The Schlage XQ02-309 is the 10-013 T-strike with a 7/8" flat lip, the OEM option code specifying a shorter, non-curved lip on the standard square corner T-strike with box for Schlage ND Series cylindrical locks. This is Schlage's specific answer to the question "is there a flat lip option for the ND Series?" - and the answer, per the official Allegion knowledge base, is exactly two configurations: XQ02-309 for the 10-013 strike at 7/8", and XQ07-351 for the 10-025 strike at 7/8". This page covers the 10-013 version.

The base 10-013 is a square corner T-strike with an included strike box, measuring 1-1/8" x 2-3/4" on the face. It's the standard ND Series T-strike, available in multiple lip lengths - standard lip at 1-1/8", extended options at 1-3/8" and 1-1/2". The XQ02-309 configuration drops the lip to 7/8" and eliminates the curved/angled profile in favor of a flat lip, making it compatible with frame conditions where the standard curved lip creates a fit or clearance problem.

What "Flat Lip" Means on a Schlage Strike Plate

A standard door strike lip is angled or curved - it projects out from the face of the strike at a downward angle to guide the latch bolt into the keeper pocket as the door closes. That curve is engineered for a specific clearance relationship between the door edge and the door stop on the jamb.

The flat lip removes that angle. The lip extends straight out from the strike face without the downward curve, which matters in two scenarios: first, when the frame profile or stop configuration doesn't allow the standard curved lip to seat properly against the jamb without binding or standing proud; second, when the door-to-frame gap or frame rabbet depth requires a flush, non-angled lip to sit correctly. In retrofit applications where a previous strike has worn or distorted the frame pocket, a flat lip can also seat more cleanly than a curved one against an irregular surface.

The 7/8" lip length is shorter than all standard 10-013 lip configurations (1-1/8", 1-3/8", 1-1/2"). That shorter dimension further accommodates tighter clearance conditions and specific frame depths where a longer lip would overhang incorrectly.

Schlage 10-013 Strike: ND Series and D Series Compatibility

The 10-013 is the standard T-strike for D Series (knobs) and ND Series (levers) in Schlage's product line. For the ND Series, the 10-013 is an optional strike - the ND Series ships with the ANSI curved lip strike 10-025 (1-1/4" x 4-7/8") as the standard configuration. The 10-013 T-strike is specified when the frame calls for a T-strike profile rather than an ANSI full-width strike. Both wood and metal jamb templates are available - J928 for wood, J929 for metal - from the Schlage template index.

The strike box included with the 10-013 provides a recessed keeper pocket in the frame behind the strike face, allowing the latch bolt to project fully into the frame without contacting the back of a shallow mortise. This is critical for correct latching and for maintaining the fire rating on rated assemblies.

Schlage ND Series Lock Parts: Strike Ordering Notes

When specifying the 10-013 with a flat lip for an ND Series installation, the XQ02-309 option code must be called out at time of order. The standard 10-013 ordered without the XQ02-309 specification ships with the standard 1-1/8" curved lip. The companion flat lip option for the 10-025 ANSI strike is XQ07-351 if the standard ANSI strike is specified instead.

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