Naval and Defense Applications
Low-permeability 316L lift support for hatches, equipment panels, and access covers on platforms where magnetic signature, corrosion, and vibration all govern the specification.
- 1 The Hatch on a Ship Built to Be Magnetically Invisible
- 2 Four Naval and Defense Applications That Drive the Spec
- 3 Single Spring or Paired on Naval Equipment
- 4 Material Choice and When to Add a Locking Function
- 5 Specifying Non-Magnetic Gas Springs for Naval and Defense
- 6 Why Temperature Swing Changes the Force at Sea
- 7 Why Defense OEMs Source Non-Magnetic Gas Springs for Naval and Defense from Newtone
- 8 Frequently Asked Questions
- 9 Conclusion
- 10 Get a Specification or Quote
The Hatch on a Ship Built to Be Magnetically Invisible
Non-magnetic gas springs for naval and defense applications exist because some platforms are engineered to carry as little magnetic signature as physically possible. A mine countermeasure vessel is the textbook case: its hull, fittings, and equipment are chosen to avoid the magnetic mass that magnetically-fused threats detect. Drop a standard carbon-steel gas spring into a hatch on that ship and you have added precisely the kind of ferromagnetic part the whole design works to eliminate. The lift job is routine. The reason it needs a special spring is that the material has to respect the platform’s signature, the salt air, and the pounding it takes at sea.
This page is for OEM engineers building naval and defense equipment, and for procurement teams sourcing components for low-signature, marine, or field platforms. The materials science behind the non-magnetic requirement is covered on our non-magnetic gas springs overview, and the broader sector context on our aerospace, rail, defense & marine page. Newtone manufactures in Turkey and exports to more than 60 countries, building to order.
Short answer: a non-magnetic gas spring for naval and defense use is built around 316L for low magnetic permeability and salt-air corrosion resistance, with the whole assembly reviewed. Compliance with any specific defense standard belongs to the platform’s test programme — the build supports it, it does not replace it.
The need appears wherever a moving panel sits on a platform that manages its magnetic signature or fights a hard environment. Each case combines an ordinary lift with a demanding set of constraints.
Low-Signature Vessel Hatches
Hatches and access panels on mine countermeasure and signature-managed vessels. The non-magnetic requirement is the whole point here — every ferromagnetic part added to the platform works against its signature budget.
Sensitive Equipment Enclosures
Covers on shipborne sensors, navigation, and detection equipment where a nearby magnetic mass can bias a reading. Material compatibility is specified alongside the motion, not after it.
Topside & Deck Access Covers
Panels exposed to salt spray, weather, and constant cycling. Here corrosion resistance leads the spec — a 316L build resists the pitting that compromises a standard spring’s seals at sea.
Field & Vehicle Equipment Panels
Access panels on defense vehicles and field equipment facing temperature extremes and vibration. Force has to stay consistent from Arctic to desert, and the spring has to survive the shock loading of a moving platform.
Decide by panel weight and width. A single spring suits lighter access covers; pairing keeps a heavier hatch even and twist-free under load — and on a low-signature platform, both springs and every fitting must be non-magnetic.
⬤ Single Spring Setup
- Panel under ~10 kg (22 lb)
- Narrow, centered, rigid cover
- Equipment enclosures, small hatches
- Centered hinge, no lateral pull
- Fewer parts to qualify as non-magnetic
⬤ Paired Spring Setup
- Heavier deck hatches and wide panels
- Even load needed under platform motion
- Load above ~10 kg (22 lb) or offset hinge
- Both springs 316L and non-magnetic
- Springs force-matched to ±5%, same batch
Material Choice and When to Add a Locking Function
The defining feature is the material set, built around austenitic 316L for low magnetic permeability and the corrosion resistance a marine environment demands. Two further decisions complete the spec.
316L for Signature and Salt Air Together
Austenitic 316L answers two naval requirements at once: low magnetic permeability for signature management, and strong corrosion resistance for salt-air service. It shares the family of our stainless steel gas springs, but a signature-managed platform needs the rod, piston, and fittings reviewed for permeability too — not just the body. Where corrosion resistance is the goal but magnetic signature is not a concern, a standard stainless build may suffice; the two requirements should be assessed separately. For documentation to support a programme’s qualification, see our certificates.
Locking Sections for Hold-Open Under Motion
On a moving platform, a hatch that must stay open for access or maintenance cannot be left to drift as the vessel rolls. A locking gas spring adds a mechanical hold — built non-magnetic to match the signature requirement. An end-lock holds at full extension for hold-open; a lock-anywhere unit holds at any point for positioning. The release method depends on the equipment and the operator’s reach, so confirm the locking type with the non-magnetic build together at the design stage.
| Property | Specification |
|---|---|
| Body & rod material | Austenitic stainless steel (316L), low permeability, salt-air resistant |
| End fittings | Non-magnetic eyelet, ball joint, or fork — reviewed as part of the assembly |
| Force range | 50–2000 N (11–450 lbf); naval typical 80–600 N (18–135 lbf) |
| Force tolerance | ±5% (tighter than ±10–15% commodity supply) |
| Operating temperature | −40°C to +100°C (−40°F to +212°F) — size at deployment temperature |
| Seals | HNBR (UV and ozone resistant) as standard |
| Standard compliance | Programme-dependent — belongs to the platform’s test regime |
| Supply | OEM & aftermarket from the same platform, batch traceability |
Why Temperature Swing Changes the Force at Sea
A naval or defense platform deploys across a wider temperature range than almost any other application, and gas spring force tracks temperature. The internal gas pressure rises and falls with temperature, so a panel sized on a temperate quayside delivers a different force in Arctic or tropical service. Size for the deployment temperature, not the bench.
- FT — force at operating temperature T, N (lbf)
- F20 — rated force at +20°C, N (lbf)
- 0.003 — ≈0.3% force change per °C
- T — operating temperature, °C (rooted in Gay-Lussac: P ∝ T at constant volume)
Worked example. Take a hatch spring rated F20 = 400 N (90 lbf) at +20°C. Deploy to the Arctic at T = −30°C: FT = 400 × [1 + 0.003 × (−30 − 20)] = 400 × [1 + 0.003 × (−50)] = 400 × 0.85 = 340 N (76 lbf). The same hatch in a hot engine space or tropical deck at +60°C: FT = 400 × [1 + 0.003 × 40] = 400 × 1.12 = 448 N (101 lbf). That is a swing of 108 N (24 lbf) — from 340 N to 448 N — on one spring across its service envelope, enough to take a hatch from “holds fine” to “feels heavy” or “flies open.” Specify so the panel still holds at the cold extreme, where force is lowest, and stays manageable at the hot extreme. Share the deployment range and we’ll size the gas spring and the mounting bracket for the whole envelope.
Mounting has to survive the platform, not just the panel. Fit the spring with the rod pointing down when the hatch is closed so oil stays at the seals and damping holds under vibration. Keep both pivots in the same plane of motion — gas springs take axial load only, and the shock and roll of a moving platform punish a side-loaded rod. And confirm every fitting and bracket is non-ferromagnetic; one steel part defeats the signature work, as set out on our non-magnetic gas springs overview.
We manufacture in our own facility in Turkey, so material sourcing, tolerances, and lead times stay under our control — exactly what a low-signature, low-volume, custom programme needs.
Frequently Asked Questions
Certain naval platforms are built to keep their magnetic signature as low as possible — mine countermeasure vessels being the clearest example — because a ferromagnetic mass can be detected or can trigger magnetically-fused threats. A standard carbon-steel gas spring adds exactly that kind of mass to a hatch or panel. A non-magnetic gas spring built from austenitic 316L has very low magnetic permeability, so it supports the panel without adding to the platform’s magnetic signature. Final suitability always belongs to the platform’s own signature management programme.
Certification to a defense standard belongs to a test programme, not to a component bought off a shelf. A 316L non-magnetic gas spring provides the material properties a low-signature or environmental requirement calls for, but whether it meets a particular standard depends on the test regime it is evaluated against. Newtone supplies the material specification, tolerances, and documentation to support that programme and routes standard-specific questions to its engineering team rather than claiming a blanket certification.
Salt air and humidity attack a standard steel gas spring faster than the equipment around it, so a 316L stainless build is preferred for naval use both for corrosion resistance and low magnetic permeability. Temperature also matters: gas spring force changes about 0.3% per °C, so a panel sized for a temperate deck can feel different in Arctic or tropical service. Size at the actual operating temperature and specify stainless for the salt-air exposure.
Mount it with the rod pointing down in the closed position so oil keeps the seals lubricated and damping stays consistent under vibration. Keep both pivots in the same plane of motion to avoid side load, which shortens life on a moving platform, and use non-magnetic end fittings that allow slight angular misalignment. Confirm every fitting and bracket in the chain is also non-ferromagnetic, since a single steel part undermines a low-signature design.
Almost always. Defense and naval equipment rarely uses catalog dimensions, and the combination of non-magnetic, corrosion-resistant, and shock-and-vibration requirements means force, stroke, rod diameter, and fittings are specified per project. Newtone manufactures across 50–1000 N (11–225 lbf) and supplies both OEM integration and aftermarket replacement from the same platform, with documentation and batch traceability to support a programme.
Conclusion
A non-magnetic gas spring for naval and defense use is a material decision driven by three demands at once: a low magnetic signature, resistance to salt air, and survival under the shock and temperature swing of a deployed platform. The lift itself is ordinary; what makes the part specialised is that it has to satisfy all three without becoming the weak link in any of them.
The mistakes that recur are predictable: protecting the signature with a 316L body while leaving a ferromagnetic fitting in the chain, and sizing the force at a temperate bench instead of the deployment range. Both are avoided by specifying the whole assembly around 316L and confirming force across the full operating temperature — with compliance to any specific standard handled by the platform’s own test programme.
Newtone builds non-magnetic gas springs to order in 316L, with documentation, batch traceability, and engineering support to feed a programme’s qualification. Share your application, deployment range, and signature requirement, and we will recommend a configuration — typically within 5 business hours.
Get a Specification or Quote
Tell us your platform, panel weight, deployment temperature range, and the signature or environmental requirement. Our engineering team handles material selection, force calculation, and a configuration that fits.
