This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X275-20, 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 SIJ125X275-20
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X275-20 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 SAIJ125X275-20, 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 → SAIJ125X275-20
- 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 SIJ125X275-20
The AirTAC SIJ125X275-20 is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, giving a usable 255-275 mm range.
The direct replacement is the SAIJ125X275-20, matching the bore, stroke, force, and mounting. The SAIJ upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a -S magnet, so it cannot take a switch.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-20 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-20 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X275-20 |
| 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 SAIJ125X275-20 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 SAIJ125X275-20 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 SIJ125X275-20
| 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 SIJ125X275-20 Is Used
Press Fit Tuning
Adjust the 20 mm extend window on-site to dial in the exact seating depth of bearings without machining custom spacers.
Divertor Stroke Trimming
Fine-tune the actuator end position to match varying package sizes on the fly, ensuring positive contact without overtravel.
Pallet Stop Positioning
Set the precise stop location for different pallet footprints by trimming the extend stroke up to 20 mm directly at the fixture.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X275-20 with the SAIJ125X275-20
Replace the discontinued SIJ125X275-20 directly with the SAIJ125X275-20, reusing your existing ISO 15552 mounting hardware (Basic, FA, LB, TC). The 20 mm adjust window lets you tune the extend end-position on-site, but remember the stop screw sets the end position and is not a load lock; for held loads use an external rod lock or the SAIL/BSAI variants. This non-magnetic SKU cannot accept a sensor. For stroke lengths of 300 mm or more, verify your side-load limits to prevent excessive guide wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X275-20
- ✓ 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 SIJ125X275-20 FAQ
Yes, the SIJ125X275-20 is discontinued. The direct replacement is the SAIJ125X275-20, which shares the same ISO 15552 interface, 125 mm bore, 275 mm stroke, 20 mm adjust window, and G1/2 port. The SAIJ family also adds an upgraded two Y-shaped one-way piston seal for longer life.
This 125 mm bore cylinder has a 20 mm adjustable stroke window (usable extend stroke 255-275 mm). It operates at 30-500 mm/s. The external stop sets end position but is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X275-20
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X275-20 replacement — usually within 7-8 hours.