Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-50
The AirTAC SAIJ40X135-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 135 mm travel back by up to 50 mm. This creates an 85-135 mm usable window, allowing precise end-position tuning at commissioning without swapping hardware. The extruded aluminum barrel avoids tie-rod construction and carries sensor grooves on both sides.
Operating at 0.5 MPa, it delivers 628 N of push force and 528 N of pull force. This specific SKU is built with a SUS304 stainless steel rod (option B) for superior corrosion resistance and features PT tapered port threading. The 16 mm rod and M12x1.25 thread provide robust load transmission, while the 30 mm cushion length ensures controlled deceleration at both ends.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 135 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 SAIJ40BX135-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×135 | 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 SAIJ40BX135-50 Is Used
Product Changeover
Dial in the 85-135 mm travel window during format changes on packaging lines without physically replacing the cylinder or adding external stopper blocks.
Commissioning Calibration
Fine-tune the exact retract end-position during machine setup, absorbing mechanical tolerances by adjusting the rear screw up to 50 mm.
Variable End-Stop Machining
Use the adjustable stroke to precisely set tooling contact depth on custom fixtures, leveraging the 628 N push force at 0.5 MPa.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX135-50 the Right Cylinder?
Choose this 40 mm bore when 628 N of push force at 0.5 MPa is sufficient, stepping down from a 50 mm bore (982 N) to save space and air consumption, or moving up from a 32 mm bore (402 N) when higher thrust is required. The 50 mm adjustment range is ideal for product changeovers, letting you dial in a new end-stop without adding external stops or changing the cylinder.
For a direct ISO 15552 replacement, match the 40 mm bore, 135 mm stroke, 50 mm adjustment, PT port thread, SUS304 rod, and standard mounting footprint. Since the stroke is 135 mm, ensure external guiding if side loads are present. Note that the rear adjuster acts only as a travel stop; for load-holding without live air pressure, consider an AirTAC SAIL or BSAI series cylinder.
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 SAIJ40BX135-50 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.9 MPa, the push force increases to 1130 N. The operational speed range is 30-800 mm/s.
The rear adjuster screw acts as a mechanical stop that can shorten the nominal 135 mm stroke by up to 50 mm, creating an 85-135 mm usable travel window. It trims the end position but does not lock or hold the load without continuous air pressure.
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