LDS Vacuum NW50‑200‑SR‑B Centering Ring

This is a centering ring used in NW50 (also called KF50 or QF50) high‑vacuum flange systems — common components in vacuum chambers and vacuum plumbing. It’s made of stainless steel and includes a Buna‑N (nitrile) O‑ring to seal between two mating NW50 flanges.

🔩 Function

• The centering ring positions and supports the elastomer O‑ring between two vacuum flanges so that when the clamp is tightened, the O‑ring is compressed uniformly and creates a vacuum seal.

📏 Size / Compatibility

• Designed for NW50 / KF50 / QF50 standard vacuum flanges, which have an outer diameter of about 2.95″ (≈ 75 mm).

• The “200” in the part number refers to the series size (NW50 category).

🧰 Construction

• 304 stainless steel ring: durable and corrosion‑resistant.

• Buna‑N O‑ring: a nitrile elastomer offering good sealing for general vacuum use up to moderate temperatures (~100 °C). Buna‑N is a common sealing material compatible with many vacuum applications.