Don-Jo MEST-158 Extended Lip Mortise ASA Strike

Don-Jo Manufacturing's MEST-158 is a 13-gauge (.095) extended lip mortise ASA strike engineered for doors prepared with a mortise-style keeper cutout that require a longer lip to bridge the gap between the frame and the latch bolt. The MEST-158 measures 4-7/8" in height with a 1-5/8" lip — that lip dimension running from the center of the screw hole to the end of the lip — giving installers and specifiers the reach needed on thicker or offset door frames where a standard-length mortise strike falls short. A single latch hole accommodates the latch bolt, keeping the faceplate clean and structurally sound. This extended lip mortise strike ships in your choice of three finishes: 630 satin stainless steel (US32D), Duranodic dark bronze (Don-Jo DU), and 622 / US19 flat black — a finish lineup that covers commercial, institutional, and architectural applications alike. Because it carries the 4-7/8" ASA hole pattern, the MEST-158 drops in as a direct replacement or new-installation mortise strike wherever an extended lip is required to properly capture and protect the latch bolt.

MEST-158 Extended Lip Mortise Strike — Key Features

• Extended Lip Reach: 1-5/8" lip measured from the center of the screw hole to the end of the lip, designed to span larger frame-to-door gaps that a standard mortise strike cannot cover.
• Heavy 13-Gauge Construction: Formed from 13 ga. (.095) non-ferrous material for a rigid, durable strike face suited to commercial and institutional door hardware schedules.
• ASA Mortise Strike Pattern: The 4-7/8" height conforms to the standard ASA mortise strike footprint, making the MEST-158 a reliable fit for mortise-prepped frames and a straightforward replacement strike in retrofit projects.
• Single Latch Hole: One precision-formed latch cutout centers the bolt correctly within the strike box, reducing rattling and maintaining consistent latch engagement over time.
• Three Architectural Finishes: Available in 630 satin stainless steel (US32D), Duranodic dark bronze (Don-Jo DU), and 622 / US19 flat black to coordinate with surrounding door hardware and frame finishes.
• Non-Handed Design: A single SKU installs on either hand of door without modification, simplifying ordering for mixed-door projects.
• Convenient Shelf Pack: Available in packs of 5, making the MEST-158 practical for multi-door commercial installations and hardware supply stocking.

Technical Details

How to Order

Select the MEST-158 in your required finish — 630 (satin stainless steel / US32D), DU (Duranodic dark bronze), or 622 (flat black / US19) — at the time of order. The MEST-158 is a non-stock item that ships directly from Don-Jo Manufacturing; please allow 3–10 business days lead time for fulfillment.