ASTM F594 Stainless Steel Nut | Marine Hexagon Nut
TheASTM F594 Stainless Steel Nut is the standard nut hexagonal fastener for marine and shipboard applications where corrosion resistance is non-negotiable.
Manufactured to ASTM F594 specification, these hexagonal nuts cover austenitic grades A2 (304) and A4 (316), plus duplex alloys
— delivering reliable clamping force in engine rooms, deck equipment, ballast piping, and hull structural connections.
Unlike carbon steel alternatives, every ASTM F594 Stainless Steel Nut maintains its mechanical integrity in salt-laden air and intermittent seawater immersion.
The standard hexagon nut geometry accepts all common wrenches and sockets, while the precision Class 6H thread ensures smooth engagement with machine bolts and studs.
Pair with A193 B8 stainless studs as a complete screw nut assembly for flanged piping joints.
| Product Name | ASTM F594 Stainless Steel Nut |
| Standard | ASTM F594 — Stainless Steel Hexagonal Nuts |
| Type | Hexagon Nut(standardnut hexagonalform) |
| Size Range | M3 to M48 metric coarse (UNC on request) |
| Grade A2-70 | 304 Stainless Steel — general marine, above-deck, cabin interior |
| Grade A4-80 | 316 Stainless Steel — seawater splash zone, deck exposed, galley |
| Grade Duplex | 2205 Duplex Stainless — submerged, ballast tank, desalination plant |
| Surface | Passivated per ASTM A967 — enhanced pitting resistance |
| Pair With | Stainless steel bolt / stud as screw nut assembly; A193 B8 / A193 B8M |
| Application | Hexagonal nuts (ASTM F594 Stainless Steel Nut) — ship flanges, deck machinery, engine mounts, piping, handrails |
| Inspection | Chemical composition traceable, mechanical properties per ASTM F606 |
Selecthexagonal nuts in grade A4-80 for any seawater-wetted connection
— the added molybdenum content in 316 stainless provides superior pitting resistance over standard 304 hexagon nutgrades.
For critical screw nut assemblies on engine room flanges subjected to thermal cycling, specify duplex 2205 ASTM F594 Stainless Steel Nut with matching B8M stud bolts.
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