This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X250-30, 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 SIJ125X250-30
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X250-30 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 250mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X250-30, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X250-30
- 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 SIJ125X250-30
The AirTAC SIJ125X250-30 is a double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 250 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 30 mm on-site, yielding a usable 220-250 mm extension. This SIJ series is discontinued; the direct replacement is the SAIJ125X250-30, 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. Note this SKU lacks a magnet (-S) and cannot take a switch. The stop screw sets end position but is not a load lock; for held loads use an external rod lock or SAIL/BSAI variant.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-30 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-30 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X250-30 |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125X250-30 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 SAIJ125X250-30 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 SIJ125X250-30
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SIJ125X250-30 Is Used
Press Fit Tuning
Allows operators to dial in the exact 220-250 mm extend position for pressing bearings without machining custom spacers.
Divertor Gate Adjustment
Provides on-site stroke trimming to fine-tune product diverting distances on a packaging line handling varied carton sizes.
Pallet Stop Positioning
Enables field adjustment of the extend stop to accommodate different pallet depths entering a stretch wrapper.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-30 with the SAIJ125X250-30
To replace the discontinued SIJ125X250-30, order the direct replacement SAIJ125X250-30, which preserves the 250 mm stroke, 30 mm adjust window, G1/2 port, and ISO 15552 mounting (Basic, FA, LB, TC). Choose the 30 mm adjust window if your extend stroke needs on-site tuning between 220 and 250 mm. Because this SKU has no -S suffix, it lacks a magnet and cannot support legacy CS1-B/DS1-B sensors. For strokes of 300 mm or longer, carefully manage side-load moments to prevent premature seal wear. Remember the stop screw only sets the end position; it is not a lock, and a plain cylinder drifts on air loss, so specify an external rod lock or pilot-operated check valve for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X250-30
- ✓ 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 SIJ125X250-30 FAQ
Yes, the SIJ125X250-30 is discontinued. The direct replacement is the SAIJ125X250-30, offering the same 125 mm bore, 250 mm stroke, 30 mm adjust window, G1/2 port, and ISO 15552 mounting interface.
The external stop screw provides a 30 mm adjust window, allowing the 250 mm extend stroke to be shortened to 220 mm on-site. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X250-30
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X250-30 replacement — usually within 7-8 hours.