This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID125X25H, 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.
The AirTAC Airtac SID Double-Rod Cylinders SID125X25H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 25mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID125X25H, which matches its ISO interface, bore, stroke, force and mounting.
The AirTAC SID125X25H is a discontinued double-rod cylinder in the ISO 15552 SI family: a 32 mm rod exits both ends of the extruded aluminium barrel, so extension and retraction force are identical — 5734 N at 0.5 MPa, 8028 N at 0.7 MPa and 10321 N at 0.9 MPa — with none of the push/pull gap of a single-rod design. It is double acting only, with G1/2 ports, M27x2 rod threads, 40 mm adjustable cushions and a 30-500 mm/s speed range. The direct replacement is the SAID125X25H, which keeps the same bore, stroke, port pattern and FA/LB/TC/FTC/TCM1/TCM2 mounting dimensions.
The H suffix specifies Viton seals, and the SAID's piston seal design is further upgraded for lower friction and longer service life. Because rods project from both ends, the rear rod can carry a position cam or drive a second tool without adding a cylinder, and the symmetrical rods resist side-sway better than a single rod. Rod material is available as carbon steel (standard), SUS420J2 (A) or SUS304 (B) — confirm current options on the SAID datasheet.
| Model | Airtac SID Double-Rod Cylinders SID125X25H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID125X25H |
| Bore size | Ø125 mm |
| Stroke | 25 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 SAID125X25H carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAID125X25H produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×25 | 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).
The front rod pushes a loaded pallet into a machining station while the rear rod simultaneously returns the empty fixture to the loader — one 125 mm bore delivers an equal 5734 N push and pull, so no oversized return stroke is needed.
The front rod clamps a steel weldment at 5734 N while the rear rod carries an ejector pin that kicks the finished part clear on retraction — two functions from one cylinder, with the rear rod keeping the ejector perfectly in line.
To replace, order SAID125X25H — the conversion is simply inserting an A after the leading S of the model code, keeping the 125 mm bore, the 25 mm stroke and the option letter (here H for Viton seals). Size in both directions: since a double rod gives equal force both ways, check retraction loads too. If 5734 N at 0.5 MPa is marginal, step up to bore 160 (9425 N equal both ways) rather than adding a second cylinder; bore 100 (3681 N) suits lighter duty. A double rod is right when extension and retraction force must match, when the rear rod should carry a sensor cam or drive a second tool, or when a straight symmetrical pull is required. Mountings: Basic, FA, LB, TC, FTC, TCM1 and TCM2 — FB, CA, CB and CR are not offered in this family, though the ISO 15552 interface lets existing FA/LB/TC hardware stay in place. This model has no -S suffix, so no magnetic switches are fitted; order the -S variant for legacy CS1-B/DS1-B switch accuracy. Keep side loads on external guides — essential at strokes of 300 mm and above, and good practice even at 25 mm. Cushions only decelerate the piston near end of stroke; they cannot hold a load without live air, so use SAIL/BSAI or an external rod lock where a load must stay put. Speed range is 30-500 mm/s.
Replacement checklist
Yes, the SID line is discontinued. The exact replacement is SAID125X25H — insert an A after the leading S of the model code. The SAID keeps the same ISO 15552 interface, 125 mm bore, 25 mm stroke, G1/2 ports, M27x2 rod threads and FA/LB/TC/FTC/TCM1/TCM2 mountings, with an upgraded piston seal, so it bolts straight into the existing fixture and piping.
As a double-acting double-rod cylinder, extension and retraction force are identical: 5734 N at 0.5 MPa, 8028 N at 0.7 MPa and 10321 N at 0.9 MPa on the 125 mm bore with 32 mm rods. Cushions only decelerate the piston near end of stroke and do not hold a load without live air — use SAIL/BSAI or an external rod lock for held loads.
Send us the quantity and destination. We confirm price, stock and lead time on the SAID125X25H replacement — usually within 7-8 hours.