Airtac SAIJ50 Adjustable Cylinder SAIJ50BX135-40S
The AirTAC Airtac SAIJ50 Adjustable Cylinder SAIJ50BX135-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø50mm 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.
- BoreØ50 mm
- Stroke135 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- CushionAdjustable, 30 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX135-40S
The AirTAC SAIJ50X135-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 135 mm stroke that can be fine-tuned backward by up to 40 mm, yielding a usable travel window of 95-135 mm to perfectly dial in end positions during commissioning. Delivering 982 N of push force at 0.5 MPa, it bridges the gap between lighter 40 mm bores and heavier 63 mm units.
This specific SKU is built with a SUS304 stainless steel rod (code B) for superior corrosion resistance and ships with a magnet (-S) for position sensing. The extruded aluminum barrel features sensor grooves on both sides, directly accepting AirTAC CMSE reed and DMSE electronic solid-state switches. It uses PT tapered ports and offers the standard SAIJ mounting set, including Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ50 Adjustable Cylinder SAIJ50BX135-40S Technical Specifications
| Model | Airtac SAIJ50 Adjustable Cylinder SAIJ50BX135-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 135 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ50 Adjustable Cylinder SAIJ50BX135-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 50 | 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 SAIJ50 Adjustable Cylinder SAIJ50BX135-40S Is Used
Machine Changeover
Fine-tune the 95-135 mm stroke on the fly during product size transitions without swapping out the entire cylinder assembly.
End-Position Tuning
Dial in the exact retraction point during commissioning using the rear screw, avoiding the need for external mechanical stops.
Corrosive Assembly Lines
Leverage the SUS304 stainless steel rod and 982 N force for reliable actuation in washdown or mildly corrosive manufacturing environments.
Is the Airtac SAIJ50 Adjustable Cylinder SAIJ50BX135-40S the Right Cylinder?
Select this 50 mm bore when an application requires approximately 982 N of push force at 0.5 MPa, stepping up from the 40 mm bore (628 N) without the bulk of a 63 mm cylinder (1559 N). The adjustable 95-135 mm travel window is ideal for machine setups requiring variable end stops or frequent product-size changeovers, eliminating the need to physically swap cylinders or bolt on external stoppers. To replace an ISO 15552 cylinder, match the 50 mm bore, 135 mm stroke, 40 mm adjustment, PT G1/4 port, and the -S magnet requirement.
Because the nominal stroke is 135 mm, side-loading is less severe than on longer strokes, but an external guide is still recommended for heavy off-center loads. Remember that the rear adjuster acts strictly as a travel stop, not a lock; the SAIJ cannot hold a load without live air pressure. For true load-holding, consider the SAIL or BSAI series instead.
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 SAIJ50 Adjustable Cylinder SAIJ50BX135-40S FAQ
At a 0.5 MPa operating pressure, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. At 0.7 MPa, the push force increases to 1374 N.
The rear adjuster screw allows you to shorten the effective travel by up to 40 mm from the 135 mm nominal stroke, creating a 95-135 mm usable window. It acts as a mechanical stop and does not lock the load without live air.
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