• T Slot Nut Dimensions
• Typical Mail Slot Dimensions
• Standard Mail Slot Dimensions Chart

Sizes for Letters

There are three standard sizes and two styles of mailboxes: STYLE / SIZE: LENGTH: WIDTH: HEIGHT: T1 and C1: 18 1/2' 5' 6' T2 and C2: 19 1/2' 6' 7' T3 and C3: 22 1/2' 8' 11 1/2' T - Traditional style C - Contemporary style Dimensions reflect the minimum interior size. Section D041 of the Domestic Mail Manual contains additional information about. Made of brass, two (2) piece standard mail slots have a spring-loaded flap for the front of a solid door or wall and inside trim for the rear. Standard mail slots are available in two (2) sizes, letter size and magazine size, and three (3) popular finishes. Standard mail slots may be used for U.S.P.S. Residential door mail delivery.

T Slot Nut Dimensions

You probably have a picture in your mind of what a 'letter' is. Possibly you're using a standard No. 10 envelope for your letter, so that's easy to picture. However, if you decide to create a mailpiece with its own special envelope or if you are designing a piece that will be folded to letter-size, be sure to keep in mind the following size requirements for letters:

1. . Machinability: Size restrictions for First-Class Mail 1 ounce or less; Standard Mail 3.3 ounces or less Machinable Sizes: To meet machinable requirements, the tip of the upper-right corner of the mailpiece must touch this shaded area and meet the thickness standards (check for maximum thickness by passing the piece through the slot below).
2. Salsbury 4000 Series Standard Magazine Size Mail SlotsMagazine size mail slot overall dimensions are 13' W x 3-1/2' H. May be used for U.S.P.S. Residential door mail delivery.
3. Mailbox Size & Installation. These next generation mailboxes can hold multiple packages, plus your regular letters, cards, and magazines. 13.63” wide x 7.75” tall on sides, 12' tall at center x 16.5” deep 2. This mailbox fits on most standard posts.

To be eligible for mailing at the price for letters, a piece must be:

Typical Mail Slot Dimensions

• Rectangular
• At least 3-1/2 inches high x 5 inches long x 0.007 inch thick.
• No more than 6-1/8 inches high x 11-1/2 inches long x 1/4 inch thick.

First-Class Mail letters that have one or more nonmachinable characteristics will pay a nonmachinable surcharge. Customers can be unpleasantly surprised that they must pay extra postage when, for example, they mail a square greeting card. The Postal Service charges extra postage because mailpieces that are rigid, square, or unusually shaped, often jam postal equipment and are difficult to process. This costs the Postal Service time and money—and may also damage your mailpiece.

Many mailers fold sheets of paper to form letter-size pieces or newsletters. Folded pieces, or folded self-mailers, can save time and money because you're not paying for or stuffing envelopes. Folded self-mailers must be sealed or they will be subject to the nonmachinable surcharge. We recommend that you use wafer seals or tabs to close the open sides of folded mailpieces.

Here's some good advice on tabbing: Put the fold on the bottom (the side below the address) and secure the opening at the top with a piece of tape, a tab or a wafer seal.

There are special size requirements for mailing letters at automation prices. Contact your Business Mail Entry Unit for more information.

TIPS

• 0.007 inches? How do I measure that? As a guide, an index card is thick enough. If in doubt, contact a Mailpiece Design Analyst (MDA) near you. MDAs have tools for precisely measuring thickness and can tell you if your mailpiece is thick enough.
• What is high? What is long? Length is the side parallel to the address. Height is the side that is perpendicular to the length.

Standard Mail Slot Dimensions Chart

1. Sizes for parcels that weigh 13 ounces or less.