Whitecap 20" Gas Spring - 90lb - Black Nitrate

The Whitecap 20" Gas Spring - 90lb - Black Nitrate (Model G-3490C) is a heavy-duty pneumatic support strut designed for marine, automotive, and equipment applications requiring reliable load assistance and controlled closure. Gas springs deliver smooth, consistent force throughout their stroke, making them ideal for hatches, tonneau covers, truck bed covers, engine compartment lids, and any hinged enclosure that benefits from hands-free or assisted operation. The 90-pound force rating positions this unit in the mid-to-heavy range, suitable for components weighing 40–80 pounds depending on mounting geometry and leverage.

This gas spring features an 8mm rod diameter and 18mm tube diameter in black nitrate finish, engineered to resist corrosion and withstand marine and outdoor environments. Extended length measures 20 inches with a compressed length of 12 inches, providing an 8-inch stroke range. The black nitrate coating offers both aesthetic integration and protective durability against salt spray, moisture, and UV exposure. The sealed, pressurized design ensures consistent 90-pound force delivery across the full stroke, eliminating the performance fade common in mechanical springs and delivering predictable, repeatable operation over thousands of cycles.

Installers should verify mounting hole spacing and load requirements before installation to ensure the 90-pound force aligns with application demands. The 20-inch extended length suits medium-span lids and covers; measure from pivot point to attachment location to confirm fit. Gas springs are typically installed with the rod end downward on vertical or near-vertical applications to optimize performance and extend service life. This Whitecap model is compatible with standard spherical or clevis rod-end fittings and universal tube-mount brackets commonly found in marine hardware and aftermarket automotive suppliers.