Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 170mm 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
- Stroke170 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-30S
The AirTAC SAIJ125X170-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 140 to 170 mm. It delivers 6136 N of push force at 0.5 MPa and features a robust 32 mm carbon steel rod with an M27x2 thread, paired with 40 mm variable air cushions at both ends to manage high kinetic energy. The integrated magnet (-S) enables precise position detection.
Instead of relying on fixed stops, the rear adjustment screw allows you to fine-tune the retract end position during commissioning or product changeovers without swapping the cylinder. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting, and the PT tapered port threads ensure a reliable pneumatic seal.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 170 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 SAIJ125X170-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×170 | 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 SAIJ125X170-30S Is Used
Product Changeover
Dial in the 140-170 mm retract position during format size changes on a packaging line without physically swapping out the entire actuator.
Machine Setup
Fine-tune the end-of-stroke stopping point during initial commissioning to achieve exact mechanical alignment against heavy workpieces.
Variable End Stops
Provide adjustable physical limits for automated clamping or pressing stations where the precise contact distance varies between runs.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X170-30S the Right Cylinder?
Choose this 125 mm bore when an 80 mm bore (delivering 2513 N push at 0.5 MPa) lacks the thrust for your heavy payload, but a 160 mm bore is physically oversized. The adjustable 140-170 mm travel window is perfect for applications requiring variable end-stops or exact positioning that a fixed-stroke SAI cannot accommodate. Since the stroke is 170 mm, the 32 mm rod handles standard side loads well, though external guides should always support the payload to prevent binding.
When specifying a replacement, match the 125 mm bore, 170 mm nominal stroke, 30 mm adjustment range, PT port threads, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for fail-safe load holding, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125X170-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
A rear adjusting screw acts as a mechanical stopper, allowing you to shorten the effective stroke by up to 30 mm. This creates a usable travel window of 140 to 170 mm, enabling fine end-position tuning without external stops.
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Standard models usually ship in 3-4 days.
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