| Modulus |
= m =  |
| Aantal tanden van het rondsel |
= z =  |
| Aantal tanden van de heugel |
= zc =  |
| Steek in mm |
= p = m.p =  |
| Normaalbasissteek in mm |
= pb = p.cosa |
| Kophoogte in mm |
= ha = m |
| Voethoogte in mm |
= hf = 1,16m (a=14°30’) |
| |
= hf = 1,25m (a=20°) |
| Tandhoogte in mm |
= h = ha + hf = 2,16m of 2,25m |
| Tandbreedte in mm |
= b = 10.m |
| Velgdikte onder de tand in mm |
= H = h(normal) |
| Lengte van de heugel in mm |
= Lc = m.zc.p = p.zc |
| Afstand as rondsel tot steeklijn van heugel in mm |
= a =  |
| Afstand as rondsel tot rugvlak van heugel in mm |
= A =  + hf + H = m.(1,16 +  )
+ H |
| |
= A = + hf + H = m.(1,25 + )
+ H |
