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Section 4: Mailbox Hardware

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Introduction

This section presents common information associated with mailbox hardware. The mailbox standards sheets (MB-06(1) and MB-06(2)) contain detailed information about mailbox hardware, DHT numbers, and installation guidelines.

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Types of Supports

There are two general types of mailbox supports and specific hardware associated with each type of support:

  • Single Mailbox Support: Either of these supports can be used to support a single mailbox.
    • Thin-wall steel tube: A 2 to 2½ inch diameter thin-wall steel tube. This type of post can be used with a small, medium, or large sized mailbox
    • Wing channel post: A 2 pound/ft wing channel post. This type of post can be used with a small or medium sized mailbox.
    • Recycle Rubber Post: A rubber post. This type of post is used only for a small size mailbox.
  • Double Mailbox Support: This support is used to support two mailboxes on a single support.
    • Thin wall steel tube: A 2 to 2½ inch diameter thin wall steel tube.
    • Wing channel post: A 2 pound/ft wing channel post.
  • Multiple Support: Either of these supports can be used for three or more mailboxes.
    • Coat hanger support: A 2 inch diameter thin-wall steel tube support frame that has a shape similar to an upside down coat hanger. See Figure 9-8.
    • Constant radius support: A 2 3/8 inch diameter white powder-coated semi-circular pipe with a constant radius. See Figure 9-9.

Coat Hanger Multiple Support (click in image to see full-size image)

Figure 9-8. Coat Hanger Multiple Support

Constant Radius Multiple Support (click in image to see full-size image)

Figure 9-9. Constant Radius Multiple Support

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Types of Foundations

There are six types of foundations. Table 9-2 lists the foundations and indicates which type of foundation is used with each type of support.

Table 9-2: Support and Foundation Combinations

Type of Support

Type of Foundation

V-Loc

Wedge Anchor

Driven

Concrete

Embedded

Temporary

Thin-Wall Steel Tube

Type 1

Type 2

No

No

No

No

Thin-Wall Multiple (coathanger)

Type 1

No

No

No

No

No

Wing Channel

No

No

Type 3

No

No

No

Powdercoat Steel (constant radius)

No

No

No

Type 4

No

No

Recycled Rubber

No

No

No

Type 4

No

No

4 x 4 Wood

No

No

No

No

Type 5

No

Plastic Drum

No

No

No

No

No

Type 6



Figure 9-10 illustrates the orientation of the supports/anchors relative to the direction of traffic. Where a wedge is used, it is installed on the side of the support nearest the direction of traffic.

Orientation of Supports/Anchors for Single/Double Mailbox
Installations (click in image to see full-size image)

Figure 9-10. Orientation of Supports/Anchors for Single/Double Mailbox Installations

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Mailbox Bracket

The TxDOT universal mailbox bracket provides a single bracket that can be used to mount a small, medium, or large mailbox to a single or multiple support. Figure 9-11 illustrates the basic mailbox bracket. The extensions are used only with a medium or large mailbox. Bolts with a 3/8 inch diameter should be used to provide a tighter fit and prevent the mailbox from rocking. Figures 9-12 to 9-15 illustrate the attachment of the bracket to mailbox supports.

Mailbox Bracket (shown upside down) (click in image to see full-size image)

Figure 9-11. Mailbox Bracket (shown upside down)

Attaching the Bracket to a Single Support (click in image to see full-size image)

Figure 9-12. Attaching the Bracket to a Single Support

Use of the Adapter Plate for a Double Mailbox Installation (click in image to see full-size image)

Figure 9-13. Use of the Adapter Plate for a Double Mailbox Installation

Attaching the Bracket to the Multiple Support (click in image to see full-size image)

Figure 9-14. Attaching the Bracket to the Multiple Support

Bolting the Bracket to a Multiple Support Tube (click in image to see full-size image)

Figure 9-15. Bolting the Bracket to a Multiple Support Tube

The following list of tasks provides step-by-step instructions for putting the bracket together:

  • Attach extension bracket (if required):
    • For a small mailbox, no extension brackets are used.
    • For a medium mailbox, an extension bracket is used on one side only.
    • For a large mailbox, extension brackets are installed on each side.
  • Bolt angle brackets to bottom of mailbox bracket:
    • See Figures 9-12 and 9-13 for orientation with a single or double mailbox support.
    • See Figures 9-14 and 9-15 for orientation with a multiple support.
  • Bolt bracket to mailbox.
  • Bolt assembled bracket/mailbox to support.
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