What to weigh before you pick
When you're choosing a pneumatic cylinder for a hydraulics and pneumatics project, the first question is rarely which brand to buy. It's how much room you have and how much force the job demands. The cylinder's diameter controls how hard it can push, the rod travel controls how far it can reach, and a double-acting design uses compressed air to move the piston in both directions. This group of four double-acting cylinders covers everything from a compact mini unit to a large industrial-style unit, so the right pick comes down to matching the cylinder's dimensions to the physical space you have.
Quick take: All four cylinders are built to move in both directions, but their dimensions and mounting footprints are very different. The group starts with a compact model and climbs to a high-capacity SC-style cylinder. The table below compares the prices, and the decision matrix matches each one to a project type.
Price comparison
| Product | Price | Price Bar |
|---|---|---|
| Air Cylinder Pneumatic Standard Cylinder SC 100 x 450 (TECHTONGDA) | USD 64.17 | |
| Air Cylinder 16mm Bore 50mm Stroke, Mini Air Pneumatic Cylinder Double Action Si (SWZHAI) | USD 24.37 | |
| BAOMAIN Pneumatic Air Cylinder 5\" Bore 15\" Stroke SC125x380 | USD 77.17 | |
| 25mm Bore 150mm Stroke Double Action Pneumatic Air Cylinder MECCANIXITY | USD 33.99 |
Decision matrix
| Cylinder | Bore | Stroke | Use Case |
|---|---|---|---|
| TECHTONGDA SC 100 x 450 | 4 in | 18 in | Long-travel automation and fixtures |
| SWZHAI Mini Air Cylinder | 16mm | 50mm | Compact assemblies and tight spaces |
| Baomain SC125x380 | 5 in | 15 in | Larger industrial-style shop jobs |
| MECCANIXITY Air Cylinder | 25mm | 150mm | Mid-range automation and light robotics |
Product notes
TECHTONGDA SC 100 x 450
If your project calls for long travel, the TECHTONGDA SC 100 x 450 is the cylinder to look at first. It combines a 4-inch bore with an 18-inch stroke, giving it the longest reach in this comparison. The standard SC body is high-precision aluminum alloy with anti-corrosion, high temperature resistance, and a small stroke error, which supports steady, repeatable motion in automation setups. The piston port size is M20x1, and the rod is a single-rod unit. The main trade-off is the space it needs: the 18-inch stroke demands a good amount of mounting depth, so be sure the frame can accommodate it before committing to this model.
SWZHAI Mini Air Cylinder
For a small fixture or prototype, the SWZHAI mini air cylinder keeps the build simple. Its 16mm bore and 50mm stroke make it the most compact option here, and the bidirectional sealing structure reduces air leakage. The package includes Y connectors and pneumatic quick fittings, so you have some of the small parts needed to connect an air line. That short stroke is also the limiting factor: 50mm of travel only suits close-range motion, and the 16mm bore keeps forces light. If your job only needs a small nudge, this is the cylinder to grab.
Baomain SC125x380
When brute cylinder size is the priority, the Baomain SC125x380 stands out. A 5-inch bore and 15-inch stroke put it at the upper end of this group, and the aluminum-alloy body is built to handle industrial-style automation duty. A self-lubricating bearing lets the piston rod run without extra lubrication, which is a practical perk for equipment that runs often. It is listed as new open-box, so plan to inspect the rod and ports before mounting. The larger bore also means this cylinder is physically the biggest of the four, so give it enough mounting space.
MECCANIXITY 25mm Air Cylinder
Between the mini cylinder and the large SC units sits the MECCANIXITY 25mm model. A 25mm bore and 150mm stroke give it more travel than the compact SWZHAI, while staying much smaller than the 4-inch and 5-inch cylinders. Maximum pressure is 1.0 MPa, and the single-rod design is suited to compressed air, making it a strong fit for light robotics and automation controls. The trade-off is pushing power: the 25mm bore cannot push as hard as the larger bores in this group, so treat it as a mid-range mover rather than a heavy lifter.
Final recommendations
- If you need the longest travel in a standard SC-style cylinder, go with the TECHTONGDA SC 100 x 450 at $64.17. It gives you the most reach in this group.
- If maximum cylinder size and low-maintenance operation matter most, choose the Baomain SC125x380 at $77.17. The self-lubricating bearing reduces the need for extra grease, and it's the biggest unit in the group. Treat it as an open-box unit.
- If you're building a compact fixture and want the lowest-priced cylinder, the SWZHAI mini at $24.37 is a simple starting point.
- If you want a middle ground between reach and size, the MECCANIXITY model at $33.99 balances travel with a compact footprint.
