Airtac SAIJ125 Adjustable Cylinder SAIJ125AX950-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX950-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 950mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke950 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX950-100S
The AirTAC SAIJ125X950-100-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. By turning the external stopper screw, you can dial back the nominal 950 mm travel by up to 100 mm, creating a precise 850-950 mm usable window. This allows you to fine-tune the retract end position during commissioning without swapping out the cylinder or adding external stops. It delivers robust force, generating 8590 N of push thrust at 0.7 MPa.
This variant features a SUS420J2 stainless steel rod (code A) for improved corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and because this is a -S model, it contains a magnet ready for AirTAC CMSE reed and DMSE electronic solid-state switches. The 125 mm bore utilizes a 32 mm rod and G1/2 ports, while the variable air cushions at both ends absorb kinetic energy over the long stroke.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX950-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX950-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 950 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / 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 | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125AX950-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×950 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX950-100S Is Used
Machine Changeover
Dial in the retract position up to 100 mm shorter to accommodate new product lengths on a packaging line without changing hardware.
Variable End Stops
Set precise 850 to 950 mm travel limits for heavy pallet handling without installing separate external mechanical stops.
Stroke Tuning
Fine-tune the final end position during equipment setup to dial in exact clamping or pressing distances on the fly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX950-100S the Right Cylinder?
Choose this 125 mm bore if you need heavy thrust beyond the 80 mm class (which provides 3518 N push at 0.7 MPa) but do not require the extreme 14074 N output of the 160 mm bore. The adjustable stroke is ideal for product-size changeovers on a line, letting you set a new end-stop on the fly. When matching an ISO 15552 replacement, specify the 950 mm stroke, 100 mm adjustment range, G1/2 PT ports, SUS420J2 rod, and the -S magnet.
Because the stroke is 950 mm, the 32 mm rod will experience leverage forces under side loading; an external guide is strongly recommended to prevent binding. Note that the rear adjuster acts purely as a travel stop and the air cushions handle deceleration, but neither will hold the load without live air pressure. For fail-safe load holding, use an SAIL pilot-locked cylinder, a BSAI clamp-lock, or an external rod lock. The mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX950-100S FAQ
At 0.7 MPa operating pressure, this 125 mm bore cylinder generates 8590 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 950 mm nominal stroke by up to 100 mm, providing an adjustable travel window of 850 to 950 mm. The adjuster and air cushions only control travel end and deceleration; they do not lock or hold the load without continuous air pressure.
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