This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X275-40, 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 SIJ125 Double Rod Adjustable Cylinder SIJ125X275-40
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X275-40 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 275mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X275-40, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X275-40
- 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 SIJ125 Double Rod Adjustable Cylinder SIJ125X275-40
The AirTAC SIJ125X275-40 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 275 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 40 mm on-site, yielding a usable 235-275 mm stroke. This SIJ series is discontinued; the direct replacement is the SAIJ125X275-40, sharing the same interface, force, and mounting.
The SAIJ successor retains the ISO 15552 mounting dimensions for direct reuse of FA, LB, and TC brackets, and uses an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. Note this non-magnetic SKU cannot take a sensor switch, and the external stop sets end position but is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-40 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X275-40 |
| Bore size | Ø125 mm |
| Stroke | 275 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ125X275-40 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAIJ125X275-40 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-40
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | 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 SIJ125 Double Rod Adjustable Cylinder SIJ125X275-40 Is Used
Press Tonnage Calibration
Needs field stroke tuning to set precise lower-die contact points without re machining the fixture, utilizing the 235-275 mm extend window.
Package Diverter Setup
Requires adjustable extend endpoints to handle varying carton widths on the fly, using the 40 mm on-site stroke trim to avoid hard stops.
Pallet Positioning Gate
Demands exact end-position limits for different pallet depths, allowing operators to dial in the stop screw rather than swapping cylinders.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-40 with the SAIJ125X275-40
To replace the discontinued SIJ125X275-40, order the direct replacement SAIJ125X275-40, matching the 125 mm bore, 275 mm max stroke, 40 mm adjust window, and G1/2 port. Choose the 40 mm adjust window if your end-position tuning falls within 235-275 mm; the stop screw sets the end position but provides no load-holding capability. Reuse existing FA, LB, or TC mounts via the ISO 15552 interface. Because this SKU lacks the -S suffix, it has no magnet and cannot accept legacy CS1-B or DS1-B sensors. For stroke lengths of 300 mm or above, verify side-load guidance to prevent rod deflection.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X275-40
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-40 FAQ
Yes, the SIJ125X275-40 is discontinued. The direct replacement is the SAIJ125X275-40, which matches the 125 mm bore, 275 mm stroke, 40 mm adjust window, G1/2 port, and ISO 15552 mounting interface.
The external stop screw offers a 40 mm adjust window, allowing you to trim the extend stroke from the 275 mm maximum down to 235 mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X275-40
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X275-40 replacement — usually within 7-8 hours.