This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X275-40S, 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 SIJ125X275-40S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X275-40S 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 SAIJ125X275-40S, 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 → SAIJ125X275-40S
- 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 SIJ125X275-40S
The AirTAC SIJ125X275-40S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. A 40mm external stop screw lets you trim the extend stroke on-site from the 275mm maximum down to 235mm. The direct replacement is the SAIJ125X275-40S, matching the interface, force, and adjust window.
The SAIJ successor retains the ISO 15552 mounting dimensions but upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. The stop screw sets the end position but is not a load lock; the cylinder drifts on air loss. For held loads, use an external rod lock or the SAIL/BSAI variants.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-40S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X275-40S |
| 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 SAIJ125X275-40S 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 SAIJ125X275-40S 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 SIJ125X275-40S
| 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 SIJ125X275-40S Is Used
Press Fit Tuning
Needs field stroke tuning to dial in the exact 235-275mm extend position for pressing bearings without machining hard stops.
Variable Length Diverter
Requires on-site stroke trimming to adjust package diverting arms on the fly as product sizes change on the line.
Adjustable Pallet Stop
Uses the 40mm adjust window to fine-tune the end position for different pallet depths before final clamping.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-40S with the SAIJ125X275-40S
To replace this discontinued SIJ125X275-40S, use the SAIJ125X275-40S direct, keeping the 275mm nominal stroke and 40mm adjust window. Choose the 40mm adjust window if you need field stroke tuning between 235mm and 275mm. Reuse FA, LB, or TC ISO 15552 mounts. The -S suffix includes a piston magnet for CS1-B/DS1-B switches. For strokes >=300mm, verify side-load limits to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X275-40S
- ✓ 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 SIJ125X275-40S FAQ
Yes, the SIJ125X275-40S is discontinued. The direct replacement is the SAIJ125X275-40S. It shares the same ISO 15552 interface, 125mm bore, 275mm stroke, 40mm adjust window, and G1/2 port, but features an upgraded piston seal.
The external stop screw window is 40mm, allowing you to shorten the extend stroke from the 275mm maximum down to 235mm on-site.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X275-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X275-40S replacement — usually within 7-8 hours.