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Custom Locking Gas Springs Manufacturer in China
Custom Locking Gas Springs Manufacturer in China

In medical and furniture components, the locking gas springs is one of the most important elements. It is also called lockable gas struts, or locking gas shocks, with which users can adjust and securely fix the angle or height of the equipment. In other words, it plays a very significant role in realizing the ultimate comfort and safety benefit for users.

How Locking Gas Springs Work? Locking gas springs work via an internal valve:When the valve is closed, high-pressure gas is trapped so the spring locks firmly in place.When you press the release lever, the valve opens and the gas flows freely, allowing the spring to move and be adjusted to virtually any position.

In the following section, we will detail the specifications of our locking gas springs from a manufacturer’s perspective. Additionally, we will present their structural composition diagrams and manufacturing processes.

Precision-Engineered Locking Gas Springs Types

Depending on the specific design requirements and kinematic layouts of different applications, the mechanical characteristics of locking gas springs vary significantly. GASTAC bypasses standard catalog compromises to provide application-specific internal valving built strictly to your engineering prints.

Elastic Locking

The entire locking stroke operates within a pressurized nitrogen gas column rather than pure oil. When the valve closes, the compressed gas column acts as a deliberate, high-frequency shock absorber while maintaining the preset position.

Rigid Locking in Compression

The internal piston is completely submerged in oil when locked under downward pressure. Under heavy compression loads, it acts as a solid steel rod—completely unyielding.

Rigid Locking in Tension

The internal oil chamber shifts to the opposite side of the piston. When the spring is locked, it provides absolute resistance against outward pulling forces, ensuring the extended stroke cannot be forcefully compressed or deflected.

Locking Gas Spring with Release Button

A standard gas spring integrated with a specialized mechanical locking button mechanism. It automatically drops into a solid mechanical detent to freeze the stroke exclusively at the fully extended or fully compressed end-positions, requiring a manual button press to resume travel.

Gas Strut Safety Lock

Features an external, heavy-duty protective steel shroud or locking sleeve over the piston rod. In the event of sudden internal pressure failure or unexpected overload, the mechanical sleeve automatically mechanical-stops or manually locks to prevent accidental column compression or collapse.

GASTAC Locking Gas Springs

GASTAC’s premium series of locking gas springs is precision-engineered to deliver infinite height, pitch, or angle adjustment combined with unyielding, zero-drift position control.In complex mechanical sub-assemblies, a generic catalog standard is never enough. The true kinematic challenge lies at the mechanical pivots: a few millimeters of valve stroke change at the internal piston translates to degrees or inches of fluid, highly responsive motion on the end application.

How to read the Specifications of Locking Gas Springs

The universal locking gas springs generally have an outer tube with a diameter of Ø28mm and a piston rod with a diameter of 10Ømm (or custom cylinder/rod combinations based on load requirements).The cylinder end and the piston rod end are connected to the driving linkages, pivoting sub-assemblies, or structural frames of your application via customized end fittings.

Locking Gas Spring Measurement
  • Rod Diameter: The thickness of the inner moving steel shaft, which determines the load support strength and prevents the spring from bending under pressure.
  • Body Diameter: The thickness of the outer cylinder housing the internal nitrogen and oil, which dictates the physical space needed to install the spring.
  • Extended Length: The absolute maximum total length when the spring is fully open, which dictates the highest position or angle your equipment can reach.
  • Stroke: The actual functional travel distance the rod moves in and out, where a few millimeters of change translates to degrees of motion on your mechanism.

GASTAC Locking Gas Springs Specifications Range

As a critical component for height adjustment or tilt control, locking gas springs must be robust enough to withstand weight capacities exceeding 2,000 N (200 kg). Therefore, the diameters of both the piston rod and the steel cylinder are of paramount importance. To fulfill diverse market demands for varying load capacities, locking gas springs are categorized into five distinct types:

Rod / Tube Dia. (mm)Stroke Range (mm)Max Extended Length (mm)Rated Force Range (F1)Primary Application Field
10/2220–200100–50050–350NAutomotive Recliners
10/2220–250100–60080–600NSteering Columns, Treatment Tables
10/2630–300150–700100–800NMedical Beds, Specialized Seating
10/2850–400200–1000200–1200NPremium Hospital Furniture, Ergonomic Desks
14/28150–600400–1350150–2000NHeavy Machinery, Industrial Access Hatches

Series of GASTAC Lockings Gas Springs

Depending on the specific requirements of different applications, our locking gas springs are categorized into the following distinct series:

1. HS Series Locking Gas Springs for Hospital Stretchers

For ambulance stretcher OEMs, GASTAC’s HS series locking gas springs for hospital stretchers integrates seamlessly into X-frame chassis and backrest pivots to deliver absolute reliability in the field. The internal rigid hydraulic valve structure ensures zero mechanical drift, allowing stretchers to withstand heavy, high-frequency CPR compressions without yielding. Built for extreme medical environments, each unit features high-grade seals that repel blood and disinfectants while ensuring instantaneous, zero-latency locking responsiveness when it matters most.

GASTAC Part NumberRod / Tube Dia. (mm)Stroke (mm)Extended Length (mm)Force Range (F1)Locking Type
HS060240045010/2260240200N - 450NRigid
HS070250045010/2270250200N - 450NRigid
HS080260045010/2280260200N - 450NRigid
HS090270060010/2290270200N - 450NRigid
HS100315060010/28100315300N - 600NRigid
HS120355065010/28120355350N - 650NRigid
HS130375065010/28130375350N - 650NRigid
HS140395070010/28140395400N - 700NRigid
HS150420070010/28150420400N - 700NRigid
HS180490110014/28180490500N - 1100NRigid
HS200530120014/28200530600N - 1200NRigid
HS220570130014/28220570600N - 1300NRigid

2. HS Series Locking Gas Springs for Overbed Tables

Designed for single-post cantilevered overbed tables, GASTAC’s OT series locking gas springs for overbed tables features an internally reinforced structure that withstands high eccentric forces when patients lean on tabletop edges. A specialized one-way override mechanism allows users to effortlessly lift the tabletop upward without engaging the release lever, while providing instant locking against downward pressure. Fully compatible with mainstream medical columns, this series guarantees zero-drift positioning and smooth height adjustment in an optimized, slim-profile housing.

GASTAC Part NumberRod / Tube Dia. (mm)Stroke (mm)Extended Length (mm)Force Range (F1)Locking Type
OT15037530010/22150375150N - 350NRigid
OT18043535010/22180435150N - 350NRigid
OT20047540010/22200475150N - 350NRigid
OT20051540010/22220515150N - 350NRigid
OT25057545010/22250575150N - 350NRigid
OT28063545010/26280635150N - 350NRigid
OT30067550010/26300675150N - 350NRigid
OT45098060010/28450985150N - 350NRigid

3. PSD Series Locking Gas Springs for Pneumatic Standing Desks

Designed for dual-leg pneumatic desks, GASTAC’s PSD series locking gas springs for pneumatic standing desks synchronized Rigid Locking configurations are fully customized to match your specific OEM twin-telescoping column heights and desktop weight ratings. Built strictly to your engineering prints, these gas springs integrate seamlessly into proprietary dual-column chassis to eliminate side-to-side column binding and vertical sagging under heavy workloads. By micro-matching your exact stroke travel and counterbalance forces, this series ensures perfectly balanced, fluid lifting assist within restricted inner leg envelopes.

GASTAC Part NumberRod / Tube Dia. (mm)Stroke (mm)Extended Length (mm)Force Range (F1)Locking Type
PSD200049060010/28200490300N-600NRigid
PSD250059060010/28250590300N-600NRigid
PSD300069060010/28300690300N-600NRigid
PSD350079060010/28350790300N-600NRigid
PSD400089060010/28400890300N-600NRigid
PSD450099060010/28450990300N-600NRigid
PSD500111060010/285001110300N-600NRigid

4. SDC Series Locking Gas Springs for Standing Desk Converters

Designed for standing desk converters, GASTAC’s SDC Series customized Rigid Locking configurations are built strictly to your prints to match specific OEM scissors-lift leverage ratios and load capacities. Integrating seamlessly with X-frame or Z-lift folding chassis, these high-force gas springs eliminate desktop wobbling and typing flex. By micro-matching your exact travel requirements, this series ensures rock-solid stability and fluid lifting assist while fitting perfectly within ultra-flat, restricted under-surface clearances.

GASTAC Part NumberRod / Tube Dia. (mm)Stroke (mm)Extended Length (mm)Force Range (F1)Locking Type
SDC06020040010/2260200150N - 400NRigid
SDC08024040010/2280240150N - 400NRigid
SDC10028040010/22100280150N - 400NRigid
SDC12032040010/22120320150N - 400NRigid
SDC15038040010/22150380150N - 400NRigid
SDC16040540010/28160405150N - 400NRigid
SDC18044540010/28180445150N - 400NRigid
SDC20048540010/28200485150N - 400NRigid

5. WH Series Locking Gas Springs for Wheelchairs

Designed for tilt-in-space and rehabilitative wheelchairs, GASTAC’s WH series locking gas springs for wheelchairs customized Elastic Locking configurations are built strictly to your prints to match specific OEM frame geometries and tilt angles. Integrating seamlessly with proprietary seating mechanisms, these gas springs eliminate backrest play while utilizing a responsive nitrogen gas-cushion to isolate occupants from road vibrations. By micro-matching your exact travel requirements, this series delivers exceptional hydraulic damping comfort within a highly compact frame envelope.

GASTAC Part NumberRod / Tube Dia. (mm)Stroke (mm)Extended Length (mm)Force Range (F1)Locking Type
WH0201203008/2220120100N - 300NElastic
WH0401603508/2240160100N - 350NElastic
WH0602054008/2260205150N - 400NElastic
WH0802454508/2280245150N - 450NElastic
WH10028560010/22100285200N - 600NElastic
WH12032570010/22120325250N - 700NElastic
WH15039590010/28150395400N - 900NElastic

6. TSW Series Locking Gas Springs for Tractor Tilt Steering Wheels

Designed for agricultural tractors and off-highway cabs, GASTAC’s customized Rigid Locking configurations are built strictly to your prints to match specific OEM chassis layouts and steering column geometries. Integrating seamlessly with heavy-duty steering mechanisms, these gas springs eliminate tilt backlash and wobbling under severe field vibrations. By micro-matching your exact travel requirements, this series ensures rock-solid hydraulic stability while fitting perfectly within restricted dashboard envelopes.

OEM NumberRod / Tube Dia. (mm)Stroke (mm)Extended Length (mm)Force Range (F1)Vehicle Model
8771000310/2850245420 NCase IH / New Holland
AL2222258/2840230330 NJohn Deere
8203601610/2850245420 NCase IH / New Holland
AL2092758/28140205350 NJohn Deere
704381010/2850240420 NPolaris RZR
RE15121710/2870255330 NJohn Deere
RE5022710/2840230330 NJohn Deere
RE1520428/2840230330 NJohn Deere
224357A110/2865355200 NCase IH
704326110/2850240330 NPolaris RZR
8652291410/2855250350 NNew Holland
704409810/2855240350 NPolaris
AL15075510/2840230330 NJohn Deere

7. EW Series Locking Gas Springs for EVA Walkers

Designed for neuro-rehabilitation walkers, GASTAC’s EW series offers a rock-solid 50mm to 150mm stroke range to ensure precise height adjustment for forearm support pads. Integrating seamlessly with telescopic oval tubes, these gas springs utilize rigid hydraulic locking to eliminate sudden sagging and height flex when patients lean heavily for balance. This ensures zero-play stability and secure weight-bearing support within an ultra-slim vertical column profile.

IDRod / Tube Dia. (mm)Stroke (mm)Extended Length (mm)Force Range (F1)Locking Type
EW05019025010/2250190150N - 250NRigid
EW08025040010/2280250200N - 400NRigid
EW10029045010/22100290250N - 450NRigid
EW12033050010/22120330300N - 500NRigid
EW12033560010/28120335400N - 600NRigid
EW15039570010/28150395500N - 700NRigid

8. MB Series Locking Gas Springs for Massage Beds

Designed for professional spa and massage tables, GASTAC’s MB series offers a rock-solid 60mm to 180mm stroke range to ensure unyielding backrest stability under intense downward force. Engineered to maximize rigid hydraulic locking, these locking gas springs for massage beds eliminate all “spongy bouncing” and flexing during heavy bodywork while suppressing fluid-hissing noise. This guarantees quiet adjustment travel and rock-solid support within a compact bedframe profile.

GASTAC Part NumberRod / Tube Dia. (mm)Stroke (mm)Extended Length (mm)Force Range (F1)Locking Type
MB06022040010/2260220150N - 400NRigid
MB08026045010/2280260150N - 450NRigid
MB10031560010/28100315200N - 600NRigid
MB12035570010/28120355250N - 700NRigid
MB15042080010/28150420300N - 800NRigid
MB18048090010/28180480400N - 900NRigid

9. MTS Series Locking Gas Springs for Movie Theater Seats

Designed for commercial cinema seating, GASTAC’s MTS series offers a robust 25mm to 100mm stroke range to deliver smooth backrest pitch adjustment through under-seat linkages. Fully compatible with global VIP cinema ironmongery and motion chassis, these gas springs maximize hydraulic damping to eliminate backrest wobble and sagging under heavy public use. This ensures highly responsive counter-balance stability within an exceptionally compact under-seat footprint.

GASTAC Part NumberRod / Tube Dia. (mm)Stroke (mm)Extended Length (mm)Force Range (F1)Locking Type
MTS0251856008/2225185100N - 600NElastic
MTS0301956008/2230195100N - 600NElastic
MTS0352056008/2235205100N - 600NElastic
MTS0402156008/2240215100N - 600NElastic
MTS0452256008/2245225100N - 600NElastic
MTS0502356008/2250235100N - 600NElastic
MTS0552456008/2255245100N - 600NElastic
MTS0602556008/2260255100N - 600NElastic
MTS0652656008/2265265100N - 600NElastic
MTS0702756008/2270275100N - 600NElastic
MTS0752856008/2275285100N - 600NElastic
MTS0802956008/2280295100N - 600NElastic
MTS0853056008/2285305100N - 600NElastic
MTS0903156008/2290315100N - 600NElastic
MTS0953256008/2295325100N - 600NElastic
MTS10033560010/22100335100N - 600NElastic

10. BC Series Locking Gas Springs for Barber Chairs

Designed for professional barber and tattoo chairs, GASTAC’s BC series utilizes an advanced rigid-in-tension locking design to eliminate all linear play. Bypassing the elastic cushioning of standard furniture, these gas springs ensure the headrest and backrest remain rock-solid under high lateral styling loads. This delivers an unyielding, wobble-free platform for precise razor, clipper, and tattoo work.

GASTAC Part NumberRod / Tube Dia. (mm)Stroke (mm)Extended Length (mm)Force Range (F1)Locking Type
BC06023050010/2260230250N - 500NRigid
BC07025555010/2270255300N - 550NRigid
BC08028060010/2280280350N - 600NRigid
BC09030570010/2290305400N - 700NRigid
BC10033075010/22100330400N - 750NRigid

11. RC Series Locking Gas Springs for Recliner Chairs

In residential upholstery, a few millimeters of stroke change at the mechanical pivot translates to degrees of smooth motion on the footrest and backrest. GASTAC RC series delivers an ultra-compact 15mm to 60mm stroke grid, masterfully calculated to sync with global standard recliner ironmongery (such as Leggett & Platt profiles). By minimizing the stroke and maximizing hydraulic control stability, we prevent ‘dead play’ and sagging in the linkage while maintaining a high F1 output in an incredibly small installation envelope.

GASTAC Part NumberRod / Tube Dia. (mm)Stroke (mm)Extended Length (mm)Force Range (F1)Locking Type
RC151203508/2215120150N - 350NElastic
RC201304008/2220130180N - 400NElastic
RC251404008/2225140180N - 400NElastic
RC301504508/2230150200N - 450NElastic
RC351604508/2235160200N - 450NElastic
RC401755008/2240175200N - 500NElastic
RC451855008/2245185250N - 500NElastic
RC501955508/2250195250N - 550NElastic
RC602156008/2260215300N - 600NElastic

12. MD Series Locking Gas Springs for Medical Deds

Designed for medical and hospital beds, GASTAC’s MD series features an advanced rigid-in-compression locking matrix to ensure the backrest or knee sections remain rock-solid under Safe Working Loads (SWL) up to 250kg. Fully optimized for ICU and bariatric profiling beds, the 50mm to 200mm precision stroke spectrum overcomes linkage leverage losses while enabling smooth, controlled emergency descent (CPR release compatibility). This guarantees zero-drift patient positioning and fluid adjustment within demanding clinical environments.

GASTAC Part NumberRod / Tube Dia. (mm)Stroke (mm)Extended Length (mm)Force Range (F1)Locking Type
MD060220040010/2260 mm220 mm150N - 400NRigid
MD080260045010/2280 mm260 mm150N - 450NRigid
MD100300055010/22100 mm300 mm200N - 550NRigid
MD120340060010/22120 mm340 mm250N - 600NRigid
MD140385070010/28140 mm385 mm300N - 700NRigid
MD160425080010/28160 mm425 mm300N - 800NRigid
MD180465090010/28180 mm465 mm400N - 900NRigid
MD200505100010/28200 mm505 mm400N - 1000NRigid

13. ACS Series Locking Gas Springs for Amtrak Coach Seats

Designed for intercity rail and passenger coach seating, GASTAC’s ACS series delivers customized rigid locking configurations built strictly to your prints to match specific transit frames. These gas springs maximize hydraulic impact absorbency to eliminate “dead play” and structural rattling caused by constant track vibrations. By micro-matching your exact travel requirements, this series ensures smooth, infinite backrest recline and reliable counter-balance stability within tight back-shell clearances.

GASTAC Part NumberRod / Tube Dia. (mm)Stroke (mm)Extended Length (mm)Force Range (F1)Locking Type
ACS05018545010/2250 mm185 mm200N - 450NElastic
ACS06020550010/2260 mm205 mm200N - 500NElastic
ACS07022555010/2270 mm225 mm250N - 550NElastic
ACS08024560010/2280 mm245 mm250N - 600NElastic
ACS09026565010/2290 mm265 mm300N - 650NElastic
ACS10029070010/22100 mm290 mm300N - 700NElastic
ACS11034070010/22110 mm310 mm350N - 700NElastic
ACS12033075010/22120 mm330 mm350N - 750NElastic

Structure of Locking Gas Springs

A locking gas spring achieves its controllable positioning through a specialized dual-chamber system separated by a valve mechanism. Unlike standard gas springs, it contains an internal valve rod running through a hollow piston rod, allowing users to lock the spring at any point along its stroke.

1
The Actuation Mechanism

Hollow Piston Rod & Internal Release Pin

The piston rod is precision-ground and hollowed to house a solid steel release pin (actuator pin). When the external lever presses this pin, it pushes downward to open the internal valve.

2
The Flow Control Center

Piston Assembly with Integrated Valve

The piston divides the pressure cylinder into two separate oil/gas chambers. It contains an internal valve sealed with specialized high-pressure rubber rings (O-rings) to control fluid migration.

3
Gas & Fluid Storage

Dual-Chamber Pressure Cylinder

Depending on the locking type (Rigid or Elastic), the cylinder is filled with high-pressure nitrogen (N2) gas for lifting force, paired with a specific volume of hydraulic oil for blocking and damping.

4
Pressure Retention & Alignment

Guide and Seal Package

Located at the cylinder exit, a heavy-duty seal package (comprising lip seals, scrapers, and a guide bush) ensures zero gas leakage and perfect linear alignment under high side-loads.

For a better understanding of our locking gas spring technology, we present a cross-sectional structural diagram detailing the precision internal components engineered inside the cylinder.

Additionally, we have included a demonstration video to illustrate the exact mechanical function of the internal valve and fluid transfer during operation.

The Internal Structure of GASTAC Locking Gas Springs

Locking Gas Springs Sports Video

GASTAC Gas Springs Manufacturing Factory

The GASTAC manufacturing facility features a modern, clean, and highly organized industrial environment optimized for precision production. Inside our specialized workshops, advanced automated assembly lines run alongside climate-controlled testing areas, ensuring zero contamination during the critical sealing and fluid-filling stages. With smart floor layouts, strict dust-control protocols, and standard lean-manufacturing workflows, our factory environment is fully equipped to maintain absolute product consistency, clean room compatibility, and high-efficiency output for global B2B clients.

GASTAC Gas Springs Factory Environment

GASTAC Production Equipments

How are Gas Springs Produced?

To further explain our locking gas springs, we provide deeper insights into our production process here. In this section, you will discover every manufacturing detail of GASTAC’s lockable gas struts—one of the most critical components used in medical equipment and commercial furniture.

Tube Processing — Gas Springs Raw Materials

Seamless Steel Tube for Locking Gas Springs

Seamless steel tubes are mandatory, while welded tubes are strictly prohibited, because the welded area is considered to be inhomogeneous (non-uniform in structure). If a welded tube is applied, it will very likely lead to the following problems:

  • Gas cylinder leakage: Nitrogen gas will escape through the microscopic gaps or weak spots in the weld seam.
  • Tube deformation: The cylinder will easily deform or warp when subjected to high internal pressure, heavy loads, or sudden shock impacts.

Seamless steel pipe
Cut into suitable lengths

Surface polishing and concentric machining ensure perfect piston operation inside the tube.

Gas Springs Steel Pipe Cleaning

Following the machining process, raw steel tubes naturally retain cutting fluids and micro-iron filings. At GASTAC, every cylinder undergoes a multi-stage ultrasonic cleaning and degreasing process prior to assembly. Eliminating these microscopic particulates is critical; even the smallest debris can damage the high-pressure rubber seals—especially the O-ring—and cause premature nitrogen gas leakage.

Gas Springs Rolling Crimping

  • 1. Rolling Crimping: Cold hydraulic rollers press the tube into end-cap grooves. Fast, zero heat, and 100% gastight.
  • 2. Projection Welding: Instant electric pulse fuses the tube and end-cap together. High strength, minimal heat.
  • 3. Friction Welding: Ultra-high-speed friction melts the metals together. Flawless joint, strong as steel.
  • 4. Threading & Gluing: Internal/external threads screwed tight with industrial metal glue. Zero heat, best for heavy-duty custom struts.

Manual testing interface

Oil filling of steel pipes

Gas Springs Assembly

Assemble Gas Springs

  • Loading: The precision-cleaned piston rod, piston, guide bushing, and high-pressure seals are loaded into the seamless steel tube.
  • Crimping: Hydraulic machines roll a precise crimping groove onto the tube, permanently locking the internal guide components in place.
  • Filling & Sealing: Hydraulic oil is injected for damping, followed by high-pressure nitrogen gas inflation to achieve the exact target force.
  • Testing: Every assembled gas spring undergoes 100% force validation and leakage inspection to ensure zero defects.

Gas Springs Crimping Groove

Gas Springs Nitrogen Filling

Gas Springs Finished Product Cleaning

Before packaging, every finished gas spring undergoes a thorough wash to remove all residual oil and fingerprints. This ensures a pristine, smudge-free finish and prevents external dust from sticking to the piston rod during operation.

Gas Springs Testing

Every GASTAC gas spring undergoes 100% rigorous testing before delivery. We perform automated force validation to ensure exact lifting specs, advanced pressure-leakage checks to guarantee a perfect seal, and mechanical stroke testing to ensure flawless, smooth operation.

Gas Springs Production Process Video

Take a quick look inside the GASTAC factory to see the advanced manufacturing behind our high-performance gas springs. This video showcases our lean production lines, strict quality controls, and 100% rigorous testing that ensure every product delivers zero-defect reliability.

If you have any specific requirements, please contact professional GASTAC team. You can also visit our YouTube channel to explore various gas spring models and their diverse applications, helping you get a deeper understanding of the GASTAC brand.

Gas Spring Shipment & Delivery

Gas Springs Labeling

Gas Springs Pallet Packaging

Quality Control of GASTA Gas Springs

GASTAC factory is ISO9001 and IATF 16949 certified, ensuring international automotive-grade quality management. Every GASTAC gas spring complies with RoHS and REACH standards for environmental safety, delivering certified durability and reliable performance worldwide.

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