The Hongdian 1850 and 1851 replacement nib units feature a stainless steel #5 nib pre-assembled with a plastic feed and threaded housing, designed as direct screw-in replacements for the Hongdian "Forest" fountain pen series. Each nib is stamped with the "HD" logo, intricate scrollwork, and its designated tip size designation.

Technical Specifications

• Nib Material: Stainless Steel

• Nib Size Format: Standard #5 (often referred to internally as a Hongdian size 26 nib unit)

• Tip Widths: Extra Fine (EF) at approximately 0.4mm, and Fine (F) at approximately 0.5mm

• Construction: Friction-fit metal nib and ribbed plastic feed securely housed in a threaded plastic collar for mess-free swapping

• Compatibility: Hongdian 1850 (Black Forest), 1851, 1861, M1, M2, 1843, 6013, 517D, 517S, 525, and 920 series fountain pens