GT2 timing pulleys 18T to 60T: pitch and outside diameter, flange, bores 5 / 6 / 8 mm, 6 and 9 mm belts (+ 64 to 80T diameters) — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/gt2-timing-pulleys-18-60t-bores/ (sheet CC BY 4.0) Basis: Misumi 2GT pulley table (PD, OD, F, belt-width block, bores) checked against PD = 2 N / pi and OD = PD − 0.508; SDP/SI cross-check; Misumi linked for CAD Catalog version: 2026-10-20 Sizes: see table below - GT2 (2GT, 2 mm pitch): pitch diameter PD = teeth x 2 / pi and outside diameter OD = PD − 0.508 mm (pitch-line differential 0.254 mm). Misumi's 2GT table (14 to 60 teeth) is the source of the first 21 rows; PD and OD of every one of them agree with that rule to rounding (checked in the generator). Rows for 64 to 80 teeth (bottom) are the same rule, not a maker table: Misumi stops at 60T, so no flange Ø is given for them. - F is Misumi's flange diameter (its flange-cut rule reads FC >= OD + 1 and FC <= F − 2). Misumi's belt-width block prints three numbers per belt width: A, W and L = belt 4 mm (GT2040): A 5.0, W 8.3, L 16.0; belt 6 mm (GT2060): A 7.0, W 10.3, L 18.0; belt 9 mm (GT2090): A 10.0, W 13.3, L 21.0. The text read does not define A, W or L; the files use A as the width of the toothed section (it is 1 mm more than the belt on all three belts). SDP/SI's 60T / 9 mm belt / 6 mm bore pulley prints PD 38.2, OD 37.7, hub Ø31 and overall length 21.4, the same PD and OD. - Bore: the last column is the first range printed in Misumi's bore-selection grid for that tooth count (a text extraction of a table, so ranges can be off by a column). 5 mm only reaches 30T there; 16T is listed with 3 and 4 mm bores only (the existing gt2-pulleys page has a 16T / 5 mm bore file). - Files: 23 pulleys, 18T to 60T, for 6 mm belts (tooth section 7 mm) and 9 mm belts (10 mm), bores Ø5, Ø6 and Ø8 where Misumi's range allows them. Each is a toothed ring with a flange Ø F on both sides and a plain bore at the nominal diameter. Tooth form: round grooves (the same approximation as the gt2-pulleys page), NOT the Gates profile, which is not published; use it for clearance and fit, not belt-grade meshing. Flange thickness 1 mm is an example. No hub, no set-screw holes: the hub diameter is not in the text read. - Left out: the 10 mm belt width (no table read gives its pulley widths), 16T and 61 to 80T files (no flange Ø in the sources), hubs and set screws, 14 / 15 / 21 / 22 / 25 / 26 / 28 / 32 / 34 / 38 / 44 / 50T (in the table, no file). teeth pitch Ø PD, mm outside Ø OD, mm flange Ø F, mm bore range, mm (plain bore) 14 8.91 8.40 13 3 15 9.55 9.04 14 3 to 4 16 10.19 9.68 14 3 to 4 18 11.46 10.95 16 4 to 5 20 12.73 12.22 17 4 to 6 21 13.37 12.86 18 4 to 6 22 14.01 13.50 18 not in the text read 24 15.28 14.77 20 5 to 8 25 15.92 15.41 20 5 to 8 26 16.55 16.04 21 5 to 8 28 17.83 17.32 23 5 to 10 30 19.10 18.59 24 5 to 11 32 20.37 19.86 25 5 to 13 34 21.65 21.14 27 6 to 14 36 22.92 22.41 27 6 to 14 38 24.19 23.68 29 6 to 16 40 25.46 24.95 30 6 to 17 44 28.01 27.50 32 6 to 19 48 30.56 30.05 35 8 to 22 50 31.83 31.32 36 8 to 23 60 38.20 37.69 42 8 to 29 64 40.74 40.24 — — 68 43.29 42.78 — — 70 44.56 44.06 — — 72 45.84 45.33 — — 80 50.93 50.42 — — Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Misumi (catalog PDF, Mexico site): 2GT high torque timing pulleys: teeth, pitch diameter, outside diameter, flange F, belt-width block A / W / L, bore selection (CAD from Misumi's configurator) — web — Publisher's page; dimensions are facts — https://mx.misumi-ec.com/en/pdf/fa/2019/2019_MX_1340.pdf - SDP/SI: A 6A51M060DF0906: 60-groove 2 mm (GT2) pulley, 9 mm belt, 6 mm bore: PD 38.2, OD 37.7, hub 31, overall length 21.4 — web — Publisher's page; dimensions are facts — https://shop.sdp-si.com/a-6a51m060df0906.html - Pfeifer Industries: Timing belt pulley PD / OD charts: PD = pitch x teeth / pi, OD = PD - 2 U (U = cord to tooth root) — web — Publisher's page; dimensions are facts — https://www.pfeiferindustries.com/information.php?info_id=12 Free files (CC BY 4.0, Xem Studio; STEP + STL, 23 parts): https://xemstudio.com/files/hardware/gt2-timing-pulleys-18-60t-bores/index.json API: https://xemstudio.com/api/geometry?object=gt2-timing-pulleys-18-60t-bores