will accept an 08B chain long enough to look like it works, then wear the tooth flanks unevenly because the roller never seats correctly in the pocket. This is the single most common sourcing error we see on machines built with a European gearbox and a North American drive package, or the reverse.<\/p>\n

The 16B case is worse in the other direction: 16B inner width is 17.02 mm against 15.88 mm for #80, so the tooth thickness that fits one will rattle in the other.<\/p>\n

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Pi\u00f1ones para cadenas de rodillos: gu\u00eda sobre paso, di\u00e1metro interior y normas<\/p><\/div>\n

Choosing pitch by application, not by what is on the shelf<\/b><\/strong><\/h2>\n

A larger pitch carries more load per strand and costs less per unit of torque. It also runs rougher, because chordal action grows with pitch and shrinks with tooth count. Machine builders who select on catalogue price alone tend to land one size too coarse and then chase vibration.<\/p>\n\n\n\n\n\n\n\n\n\n
Application condition<\/b><\/strong><\/td>\nSensible pitch band<\/b><\/strong><\/td>\nReasoning<\/b><\/strong><\/td>\n<\/tr>\n
High speed, low torque, smooth motion required<\/td>\n25 to 40<\/td>\nSmall chordal rise; lower dynamic load<\/td>\n<\/tr>\n
General machine drive, moderate speed<\/td>\n40 to 50<\/td>\nWidest availability of bore and hub options<\/td>\n<\/tr>\n
Conveyor<\/a> headshaft, moderate load<\/td>\n50 to 60<\/td>\nTolerates misalignment and contamination better<\/td>\n<\/tr>\n
Heavy low-speed drive, high torque<\/td>\n80 to 120<\/td>\nLoad capacity per strand; slow enough that chordal action is tolerable<\/td>\n<\/tr>\n
Space-constrained but high torque<\/td>\n40 to 60, multi-strand<\/td>\nAdding strands raises capacity without raising pitch diameter<\/td>\n<\/tr>\n
Shock loading or reversing duty<\/td>\nOne size above the calculated requirement<\/td>\nPeak torque, not average torque, drives plate fatigue<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

That last row deserves emphasis. A drive sized on nameplate motor power with no service<\/a> factor applied will run correctly on a test bench and fail in a plant where the machine jams twice a shift.<\/p>\n

Single, double or triple strand<\/b><\/strong><\/h2>\n

Adding a strand does not double capacity. The load does not distribute evenly across strands because of manufacturing variation in the sprocket tooth alignment and in the chain itself. The multi-strand factors used in drive calculations reflect that:<\/p>\n\n\n\n\n\n\n\n
Hilos<\/b><\/strong><\/td>\nMulti-strand factor<\/b><\/strong><\/td>\nNotes<\/b><\/strong><\/td>\n<\/tr>\n
1<\/td>\n1.00<\/td>\n\u2014<\/td>\n<\/tr>\n
2<\/td>\n1.70<\/td>\nMost common upgrade path<\/td>\n<\/tr>\n
3<\/td>\n2.50<\/td>\nRequires tighter shaft alignment<\/td>\n<\/tr>\n
4<\/td>\n3.30<\/td>\nDiminishing return; consider a larger pitch instead<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Multi-strand sprockets carry a transverse pitch, the centre distance between strands, which determines overall hub width and the space your machine frame must allow:<\/p>\n\n\n\n\n\n\n\n\n\n\n
ANSI size<\/b><\/strong><\/td>\nTransverse pitch<\/b><\/strong><\/td>\n<\/tr>\n
35<\/td>\n10.13 mm<\/td>\n<\/tr>\n
40<\/td>\n14.38 mm<\/td>\n<\/tr>\n
50<\/td>\n18.11 mm<\/td>\n<\/tr>\n
60<\/td>\n22.78 mm<\/td>\n<\/tr>\n
80<\/td>\n29.29 mm<\/td>\n<\/tr>\n
100<\/td>\n35.76 mm<\/td>\n<\/tr>\n
120<\/td>\n45.44 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Two decisions follow from this. First, a duplex sprocket needs its two tooth rows cut in one setup to hold row-to-row alignment; that is a manufacturing requirement, and it is worth confirming on a quotation rather than assuming. Second, replacement practice changes. Multi-strand chain is supplied as a matched set, and replacing one strand of a duplex drive puts a stretched strand next to a new one, which loads the new strand almost alone.<\/p>\n

Tooth count and pitch diameter<\/b><\/strong><\/h2>\n

The pitch diameter follows directly from pitch and tooth count:<\/p>\n

PD = P \u00f7 sin(180\u00b0 \u00f7 N)<\/strong><\/p>\n

For a #50 sprocket (15.875 mm pitch) with 19 teeth: sin(180 \u00f7 19) = sin(9.4737\u00b0) = 0.16459, giving PD = 15.875 \u00f7 0.16459 = 96.45 mm.<\/p>\n

Practical limits on N:<\/p>\n

    \n
  1. Below 17 teeth, chordal action becomes significant and articulation angle rises; acceptable at low speed, punishing at high speed.<\/li>\n
  2. Below 15 teeth, expect audible speed variation and shortened chain life in most industrial drives.<\/li>\n
  3. Above roughly 120 teeth, chain elongation causes the chain to ride up the teeth before wear limits are reached elsewhere, so large sprockets tolerate less stretch than small ones.<\/li>\n
  4. An odd tooth count paired with an even number of chain pitches distributes wear across more tooth-and-roller combinations before the same pairing repeats.<\/li>\n<\/ol>\n

    Point 4 is cheap to apply at design stage and impossible to retrofit without changing the whole drive geometry.<\/p>\n

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    Pi\u00f1ones para cadenas de rodillos: gu\u00eda sobre paso, di\u00e1metro interior y normas<\/p><\/div>\n

    KTD roller<\/a> chain sprocket configurations<\/b><\/strong><\/h2>\n

    The parameters below come from KTD’s published sprocket range.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
    Par\u00e1metro<\/b><\/strong><\/td>\nGama<\/b><\/strong><\/td>\n<\/tr>\n
    Tono<\/td>\nApproximately 1\/4 inch to 2 inches for ANSI configurations, plus metric equivalents<\/td>\n<\/tr>\n
    Strand configurations<\/td>\nSimplex, duplex, triplex, custom multi-strand<\/td>\n<\/tr>\n
    Body types<\/td>\nPlate type, hub type, bore type<\/td>\n<\/tr>\n
    Bore options<\/td>\nPilot bore, finished bore with keyway and set screw, taper-bushed and QD-style configurations<\/td>\n<\/tr>\n
    Materiales<\/td>\n1045 carbon steel, alloy steel, 304 and 316 acero inoxidable<\/a>, specialised custom materials<\/td>\n<\/tr>\n
    Tratamientos superficiales<\/td>\nBlack oxide, zinc plating, specialised anti-corrosion finishes<\/td>\n<\/tr>\n
    Normas a las que se hace referencia<\/td>\nANSI\/ASME B29.1, ISO 606, DIN 8187<\/td>\n<\/tr>\n
    Cantidad del pedido personalizado<\/td>\nDesde 20 unidades, con capacidad para m\u00e1s de 10 000 unidades por tirada<\/td>\n<\/tr>\n
    Formatos de dibujo admitidos<\/td>\nSTEP, IGES, DWG, DXF, SLDPRT, PDF<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Matching body type to how the machine gets built<\/b><\/strong><\/h3>\n\n\n\n\n\n\n\n\n
    Body type<\/b><\/strong><\/td>\nWhat it is<\/b><\/strong><\/td>\nWhen it is the right choice<\/b><\/strong><\/td>\n<\/tr>\n
    Plate type<\/td>\nFlat sprocket, no hub, usually bolted or welded<\/td>\nBolting to a flange, a drum end or a fabricated hub already in the assembly<\/td>\n<\/tr>\n
    Hub type, one side<\/td>\nHub extended on a single face<\/td>\nStandard shaft-mounted drive with a keyway; hub gives thread depth for set screws and axial location<\/td>\n<\/tr>\n
    Hub type, both sides<\/td>\nHub extended on both faces<\/td>\nWide keyway engagement needed, or the sprocket must sit centrally on a bearing span<\/td>\n<\/tr>\n
    Bore type \/ finished bore<\/td>\nMachined to final bore and keyway<\/td>\nDirect fit where shaft size is fixed and known at order time<\/td>\n<\/tr>\n
    Taper-bushed \/ QD<\/td>\nSplit taper bushing clamps the sprocket<\/td>\nFrequent removal, field bore changes, or when hub concentricity matters more than cost<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    The taper-bushed option is underrated by machine builders and overrated by nobody. It costs more up front and adds axial length. It also lets a service technician pull the sprocket without a puller and without heating the hub, and it lets you stock one sprocket against several shaft diameters. On a machine with a documented service interval, it usually pays back.<\/p>\n

    Pilot bore is the opposite trade. It ships fast and cheap, and it moves the finish-boring and keyseating operation into your shop, along with responsibility for the concentricity between bore and pitch diameter. That is fine if you have the fixture. It is a hidden cost if you do not.<\/p>\n

    Bore tolerance follows the ISO limits-and-fits system in the same way as our other shaft-mounted components: H7 as the working default, H6 where a precision ground shaft and controlled runout are part of the accuracy budget.<\/p>\n

    Material and finish, tied to environment<\/b><\/strong><\/h2>\n\n\n\n\n\n\n\n\n
    Medio ambiente<\/b><\/strong><\/td>\nMaterial<\/b><\/strong><\/td>\nFinish<\/b><\/strong><\/td>\n<\/tr>\n
    Dry indoor machinery, general duty<\/td>\n1045 carbon steel<\/td>\nBlack oxide<\/td>\n<\/tr>\n
    Higher torque, shock loading<\/td>\nAcero aleado<\/td>\nBlack oxide, or specify hardened teeth at enquiry<\/td>\n<\/tr>\n
    Humid, outdoor, occasional washdown<\/td>\n1045 carbon steel<\/td>\nZinc plating or specialised anti-corrosion finish<\/td>\n<\/tr>\n
    Food, pharmaceutical, chemical washdown<\/td>\nAcero inoxidable 304 o 316<\/td>\nAs-machined or passivated<\/td>\n<\/tr>\n
    High chloride exposure<\/td>\n316 stainless steel<\/td>\nAs-machined<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Stainless carries a cost people expect and a strength penalty they often do not. 304 has lower yield strength than 1045 carbon steel, so a stainless sprocket in a high-torque drive may need a larger pitch or an extra strand to reach the same capacity. Specify the environment and the torque together, or the material selection will optimise for one and quietly compromise the other.<\/p>\n

    Tooth hardening is a specification worth raising at enquiry rather than assuming. It matters most on the smaller sprocket of a drive, which sees every chain articulation far more often than the larger one.<\/p>\n

    Compared with the size charts and numbering explanations that dominate this search \u2014 most of which stop at the dimensional table \u2014 the connection between standard designation, body type and material environment is where sourcing errors actually occur.<\/p>\n

    Specifying a sprocket so it arrives correct<\/b><\/strong><\/h2>\n
      \n
    1. State the standard and the full designation: “ANSI #50” or “ISO 10B”, not “5\/8 inch pitch.”<\/li>\n
    2. State strand count and confirm whether the chain is a matched multi-strand set.<\/li>\n
    3. State tooth count, and check the small sprocket against the minimum tooth guidance above.<\/li>\n
    4. State body type: plate, single-side hub, double-side hub, or taper-bushed with the bushing series.<\/li>\n
    5. State bore nominal, tolerance grade, and keyway dimensions with their own tolerance, or specify pilot bore explicitly if you will machine it.<\/li>\n
    6. State the material and the environment separately; the environment is what lets a DFM review challenge the material.<\/li>\n
    7. State the surface treatment and whether the bore is masked or treated.<\/li>\n
    8. Send the 3D model alongside the dimensioned PDF so the review catches conflicts between them before tooling.<\/li>\n
    9. For multi-strand, state the required row-to-row alignment tolerance if your drive is speed-sensitive.<\/li>\n<\/ol>\n

      Manufacturing then runs through DFM review, prototype, First Article Inspection, series production and CMM plus material inspection before shipment, under KTD’s stated ISO 9001:2015 quality management system. The International Organization for Standardization identifies ISO 9001 as the internationally recognised quality management system standard.<\/p>\n

      Preguntas frecuentes<\/b><\/strong><\/h2>\n

      Q: Can I use an ANSI #40 sprocket with an 08B chain in an emergency?<\/strong><\/h3>\n

      A: It will engage and run. Roller diameter differs by 0.59 mm, so the roller seats incorrectly and tooth flank wear accelerates on both parts. Treat it as a get-the-line-moving measure with a scheduled replacement, not a substitution.<\/p>\n

      Q: What is the difference between DIN 8187 and DIN 8188?<\/strong><\/h3>\n

      A: DIN 8187 covers the B series described above. DIN 8188 covers the A series, which corresponds to ANSI dimensions. If a European drawing calls out DIN 8188, the ANSI equivalent is usually a direct match; if it calls out DIN 8187, it is not.<\/p>\n

      Q: How many teeth should the small sprocket have?<\/strong><\/h3>\n

      A: 17 or more for general industrial drives. Fewer is acceptable at low speed with a shorter expected life, and 15 is a practical floor for most roller chain work.<\/p>\n

      Q: Does a duplex sprocket double the drive capacity?<\/strong><\/h3>\n

      A: No. The standard multi-strand factor for two strands is 1.70, because load does not share evenly between strands.<\/p>\n

      Q: Should I order pilot bore or finished bore?<\/strong><\/h3>\n

      A: Finished bore if you do not have a boring and keyseating fixture, because concentricity between bore and pitch diameter is what controls runout. Pilot bore if shaft sizes change late in your build and you can hold that concentricity in-house.<\/p>\n

      Q: What do custom sprockets cost?<\/strong><\/h3>\n

      A: Pricing is project-specific and provided upon quotation based on material, dimensions, machining complexity, quantity, surface treatment and other technical requirements. Strand count, body type and stainless material all move the number, which is why quotations are issued against a drawing rather than a size description.<\/p>","protected":false},"excerpt":{"rendered":"

      C\u00f3mo se corresponden las designaciones ANSI\/ASME B29.1, ISO 606 y DIN 8187 con el paso, el di\u00e1metro interior y el tipo de cubo de las ruedas dentadas, con una tabla de correspondencias entre el paso y la aplicaci\u00f3n y una gu\u00eda para la selecci\u00f3n de ruedas dentadas de m\u00faltiples hilos.<\/p>","protected":false},"featured_media":2132,"comment_status":"closed","ping_status":"closed","template":"","class_list":["post-2131","news","type-news","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/yfnsktd.com\/es\/wp-json\/wp\/v2\/news\/2131","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yfnsktd.com\/es\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/yfnsktd.com\/es\/wp-json\/wp\/v2\/types\/news"}],"replies":[{"embeddable":true,"href":"https:\/\/yfnsktd.com\/es\/wp-json\/wp\/v2\/comments?post=2131"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yfnsktd.com\/es\/wp-json\/wp\/v2\/media\/2132"}],"wp:attachment":[{"href":"https:\/\/yfnsktd.com\/es\/wp-json\/wp\/v2\/media?parent=2131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}