254 SMO Stud, nut & washer sets
ASME B18.31.2ASTM A276
254 SMO stud, nut and washer sets carry the connection from tensile member to bearing surface. High-molybdenum austenitic resistance to chloride exposure must be matched by suitable nut engagement and washer bearing strength.
- MOQ
- 100PCS
- Samples · typical
- ~20 days
- Production · typical
- 25–35 days
- Heat treatment
- Solution annealed
EN 10204 3.1 MTC + heat-number traceability
Which standard is on your order?
Raw Material Specifications
Threads · Metric
Threads · Inch
Dimension Reference
Heat Treatment
Solution annealedSolution annealing and rapid cooling retain alloying elements in solution and restore the specified corrosion-resistant condition.
What we can make in 254 SMO
Stud
Include both washers when calculating the clamped stack and usable stud projection. Their thickness can change the stud length needed to engage both nuts.
Nuts
Pair the nut grade, proof load and thread fit with the stud for the intended clamp load. Heavy-hex nuts also need enough radial clearance for the installation socket.
Washers
Use washers to provide the specified bearing footprint or replaceable seating surface. Bore clearance must accommodate the stud, while thickness must support the opening beneath the washer.
- Grade pairing
- Stud + two nuts + washers
- Grade pairing
- Metric · UNC · UNF · 8UN · UNJ
- Grade pairing
- Component-by-component grades
- Grade pairing
- Heat and batch identification
- Final condition
- Solution annealed
- Inspection
- Component count · Mating thread fit · Individual dimensions
Manufacturing route
Studs, nuts and washers are manufactured and inspected as separate components before the specified quantities are packed as a set.
Heat treatment & final condition
The final annealed or specified strengthened condition is linked to the lot; an aging treatment is not assumed for a solid-solution alloy.
Finished geometry
Thread engagement, nut pattern and component grades are checked together. Each component retains its heat or batch identity in the set documentation.
Where 254 SMO fits — and what matters
Offshore & Marine
Seawater pump and cooling-system covers254 SMO stud, nut & washer sets bring the studs, mating nuts and specified bearing washers together for seawater pump and cooling-system covers. The washer stack is included in the required usable stud length. The assembled contact is exposed to saltwater, deposits and neighbouring metals.
Water Treatment & Desalination
Filter housings and treatment-pump covers254 SMO stud, nut & washer sets bring the studs, mating nuts and specified bearing washers together for filter housings and treatment-pump covers. The washer stack is included in the required usable stud length. The water stream, cleaning cycle and retained liquid define exposure at the installed part.
Oil & Gas
Process valves and equipment closures254 SMO stud, nut & washer sets bring the studs, mating nuts and specified bearing washers together for process valves and equipment closures. The washer stack is included in the required usable stud length. Utility connections and pressure-boundary parts have separate acceptance requirements on the equipment drawing.
Same stud, nut & washer set. Different material priorities.
254 SMO material dataInconel 625
Solid-solution strength and resistance to aggressive process liquids.
- Connection priority
- Stud tension, nut engagement and washer bearing
- Annealed or solution-annealed 625
- The delivery condition affects strength and high-temperature response. Keep the specified condition with the component’s mechanical acceptance; 718-style aging is not the strengthening route for 625. Include liquid retained at the stud–nut threads and both washer-bearing interfaces in the exposure description.
Super Duplex 2507
Super-duplex strength and resistance to chloride pitting.
- Connection priority
- Stud tension, nut engagement and washer bearing
- Final duplex structure
- S32750 chemistry and final solution treatment belong together. Forming, section size and cooling affect the structure represented by the mechanical and corrosion records. Include liquid retained at the stud–nut threads and both washer-bearing interfaces in the exposure description.
Monel K-500
Age-hardened strength in the nickel–copper alloy family.
- Connection priority
- Stud tension, nut engagement and washer bearing
- Strength and hydrogen exposure
- K-500 gains strength through aging. Cathodic protection, hydrogen exposure and the ordered condition need joint consideration in highly loaded marine components. Include liquid retained at the stud–nut threads and both washer-bearing interfaces in the exposure description.
From drawing to documented delivery
- 01Drawing & BOMForm, dimensions and quantity
- 02Material & formingGrade, heat and manufacturing route
- 03Final inspectionGeometry, threads and ordered tests
- 04Documents & dispatchLot records and identified packing
Order documents
- Material identity
- UNS S31254 · heat number · ordered condition
- Final-part acceptance
- Grade chemistry, supplied condition and ordered mechanical requirements.
- Dimensional record
- Component count · Mating thread fit · Individual dimensions
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your 254 SMO stud, nut & washer set enquiry
Questions about 254 SMO stud, nut & washer sets
Can all components be accepted from the stud certificate?
Each component has its own job and material lot. The nut needs thread and strength acceptance, and the washer needs bearing geometry and the ordered condition; retain those records with the stud’s documentation.