#10 Envelopes

#10 Envelopes

#10 Envelopes (Standard 4 1/8" x 9 1/2")

The #10 Envelope is the universal standard for US business mail. Sized exactly at 4 1/8" x 9 1/2", these envelopes are engineered to fit 8.5" x 11" documents folded in thirds. Browse our selection of 10 envelopes below, featuring various window placements, security tints, and sealing options for every office need.

Standard 10 Envelope with Security Tint

1. Security vs. Regular

Choose Security 10 Envelopes with interior blue/black tint to hide confidential data (checks/SSNs). Choose Regular (White Wove) for standard letters and marketing.

Browse Security Options
Peel and Seal 10 Envelope

2. Peel & Seal vs. Gum

Peel & Seal 10 Envelopes feature a self-adhesive strip for manual mailing (no moisture). Gum Seal is the standard lick-and-stick option for machine insertion.

Browse Sealing Options
Double Window 10 Envelope for Checks

3. Window vs. Double Window

Standard Window: Best for invoices/letters with one address. Double Window 10 Envelopes are specifically aligned for checks (QuickBooks compatible).

Browse Window Options

Standard #10 Envelope Specs for Automation

Buying 10 envelopes for automatic insertion? Our standard gummed envelopes are engineered to meet USPS "Machinable Letter" standards, preventing jams in Pitney Bowes and Neopost inserters.

  • Throat Depth: Standard commercial flap depth for high-speed insertion.
  • Paper Weight: 24lb White Wove (Laser Safe) is the industry standard for 10 envelopes.
  • USPS Dimensions: 4.125" x 9.5" aspect ratio qualifies for automation postage rates.

#10 Envelope Technical Specifications

Dimensions 4 1/8" Height x 9 1/2" Width
Document Size Fits 8.5" x 11" Paper (Folded in Thirds)
Flap Style Commercial Flap (V-Shape or Straight)
Max Thickness Standard 1/4 inch (approx 5 sheets)

Manufactured in the USA | Shipped Nationwide

Granite Woods Printing manufactures high-quality 10 envelopes at our facility in Evanston, IL. By printing locally, we ensure consistent paper stock, precise window placement, and fast ground shipping to all 50 states.

Need a logo added? We also offer full customization. Contact us for a quote.

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The Anatomy of a #10 Envelope

While they all share the same 4-1/8" x 9-1/2" dimensions, the construction of the envelope determines its best use. Understanding these technical details ensures you order the right product for your specific equipment and needs.

1. Commercial vs. Square Flap

The Commercial Flap is the standard V-shaped flap. It is designed for high-speed automatic inserting machines used by large mail houses. The Square Flap offers a more contemporary, elegant look, often used for invitations or premium direct mail.

2. Diagonal vs. Side Seams

Most #10 envelopes feature Diagonal Seams (the paper overlaps in a V-shape on the back). However, for heavy graphics or full-bleed printing, we recommend Side Seam construction, which provides a larger uninterrupted printable area on the back.

3. Standard Window Positions

Our #10 Window Envelopes use the industry-standard position (typically 7/8" from the left and 1/2" from the bottom). This ensures compatibility with most accounting software layouts and meets regulations for USPS Machinable Letter standards.

Frequently Asked Questions

What are the exact dimensions of a #10 envelope?
A standard #10 envelope measures exactly 4-1/8 inches high by 9-1/2 inches wide (4.125" x 9.5"). This size is specifically engineered to accommodate standard 8.5" x 11" letter paper folded into thirds.
What is the difference between a #10 and a #9 envelope?
A #10 envelope (4-1/8" x 9-1/2") is the outer mailing envelope. A #9 envelope is slightly smaller (3-7/8" x 8-7/8") and is designed to fit inside a #10 envelope. Businesses typically include a #9 envelope as a "Business Reply Envelope" (BRE) for customers to return checks or payments.
Can I print on the back of the envelope?
Yes. We offer full-color printing on both the front and back of our #10 envelopes. However, please note that printing over the seams (where the paper overlaps) can sometimes result in ink variations. For complex back-flap designs, we recommend choosing our Side Seam envelopes to provide a smoother printing surface.
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