Don-Jo MEST-103 Extended Lip Mortise ASA Strike

The Don-Jo MEST-103 is a heavy-duty extended lip mortise ASA strike engineered for doors equipped with mortise locksets that require a longer lip to bridge the gap between the door edge and the frame rabbet. Manufactured by Don-Jo Manufacturing from non-ferrous material at a robust 13 ga. (.095) thickness, this mortise strike delivers the rigidity and dimensional precision that locksmiths and door hardware specifiers demand on commercial and institutional openings. The overall face measures 3" wide by 4-7/8" tall, with the 3" lip measured from the center of the screw hole to the end of the lip — the critical dimension when matching a mortise lock to a specific frame stop depth. A single latch hole accommodates standard mortise latch bolt geometry. Available in three finish options — 630 satin stainless steel (US32D), Duranodic dark bronze (Don-Jo DU), and 622 flat black (US19) — the MEST-103 coordinates with a broad range of mortise hardware finishes across commercial door schedules.

MEST-103 Extended Lip Mortise Strike — Key Features

• Extended Lip Geometry: 3" lip (center of screw hole to lip end) spans the frame rabbet on mortise lock applications where a standard-lip ASA strike falls short.
• Heavy 13 Gauge Construction: Formed at .095" thickness in non-ferrous material, providing the rigidity required on high-cycle commercial openings.
• Mortise ASA Strike Format: Configured specifically for mortise lockset cutouts, making it the correct replacement or new-construction strike for mortise-prepped doors — not a cylindrical latch strike.
• Single Latch Hole: Accepts the latch bolt of a standard mortise lock without modification.
• Three Commercial Finishes: 630 satin stainless steel, Duranodic dark bronze (DU), and 622 flat black coordinate with widely specified mortise hardware finish families.
• Precise Lip Dimension Noted: Don-Jo specifies that the 3" width measurement runs from the center of the screw hole to the end of the lip — an ordering-critical detail for frame stop and lip clearance verification.
• Shelf Pack of 5: Packaged in quantities of five, convenient for contractors and locksmiths stocking multiple openings.

Technical Details

How to Specify / Order

Order by specifying MEST-103 followed by the finish designation: MEST-103-630 for satin stainless steel, MEST-103-DU for Duranodic dark bronze, or MEST-103-622 for flat black. The MEST-103 is a non-stock item that ships direct from Don-Jo; allow 3–10 business days lead time. Before ordering, confirm the frame stop depth against the 3" lip dimension (center of screw hole to lip end) and verify the mortise lock cutout height against the 4-7/8" strike face height to ensure correct fit on your opening.