36 inch 300lb Gas Struts SF360M300 - Heavy-Duty Lift Support

In this review of the 36 inch 300lb Gas Struts SF360M300 pair, the bottom line is simple: these are heavy-duty lift supports for DIYers who need powerful, weather-tough gas springs for tonneau covers, camper hatches and similar lids. The most compelling reason to buy is the raw force - each strut is rated at 1334 N (about 300 lbs) and comes in a matched pair, so it is designed to handle heavy panels that are more than 72 in side length and weigh roughly 240-330 lbs per strut application.

Key Features

• Force and size: Each strut provides 1334 N (300 lb) of lift across a 36 in extended length, giving consistent, high-force support for heavy lids.
• Matched pair: The set includes two identical gas struts so that both sides of a cover operate with balanced lift and predictable motion.
• Corrosion resistance: Constructed from stainless steel and corrosion-resistant materials to endure outdoor use and harsh weather conditions.
• 13 mm end fit: The 13 mm ball stud termination simplifies installation on common brackets and makes the strut compatible with standard ball-style mounts.
• Wide temperature tolerance: Rated for very low temperatures, the struts are claimed to remain functional in conditions down to around minus 104F, suitable for cold climates.
• Installation support: The package includes an installation guide and access to 12 months of customer support for fitment questions.

Who It's For

This product is aimed at vehicle owners, RV and camper DIYers, and workshop installers who need a robust, high-force pair of gas springs for heavy tonneau covers, floor hatches, trap doors, shell toppers and camper kitchen lids. It suits projects where a long 36 in stroke and a strong lifting force are required to lift and hold heavy panels reliably.

Those who should look elsewhere include users with light lids under about 240 lbs per strut, or applications needing shorter struts, different end fittings, or softer lift characteristics. Also check exact mounting dimensions before purchase if a 13 mm ball stud end is not compatible with your brackets.

Pros & Cons

Pros

• High lift force and long stroke provide confident support for heavy lids and covers.
• Stainless, corrosion-resistant construction improves longevity in outdoor or marine environments.
• Comes as a matched pair with installation guide and accessible customer support.
• Fits standard 13 mm ball studs for straightforward replacement or retrofit.

Cons

• Some users report retaining clip quality and occasional early loss of strength, so longevity may vary by use and installation.
• The struts are very strong and cannot be compressed by hand, making installation require tools and care.

Specifications

Our Verdict

The SF360M300 36 in 300 lb gas strut pair is a practical, heavy-duty option for anyone retrofitting or repairing large tonneau covers, hatches and RV lids. Its high lift capacity, matched pair design and corrosion-resistant build make it a sensible value for demanding outdoor use, though buyers should confirm fitment and be aware of reported retaining clip and longevity concerns.

Frequently Asked Questions

Will these fit my 72 in lid?
They are intended for lids with side length greater than 72 in and a project weight roughly 240-330 lbs per strut; measure mounting points and confirm ball-stud compatibility.

Are the ends standard?
The struts terminate in a 13 mm ball stud fit, which matches common ball-style brackets but should be checked against your existing mounts.

Can I install them myself?
Yes, they are designed for DIY installation and include a guide, but because they are very strong you will need basic tools and a safe method to support the lid during fitment.