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U.S. Solid's 304 Stainless Hex Nipple, Specification by Specification
This is a straight hex nipple — 1/2 inch NPT male thread on both ends — machined from 304 stainless steel bar stock rather than cast, sold by U.S. Solid both directly on ussolid.com and through Amazon under a large family of nearly identical hex-nipple listings covering many bore-size combinations.
U.S. Solid publishes a 6,000 psi pressure rating and a 1,000°F (537°C) maximum temperature rating for this part, with NPT threads cut to ASME B1.20.1 and SAE AS71051 standards; the company's own site additionally references ASTM A276/A182 material standards and ASME B31.3 piping-code compliance. U.S. Solid also states the fittings are lead-free and SGS-tested, and ships each nipple with plastic thread-protector caps.
These are manufacturer-published numbers — we did not locate an independent, third-party pressure or burst test specific to this SKU. U.S. Solid is a reasonably established industrial-fitting brand with its own e-commerce site and broad product catalog (not just a marketplace-only listing), which is a modestly positive trust signal versus a pure private-label product, but it isn't a substitute for per-lot third-party certification if your application requires that documentation.
304 stainless is a solid general-purpose alloy for corrosion resistance and strength versus brass or black iron, but it isn't the same as 316 stainless, which handles chloride-rich or highly corrosive environments (some marine or chemical-processing settings) better. Buyers with those specific needs should confirm whether 316 is required instead. It's also worth remembering that NPT nipples of any material rely on thread sealant or PTFE tape for the actual pressure seal — the fitting's rating describes the metal's strength, not a pre-applied seal.
Because U.S. Solid sells this same design across many bore combinations (1/4", 3/8", 1/2", 3/4", 1", and reducing combinations between them) under separate but visually similar Amazon listings, it's easy to click into the wrong size or a reducer instead of a straight nipple. Double-check the exact ASIN and both thread sizes before ordering, especially when buying multiples for one project.
Key Listed Features
304 stainless steel bar-stock construction (not cast) for strength and corrosion resistance
Rated to 6,000 psi and up to 1,000°F / 537°C per the manufacturer
NPT threads machined to ASME B1.20.1 / SAE AS71051 standards
Lead-free and SGS-tested per manufacturer claims
1/2" x 1/2" male NPT on both ends — a straight hex nipple, not a reducer
Ships with plastic thread-protector caps on the male threads
