This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X100-50S, 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 SIJ125X100-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X100-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 100mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X100-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke100 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X100-50S
- 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 SIJ125X100-50S
The AirTAC SIJ125X100-50S is a double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 100 mm nominal stroke. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, yielding a usable extend range of 50-100 mm. This SIJ unit is discontinued; the direct replacement is the SAIJ125X100-50S, sharing the same ISO 15552 interface, bore, force, and porting.
The stop screw sets the end position but is not a load lock; the cylinder drifts on air loss, so use an external rod lock or SAIL/BSAI variant for held loads. Upgrading to the SAIJ brings an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X100-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X100-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X100-50S |
| Bore size | Ø125 mm |
| Stroke | 100 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 SAIJ125X100-50S 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 SAIJ125X100-50S 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 SIJ125X100-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×100 | 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 SIJ125X100-50S Is Used
Press Fit Tuning
Dialing in the exact insertion depth of a bearing press where material thickness varies, using the 50 mm on-site extend trim to set the hard stop without re machining the fixture.
Variable Format Sealing
Adjusting the extend end position for a carton sealing head on a packaging line, allowing operators to trim the 100 mm stroke down to 50 mm for smaller carton heights.
Adjustable Stops
Setting a physical end stop for a pallet positioning actuator, providing a repeatable mechanical reference that can be fine-tuned on-site as pallet dimensions change.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X100-50S with the SAIJ125X100-50S
To replace the discontinued SIJ125X100-50S, order the direct replacement SAIJ125X100-50S, which preserves the 125 mm bore, 100 mm nominal stroke, 50 mm adjust window, G1/2 port, and ISO 15552 mounting. Choose the 50 mm adjust window if your fixture requires precise on-site end-position tuning between 50 and 100 mm; the stop screw sets this position but does not lock the load. Mounting options include FA, LB, and TC brackets. The -S suffix confirms the piston magnet is present for legacy CS1-B/DS1-B sensors. For strokes at or above 300 mm, verify side-load limits to prevent guide bushing wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X100-50S
- ✓ 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 SIJ125X100-50S FAQ
Yes, the SIJ125X100-50S is discontinued. The direct replacement is the SAIJ125X100-50S. It shares the same ISO 15552 interface, 125 mm bore, 100 mm stroke, 50 mm adjust window, G1/2 port, and mounting options. The SAIJ upgrade features an improved piston seal with two Y-shaped one-way elements for longer life and lower start-up pressure.
The external stop screw provides a 50 mm adjust window, allowing you to trim the 100 mm nominal extend stroke down to 50 mm on-site. The stop sets end position but is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X100-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X100-50S replacement — usually within 7-8 hours.