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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