FESTO Standard Cylinder Selection Guide: DSBC vs DSNU vs ADN vs DSBG — A Quick Reference
2026-05-09
Cylinder selection can make or break a machine design. An undersized cylinder slows down cycle times. The wrong mounting style introduces side loads that wear seals prematurely. And using a non-standard footprint locks you into a single supplier.
FESTO offers four main standard cylinder series covering the vast majority of industrial linear motion requirements. This reference guide outlines the key differentiators, application windows, and SMC cross-reference equivalents.
Series Overview
| Series | Standard | Bore Range | Stroke Range | Best For |
|---|---|---|---|---|
| DSBC | ISO 15552 | 32-125 mm | 1-2800 mm | General linear motion, heavy loads |
| DSNU | ISO 6432 | 8-63 mm | 1-500 mm | Compact equipment, fixtures |
| ADN | ISO 21287 | 12-125 mm | 1-500 mm | Tight installation spaces |
| DSBG | ISO 15552 | 32-125 mm | 1-2800 mm | Guided, anti-rotation |
DSBC — ISO 15552 Standard Cylinder
The DSBC is FESTO’s highest-volume cylinder series, conforming to ISO 15552 (superseding ISO 6431 and VDMA 24562). This means dimensional interchangeability with SMC CP96, Norgren PRA/TRB, and other ISO 15552-compliant cylinders — no mounting hole modifications required for replacement.
Key specs: Double-acting, operating pressure 0.04-1.2 MPa, temperature range -20C to +80C, piston rod in high-alloy stainless steel. Cushioning: self-adjusting pneumatic (PPV) or manually adjustable (PPS).
Where DSBC stands out: die-cast aluminum end caps provide better flatness and seal consistency; piston rod lock nut included as standard; self-adjusting PPV cushioning adapts to load variations, reducing field commissioning time.
Typical applications: general machinery, packaging equipment, material handling, assembly lines. If you need a reliable standard cylinder with no special requirements, DSBC is the default choice.
DSNU — ISO 6432 Round Cylinder
DSNU features a round stainless steel barrel with threaded end caps per ISO 6432. At equivalent bore, DSNU weighs roughly 40-50% of a comparable DSBC. For cylinders mounted on moving structures (robot end effectors), weight savings translate to faster cycle times and reduced motor sizing.
DSNU offers modular configuration: barrel, piston rod seal, and cushioning components specifiable individually. Food-grade (FDA-compliant) and corrosion-resistant variants available.
Typical applications: small fixtures, laboratory equipment, medical devices, electronics assembly.
ADN — ISO 21287 Compact Cylinder
ADN compresses body height to a minimum — at 50mm bore, cross-section is roughly 45% lower than DSBC. Recommended maximum stroke: 500mm. Within this range, ADN is the go-to for tight spaces.
Key variants: ADN-S (integrated guide ring, 30% better lateral load resistance) and ADN-EL (electronic position feedback, IO-Link compatible).
Typical applications: robot end-of-arm tooling, semiconductor equipment, 3C electronics assembly.
DSBG — Guided Standard Cylinder
DSBG combines DSBC body with an integrated slide or ball bearing guide, maintaining ISO 15552 mounting compatibility. Factory-aligned guide assembly absorbs lateral loads several times the piston rod’s rated capacity. Refer to FESTO documentation for specific bending moment and torque ratings.
Typical applications: lifting mechanisms, clamping fixtures, conveyor pushers — any scenario with side loads or precise linear guidance requirements.
SMC Equivalents Quick Reference
DSBC ↔ SMC CP96: Both ISO 15552. Mounting dimensions fully interchangeable. DSBC offers more convenient cushioning adjustment; CP96 has more extensive high-cycle durability data.
DSNU ↔ SMC CM2/CG: Both round-body. Port specifications differ for certain bore sizes — verify dimension drawings when cross-referencing.
ADN ↔ SMC CQ2: Both ISO 21287 compact. CQ2 offers longer stroke options (some bore sizes to 1000mm). ADN has more flexible sensor integration.
DSBG ↔ SMC MG: Both guided cylinders. MG offers slightly better guiding precision below 32mm bore. DSBG holds the edge for heavy loads at larger bores.
Selection Decision Logic
Work through these priorities:
1. Installation space: Tight → ADN or DSNU. Ample → DSBC
2. Lateral loads: Present → DSBG or ADN-S. Pure axial → DSBC or DSNU
3. Standardization needs: Multi-brand interchangeability → ISO 15552 (DSBC) or ISO 21287 (ADN)
4. Stroke: Exceeds 500mm → DSBC or DSBG. Short-stroke precision → ADN
5. Environment: Cleanroom/food → DSNU special lubrication. Corrosive → variants available across all series
For specific load, speed, and cycle rate calculations, use FESTO’s online selection tools at festo.com. Cylinder selection seems straightforward, but the cost of fixing a wrong choice far exceeds the time spent on proper evaluation upfront.