C7/C6 Envelope
C-Series Envelopes (ISO 269) · 7 specs
Direct Answer
The C7/C6 envelope is an ISO 269 hybrid envelope format measuring 81 × 162 mm (3.19 × 6.38 inches). Having the height of a C7 envelope and the width of a C6 envelope, it is engineered specifically to hold an A5 sheet folded in thirds, widely used for confidential payroll slips, dividend checks, and gift vouchers.
Source: ISO 269:1985 (DIN 678) · Last reviewed Aug 28, 2026
Specs
| Width × Height (Metric) | 81 × 162 mm |
| Width × Height (Imperial) | 3.19 × 6.38 in |
| Hybrid Geometry Origin | Height of C7 (81 mm) combined with Width of C6 (162 mm) |
| Target Paper Pairing | A5 paper folded horizontally in thirds (70 × 148 mm) |
| Paper Insertion Clearance | +11 mm height / +14 mm width clearance |
| Common Security Features | Dark opaque blue/black cross-hatch security pattern interior print |
| Primary Applications | Confidential employee salary pay-slips, dividend warrant checks, gift certificates |
Compact Payroll and Voucher Sizing
For documents that originate on compact A5 stationery (such as payroll slips, insurance claim notices, and store gift cards), using a full DL envelope wastes over 35% of paper material. The C7/C6 hybrid envelope (81 × 162 mm) securely encloses an A5 sheet tri-folded into a 70 × 148 mm slip.