A gas spring uses compressed nitrogen inside a sealed cylinder to produce an outward force that helps lift and support a hood, hatch, or other panel. Internal oil lubricates the seals and, depending on the design, helps cushion movement near the end of the stroke. A gas spring reduces lifting effort, but it does not turn a manually operated hood into a powered opening system.
When choosing a replacement from the BDFHYK gas spring and lift support collection, match the application, dimensions, force rating, and mounting connections. For a 2015–2020 Ford F-150, confirm the exact hood-support application before ordering; a similar-looking strut or a listing for another F-150 generation does not establish compatibility.
How Does a Gas Spring Work?
Compressed Nitrogen Creates Extension Force
A typical compression gas spring contains a pressure tube, a piston, a piston rod, seals, and end fittings. Nitrogen pressure acts on both sides of the piston. Because the rod occupies part of the area on one side, the effective areas differ, producing a net force that pushes the rod outward.
Ignoring friction, the extension force is approximately the internal gauge pressure multiplied by the piston rod’s cross-sectional area. As the rod moves into the cylinder, it reduces the available gas volume, increasing pressure and resistance to compression.
Oil Provides Lubrication and Damping
The oil inside the cylinder helps lubricate the seals and moving surfaces. In designs with hydraulic end damping, the piston encounters oil near the end of extension, slowing movement. Damping behavior depends on the internal construction and installation orientation.
Mounting Geometry Determines Lifting Assistance
The force printed on a gas spring is its axial force, not the weight of the hood it can support. Actual lifting assistance depends on the panel weight, hinge position, mounting angle, and distance between the hinge and attachment points.
For more application examples, read what a gas spring does and where it is used.
Compatibility: 2015–2020 Ford F-150 Hood Supports
Do not select a hood support by engine size alone. Confirm the vehicle year, trim, hood configuration, original part reference, and mounting arrangement against the replacement product listing. Treat Raptor fitment and any aftermarket hood or bracket configuration as separate checks.
| Fitment Check | What to Confirm |
|---|---|
| Vehicle application | The product listing explicitly covers the exact model year and hood-support application. |
| Trim and hood configuration | Any trim exclusions, aftermarket hood changes, or bracket differences have been checked. |
| Replacement or conversion | A replacement strut matches the existing system; a conversion kit includes application-specific brackets and instructions. |
| Original part reference | The original support’s part number is cross-referenced where available. |
| Length and travel | Extended length, compressed length, and stroke suit the full hood movement. |
| Force and mounting ends | The required force, sockets, studs, and mounting geometry match the application. |
Fitment note: This guide explains operation and selection. It does not establish a specific BDFHYK part number as a direct-fit replacement for the 2015–2020 Ford F-150.
Specifications to Check Before Buying
Gas springs are not interchangeable simply because their overall appearance is similar. Use the exact product specifications and the original application requirements.
| Specification | What It Means | Why It Matters |
|---|---|---|
| Part number | The identifier for the specific replacement support or kit. | Distinguishes products with different dimensions, force ratings, or applications. |
| Extended length | The length at full extension, measured using the manufacturer’s reference points. | Must suit the panel’s opening position and mounting locations. |
| Compressed length | The length at full compression. | Must allow the panel to close without the support bottoming out. |
| Stroke | The difference between extended and compressed length. | Determines the available travel. |
| Force rating | The specified extension force, usually shown in newtons or pounds-force. | Too little force may not hold the panel open; excessive force can make closing difficult and overload mounting points. |
| End fittings | The socket, eyelet, or threaded connection at each end. | Must match the mounting hardware and allow the required movement. |
| Operating temperature | The manufacturer’s specified working temperature range. | Temperature affects gas pressure and available lifting force. |
| Mounting torque | The specified tightening value for the actual stud, bracket, or fastener. | Must come from the applicable installation instructions or vehicle service information. |
Examples of Specification-Based BDFHYK Gas Springs
For camper shells, toolboxes, and similar panels, BDFHYK lists options such as 17-inch 60 lb / 267 N gas struts and 18-inch 100 lb / 445 N gas struts. These are specification-based examples, not confirmed F-150 hood replacements. Compare all required dimensions, mounting details, and force requirements before choosing either product.
Installation Overview
The following overview applies to replacing conventional ball-socket lift supports after fitment has been confirmed. A bracket conversion kit or a different connection type requires its own installation instructions.
- Secure the panel. Open the hood or hatch and support it with a suitable independent support. Do not rely on a worn gas spring or the remaining strut while removing a support.
- Compare the replacement. Check the part reference, extended length, force rating, end fittings, and installation orientation against the original and the product instructions.
- Release the original support. Follow the instructions for its retaining clips or locking mechanism. Avoid damaging the ball studs, sockets, and clips.
- Inspect the mounting points. Check brackets, studs, and hinges for looseness, corrosion, or deformation. Do not remove hood hinge bolts unless the application-specific procedure requires it.
- Install the replacement. Follow the specified orientation and engage each connection fully. Many conventional gas springs benefit from a rod-down orientation, but the product and vehicle instructions determine the correct position.
- Check mounting hardware. If threaded hardware has been disturbed, tighten it to the specification for that exact connection. Do not assume a universal torque value from thread size alone.
- Verify operation. Confirm that the retainers are secure before carefully removing the temporary support. Move the panel slowly through its travel and check for interference, binding, secure open-position support, and correct latching.
For additional preparation and replacement guidance, see the BDFHYK gas spring installation guide.
Safety and Common Mistakes
- Do not open a pressurized cylinder. Never puncture, heat, cut, or attempt to disassemble a sealed automotive gas spring.
- Protect the piston rod. Scratches, bending, and contamination can damage the sealing surfaces.
- Do not choose a stronger strut as an automatic upgrade. The correct force depends on the panel and its mounting geometry.
- Do not force the panel closed. Binding or excessive resistance may indicate incorrect length, orientation, fittings, or force.
- Check paired supports together. Where two supports are fitted, follow the manufacturer’s replacement guidance and use a matched specification.
- Distinguish removal from pressure release. Detaching a socket from a ball stud does not require venting the cylinder.
For retaining-clip removal and the distinction between detaching a support and releasing internal pressure, read how to release a gas spring safely.
FAQ
Q: How does a gas spring work?
A: Compressed nitrogen produces an outward force on the piston rod. This force assists panel movement, while internal flow restrictions and oil can help control motion. The amount of assistance depends on both the gas spring and its mounting geometry.
Q: Will any BDFHYK gas spring fit a 2015–2020 Ford F-150?
A: No. Confirm an explicit application match or obtain fitment confirmation for the exact product. Universal gas struts for camper shells or toolboxes should not be assumed to fit the truck’s hood.
Q: Can a gas spring listed for one F-150 generation fit another?
A: Do not assume compatibility across generations. Compare the listed vehicle application, original part reference, dimensions, force rating, and mounting connections before installation.
Q: How long does a gas spring last?
A: There is no single service-life figure that applies to every gas spring. Usage, temperature, corrosion, rod condition, seal wear, and loading affect performance. If the panel no longer stays open reliably, support it independently and inspect the system. Read more about gas spring service life and replacement signs.
Q: Why does a gas spring feel weaker in cold weather?
A: Lower temperature reduces the pressure of the gas inside the cylinder, reducing lifting assistance. A panel that will not remain open safely needs independent support and inspection, even if the behavior improves in warmer conditions.
Q: Do the ball studs require an exact torque?
A: Yes, when installing or tightening threaded ball studs, use the value specified for the exact hardware and mounting location. There is no universal torque specification for all gas spring installations.
Q: Can I refill a weak automotive gas spring?
A: Conventional sealed automotive lift supports are replaced when worn or damaged. Do not drill, vent, or attempt to recharge them. Serviceable industrial designs are a separate category and require their manufacturer’s procedures.
