Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 115mm 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
- Stroke115 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-30S
The AirTAC SAIJ40X115-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel by up to 30 mm. This creates an 85-115 mm usable window, allowing you to dial in the exact retract position at commissioning without swapping hardware. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, utilizing a G1/4 port and a 30 mm cushion stroke.
Equipped with a SUS304 stainless steel rod (code B) and a -S magnet, this unit supports AirTAC CMSE reed and DMSE electronic sensors via the dual-side extruded barrel grooves. The PT tapered port threads provide a metal-to-metal seal, while the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) omits FB, CA, CB, and CR options for streamlined installation.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 115 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 SAIJ40BX115-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×115 | 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 SAIJ40BX115-30S Is Used
Machine Changeover
Fine-tune the 85-115 mm retract distance during product size changes without physically replacing the cylinder or adding external stopper blocks.
End-Position Calibration
Dial in the exact end-of-stroke position during machine commissioning to accommodate sensor placement or tooling variations.
Variable End Stops
Set precise retract limits for automated assembly tooling using the rear adjustment screw, maintaining consistent performance across runs.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-30S the Right Cylinder?
Choose this 40 mm bore when an application requires precise end-position tuning within an 85-115 mm travel window, stepping up from a 32 mm bore that yields 402 N of push force at 0.5 MPa. The adjustable rear stopper acts purely as a travel limit and does not hold the load without live air; for true pneumatic locking, consider the SAIL or BSAI series. Because the stroke is under 300 mm, side-load stress on the 16 mm rod is minimal, though external guides remain recommended for heavy lateral loads.
When specifying an ISO 15552 replacement, match the 40 mm bore, 115 mm nominal stroke, 30 mm adjustment range, PT port thread, and -S magnet requirement. The SAIJ configuration is ideal for product changeovers where the retract distance varies, avoiding the need to bolt on external physical stops.
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 SAIJ40BX115-30S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to shorten the 115 mm nominal stroke by up to 30 mm, creating an adjustable travel window of 85 to 115 mm. This stopper only limits travel and does not lock the load without air pressure.
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