Vandal Resistant 20”x20” Multipurpose Lock Box
The Vandal Resistant 20”x20” Multipurpose Lock Box is our largest, most heavy-duty enclosure—ideal for housing critical components in transit stations, correctional facilities, and industrial sites. Made in the USA from 12-gauge stainless steel, it features an integrated padlock shroud, conduit access, removable backplate, and is backed by a 10-year vandalism warranty. With nearly four square feet of internal space, this unit offers uncompromising security and capacity for high-risk, high-volume environments.
Warranty Guide, Care Instructions & Spec Sheet - See Spec Sheet Tab Below
When you need maximum internal capacity and maximum protection, the AA-MLB-20x20 delivers. As the largest model in our vandal resistant enclosure line, this multipurpose lock box is engineered for high-security environments where tamper resistance, corrosion protection, and flexible utility are essential. With an internal space of 20” x 20” x 4 ⅜” and a rear opening of 18” x 18”, this enclosure is ideal for critical electrical, communications, or infrastructure protection in public areas, transit systems, or correctional institutions.
Product Features:
- Vandal Resistant Design: Constructed from 12-gauge 304L or optional 316L stainless steel with TIG welds and de-burred edges to resist tampering and abuse.
- Made in the USA: Built to the highest standards using sustainable, LEED-compliant stainless steel.
- 10-Year Vandalism Warranty: Industry-best coverage on 12-gauge models for damage caused by tampering or forced entry.
- Integrated Padlock Shroud: Concealed lock area resists prying, cutting, and bolt cutters.
- Spray & Drip Deflective: Engineered to prevent rain or splash from entering the enclosure.
- Removable Backplate: Facilitates wiring and mounting access during installation while maintaining exterior integrity.
- Surface Mounted: Includes pre-drilled 3/8” holes for wall attachment (anchoring hardware not included).
- Conduit Ready: Supports ½” conduit connections up to 0.8" outside diameter for secure wire routing.
Dimensions & Weight:
- Exterior: 23” W x 20 ½” H x 4 ¾” D
- Interior: 20” W x 20” H x 4 ⅜” D
- Rear Opening: 18” W x 18” H
- Weight: 41.5 lbs
Material & Finish:
Choose from 12-gauge 304L stainless steel or marine-grade 316L for high-humidity or salt-exposed locations. All units are finished in a brushed Satin #4 finish for corrosion resistance and clean aesthetics.
Installation Guidance:
Install using 3/8” stainless steel fasteners appropriate to the wall or partition type (not included). For optimal strength, use back bracing of ¾” or more. Back-to-back through-bolt installation is recommended where applicable.
Warranty:
All 12-gauge models are backed by a 10-year vandalism warranty. If the enclosure is compromised through vandalism during proper use, we will repair or replace it — a level of confidence unmatched in the industry.
Flexible Applications:
The AA-MLB-20x20 provides secure protection for:
- Large-scale electrical and junction systems
- Telecom relay or emergency access equipment
- Lockout/tagout controls and key management
- Transit or correctional system communications
This unit’s large internal space and durable exterior make it an ideal choice when capacity, security, and longevity are essential.
Why Choose Vandal Stop?
Competing lock boxes from manufacturers like Bradley and Bobrick often use 18-gauge material and offer limited protection. Our 12-gauge stainless steel boxes offer over 2.5x the impact strength and are the only models backed by a 10-year warranty against vandalism. When your equipment needs to stay protected — Vandal Stop delivers.