Selection Guide

32 STEEL CITY® METALLIC BOXES & COVERS
Knockouts (in.)
Cat. No.
Depth
(in.)
Capacity
(cu. in.)
Ea. side
Conduit
Ea. end
Conduit
Std.
Ctn.
 

  

 

 
 

  

 

 
Cat. No.
Depth
(in.)
Capacity
(cu. in.) Description
Construction
Type
Std.
Ctn.
 

  Extension Ring
One

" KO in each of four sides*
Drawn 
 

  Extension Ring
One

" KO in each of two
opposite sides and one

" KO
in other two sides*
Drawn 
—

—

—
Round/octagon boxes and accessories
4"
Octagon box extension rings
—
4"
Octagon box extension rings
—
4"
Octagon box extension rings
551511/2-25
500-K-3/4 500-TL 501-CA 501-CS
4-OD-EXT-1/2
55151 1/2 3/4
4-OD-EXT-SPL
—

Cat. No.
Capacity
(cu. in.) Description
Std.
Ctn.
 – 
One

" KO in center*

 – 


 


Open plaster ring with ears. Ears tapped



" on centers. Special screw-lock feature in slots*

 


Open plaster ring with ears. Ears tapped



" on centers. Special screw-lock feature in slots*

*Fits any Steel City® 4" octagonal outlet box or extension ring.
*Uses Steel City® 4" octagonal outlet boxes and 500 series rings and covers.