The Schlage 48029970 is the OEM spacer kit for ND Series indication trim locks installed on doors with a thickness of 1-3/8 inch through less than 1-1/2 inch. All Schlage ND Series indication trim assemblies are designed and calibrated for standard 1-3/4 inch door thickness. When the door is thinner than that, the trim components don't seat correctly against the door face, the rose plate gaps, and the indicator window doesn't sit flush. The 48029970 spacer kit bridges that gap by adding the correct amount of material between the trim and the door face so the indicator assembly behaves exactly as it would on a standard 1-3/4 inch door.

This is a finish-specific kit. The spacer is a visible component that wraps the outside of the indicator trim assembly, so it has to match the finish of the installed lock. Specify finish when ordering.

Schlage Thin Door Spacer for ND Series Indicator Trim

ND Series indicator trim is confirmed in the official Schlage ND Series installation instructions to require the 48029970 spacer kit for the following door thickness applications: 1-3/8 inch through less than 1-1/2 inch. The spacer requirement is called out explicitly across multiple ND Series indicator installation guides, covering functions including the ND40 bath/bedroom privacy, ND44 hospital privacy, ND50 entrance/office, ND52 keyed privacy, ND53 entrance, ND55 automatic unlocking entrance, ND73 corridor, ND78 classroom security, ND91 Vandlgard entrance/office, ND92 Vandlgard entrance, ND97 Vandlgard corridor, and ND98 Vandlgard classroom security.

Without this spacer, the indicator assembly will not install correctly on a thin door. The rose will stand proud of the door surface, the indicator window will tilt, and the inside mechanism that drives the Occupied/Vacant display won't travel through its full range. The 48029970 is the first spacer in the thin door range. Doors from 1-1/2 inch up to 1-11/16 inch use a different spacer kit. Verify door thickness before ordering.

What ND Series Indicator Trim Requires a Spacer Kit

Standard ND Series cylindrical locks without indicator trim support a much wider door thickness range, from 1-5/8 inch up to 2-1/8 inch standard, with optional configurations up to 6 inches using EE, EI, EO, and ED door position specifications. Indicator trim is a different case. Because the indicator window assembly adds components between the rose and the door, and because the viewing window, indicator sign, and rose must sit in precise relation to each other to display correctly, indicator trims are engineered specifically to 1-3/4 inch standard thickness. Any deviation requires a spacer to compensate.

This matters in real-world projects because thin doors are common in wood-frame construction, interior office partitions, and older institutional buildings where door stiles run narrower than the current steel door standard. If an ND Series indicator lock was specified for a 1-3/4 inch door and the actual door measures closer to 1-3/8 inch, the 48029970 spacer kit is the documented corrective part per Schlage's installation requirements.

Technical Specifications for Schlage 48029970

The 48029970 spacer kit is listed in the Schlage ND Series Service Manual and Schlage Mechanical Price Book. It is available in 10 standard finishes to match any ND Series indicator trim configuration: 626/US26D satin chrome, 626AM/US26D satin chrome antimicrobial, 612/US10 satin bronze, 625/US26 bright chrome, 606/US4 satin brass, 619/US15 satin nickel, 605/US3 bright brass, 613/US10B oil rubbed bronze, 643E aged bronze, and 622/US19 powder-coated matte black.

The Schlage ND Series indicator trim uses a high-density polycarbonate viewing window with red and white messaging backgrounds for readability including color-blind accessibility. The indicator assemblies referenced here cover the ND40, ND44, ND50, ND52, ND53, ND55, ND73, and related indicator functions available on this page.