This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X250-100, 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 SIJ125X250-100
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X250-100 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 SAIJ125X250-100, 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 → SAIJ125X250-100
- 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 SIJ125X250-100
The AirTAC SIJ125X250-100 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 100 mm on-site, giving a usable 150-250 mm window from the 250 mm nominal maximum. Because this SKU lacks a -S magnet, it cannot accept a magnetic switch.
The direct replacement is the SAIJ125X250-100, matching the bore, stroke, force, and mounting. The SAIJ family uses an upgraded two Y-shaped one-way piston seal for low start-up pressure and long life. Note the stop screw sets end position only; it is not a load lock.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-100 Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-100 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X250-100 |
| 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 SAIJ125X250-100 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 SAIJ125X250-100 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 SIJ125X250-100
| 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 SIJ125X250-100 Is Used
Press Fit Tuning
Allows operators to dial in the exact 150-250 mm extend position on-site for pressing bearings without machining custom spacers.
Variable Length Diverter
Adjusts the extend stroke up to 100 mm to deflect varying package sizes on a packaging line, ensuring positive contact without repositioning the cylinder.
Adjustable End Stop
Sets a precise physical end position for pallets or heavy loads, accommodating different pallet depths by shortening the stroke from the 250 mm maximum.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-100 with the SAIJ125X250-100
To replace the discontinued SIJ125X250-100, order the direct replacement SAIJ125X250-100, which retains the M27x2 rod thread, G1/2 port, and 40 mm adjustable cushions. Choose the -100 mm adjust window when you need on-site tuning from 150 to 250 mm; a fixed SAI cylinder with an external stop lacks this integrated trim flexibility. Mounting interfaces (Basic, FA, LB, TC) reuse existing ISO 15552 holes. For strokes of 300 mm or longer, verify side-load limits to prevent rod binding. This non-magnetic SKU cannot use legacy CS1-B/DS1-B sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X250-100
- ✓ 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 SIJ125X250-100 FAQ
Yes, the SIJ125X250-100 is discontinued. The direct replacement is the SAIJ125X250-100. It shares the same ISO 15552 interface, 125 mm bore, 250 mm nominal stroke, 100 mm adjust window, and G1/2 port. The SAIJ features an upgraded piston seal for longer life.
The theoretical max is 1251 kgf at 1.0 MPa. The external stop screw provides a 100 mm adjust window, allowing the extend stroke to be shortened from 250 mm down to 150 mm on-site. The stop sets position only and does not lock the load.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X250-100
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X250-100 replacement — usually within 7-8 hours.