This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ40X275-50S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X275-50S
The AirTAC SIJ40 Double Shaft Adjustable Cylinder SIJ40X275-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 275mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ40X275-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke275 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAIJ40X275-50S
- 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 SIJ40 Double Shaft Adjustable Cylinder SIJ40X275-50S
The AirTAC SIJ40X275-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 40mm bore and 275mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 50mm on-site, yielding a usable 225-275mm window. The direct replacement is the SAIJ40X275-50S, retaining the G1/4 port, M12x1.25 rod thread, and 27mm adjustable cushions. The SAIJ upgrade utilizes a two Y-shaped one-way piston seal for lower start-up pressure and longer life.
The stop screw sets end position only; it is not a load lock, so use an external rod lock or SAIL variant for held loads. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X275-50S Technical Specifications
| Model | Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X275-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ40X275-50S |
| Bore size | Ø40 mm |
| Stroke | 275 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ40X275-50S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The SAIJ40X275-50S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X275-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×275 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X275-50S Is Used
Variable Depth Forming
Trimming the 275mm extend stroke by up to 50mm on-site to set precise metal forming depths without swapping the entire cylinder body.
Adjustable Transfer Pushers
Tuning the pusher end position between 225mm and 275mm on a packaging line to accommodate varying carton sizes on the fly.
Custom Height Diverter
Setting a specific stop position for sorting goods, where the external screw provides exact field calibration for diverter arms.
Replacing the Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X275-50S with the SAIJ40X275-50S
To replace the discontinued SIJ40X275-50S, order the exact direct replacement SAIJ40X275-50S, keeping the 50mm adjust window for your 225-275mm extend range. Reuse your existing FA, LB, or TC ISO 15552 mounting hardware. The -S suffix confirms the piston magnet is present for position sensing. Because the 275mm stroke exceeds 300mm when combined with the stop screw mechanics, verify side-load guidance to prevent rod binding. Speed ranges 30-800mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ40X275-50S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ40 Double Shaft Adjustable Cylinder SIJ40X275-50S FAQ
Yes, the SIJ40X275-50S is discontinued. The direct replacement is the SAIJ40X275-50S. It shares the identical ISO 15552 interface, 40mm bore, 275mm stroke, 50mm adjust window, G1/4 port, and mounting dimensions, but features an upgraded two Y-shaped one-way piston seal.
The external stop screw provides a 50mm adjustment window, allowing the extend stroke to be shortened from the 275mm maximum down to 225mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ40X275-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ40X275-50S replacement — usually within 7-8 hours.