Choosing a pneumatic air cylinder for an automation project often comes down to two numbers: bore and stroke. In the hydraulics pneumatics aisle, the BAOMAIN and TECHTONGDA models take different approaches-one favors a wider piston, the other a longer reach. Here's how to decide which one belongs in your setup.
Quick Verdict
If you want a cylinder with more piston area and low-maintenance operation, the BAOMAIN is the stronger fit. If your machine needs longer linear travel and a lower purchase price, the TECHTONGDA is the better choice. Both are double-acting standard pneumatic cylinders with aluminum alloy bodies, so the real decision is force versus travel.
At a Glance
| Feature | BAOMAIN 5" Bore / 15" Stroke | TECHTONGDA SC 100 x 450 |
|---|---|---|
| Price | $77.17 | $64.17 |
| Bore | 5 inches | 4 inches |
| Stroke | 15 inches | 18 inches |
| Action | Double-acting | Double-acting |
| Body Material | Aluminum alloy | High-precision aluminum alloy |
| Condition | New - Open box | New |
| Notable Detail | Self-lubricating bearing | Rated for -20 to 80°C ambient/fluid temperature |
Where Each Cylinder Wins
The BAOMAIN wins on bore and maintenance. Its 5-inch bore provides more piston surface than the TECHTONGDA's 4-inch bore, and the self-lubricating bearing is designed to reduce the need for extra oiling. If your machine cycle needs a strong push from a compact travel length, this is the one.
The TECHTONGDA wins on stroke and price. Its 18-inch stroke travels farther per cycle, and its price stays below the BAOMAIN's. It also includes a published operating temperature range of -20 to 80°C, which can be relevant in facilities that run hot or cold air lines. The trade-off is the smaller 4-inch bore, which reduces the available piston area compared with the BAOMAIN.
Product Notes
BAOMAIN Pneumatic Air Cylinder 5" Bore 15" Stroke SC125x380
Pick the BAOMAIN if pure pushing power is the priority. The larger bore gives it a bigger piston surface than the TECHTONGDA, which means more force for a given air pressure. The aluminum alloy construction is durable and suited to demanding industrial environments, and the self-lubricating bearing allows the piston rod to run without adding oil. The downside is travel: the stroke is shorter than the TECHTONGDA's, so you may need more than one cycle to cover the same distance. It is also listed as New - Open box, so give it a quick inspection before installation if condition matters to you.
Air Cylinder Pneumatic Standard Cylinder SC 100 x 450, Bore 4" Stroke 18
Choose the TECHTONGDA when your cycle needs long travel. The longer stroke covers more linear distance per cycle, which can reduce the number of cylinders or linkage components needed in a motion path. The double-acting design lets air move it in both directions, and the high-precision aluminum alloy body is anticorrosive and built for a tight seal. It also lists an ambient and fluid temperature range of -20 to 80°C, a useful specification when your air supply or environment is not room temperature. The smaller bore means less piston area, so you give up some pushing force compared with the BAOMAIN, especially if your air pressure is limited.
Final Choice by Use Case
Before you decide, think about what matters more in your cycle: the weight you need to push or the distance you need to cover. Bore size drives force, and stroke length drives travel.
Choose the BAOMAIN for a compact, high-force cylinder with self-lubricating, low-maintenance operation. Choose the TECHTONGDA when you need to cover more travel per cycle and prefer the lower-priced option. In the hydraulics pneumatics aisle, there's no absolute winner-just the right bore and stroke for your machine.
