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The Smith-Blair Style 411 steel coupling with 304 stainless steel bolts and nuts joins plain-end steel pipe from 1/2 in to 48 in without threading, welding, or special pipe-end preparation. The SS304 bolting configuration carries factory catalog suffix -031 and is otherwise identical to the standard coupling: fabricated steel middle ring, ductile iron followers, and Grade 27 SBR gaskets. Type 304 hardware resists atmospheric and buried-service corrosion far beyond coated alloy bolting, at a lower cost than 316.
Select the nominal size, pipe OD, and sleeve configuration below. Engineering-led sizing support is available for transition and gap-spanning applications; a factory submittal is provided with every order on request.
| Style | 411, SS304 bolts and nuts (suffix -031) |
| Service | steel pipe, 1/2 in to 48 in |
| Middle ring | Fabricated steel, fusion epoxy coated |
| Bolting | 304 Stainless Steel track-head bolts and heavy hex nuts |
| Gaskets | Grade 27 SBR, NSF-61 compounds available |
Need a submittal, a different bolt configuration, or help selecting the correct OD range? Email sales@watermainsupply.com or call 281.664.8000.
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