Description
ATTWOOD SpringLift Stainless Steel Gas Spring 20″ Extended, 12″ Compressed, Ball Mount, 120 lb – ST34-120#-5
The Attwood SpringLift ST34-120#-5 stainless steel gas spring is a heavy-duty marine-grade lift support designed for smooth, controlled opening and closing of heavier boat hatches, engine covers, lids, storage compartments, covers, doors, and access panels. With a 20″ extended length, 12″ compressed length, 8″ stroke, and 120 lb force rating, it is built for larger applications that require strong lift assistance, corrosion resistance, and dependable hold-open support.
- SpringLift stainless steel marine gas spring for heavier hatches, engine covers, lids, and compartments
- 20″ extended length and 12″ compressed length for larger lift-support applications
- 120 lb force rating for heavy-duty lift assistance and strong hold-open support
- 10 mm composite ball socket end fittings for secure mounting
- Stainless steel shell and rod for improved corrosion resistance in marine environments
Attwood stainless steel gas springs are built for marine hardware applications where corrosion resistance, smooth operation, and dependable support matter. This ST-Series gas spring features a stainless steel shell and rod, combined with high-strength corrosion-proof composite end fittings, making it a strong choice for hatches, engine covers, and compartments exposed to moisture, spray, and harsh boating conditions.
Built for Marine Environments
The stainless steel construction helps resist corrosion better than standard steel gas springs, making this model ideal for boats, docks, RVs, and other wet-environment applications. It is designed to replace an existing 20″ x 12″ ball-mount gas spring with a 120 lb pressure rating.
Ball Socket Mounting
The 10 mm composite ball socket end fittings are designed to attach to compatible 10 mm ball-stud mounting brackets. Mounting brackets are sold separately, so existing hardware should be checked for compatibility before installation.
Specifications
| Manufacturer | Attwood |
| Model | SpringLift Stainless Steel / INOX Stainless Standard Series |
| Part Number | ST34-120#-5 / ST34-120-5 |
| Product Type | Marine Stainless Steel Gas Spring / Lift Support |
| Extended Length | 20″ |
| Compressed Length | 12″ |
| Stroke / Travel Length | 8″ |
| Force Rating | 120 lb |
| Rod Diameter | 8 mm |
| Cylinder Diameter | 18 mm |
| End Fitting Style | 10 mm Composite Ball Socket |
| Material | Stainless steel shell and rod with composite end fittings |
| Mounting Brackets | Sold separately |








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