... -88) C) UK: BS4592-1987 D) Australia: AS1657-1985 E) Japan: JJS.4) Galvanized steel grating (Professional Factory)specification:1) Bearing Bar ... , America standard is available :1'' x 3/16'', 1 1/4'' x 3/16'', 1-1/2'' x 3/16'', 1 ... '' x 1/4'', 1-1/4'' x 1/4'', 1 1/2'' x 1/4''(19-w-4) and so on.(3)There ... the sides Shape of the bearing barP=Plain S=Serrated(4)There are four types-G,B,PT,U for the ...