1. Fomil empirik pou kalkile gwose a nan boulon estanda ak nwa (gwose wrench) (nan fom lan nan fraksyon):
Creole boulon ak gwose nwa (wrench gwose) = (boulon fil gwose nimerateur × 3) ÷ (boulon nimerateur gwose fil × 2)
Pou egzanp: gwose a wrench ki koresponn ak yon boulon estanda ak 1 / 2 pous fil = (1×3) ÷ (2×2) pous = 3 / 4 pous
2. Fomil empirik pou kalkile gwose a nan boulon filaplon ak nwa (gwose wrench) (nan fom lan nan fraksyon):
Boulon ak gwose nwa (gwose wrench) = boulon estanda ak gwose nwa 1 / 8
Pou egzanp: gwose a wrench ki koresponn ak boulon an fil ak 1 / 2 pous fil = (1×3) ÷ (2×2) pous 1 / 8 = 7 / 8 pous
Gwose a wrench ki koresponn ak boulon an egzagonal:
4mm boulon itilize 7mm wrench; 5mm boulon itilize 8mm wrench;
6mm boulon itilize 10mm wrench; 8mm boulon itilize 12mm oswa 14mm;
10mm boulon itilize 17mmm wrench; 12mm boulon itilize 19mm wrench;
14mm boulon itilize 22mm wrench; 16mm boulon itilize 24mm wrench;
18mm boulon itilize 27mm wrench; 20mm boulon itilize 30mm wrench;
22mm boulon sevi ak yon 32mm wrench; 24mm boulon sevi ak yon 36mm wrench;
Pou 27mm boulon, sevi ak 41mm spaner; 30mm boulon itilize 46mm spanyan;
36mm boulon itilize 55mm vire; 42mm boulon itilize 65mm wrenches;