Oki ML520 Service Manual page 22

Width: 7.2 to 14.3 inches (18.3 to 36.3 centimeters)
Width: Microline 520 7.2 to 8.5 inches (18.2 to 21.5 centimeters)
Microline 521 7.2 to 14.3 inches (18.2 to 36.3 centimeters)
Length: 3 to 17 inches (7.62 to 43.18 centimeters)
Thickness: 0.014 inches (0.325 millimeters) Maximum
Paper Feed Path: Top
Printhead Gap Information:
Envelopes
Weight: 24 lbs. (90 g/m 2 ) Maximum
Size:
Single Feed
Minimum: 6.5 x 3.6 inches (16.5 x 9.1 centimeters)
Maximum: 9.5 x 4.1 inches (24.1 x 10.4 centimeters)
Continuous
Non-overlap type
Thickness: .014 inches (.325 millimeters) Maximum
Paper Feed Path: Bottom
Printhead Gap Information:
Labels
Weight: N/A
Width: Microline 520 3.5 to 10.5 inches (8.8 to 26.6 centimeters)
Microline 521 3.5 to 16.5 inches (8.8 to 41.9 centimeters)
Length: 3 to 17 inches (7.62 to 43.18 centimeters)
Thickness: .011 inches (0.28 mm) Maximum (including backing)
Paper Feed Path: Bottom
Printhead Gap Information:
CAUTION:
Use Bottom Feed and/or optional Pull Tractor for card stock and labels.
Transparency
Refer to the Printhead Gap Information, Section 1.6.
Refer to the Printhead Gap Information, Section 1.6.
Refer to the Printhead Gap Information, Section 1.6.