This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X250-100TC, 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 SIJ125X250-100TC
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X250-100TC 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 SAIJ125X250-100TC, 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 → SAIJ125X250-100TC
- 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 SIJ125X250-100TC
The AirTAC SIJ125X250-100TC is a double-acting double-rod ISO 15552 adjustable-stroke cylinder that is officially discontinued. The direct replacement is the SAIJ125X250-100TC, matching the 125mm bore, 250mm nominal stroke, G1/2 port, and TC mounting interface. An external stop screw lets you trim the extend stroke by up to 100mm on-site, yielding a usable extend range of 150-250mm. This stop sets the end position; it is not a load lock.
The SAIJ upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This non-magnet SKU cannot take a switch; for held loads use SAIL or BSAI lock variants, as cushions only decelerate.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-100TC Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-100TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X250-100TC |
| 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 SAIJ125X250-100TC 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 SAIJ125X250-100TC 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 SIJ125X250-100TC
| 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 SIJ125X250-100TC Is Used
Press Fit Tuning
Adjusting the extend stroke on-site by up to 100mm allows operators to dial in precise press fit depths for large bearings without changing the 250mm nominal cylinder stroke.
Variable Length Diverter
A TC-mounted diverter arm on a heavy parcel line can be retracted or extended between 150mm and 250mm to accommodate changing package sizes on the fly.
Adjustable End Stop
Pallet positioning gates use the external stop screw to set the exact 150-250mm extend endpoint for different pallet footprints, ensuring repeatable physical locating.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X250-100TC with the SAIJ125X250-100TC
To replace the discontinued SIJ125X250-100TC, order the direct replacement SAIJ125X250-100TC, reusing your existing ISO 15552 TC mounting. The 100mm adjust window is ideal for field tuning the 250mm nominal stroke down to 150mm without machining. Note this non-magnet SKU cannot accept a sensor (legacy CS1-B/DS1-B require an -S suffix). For stroke lengths >=300mm, verify side-load guidance to prevent rod binding. Remember the stop screw sets end position only; it is not a lock, and a plain cylinder drifts on air loss.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X250-100TC
- ✓ 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 SIJ125X250-100TC FAQ
Yes, the SIJ125X250-100TC is discontinued. The direct replacement is the SAIJ125X250-100TC. It shares the identical ISO 15552 interface, 125mm bore, 250mm stroke, 100mm adjust window, G1/2 port, and TC mounting. The SAIJ family also uses an upgraded two Y-shaped one-way piston seal for longer life and lower start-up pressure.
The external stop screw provides a 100mm adjust window, allowing you to trim the 250mm nominal extend stroke down to 150mm on-site. The stop sets end position only; it is not a load lock. Speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X250-100TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X250-100TC replacement — usually within 7-8 hours.