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  • SECO-LARM SD-211-BD1Q / SD-231-ND1Q — Electro-Mechanical RIM Lock/Latch

    September 08, 2026 2 min read

    Specifications for the SECO-LARM SD-211-BD1Q electro-mechanical RIM lock and SD-231-ND1Q latch — heavy-duty, fail-secure locking for doors and gates.

    Full text manual (for reference)

    Specifications for the SECO-LARM SD-211-BD1Q and SD-231-ND1Q Electro-Mechanical RIM Lock/Latch — a heavy-duty, fail-secure locking device for doors, side gates, and pool gates.

    Overview

    The SECO-LARM electro-mechanical RIM lock/latch offers both door and gate security and user convenience in a heavy-duty package. These devices securely lock doors, side gates, pool gates, and other entrances, and can be unlocked from inside via a built-in electric switch or from outside with the included keys.

    Family Models

    Model Type
    SD-211-BD1Q Electro-Mechanical RIM Lock
    SD-231-ND1Q Electro-Mechanical Latch

    Features

    • 12VDC, fail-secure operation with manual override
    • Fully mechanical, so it can be unlocked if power is lost
    • Unlocks from inside via built-in electric switch
    • Unlocks from outside with included keys
    • Easy to install on existing gates and doors
    • Compatible with nearly all access control devices
    • Use for in-swinging or out-swinging doors
    • 2,250-lb (1,020-kg) static strength

    Specifications

    Spec SD-211-BD1Q SD-231-ND1Q
    Operating voltage 12VDC
    Current draw (standby) 0A @ 12VDC
    Current draw (active) 3A @ 12VDC maximum
    Static strength 2,250-lb (1,020kg)
    Endurance 500,000 cycles (factory tested)
    Operating temperature -40°~122° F (-40°~50° C)
    Lock body dimensions 5 1/8" x 3 15/16" x 1 11/16" (130x100x43 mm)
    Strike body dimensions 1 7/16" x 3 15/16" x 1 5/8" (36x100x41 mm)

    Sample Installation (SD-211-BD1Q)

    The lock body mounts to the door frame with the strike body on the door itself, suitable for either out-swinging or in-swinging gates/doors. The lock is positioned on the outside of the frame with the mating strike on the inside face of the door (or vice versa, depending on swing direction).

    Warranty & Notes

    This SECO-LARM product is warranted against defects in material and workmanship for one (1) year from the date of sale to the original consumer customer. SECO-LARM's policy is one of continual development; specifications and pricing are subject to change without notice, and SECO-LARM is not responsible for misprints.