The Schlage L283-615 is the OEM screw pack for the Schlage L Series mortise lock lever trim, containing three L583-902 set screws and one Allen key. The L583-902 set screw is the lever retention fastener used across the LV (lever) lock case assembly family -it secures the lever to the trim hub and prevents the lever from being pulled off the spindle under normal operation or forced entry attempts. The pack ships with three set screws and the hex key required to drive them.

This screw pack is compatible with 33 L Series functions documented in the Schlage L Series Service Manual, spanning the full range of mechanical, electrified, and LM 3-point lock case assemblies:

L9040, L9044, L9050, L9056, L9060, L9070, L9071, L9076, L9077, L9080, L9081, L9110, L9453, L9456, L9457, L9458, L9480, L9485, L9486, L9496, L9090, L9091, L9092, L9093, L9095, L9492, L9493, L9494, L9495, LM9350, LM9370, LM9371, and LM9380.

Schlage L Series Lever Set Screws: What the L583-902 Does

In the L Series lever trim assembly, the lever is installed by pressing it onto the hub until fully seated, then tightening the set screw to lock the lever in position. The set screw drives into a socket on the lever hub through a hole in the lever housing, and the tightened screw prevents lateral movement or pullout of the lever from the hub. Without the set screw correctly seated and torqued, the lever can develop play at the hub, eventually working loose enough to spin freely or detach, which eliminates the lever's ability to retract the latch bolt and creates a security failure.

The Allen key included in the L283-615 pack matches the hex socket drive on the L583-902 set screw. Having the correct driver on hand matters because the small hex socket on these screws is easily damaged by an incorrect size Allen key. The L Series is installed at institutional volumes -the L283-615 pack with three screws and the correct key supports a complete installation (inside and outside levers) with one spare.

Schlage Mortise Lock Parts: LV Lock Case Assembly vs Standard

The LV designation on the compatible functions identifies the lever version of the L Series lock case, as opposed to the SK1 (knob) version. The L Series is offered in both knob and lever trim configurations for the same lock functions. The L283-615 set screw pack covers the LV lever lock cases specifically -the screw geometry and retention approach for knob trim uses a different fastener.

The LV lock case assembly is the current standard for most L Series commercial specifications. Lever trim is required by ADA for accessible hardware in public accommodations and commercial facilities, which is why the LV functions represent the majority of active L Series installations. The L9050, L9070, L9071, L9080, and L9092/L9093 electrified functions -all in the LV configuration -are among the highest-volume L Series functions in the field.

Schlage L283-615 Screw Pack: When You Need It

The L583-902 set screw is most commonly needed as a field replacement in three situations. First, when a lever is removed for cylinder service or trim refinishing -the set screw is small and easily lost during disassembly. Second, when a lever develops wobble on an existing installation indicating the set screw has backed out or stripped, which happens in high-traffic doors where repeated lever impact and vibration can work the screw loose over time. Third, during new installation when additional screws are needed to complete a multi-door project from a single service kit.

All three scenarios apply across the entire range of functions listed above, including the L9090 through L9095 and L9492 through L9495 electrified lever functions and the LM9350 through LM9380 three-point lever lock functions.