E99-350C44 - Miller Stainless Steel CGA 350 Nut - Hydrogen/Methane Service

Miller E99-350C44: Precision Stainless Steel CGA 350 Connection Hardware

The Miller E99-350C44 is a specialized stainless steel nut designed to meet the rigorous demands of industrial gas handling. Engineered specifically for the CGA 350 standard, this component is critical for establishing secure, leak-proof connections between gas cylinders and regulation equipment. The CGA 350 standard is designated primarily for flammable gases such as Hydrogen, Methane, Natural Gas, and Carbon Monoxide. Given the volatile nature of these media, the integrity of the connection hardware is paramount to facility safety and operational efficiency.

Constructed from high-grade stainless steel, this nut offers significant advantages over traditional brass counterparts. Stainless steel provides exceptional resistance to corrosion and environmental degradation, which is particularly important in industrial settings where equipment may be exposed to moisture, chemical vapors, or fluctuating temperatures. Furthermore, the material strength of stainless steel ensures that the threads maintain their integrity over repeated cycles of tightening and loosening, reducing the risk of thread galling or deformation that could compromise the seal.

The E99-350C44 features the standard CGA 350 thread profile, which is a .825"-14 NGO-LH-EXT specification. The "LH" denotes a left-hand thread, a safety feature mandated to prevent the accidental connection of fuel gas equipment to incompatible oxidizer or inert gas cylinders. This distinct threading ensures that operators cannot inadvertently mate a hydrogen regulator with an oxygen cylinder, thereby mitigating catastrophic risks. This nut is designed to work in conjunction with a compatible nipple to form a gas-tight seal against the cylinder valve outlet.

For maintenance, repair, and operations (MRO) professionals, utilizing OEM parts like the Miller E99-350C44 ensures compliance with safety standards and equipment specifications. Whether you are assembling a custom gas manifold, repairing a high-purity regulator, or replacing worn hardware on a welding cart, this stainless steel nut delivers the reliability required for handling high-pressure flammable gases. Its robust construction supports high-pressure applications and maintains structural stability under the mechanical stress of torque and internal gas pressure.