Nisbah panghantaran nominal: 8 10 12.5 16 20 25 31.5 40 50
Makna kod: W H T X S C siput, busur, melalui, bawah, atas, sisi
Jarak tengah: 42 65 80 100 120 125 150 160 180 200 210 250 280 300 320 360 400 420 450 500

WHT42, WHT65, WHT80, WHT100 WHX120, WHX125, WHX150, WHX160, WHX180, WHX200, WHX210, WHX250, WHX280, WHX300, WHX320, WHX360, WHX400, WHX420, WHX450, WHX500