Yale Assure Lock SL YRD256 Installation And Programming Instructions page 27

Check Door Compatibility
2 1/8"
minimum
Deadbolts
1-3/4" 2-1/4"
to door thickness
Interconnected
1-3/8" 1-3/4"
to door thickness
Levers
1-3/8" 1-3/4"
to door thickness
2 1/8"
minimum
YRD216 YRD226
YRC216
YRC226
YRL210
YRL220
YRD256/156
1-3/8" 2-1/4"
to
door thickness
YRC256
YRL216
YRL226
4"
center to center
minimum
4" or 5.5"
center to center
YRL236
YRL256