Custom Fiberglass & Plastic Locking Boxes Built for Your Application

Arrowhead Plastic Engineering designs and manufactures durable fiberglass and plastic locking containers for industrial, commercial, municipal, agricultural, and OEM applications. From weather-resistant dock boxes to custom equipment storage and secure package lockers, we engineer enclosures that protect what matters.

Custom Plastic and Fiberglass Lock Box, Square

Proven Locking Box Designs.
Custom Manufacturing Capabilities.

Rather than starting from scratch, Arrowhead has decades of experience producing molded fiberglass and thermoplastic locking containers for customers across multiple industries.

Whether you need a secure outdoor storage enclosure, truck-mounted storage box, equipment locker, or a completely custom design, our engineering team can adapt proven designs or develop a new solution around your requirements.

Built for Real-World Applications

Industrial & Fleet Storage

  • Truck-mounted storage
  • Chemicals
  • Fertilizer
  • Equipment
  • Maintenance supplies

Outdoor Storage

  • Dock boxes
  • Park equipment
  • Campgrounds
  • Recreation facilities
  • Municipal storage

Secure Delivery & Package Storage

  • After-hours deliveries
  • Package lockers
  • Commercial receiving
  • Jobsite deliveries

Agricultural & Animal Care

  • Feed storage
  • Seed storage
  • Farm tools
  • Horse trailers
  • Livestock equipment

Recreational Storage

  • Dock boxes
  • Ski equipment
  • Bikes
  • Scooters & Mopeds
  • Jet ski accessories

Wildlife Resistant Storage

  • Garbage containment
  • Campgrounds
  • Cabins
  • National parks
  • Bear-resistant applications

Featured Locking Box Designs

Large Dri-Box™ Fiberglass Clamshell Storage Boxes

Built for demanding outdoor use, these oversized fiberglass clamshell boxes offer secure storage for bulky equipment and supplies. Originally developed for fertilizer storage, they can be adapted for a wide range of industrial, commercial, agricultural, and recreational applications.

Large Dri-Box: 60″ Wide x 40″ Deep x 35″ High

Small Dri-Box™ Plastic Storage Container

The Dri-Box™ is a rugged storage box built for trucks, trailers, and commercial vehicles. Its clamshell design makes loading easy, while gas struts hold the lid open during use.

A weather-tight seal, stainless steel hardware, and lockable latch help protect tools, supplies, and equipment from the elements. Available in fiberglass or TPO plastic, the Dri-Box is a dependable storage solution for landscaping, agriculture, utilities, and fleet applications.

Small Dri-Box: 36″ Wide x 23″ Deep x 27″ High

Triangle Locking Dock Box

Dock & Recreation Boxes

Arrowhead’s fiberglass dock boxes provide secure outdoor storage wherever protection from weather and theft is important. Built for years of outdoor use, they are ideal for marinas, parks, campgrounds, utility sites, trailers, and recreational facilities.

Available in rectangular, triangular, and ski box styles, these durable enclosures can store tools, feed, safety equipment, life jackets, ropes, and other gear while keeping it clean, dry, and secure.

Rectangular: 50″ Long x 27″ Wide x 33″ High
Triangular: 61″ Back x 46″ Sides x 34″ High
Ski Box: 75″ Long x 23.5″ Wide x 21″ High

Customize Your Containers

We Can Build

  • Fiberglass locking boxes
  • Plastic locking boxes
  • Large equipment enclosures
  • Truck-mounted storage
  • Custom molded containers
  • Dock boxes
  • Utility boxes
  • Delivery lockers
  • Specialty storage products

Customization Options

  • Size
  • Material
  • Color
  • Hardware
  • Locking mechanisms
  • Mounting features
  • Internal organization
  • Logos
  • Gel coat colors
  • Branding panels

Why Work with Arrowhead?

50+ Years of Manufacturing Experience

50+ Years of Manufacturing Experience

Custom Production
Solutions

Custom Production
Solutions

Prototype to Production Support

Off-The-Shelf Capabilities

U.S.-Based Manufacturing

U.S.-Based
Manufacturing

Need a Secure Storage Solution?

Whether you need a proven locking box design or a completely custom fiberglass or plastic enclosure, Arrowhead Plastic Engineering can help you develop a durable storage solution built for your application.

Frequently Asked Questions About Arrowhead Locking Containers and Boxes

What types of locking boxes does Arrowhead manufacture?

Arrowhead manufactures custom fiberglass and plastic locking boxes for a wide range of applications. Our proven designs include truck-mounted storage boxes, dock boxes, utility boxes, equipment storage, delivery boxes, and custom enclosures built to meet your exact requirements.

Yes. We can modify an existing design or engineer a completely custom locking box based on your size, capacity, mounting, and performance requirements.

We manufacture locking boxes in fiberglass and thermoplastic materials, including TPO. Our engineering team can recommend the best material based on your application, environment, and durability requirements.

Yes. Our locking boxes are designed for outdoor use and feature weather-resistant materials, durable construction, and seals that help protect the contents from rain, dirt, and the elements.

Absolutely. Our boxes are designed with secure locking mechanisms that accommodate padlocks or other locking hardware, helping protect tools, equipment, supplies, and other valuable contents.

Our locking boxes are used across many industries, including landscaping, agriculture, utilities, municipalities, construction, transportation, marinas, parks and recreation, fleet management, and commercial facilities. They can also be adapted for recreational and residential applications.

Yes. Many of our locking boxes are designed for truck, trailer, and fleet applications. We can also engineer mounting features for specialized equipment or custom installations.

Yes. Custom colors are available, and many of our boxes include large, smooth surfaces that are ideal for decals, logos, or molded branding.

Yes. Depending on the application, we can incorporate dividers, mounting brackets, inserts, compartments, or other custom interior features to better organize and protect your equipment.

Yes. Arrowhead works with OEMs to develop proprietary storage boxes and enclosures for commercial products, vehicles, and equipment. We support projects from concept and prototyping through full-scale production.

Yes. Many of our products were developed for a specific customer but have proven to be highly adaptable. They can be used for tool storage, feed storage, package delivery, outdoor equipment, recreational gear, commercial supplies, and many other applications.

Minimum order quantities vary depending on the product and whether an existing mold can be used or a new tool is required. Contact us to discuss your project, and we’ll recommend the most cost-effective manufacturing approach.