Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- 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 SAIJ40 Adjustable Cylinder SAIJ40X550-50S
The AirTAC SAIJ40X550-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster, enabling you to dial back the nominal 550 mm travel to anywhere within a 500-550 mm usable window. Delivering 879 N of push force at 0.7 MPa, it is equipped with a carbon steel rod and a PT tapered port thread. The integrated -S magnet allows seamless position detection using AirTAC CMSE reed or DMSE electronic solid-state sensors.
Because the adjustment mechanism acts as a mechanical stop at the retract end, it allows for fine end-position tuning during commissioning without swapping out the cylinder or adding external stops. Remember that this rear adjuster and the variable air cushions only decelerate the travel; they do not function as a lock to hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 550 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 SAIJ40X550-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×550 | 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 SAIJ40X550-50S Is Used
Machine Changeover
Quickly fine-tune the 500-550 mm travel window during product size transitions without disassembling the cylinder or bolting on external stops.
Variable End-Stop Setup
Perfect for dialing in the exact retract position at commissioning, using the rear mechanical screw to set the precise 500-550 mm end-point.
Assembly Line Positioning
Provides 879 N of push force at 0.7 MPa for pressing or pushing tasks, with the -S magnet enabling DMSE solid-state sensors for precise stroke monitoring.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-50S the Right Cylinder?
Choose this 40 mm bore cylinder when an application requires 879 N of push force at 0.7 MPa, stepping up from a 32 mm bore that provides 563 N, or down from a 50 mm bore delivering 1374 N. An adjustable stroke is highly beneficial for machine setups requiring variable end-stops or product-size changeovers, offering far more flexibility than a fixed-stroke SAI cylinder. If your process requires holding a load without continuous air pressure, consider the SAIL or BSAI series instead, as the SAIJ adjuster is strictly a travel stop.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 550 mm nominal stroke, 50 mm adjustment range, G1/4 port, and -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2. Given the 550 mm stroke, the M12x1.25 rod is susceptible to side-loading; always use an external guide to prevent premature wear.
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 SAIJ40X550-50S FAQ
The rear adjuster acts as a mechanical stop that trims the effective travel. For this model, you can shorten the 550 mm nominal stroke by up to 50 mm, giving an adjustable usable travel window of 500-550 mm.
At an operating pressure of 0.7 MPa, the SAIJ40X550-50-S provides 879 N of push force and 740 N of pull force. It operates at speeds between 30 and 800 mm/s.
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1-Year Warranty
Covers non-human-caused product damage.
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