Standards we use

Dimensions you don't set yourself come from standards: tooth profile, keyway, belt grooves, fastener holes. Below is where each one comes from, template by template.

  • per standarddimensions taken from the standard text
  • being checkedentered from handbooks, being checked
  • approximatebuilt from open data
  • catalogueno standard — manufacturer catalogues
ReferenceKeys, clearance holes, counterbores, tap drills, gear modules, V-belt grooves, PR chains, retaining ring grooves, centre holes. Enter a size to get the answer. The same tables the templates use. Open →

Chain sprocket

Open template →
PR chains GOST 13568-97 per standard
Tooth profile GOST 591-69 per standard
ISO chains ISO 606 (A = ANSI B29.1, B = DIN 8187) being checked
Motorcycle chains ISO 10190 being checked
Keyway DIN 6885-1 / GOST 23360-78 per standard
Taper Lock bush manufacturer catalogues catalogue

ISO 606 and motorcycle chain sizes were entered from reference data and are being checked against the standard text.

Timing belt pulley with hub

Open template →
Inch MXL…XXH ISO 5294 per standard
HTD, GT, STD ISO 13050 approximate
T, AT ISO 17396 / DIN 7721 approximate
Keyway DIN 6885-1 / GOST 23360-78 per standard
Taper Lock bush manufacturer catalogues catalogue

HTD, GT, STD, T and AT groove profiles are built from open data and marked “approximate profile” on the template page. That is enough for printing and most drives; exact figures will come once the standards are purchased.

For “New part”

When a part is described in words, the assistant takes dimensions from the same tables, plus shafts: retaining ring grooves GOST 13942-86 / DIN 471 and centre holes GOST 14034-74.

What the model does not define

  • tolerances and fits;
  • surface roughness;
  • material, heat treatment, coating;
  • technical requirements for the drawing.

That stays with the designer and the drawing.

Found a mismatch with a standard? Let me know and I'll fix it.