Rexroth0 822 122 008Profile Pneumatic Cylinder, ISO 15552, 50 mm Bore, 250 mm Stroke, Double-Acting, Magnetic Piston, Adjustable Cushioning

Product Description

What this part is

Bosch Rexroth 0822122008, a double-acting profile pneumatic cylinder to ISO 15552, series PRA. Aventics designation PRA-DA-050-0250-0-2-2-1-1-1-BAS. Piston Diameter: 50 mm. Stroke: 250 mm. Piston Rod Diameter: 20 mm. Piston Rod Thread: M16 x 1.5, external. Port Size: G1/4, internal thread. Working Pressure: 1.5 to 10 bar. Cushioning: pneumatic, adjustable, with elastic end cushioning. Piston: magnetic. Weight: 2.24 kg. Overall Body Length: 356 mm.

Decoding the order code

0822122008 — Bosch Rexroth material number. Within the PRA table, 0822122xxx is the 50 mm bore column and the trailing 008 is the 250 mm stroke row.

PRA — Rexroth’s ISO 15552 profile-barrel standard cylinder range.

DA — double-acting.

050 — piston diameter in millimetres.

0250 — stroke in millimetres.

BAS — the base execution of the range, magnetic piston with adjustable pneumatic cushioning at both ends.

What these specs mean in practice

Extending Piston Force at 6.3 bar: 1235 N. Retracting Piston Force at 6.3 bar: 1035 N. Rexroth quotes PRA forces at 6.3 bar rather than 6 bar, so these figures sit slightly above the equivalent 6 bar numbers for the same bore.

Cushioning Length: 17 mm. Cushioning Energy: 15 J. That energy figure is the useful selection number — it sets how much moving mass the cylinder will stop at a given velocity without an external shock absorber.

Maximum Stroke for the 50 mm Bore: 2100 mm. Working Pressure: 1.5 to 10 bar. Ambient Temperature: −20 to +80 °C. Medium Temperature: −20 to +80 °C.

Medium: compressed air. Maximum Particle Size: 50 µm. Oil Content of Compressed Air: 0 to 5 mg/m³, held constant over the life of the cylinder. Pressure Dew Point: at least 15 °C below ambient and medium temperature, and no higher than 3 °C.

Material, Cylinder Tube: anodised aluminium. Material, Piston Rod: stainless steel. Material, Front Cover and End Cover: die-cast aluminium. Material, Seal and Scraper: polyurethane. Material, Piston Rod Nut: galvanised steel.

An ATEX execution of this cylinder is published under ATEX ID II 2G2D c T4 T135 °C with an ambient range of −20 to +60 °C.

Mounting data

Body Length at 0 mm Stroke: 106 mm ±0.7. Rod Extension Beyond the Front Cover: 37 mm. Piston Rod Thread Length: 32 mm. Across Flats on the Rod: 17 mm. Spigot Diameter: 40 mm to d11. Spigot Length: 16 mm. End Cap Width: 65 mm. Tie-Rod Thread: M8. Cover Tapped Hole: M10. Mounting Hole Centre Distance: 46.5 mm ±0.6. Port Centre Offset PL: 19 mm. L2: 25 mm. Piston Rod Diameter Tolerance: 20 mm f8.

The barrel carries ISO 15552 sensor grooves, so magnetic proximity switches mount flush along the body. Standard ISO 15552 accessories for the 50 mm bore — foot, front and rear flange, rear clevis, trunnion, rod clevis and rod eye — fit this envelope.

Quantity and configuration

Unit Quantity: 1 Pc. Cylinder only.

Interchange guidance

The mounting interface, G1/4 ports, 20 mm rod and M16 x 1.5 rod thread are the ISO 15552 standard for a 50 mm bore, so a Festo DNC-50-250-PPV-A, an SMC C96SB50-250C, a Norgren PRA/182050/M/250 or a Parker P1D-B050MS-0250 fits the same brackets and porting. The figures that differ between makers at this bore are the pressure ceiling, the cushioning energy and the seal material. Within the Rexroth table, 0822122007 is the same cylinder at 200 mm stroke and 0822122009 at 320 mm; 0822121008 is the 40 mm bore at 250 mm stroke and 0822123008 the 63 mm bore at 250 mm.