ANSI 156.4
    Grade 1
     
    NK5051
    K900
    K990
    NSK800
    K700
    NSK600
    ST80
    ST75
     
    EN1154
    (1 hour fire rate)
     
    NSK630
    K730
    NSK830
    K730.BC
    NSK830.BC
    NSK630.BC
    ST80
    ST75
     
    UL228
    (File: R13255)
     
    K70 / NK500
    K700
    NSK600 /NSK800
    K90
    K990
    K900
    NK5051
    ST80
    ST75