MKS/HPS 100310311 ISO‑KF Weld Stub Flange – LOT OF 2

The MKS HPS Series 31 model 100310311 is a short weld-stub flange designed for vacuum systems, offering a ¾″ (0.75 in) tube outside diameter (OD) and a NW16 / ISO-KF (also known as KF-16) interface. Constructed from 304-grade stainless steel, it is ideal for attachment via butt-weld to stainless tubing, enabling high-vacuum or subatmospheric setups.

Key Specifications

• Flange Size: NW16 (ISO-KF / KF-16 interface)

• Tube OD: 0.75 in (19.05 mm)

• Stub Length: 0.50 in (12.7 mm)

• Wall Thickness of Stub: 0.065 in (≈1.7 mm)

• Material: 304 Stainless Steel

• Series: HPS / Series 31 ISO-KF vacuum fittings

• Interface style: ISO-KF “sexless” flange design, allowing rotatable assembly with a centering ring and clamp.

• Applications & Use-Case

  This weld stub flange is ideally suited for laboratories, research institutions, industrial vacuum plumbing, and specialty equipment setups where:

  • A ¾″ OD stainless tube needs to be welded into a vacuum system with a KF-16 flange interface.

  • Modular vacuum systems require quick interchangeability of components using ISO-KF standard parts.

  • Space-constrained flange lengths are beneficial (short stub design).

  • Maintenance, calibration, or retrofitting of vacuum systems demands high-quality stainless steel components with standardized sealing interfaces.