SAME DAY & EXPEDITED SHIPPING AVAILABLE
Posted by National Lock Supply on Oct 6th 2026
Quick Verdict
Choose the mount by what is behind the door at full open. A solid, reinforced wall with a box in it takes a concealed wall unit: LCN SEM7840 or SEM7850 recessed, or Rixson 998M (3-5/8 in. projection, about $485 at NLS). A wall you cannot open takes a surface unit: LCN SEM7830, Sargent 1560 or Rixson 996M. No wall within reach of the door takes a floor unit: LCN SEM7820 or Rixson 980M. LCN SEM 7800 and Sargent 1560/1561 units hold 35… Read more