Overview

The Attwood Marine ST13-10-5 is a stainless gas spring hatch support with a 15.00 inch extended length, a 9.50 inch compressed length, and a 10 lb output force. It uses a 6mm rod x 15mm cylinder body and 10mm socket end fittings, so it is a direct replacement only when those measurements match the support already fitted to the boat.

This type of support is used to hold up lighter hatches and compartment lids without needing a manual prop. The stainless shell and rod, together with composite end fittings, make it a sensible choice around deck hatches, lockers, and other wet areas where corrosion is part of normal use.

For replacement work, the important checks are extended length, compressed length, stroke, end fitting style, and force rating. Matching all of those points helps the hatch open to the right angle and stay supported without putting extra load on hinges or brackets.

Key features

• 15.00 inch extended length and 9.50 inch compressed length for hatch and lid setups that match this geometry
• 10 lb output force suited to lighter hatch and compartment lid applications
• 10mm socket end fittings for installations that use matching ball stud hardware
• 6mm rod x 15mm cylinder size in Attwood's Stainless Standard gas spring range
• Stainless steel shell and rod with composite end fittings that stand up better in wet marine spaces

Compatibility and fit

This support is a match when the existing spring on the boat uses the same 15.00 inch open length, 9.50 inch closed length, 5.50 inch stroke, and 10mm socket ends. On hatch supports, small differences in length or socket style can change opening angle and closing load more than most owners expect.

It is a good fit for owners replacing a worn gas spring on a deck hatch, access lid, or storage compartment where the original support matches this size and force class. If the hatch uses two supports, check both sides before ordering so the lid does not end up lifting unevenly.

Installation and setup

Before ordering, compare the old support end to end and confirm the socket hardware on the boat is the same 10mm style. Length, force, and end fittings matter more than the outside appearance, especially on boats where bracket placement is tight and hatch travel is limited.

For a clean replacement, match the new support to the existing mounting points rather than trying to make a near size work. That keeps the hatch movement predictable and helps avoid a lid that opens too far, will not stay open, or becomes hard to close.