The Problem You’ve Already Faced
- Genuine Festo or SMC — long lead time and high price. ISO 15552 exists precisely to allow any manufacturer to produce a compatible replacement. XCPC SI is a full equivalent with identical mounting and connection dimensions.
- The cylinder failed and the equipment is down. 50 mm bore and 300 mm stroke is one of the most widely used ISO 15552 sizes in industrial automation. We keep this size in permanent stock.
- Took a “similar” cylinder and it didn’t fit the fixture. ISO 15552 strictly normalises port spacing, mounting hole positions and rod thread length. Cylinders without ISO certification often deviate by 1–3 mm — enough for a clevis to misalign or a hose not to fit.
- Uncertain whether a magnetic piston is needed. XCPC SI-50×300-S is supplied without a magnetic piston (no -B suffix). If your system uses position sensors — specify this when ordering and we will source the magnetic version.
- Unclear which cushioning type to choose. The SI series has adjustable pneumatic cushioning at both end positions as standard — sufficient for the vast majority of industrial applications at 300 mm stroke.
Equipment downtime due to a cylinder failure costs many times more than a timely replacement.
What Is the XCPC SI-50×300-S Pneumatic Cylinder
XCPC SI is a series of standard industrial double-acting pneumatic cylinders manufactured by Ningbo Xinchao Automatization Component Co., Ltd. (China), conforming to ISO 15552. ISO 15552 replaced and unified VDMA 24562 and ISO 6431 — it is the single global standard for industrial pneumatic cylinders, defining all key mounting, connection and envelope dimensions.
Part number SI-50×300-S decoded:
| Field | Meaning |
|---|---|
| SI | Series: standard ISO 15552 cylinder (SI = Standard ISO) |
| 50 | Piston diameter: 50 mm |
| ×300 | Rod stroke: 300 mm |
| S | Rod end: external thread M16×1.5 |
The SI series is a direct functional equivalent of Festo DSBC, SMC C96, Camozzi 60M, Pneumax 1391, Norgren P1D, Parker P1D and other standard ISO 15552 cylinders. ISO 15552 compliance means the cylinder fits any of these without modifying fixtures, tubing or hoses.
Construction: anodised aluminium profile barrel, die-cast aluminium end caps, chrome-plated steel rod, self-lubricating sintered bronze or polymer rod guide bushing, NBR/PU piston and rod seals. Adjustable pneumatic cushioning at both end positions is series standard.
Technical Specifications
| Parameter | Value |
|---|---|
| Series | SI (ISO 15552) |
| Piston diameter | 50 mm |
| Rod stroke | 300 mm |
| Rod diameter | 20 mm |
| Acting type | Double-acting |
| Rod thread (end) | M16×1.5 external |
| Port thread (air) | G 1/4″ internal |
| Cushioning | Adjustable pneumatic (both end positions) |
| Magnetic piston | No (base version; magnetic version available on request) |
| Working pressure | 1–10 bar |
| Travel speed | 50–800 mm/s |
| Working medium | Filtered compressed air (lubricated or non-lubricated) |
| Ambient temperature | −20°C … +70°C |
| Mounting position | Any |
| Barrel material | Anodised aluminium (profile) |
| End cap material | Die-cast aluminium |
| Rod material | Chrome-plated steel |
| Seal material | NBR / PU |
| Extension force at 6 bar | ≈ 1,178 N (120 kgf) |
| Retraction force at 6 bar | ≈ 1,084 N (110 kgf) |
| Manufacturer | XCPC, Ningbo, China |
| Certification | CE, ISO 9001 |
💡 Expert tip: at 300 mm stroke and 50 mm bore, correct adjustment of the pneumatic end-of-stroke cushioning is critical. At speeds above 300 mm/s with rod loads over 5 kg — start with the cushion needle valve nearly closed and open gradually until smooth, impact-free stopping is achieved. Incorrect cushion setting is the primary cause of premature seal wear and end cap cracking on long-stroke cylinders.
Cross-Reference by Brand
| Brand | Cross-ref. part no. | Series | Standard | Rod thread | Ports |
|---|---|---|---|---|---|
| Festo (Germany) | DSBC-50-300-PPSA-N3 | DSBC | ISO 15552 | M16×1.5 | G 1/4″ |
| SMC (Japan) | C96SDB50-300 | C96 | ISO 15552 | M16×1.5 | G 1/4″ |
| Camozzi (Italy) | 60M2P050A0300 | 60M | ISO 15552 | M16×1.5 | G 1/4″ |
| Pneumax (Italy) | 1391.50.0300.01 | 1391 | ISO 15552 | M16×1.5 | G 1/4″ |
| Aventics (Germany) | R480193867 | PRA | ISO 15552 | M16×1.5 | G 1/4″ |
⚠️ Important: ISO 15552 guarantees mounting and connection dimension interchangeability. Always verify that the cylinder you are replacing actually has a magnetic piston (if position sensors are fitted) — the base XCPC SI-50×300-S is supplied without a magnet. The magnetic version carries the suffix -B.
5 mandatory parameters to verify compatibility:
- Piston diameter — 50 mm. Determines force output and all ISO 15552 mounting dimensions.
- Rod stroke — 300 mm. Exact stroke is critical for mechanism kinematics — not “approximately 300”, exactly 300.
- Rod thread — M16×1.5 external (suffix S). Confirm the eye, clevis or coupling matches this thread.
- Magnetic piston — if position sensors are in the system, specify the magnetic version when ordering.
- Mounting type — ISO 15552 supports multiple options: foot (LB), flange (FA, FB), clevis (CA, CB), trunnion (MF). Confirm that your equipment brackets match the chosen type.
Why Acvatron SRL — 5 Solid Reasons
Technical Selection and Compatibility Verification
The SI series is produced in bores from 32 to 125 mm, strokes from 25 to 2000 mm and several mounting configurations. We identify the exact configuration for your application and confirm fixture compatibility before dispatch.
Documentation (CE, datasheet, invoice)
Every cylinder ships with an invoice and CE declaration of conformity. For manufacturing enterprises — a full documentation package for asset registration.
Stock in Chisinau
The most frequently requested SI sizes (bores 32, 40, 50, 63 mm) and strokes are held in permanent stock. Same-day dispatch for orders placed before 14:00.
Alternative Selection When a Specific Part Is Unavailable
If SI-50×300-S is temporarily out of stock — we offer Camozzi, Pneumax or SMC equivalents to ISO 15552 with identical mounting dimensions, requiring no fixture modification.
Complete Pneumatics Stock
Valves, fittings, tubing, air preparation units, sensors, mounting accessories — complete pneumatic line equipment from one supplier.
Applications
Industrial Automation and Conveyor Systems
- Drives for lifting and rotating mechanisms
- Pushers and stops on conveyor lines
- Clamping and locking devices on assembly stations
Woodworking and Furniture Manufacturing
- Pressure beam and fence drives on panel saws
- Press fixture clamping systems
- Feed mechanism drives on machining centres
Metalworking and Mechanical Engineering
- Chuck and vice actuation drives
- Gate and slide valve control
- Auxiliary axis tool slide travel
Food and Packaging Industry
- Product stacker and transfer drives
- Slide gate valve control on process lines
- Dosing and filling mechanism drives
Construction and Road Machinery
- Tailgate and tipping mechanism drives (in pneumatic systems)
- Pneumatic lock and latch control
Expert Opinion
“The SI-50×300 is a workhorse of industrial automation. 50 mm bore at 300 mm stroke is a very common size, especially in woodworking and packaging. When replacing with XCPC SI I always check three things: does the old cylinder have a magnet, what mounting bracket type is it, and is the cushioning set correctly. Cushioning is the most frequent source of problems on long-stroke applications. People fit a new cylinder, leave the cushion untouched, and after 500,000 cycles a crack appears in the front cap — impact loading gradually destroys the aluminium. Cushion adjustment takes 10 minutes and multiplies cylinder service life.”
Vitalie Bolucevski, Chief Engineer, Acvatron SRL — 15 years in the industry
Applicable standards and certifications:
- ISO 15552 — standard pneumatic cylinders, mounting and connection dimensions (replaces VDMA 24562 and ISO 6431)
- EN ISO 10099 — pneumatic cylinders, test methods
- ISO 8573-1 — compressed air quality (class [7:4:4])
- CE Declaration of Conformity (Machinery Directive 2006/42/EC)
- ISO 9001 — XCPC quality management system
How to Select the Right Standard Pneumatic Cylinder: 6-Step Guide
- Calculate the required force. F (extension) = P × π × D²/4. At 6 bar and Ø50 mm = 1,178 N. Apply a safety factor of 1.5–2 and confirm this covers your load.
- Determine the exact stroke. 300 mm is a standard ISO 15552 size. For non-standard strokes — cylinders are produced from 25 to 2000 mm; confirm availability of the specific value.
- Select the rod thread type. Suffix S — external thread M16×1.5. Confirm the eye, clevis or coupling in your fixture is sized for this thread.
- Determine whether a magnetic piston is required. If position sensors are used — order the magnetic version (suffix -B). Without a magnet the sensor will not fire.
- Select the mounting type. Foot (LB), front/rear flange (FA/FB), clevis (CA/CB) — confirm the bracket type on your equipment.
- Adjust cushioning after installation. Start with the needle valve closed, open ¼ turn at a time until smooth, impact-free end-of-stroke stop is achieved. Correct adjustment multiplies cylinder service life.
FAQ
❓ What is the difference between XCPC SI and XCPC DNC — both are ISO 15552?
Both series conform to ISO 15552, guaranteeing identical mounting and connection dimensions. DNC is an older trade designation for the series (borrowed from Festo); SI is XCPC’s newer internal designation for the same constructive group. In practice both series are interchangeable and are selected by bore, stroke and configuration suffixes.
❓ How do I correctly adjust the pneumatic cushioning on an ISO 15552 cylinder?
Cushioning is adjusted via two needle valves — one at each end cap. Procedure: fully close the valve (clockwise to stop), run the cylinder at working speed and pressure, then open ¼ turn at a time until the piston stops smoothly without impact at the end position. For 300 mm stroke at 300–500 mm/s, typical valve position is 1–2.5 turns from closed.
❓ Where can I buy the XCPC SI-50×300-S pneumatic cylinder in Moldova?
The standard pneumatic cylinder XCPC SI-50×300-S (ISO 15552, Ø50 mm, 300 mm stroke, rod thread M16×1.5) is in stock at Acvatron SRL, Chisinau. Technical selection, compatibility verification and commercial offer — same day. Contact us at acvatron.md or WhatsApp.
