API ISO 15552 Series Pneumatic Cylinders
When it comes to selecting pneumatic cylinders for industrial automation, compliance with international standards isn't just a checkbox, it's a guarantee of interchangeability, safety, and long-term reliability. The API ISO 15552 Series from Advanced Pneumatic Industries (API) represents one of the most comprehensive and well-engineered ranges of standard pneumatic cylinders available on the market today, proudly manufactured in Italy to the highest quality benchmarks.
Whether you're specifying cylinders for a food processing line, a harsh outdoor installation, or a demanding heavy-duty press application, the ISO 15552 series offers a model, seal kit, and configuration to match. This guide walks through the entire product family — types, bore ranges, sealing options, configuration accessories, and the compliance credentials that make API a trusted choice for engineers worldwide.
What Is ISO 15552? Understanding the Standard
ISO 15552 is the internationally recognised standard governing the dimensions and operating conditions of detachable-mounting, pneumatic cylinders with bores from 32 mm to 320 mm. Cylinders built to this standard are interchangeable across manufacturers, making maintenance, replacement, and system upgrades far simpler than with proprietary designs.
API's ISO 15552 Series fully conforms to this standard across its entire product range, ensuring dimensional compatibility while adding engineering enhancements — such as adjustable cushioning, magnetic pistons, and an extensive suite of seal and configuration options — that go well beyond the minimum requirements of the standard itself.
Two Lines, Four Types — Find Your Fit
API structures its ISO 15552 Series into a Standard Line and a Premium Line, each available in two body configurations.
Standard Line: AMA & AMT Types (Ø 32–125 mm)
The Standard Line features light, powder-coated heads designed for general-purpose industrial use. The AMA type uses a profiled aluminium barrel with integrated "T" and "C" sensor grooves for direct magnetic reed switch mounting — no extra brackets needed. The AMT type offers the same performance in a classic round-tube-and-tie-rod construction. Both are double-acting, magnetic, and include adjustable end-of-stroke cushioning as standard.
Standard Line: Large-Bore AMT (Ø 160–320 mm)
For high-force applications such as presses, clamping systems, and heavy material handling, API extends the AMT type into a large-bore range up to Ø 320 mm. These big-bore cylinders maintain the same double-acting, magnetic, adjustable-cushioning feature set as their smaller counterparts — just with significantly greater thrust output.
Premium Line: BMA & BMT Types (Ø 32–125 mm)
The Premium Line upgrades to flat, heavy-duty heads for enhanced structural rigidity and a refined industrial aesthetic. The BMA type retains the profiled barrel with "T" and "C" sensor grooves, while the BMT type combines the flat-head construction with round tube and tie rods. Both types are the go-to choice where mechanical strength and build quality are paramount.
Seals for Every Environment
One of the ISO 15552 Series' greatest strengths is its sealing flexibility. The standard configuration ships with a PU/NBR full seals kit rated from −20°C to +80°C for long-life general use. Beyond that, API offers:
- Option V — FKM full kit for high temperatures up to +150°C and chemical exposure
- Option BT — Special PU kit for cold environments down to −40°C
- Option EC — Food-grade P5600/PU/NBR rod seal for food and beverage applications
- Option H / H1 — NBR seals for humid environments
- Option E8 — NBR/TPE rod seal for dirty and dusty conditions
- Option Y — Metallic rod scraper for harsh environments (combinable with V, H, and BT options)
- Option Z — Bellows rod protection for the most demanding installations
Configuration Options That Go the Distance
Every cylinder in the series supports an extensive list of factory configuration options, including stainless steel rods (Option K / K316), stainless steel tie rods and tubes (Options K1, K2, TX — for AMT/BMT types), female thread (Option F), through-rod (Option P), epoxy coating (Option EPX), and tandem arrangements (TA1–TA4) for doubled force or extended stroke. An ATEX version (/ATEX option) is also available for explosive-atmosphere installations.
API backs the series with a full range of ISO-standard mounting accessories (flanges, clevis brackets, trunnions, feet, hinges) and rod-end accessories (bearing heads, clevises, self-aligning couplings), plus magnetic reed switches, slide units, piston rod brakes, and valve mounting plates.
The Right Cylinder for Every Application
From general-purpose factory automation to ATEX-rated hazardous areas, food production lines, and heavy-duty high-force installations, the API ISO 15552 Series is engineered to cover it all within a single, standards-compliant product family. The combination of two distinct lines, four cylinder types, an extensive bore range, and unmatched sealing and configuration flexibility means engineers can specify confidently — knowing that performance, compliance, and long service life are all built in from the factory.
For full dimensional data, force tables, ordering codes, and the complete accessory range, check: API ISO 15552 Series Pneumatic Cylinders Brochure
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