Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 185mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke185 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-30
The AirTAC SAIJ40X185-30 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 185 mm travel that can be fine-tuned down by up to 30 mm, yielding a precise 155-185 mm usable window. Delivering 879 N of push force at 0.7 MPa, it fits mid-range automation tasks perfectly.
This variant utilizes a SUS304 stainless steel piston rod for superior corrosion resistance and ships with PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this specific SKU omits the magnet, meaning CMSE or DMSE electronic switches cannot be used without modification.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 185 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×185 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-30 Is Used
Machine Commissioning
Dial in the exact 155-185 mm end position during initial setup to perfect tooling alignment without machining custom spacers.
Product Changeover
Quickly adjust the stroke by up to 30 mm on packaging lines when switching between different product sizes.
Assembly Fixtures
Leverage the 628 N push force at 0.5 MPa and SUS304 rod for precise, repeatable clamping in corrosive environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-30 the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (providing 563 N push at 0.7 MPa) is insufficient, but a 50 mm bore (1374 N) would be excessive. The 30 mm adjustment range is ideal for dialing in exact end positions during machine commissioning or product changeovers without swapping hardware. Since the nominal stroke is under 300 mm, external side-load guides are less critical, though the M12x1.25 rod thread handles standard loads well.
Remember that the rear adjuster functions strictly as a mechanical stop to set deceleration, not as a locking device; it will not hold a load without continuous air pressure. For secure load-holding, consider the SAIL or BSAI series. When replacing an ISO 15552 cylinder, verify the 40 mm bore, 185 mm stroke, 30 mm adjuster, PT port, and required mounting bracket (Basic, FA, LB, TC, FTC, TCM1, or TCM2).
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX185-30 FAQ
At 0.5 MPa, it provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
A rear screw acts as a mechanical stop, allowing you to shorten the effective travel from the nominal 185 mm down to 155 mm. It sets the end position but does not lock the load without air pressure.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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