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Standard Key Slot Dimensions

Standard Key Slot Dimensions Average ratng: 8,3/10 5839 votes

Metric Standard Parallel Keyway and Key Sizes Shaft Diameter (mm) Keyway (mm) Key (mm). From To Width (W) Depth (h) Width (W) Depth (T) 6 8 2 1.0 2 2 9 10 3 1.4 3 3 11 12 4 1.8 4 4 13 17 5 2.3 5 5 18 22 6 2.8 6 6 23 30 8 3.3 8 7 31 38 10 3.3 10 8 39 44 12 3.3 12 8 45 50 14 3.8 14 9 51 58 16 4.3 16 10 59 65 18 4.4 18 11 66 75 20 4.9 20 12 76 86. Engineering ToolBox - SketchUp Extension - Online 3D modeling! Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro.Add the Engineering ToolBox extension to your SketchUp from the.

Slot Dimension Callout

All this does, is calculate the radius height that is added to the ½ dim. That dimension changes with the diameter of the shaft and width of the key. Just did a 7/8' key in 3.4375 shaft.4375 +.057 =.4945. That's how far you go down after touch off. I see the basic M-LOK slot dimensions are available on the web. Where are the dimensions for the M-LOK T-Nut? A: The M-LOK T-Nut is currently under review by the US State Dept to determine its ITAR classification. Until then, dimensioned drawings of the nut will be restricted to verified US citizens, but are available free to all qualified.


The first thing to know about coupling bore and keyway standards is that there are quite a few currently active and available. Given your application and the origin of the product/shaft in question, you should be able to quickly determine what standard applies to you. (If not, call an application engineer at a coupling company you trust... and they will quickly point you in the right direction.)

Active Standards include:

In North America...

  • ANSI/AGMA 9002-B04 - Bores and Keyways for Flexible Couplings (Inch Series)
  • ANSI/AMGA 9112-A04 - Bores and Keyways for Flexible Couplings (Metric Series)
  • ANSI/AGMA 9003-B08 - Flexible Couplings – Keyless Fits
  • ANSI/AGMA 9103-B08 - Flexible Couplings – Keyless Fits (Metric Edition)

  • API STD 610 - Centrifugal Pumps for Petroleum, Petrochemical and Natural Gas Industries
  • API STD 671 - Special Purpose Couplings for Petroleum, Chemical and Gas Industry Services

  • AIA/NAS NA0139 - Keyway and Key Slot Dimensions Metric (an Aerospace standard)

In Germany...

  • DIN 6885-1 - Drive Type Fastenings without Taper Action; Parallel Keys, Keyways, Deep Pattern
  • DIN 7172 - Tolerances and limit deviations for sizes above 3150 mm up to 10000 mm; principles, standard tolerances and limit deviations (ISO 286 Addendum for larger sizes)

In Japan...

  • JIS B 1301:1996 - Keys and their corresponding keyways

And Globally (ISO)...

Standard Key Slot Dimensions Guide

  • ISO 286-2:2010 - Geometrical product specifications (GPS) -- ISO code system for tolerances on linear sizes (Part 1: Basis of tolerances, deviations and fits & Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts)
  • ISO 3912:1977 - Woodruff keys and keyways
  • ISO 3117:1977 - Tangential keys and keyways

In addition to these active standards, the Mechanical Power Transmission Association's excellent (and free) 18 page 'Frequently Asked Questions on Metric Bores and Keyways in Couplings' PDF can be used to discover a number of no longer active (expired or withdrawn) bore and keyway standards. (Note: Unfortunately, the MPTA document does not provide a route to secure these documents... but at least they can confirm the standard you seek did in fact exist at one time.)

To broadly and briefly touch on bore and keyway standards, the North American (inch/imperial) standards tend to be more straight forward with limited variation (derived off the shaft)... while the metric options tend to be much more diverse (and were largely derived off the bore hole and were fragmented by various national approaches). Case in point, the metric standard (ISO 286), calls out over 100 different shaft and bore tolerances! Fortunately, great strides have been made to popularize a much smaller subset of these metric possibilities... and, today, many coupling manufacturers default to using just a few metric tolerances as their standard (with Js9 keyways, and H7 clearance fit or P7 interference tolerances for the bore being a very popular default).
And as a final (also free) reference: Lovejoy's Engineering Data PDF catalog, which covers both inch and metric shaft tolerances in great detail on pages ED-10 through ED-20.
(Bonus Hint: Lovejoy's Engineering Data catalog does comply with and specifically reference ANSI/AGMA 9002-B04 and ANSI/AMGA 9112-A04...and does use Js9 keyways as well as both H7 & P7 as default metric tolerances... so, if your need is narrow in scope, you might possibly consider saving a few bucks by pulling the data you seek directly from Lovejoy.)

DIN 6885/1 :- Definition

Standard Punch Slot Sizes

Drive Type Fastenings without Taper Action; Parallel Keys, Keyways, Deep Pattern

Standard

Metric T Slot Dimensions

d (from) mmd (to) mmbxht1t2
682x21.21
8103x31.81.4
10124x42.51.8
12175x532.3
17226x63.52.8
22308x743.3
303810x853.3
384412x853.3
445014x95.53.8
505816x1064.3
586518x1174.4
657520x127.54.9
758522x1495.4
859525x1495.4
9511028x16106.4
11013032x18117.4
13015036x20128.4
15017040x22139.4
17020045x251510.4
20023050x281711.4
23026056x322012.4
26029063x322012.4
29033070x362214.4
33038080x402515.4
38044090x452817.4
440550100x503119.5

Standard Key Slot Dimensions Calculator

Labels: DIN, Engineering Standards and Codes, feature