Mail Boss 7121 Heavy-duty Square Mailbox Post Black Steel

Product Description

The MAIL BOSS 7121 is a heavy-duty in-ground mailbox post constructed from 10-gauge to 14-gauge galvanized steel with a durable black powder-coated finish. Measuring 43 inches tall by 4 inches wide by 4 inches deep, this post is engineered to position a curbside mailbox within USPS-required mounting height specifications of 41 to 45 inches above the roadside surface. The hollow square profile slides over a standard 4x4 wooden post for deep installations or rebar reinforcement, making it a reliable choice for residential mail delivery setups. Four mounting bolts and installation instructions are included. A limited lifetime warranty backs the product.

The 7121 is suited for residential curbside mailbox installations where a secure, weather-resistant post is required. It is designed for in-ground installation with approximately 12 inches of the post buried below grade to achieve proper mailbox height per USPS guidelines. The ability to sleeve over a 4x4 wooden post or rebar makes it adaptable to varying soil conditions and installation requirements, including areas where additional anchoring is needed for long-term stability.

Key Features

• 10-gauge to 14-gauge galvanized steel construction for corrosion resistance
• Black powder-coated finish for weather durability and clean appearance
• Positions mailbox at USPS-compliant height of 41 to 45 inches above roadside surface
• Hollow square profile fits over a standard 4x4 wooden post or rebar for reinforcement
• Includes 4 mounting bolts and clear installation instructions
• Limited lifetime warranty

Compatibility

Designed as an in-ground mounting post compatible with curbside mailboxes requiring a standard 4-inch square post mount. Fits over a 4x4 wooden post for added reinforcement.

Installation Notes

Bury the post approximately 12 inches below grade to achieve the USPS-required mailbox height of 41 to 45 inches above the roadside surface. Dig the post hole to appropriate depth and diameter before setting the post, and allow concrete or compacted fill to fully cure or settle before mounting the mailbox. Power tools or a standard post-hole digger are typically used for excavation. Follow all local codes regarding right-of-way and utility clearance before digging.

Technical Specifications

• Material: 10-gauge to 14-gauge galvanized steel
• Finish: Black powder coat
• Height: 43 inches
• Width: 4 inches
• Depth: 4 inches
• Weight: 13.4 pounds
• Warranty: Limited lifetime
• UPC: 00660753712102

Standard Information

• Brand: MAIL BOSS
• Manufacturer Part Number: 7121