Specifications: SAI200BX643CA — SAI series double-acting single-rod cylinder; 200 mm bore × 643 mm stroke; SUS304 rod (B); non-magnetic piston; single rear clevis (CA); TPU seals; PT3/4 ports.
Product Catalog
Download Airtac Product Catalog (PDF)
For detailed product dimensions and mounting drawings, please download and refer to the PDF catalog.
SI to SAI replacement guide
Model Code Explained
| Code |
Meaning |
| SAI |
Standard double-acting single-rod cylinder |
| 200 |
200 mm bore |
| B |
SUS304 stainless steel |
| X |
Separator before stroke |
| 643 |
643 mm stroke |
| No magnet suffix |
Without built-in magnet |
| CA |
Single rear clevis |
| No seal suffix |
TPU seal option |
| No thread suffix |
PT3/4 working ports |
Technical Specifications
| Parameter |
Value |
| Model |
SAI200BX643CA |
| Action |
Double acting, single rod |
| Bore |
200 mm |
| Stroke |
643 mm; Special stroke; confirm order and delivery conditions |
| Piston rod material |
SUS304 stainless steel |
| Magnetic piston |
Without magnet |
| Mounting selection |
Single rear clevis |
| Seal option |
TPU |
| Working ports |
PT3/4; two working air ports |
| Working medium |
Air filtered to 40 µm or finer |
| Operating pressure |
0.15–1 MPa (1.5–10 bar; approximately 22–145 psi) |
| Proof pressure |
1.5 MPa (15 bar); not continuous operating pressure |
| Temperature |
-20 to 70 °C; apply the complete system limits |
| Piston speed |
30–500 mm/s |
| Stroke tolerance |
+1.5 / -0 mm |
| Cushioning |
Adjustable pneumatic cushion; 50 mm nominal cushion reference |
| Rod diameter / end thread |
40 mm / M36×2.0 |
| Cylinder reference weight |
33227.56 g; catalog calculation, not measured shipping weight |
Reference weight = 13667.5 + 30.42 × 643 g, decimal grams, from the matching non-magnetic SAI single-rod base. A/B rod and H/N seal mass differences are unquantified: not certified variant mass. Excludes brackets, rod joints, sensors and packaging; actual weight prevails.
The 50 mm nominal cushion distance does not guarantee usable deceleration length for shorter strokes. Verify actual load/speed performance.
Features and Operation
ISO15552 standard cylinder, formerly ISO6431.
Compact special-shaped bidirectional piston sealing structure with oil storage.
Corrosion-resistant profiled aluminium tube; no tie rods; external sensor grooves.
Stable adjustable pneumatic cushioning.
Multiple cylinder variants and mounting accessories available.
External and Mounting Dimensions
A+stroke ends at rear-cover face; overall formulas add rear boss NA once. Bare body excludes accessories, sensors, joints and packaging. Magnetic/nonmagnetic dimensions match. Drawing-specific symbols are not extra overall dimensions. Numbers are mm; threads are explicit. For detailed product dimensions and mounting drawings, please download and refer to the PDF catalog.
| Basic dimension / drawing symbol |
Dimension (mm) / thread |
| Illustrated A + stroke to rear-cover face |
990 mm = 347 + 643 |
| Body face span: AC + stroke |
823 mm = 180 + 643 |
| Derived bare retracted length: A + stroke + NA |
995 mm = 347 + 643 + 5 |
| Derived bare extended length: A + 2 × stroke + NA |
1638 mm = 347 + 2 × 643 + 5 |
| Body cross-section |
220 × 220 mm |
| Base drawing symbols |
A=347 mm before adding the actual stroke;AB=167;AC=180 mm before adding the actual stroke;AD=50;AE=50;B=220;D=40;DA=100;E=M36×2.0;EA=72;F=55;FA=18;M=75;MA=67;H=36;K=M16;KA=35;KB=175;N=75;NA=5;P=PT3/4;PA=25;PB=15 |
Selected Mounting Dimensions
| Accessory / drawing symbols |
Dimension (mm) / thread |
| CA — Single rear clevis; F-SI200CA |
A + stroke=990 = 347 + 643;C + stroke=823 = 180 + 643;S=220;T=175;DC=60;DD=30;DE=30;DJ=37;DQ=89.7 |
Mounting and Rod-End Accessories
| Mounting option |
Part code and material |
| LB — Axial foot mounting |
F-SI200LB; Ductile cast iron |
| FA — Front flange mounting |
F-SI200FA; Ductile cast iron |
| CA — Single rear clevis |
F-SI200CA; Ductile cast iron |
| CB — Double rear clevis |
F-SI200CB; Ductile cast iron |
| CR — Single clevis connection |
F-SI200CR; Ductile cast iron |
| TC — Intermediate trunnion mounting |
F-SI200TC; Ductile cast iron |
| FTC — Front-cover trunnion mounting |
F-SI200FTC; Ductile cast iron |
| TCM1 — Trunnion support type 1 |
F-SI200TCM1; Ductile cast iron |
| TCM2 — Trunnion support type 2 |
F-SI160TCM2; Aluminium alloy |
| FB — Rear flange mounting |
F-SI200FA; Ductile cast iron |
FA/FB share a flange plate at different positions. CR requires CB. TC/FTC need the listed TCM1/TCM2: support size numbers may differ from bore. Confirm package and fasteners.
TC is factory-fixed for this bore: no arbitrary position adjustment or direct installation of a separate TC on a standard barrel. Confirm factory mounting/support position. No TC locking-torque or static holding-force value is established here.
Drawing holes: LB 4 AP; FA/FB 4 BP; CR 4 K through-holes and 4 L counterbores; TCM1 4 E; TCM2 4 L through-holes and 4 K counterbores. CA DQ/CB CP tolerance: ±0.1 mm. Hole counts do not specify supplied fastener quantities.
Rod-End Joint Dimensions
| Joint / drawing symbol |
Dimension (mm) / thread / angle |
| I joint — F-M36X200I |
NC=35;ND=144;NE=181;NF=65;NG=55;NH=M36×2;NM=35;Reference weight=2176 g |
| Y clevis joint — F-M36X200Y |
NA=70;NC=35;ND=144;NP=73;NQ=179;NM=35;NH=M36×2;PA=80.2;PB=70.8;Reference weight=3083.8 g |
| Floating joint — F-M36X200F |
MA=194.5;MB=60;MC=20.5;MD=77.5;ME=84;MF=54;MG=18;MH=36;MI_MJ=M36×2;MK=5°;Reference weight=4126 g |
| Spherical rod-end joint — F-M36X200U |
PA=27.5;PB=80;PC=35;PD=56;PE=125;PF=165;PG=M36×2;PH=15°;PI=57.5;PJ=50;PK=43;Reference weight=1664 g |
M36×2.0 rod joints use the carbon-steel catalog category; subparts/finishes are unspecified. Select joints/guides for load. Joint mass is excluded from cylinder weight. Y drawing: no separate pin-kit code or guaranteed kit count.
Service References — Confirm Exact Revision
| Parameter |
Value |
| TPU seal-set reference |
P-SAI200-R1 |
| NBR seal-set reference |
P-SAI200N-R1 |
| Fluororubber seal-set reference |
P-SAI200-R2 |
| Magnet-ring reference |
GMEB184X196X6 |
| Guide-ring reference |
SAI200 grooved wear-resistant guide ring associated with the magnet ring |
Confirm revision, dimensions, material and fit for these original service references; interchangeability is unverified. Cover names are not order codes; seal alternatives are not all fitted.
Non-magnetic cylinder: magnet/guide-ring references imply neither a fitted magnet nor approved magnetic conversion.
Force and Application
| Parameter |
Value |
| Extension effective area |
31416 mm²; catalog rounded single-rod area |
| Extension at 0.5 MPa |
15708 N theoretical |
| Retraction effective area |
30157 mm²; catalog rounded single-rod area |
| Retraction at 0.5 MPa |
15078.5 N theoretical |
Theoretical axial force = effective area (mm²) × pressure (MPa), before friction/losses. Rod area reduces retraction area. Not safe working loads or guaranteed payloads.
Installation and Maintenance
Qualified personnel only. Before maintenance: secure loads, guard motion, isolate power/air and release residual pressure. Prevent unexpected restart motion; design for power/air loss.
Use clean, dry air filtered ≤40 µm; remove water, degraded oil and debris. Protect from dust, corrosion, coolant, weld spatter, vibration, heat and freezing; assess unusually dry air. Strong magnetic fields affect sensing.
Start unloaded; increase load gradually. Align rod/load; guide against side load, bending, impact and torque. Check long-stroke buckling, sag, support and air use. Rod joints do not replace guides.
Load-ratio guidance: ≤0.7 static/low speed; ≤0.5 at 50–500 mm/s; ≤0.3 above 500 mm/s. Not structural safety factors or payload guarantees; obey cylinder pressure/speed limits.
Fit flow controls at both ports; double action normally uses meter-out. Start closed; open gradually. Set cushions for load/speed without forcing screws. Heavy/fast loads may need an external absorber or deceleration circuit.
Compressibility/leakage defeat assumed precise prolonged closed-center stops or automatic multi-cylinder synchronization. Swing links need CA/CB/TC pivots, not rigid LB mounts forced through arcs. Match flange direction/support height to load.
Normally no added oil is needed. Once introduced, continuously use additive-free ISO-VG32 turbine oil. Oil-mist guide: ≤25 mg/m³; 0.5–5 drops per 1000 L. Size lubricator for flow; avoid excess/incompatible oil.
Clean pipes; keep sealant off leading threads. Start required tape 1.5–2 threads back. Verify tube pressure/temperature, OD/ID and bend radius. Hot spatter may require metal/flame-resistant tubing.
Protect sliding surfaces; periodically operate stored cylinders and prevent corrosion. Use the lowest cylinder/fitting/valve/tube/sensor/cable limit; temperature options do not raise other ratings.
PT3/4 mating piping-thread tightening reference: 28–30 N·m. This is not a G/NPT thread, TC clamp or sensor torque specification.
Internal Components — SAI Catalog Reference
| Item |
Material reference |
| 1. Nut |
Carbon steel / stainless steel |
| 2. Piston rod |
S45C hard-chrome-plated ground bar / stainless steel |
| 3. Front-cover O-ring |
TPU |
| 4. Front cover |
Aluminium alloy |
| 5. Bushing |
Wear-resistant material |
| 6. Cushion O-ring |
TPU |
| 7. Barrel |
Aluminium alloy |
| 8. Piston-rod O-ring |
NBR |
| 9. Piston |
Aluminium alloy |
| 10. Piston O-ring |
NBR |
| 11. Wear ring |
Wear-resistant material |
| 12. Magnet |
Not fitted in this non-magnetic cylinder. Catalog magnetic-version reference: Plastic type for bores100 and below; rubber type for other bores |
| 13. Hexagon socket bolt |
Carbon steel |
| 14. Cushion seal |
TPU |
| 15. Rear cover |
Aluminium alloy |
| 16. Support screw cap |
Carbon steel / stainless steel |
SAI structure reference, not an option material certificate. Ordered rod/seal choices prevail: A/B is not an all-stainless cylinder; a seal option does not replace every elastomer.
Series Ordering Options
| Parameter |
Value |
| Rod material choices |
Blank: Medium-carbon steel; A: SUS420J2 stainless steel; B: SUS304 stainless steel |
| Seal choices |
Blank: TPU; H: Fluororubber; N: NBR |
| Magnet choice |
Blank: no magnet; S: magnet fitted, sensors separately selected |
| Thread choices |
PT, G or NPT as specified by the actual order; do not mix thread standards |
| Catalog standard strokes |
25, 50, 75, 80, 100, 125, 150, 160, 175, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1000 mm |
| Maximum / allowable stroke |
1500 / 2000 mm; separate catalog limits, not a list of all standard strokes |
| Stroke tolerance bands |
0–250 mm: +1 / -0 mm; 251–1000 mm: +1.5 / -0 mm; 1001–1500 mm: +2 / -0 mm; above 1500 mm not specified |
Series alternatives are not simultaneous features. Confirm special strokes/unlisted combinations. Retain the full model; separately select mounts, joints, sensors and circuit parts.
Magnetic Sensing
This model has no built-in magnet. DMSE and CMSE magnetic sensors are not applicable to this piston as ordered; adding a sensor does not add a magnet. A separately confirmed magnetic cylinder configuration is required for magnetic detection.
Separate Upstream Air Preparation
| Complete ordering example |
Port, bowl and reference data |
| GAFR50020S |
two female PT3/4 ports; PC bowl, 108 cm³; 950 g catalog reference; gauge MPa/psi |
| GAFR600C20S |
two female PT3/4 ports; Metal bowl, 205 cm³; 1880 g catalog reference; gauge MPa/psi |
Separate upstream filter/regulators, not male cylinder fittings or included parts. The 500 has a PC bowl; 600C has a metal bowl. These complete examples retain their bowl and thread codes.
Compressed air; 40 µm filter; differential/manual drain, bracket and round gauge; no reverse-flow valve. Inlet ≤1 MPa; proof 1.5 MPa is not working pressure; regulation 0.15–0.9 MPa; −5 to 70 °C, non-freezing.
Select separate correct male connectors for both IN/OUT; check flow/pressure loss, drainage, bowl environment and downstream ratings. Not a vacuum regulator or a guaranteed speed selection.
A complete direct 3/4-inch fitting/control/plug/exhaust-silencer pool, a verified 3/4-to-1/2 adapter chain and a complete 16 mm tube-end path are not established here. Do not install a 1/2-inch male item directly in a 3/4-inch cylinder port or invent ordering suffixes. This is a documentation boundary, not a claim that such products are unavailable.
Connect both cylinder working ports through an independently selected complete path; match actual PT/G/NPT standards and seals. Exhaust silencers belong on the selected valve exhaust, not the cylinder ports. Never bridge the two chambers.
The SAI pressure intersection with these regulators is 0.15–0.9 MPa; the general-temperature intersection is −5 to 70 °C before lower component limits.
Separate Valve, Tube and Sizing Selection
No bore-specific valve/tube or speed-flow example is established here for this bore. Select separately from actual flow, pressure, temperature, thread, tube OD/ID, load and exhaust conditions; a smaller-bore example is not a validated substitute.
Use the catalog above for dimensions, mounting drawings and symbol positions. Before installation, check full configuration, space and separately selected accessories.
