The Schlage L283-601 is the OEM Vandlgard lock case for the Schlage L Series mortise lock, covering four function variants: LV9050, LV9060, LV9070, and LV9071. It is field reversible, documented in the Schlage L Series Service Manual, and ships in stock. The lock case houses all internal mechanism components and is the primary structural body that all four function variants share. Handing can be changed in the field without disassembling the case.

Platform specifications confirmed across all four functions: ANSI A156.13, Series 1000, Grade 1 Operational and Security. UL listed for 3-hour fire door. Lock body size 4-7/16 inch by 6-1/16 inch by 1 inch. Armored front 1-1/4 inch by 8 inch. 3/4-inch throw stainless steel latch with anti-friction tongue. ANSI curved lip strike, 1-1/4 inch by 4-7/8 inch, dust box standard. Schlage Everest 29 S123 keyway standard (restricts unauthorized key duplication).

Schlage Vandlgard Lock Case: What the Four Functions Do

All four functions share the L283-601 lock case because they belong to the same internal mechanism group in the L Series architecture. The function differences are in trim behavior, not in the case itself.

LV9050 Vandlgard Entrance/Office Lock: Latchbolt operated by key from outside or lever from inside. Inside push button locks the outside lever (office lockdown initiated from inside). Inside lever always free for immediate egress. Vandlgard outside lever rotates freely downward when locked to protect internal components from excessive force.

LV9060 Vandlgard Apartment Entrance Lock: Double cylinder function listed under "Double Cylinder Trim" in the L Series Service Manual. Key required from both sides for lever operation. Used for apartment entrance applications where outside keyed access and inside keyed egress control are both specified. Life safety caution applies to double cylinder applications per the L Series Service Manual: "use is not recommended" unless installation complies with existing codes.

LV9070 Vandlgard Classroom Lock, Exterior Lockdown Only: Single cylinder, "Cylinder Outside Trim" in the L Series Service Manual. The outside lever is made inoperative by key from the outside only. Someone inside the room cannot initiate lockdown from inside. A person with a key on the corridor side locks the outside lever. Inside lever always free for egress. This is the older classroom function format specified before active shooter protocols became standard practice in school security design.

LV9071 Vandlgard Classroom Security Lock, Interior/Exterior Lockdown: Double cylinder, ANSI Function F32. The outside lever is made inoperative by key from EITHER side — outside key OR inside key can initiate lockdown. Latchbolt retracts from either side when unlocked. Inside lever always free for immediate egress regardless of lock state. Outside lever remains inoperative until unlocked by key. Vandlgard option allows outside lever to rotate freely down while locked to protect mechanism from forced lever abuse. This is the current standard specification for school security classroom lockdown hardware — it allows a teacher inside to lock the corridor-facing lever without opening the door or going into the hallway, while keeping inside egress always free.

Schlage L Series Mortise Lock Parts: Vandlgard Feature in the L283-601

The Vandlgard feature integrated into the L283-601 lock case applies to the outside lever when it is in the locked state. Per the official Schlage L Series product documentation: "Vandlgard option allows the outside lever to rotate freely down to prevent damage from excessive force while in a locked state." When someone kicks, stands on, or applies lateral force to the locked outside lever, the lever rotates downward rather than transmitting that force into the lock mechanism. Internal components stay protected. The lock remains in the secured state. Releasing the force allows the lever to return to its normal horizontal position.

All four functions in the L283-601 include a spring-loaded fusible link inside the lock case. In a fire event, this link melts and provides fail-secure mode, ensuring the latch remains engaged even if the case interior reaches elevated temperature. Anti-friction tongue in the latchbolt reduces wear at the strike engagement point over the service life of the lock.

SecurityParts stocks OEM Schlage L Series Vandlgard lock cases and mortise lock parts. Free shipping on orders over $450.