254 SMO Socket Head Cap Screws
ISO 4762ASTM A276
254 SMO socket head cap screws suit compact covers and brackets exposed to chloride-bearing process water. Their axial drive fits closely spaced fasteners, while the six-moly austenitic alloy offers greater resistance to localized chloride attack than 316-type stainless in comparable conditions.
- 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
Partial thread
Use where a plain grip must span the clamped components. Match the under-head length and thread length so the screw tightens the stack before its thread runout reaches the tapped hole.
Full thread
Use for shorter component stacks and varied tapped-hole depths. The longer usable thread offers adjustment, while the screw end must clear the bottom of a blind hole.
- Drive
- Internal hex socket
- Length basis
- Under head
- Thread systems
- Metric · UNC · UNF · UNJ
- Assembly
- Tapped holes · Nuts
- Final condition
- Solution annealed
- Inspection
- Thread gauges · Head and shank dimensions
Manufacturing route
CNC machining suits samples and small lots. Cold heading or hot forging is selected for volume production according to alloy formability, head section and size.
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
Head geometry, bearing face, shank and thread fit are checked after the final machining and thermal operations.
Where 254 SMO fits — and what matters
Bleach-plant washers & mixers (ClO2)
254 SMO Socket Head Cap ScrewsSmall mixer access covers may place fasteners close to pipework or adjacent castings. 254 SMO socket screws allow tightening along the screw axis in these restricted spaces. The six-moly grade is useful in chloride-bearing bleach-plant exposure, with an accessible recess that can be cleaned before the key is inserted.
Connection requirements
- Bleaching and washdown chemistry
- Axial tool clearance
- Counterbore and tapped-hole depth
Submersible pump motor housings
254 SMO Socket Head Cap ScrewsWater-service motor housings often recess their cover screws to keep the outer profile clear. 254 SMO socket screws provide an austenitic option for chloride exposure. The head must bear fully in the counterbore, and the threaded tip must leave clearance at the bottom of a blind housing hole.
Connection requirements
- Water chemistry and temperature
- Head seat and blind-hole clearance
- Housing thread material
Chemical dosing & chlorination skids
254 SMO Socket Head Cap ScrewsDosing equipment has compact pump covers and mounting blocks with little space for a spanner. 254 SMO socket screws fit these close fastener patterns where the fluid and washdown exposure justify a six-moly grade. Screw length is particularly important on small housings with shallow tapped holes.
Connection requirements
- Concentrated dosing-fluid exposure
- Available tapped depth
- Recess access for maintenance
Same socket head cap screw. Different material priorities.
254 SMO material dataDuplex 2205 Socket Head Cap Screws
2205 socket screws suit compact pump covers and washdown mounts that need both strength and resistance to chloride exposure. Their heads fit recessed seats between surrounding equipment. The actual water chemistry and finished-screw properties establish the useful duty for this duplex option.
Super Duplex 2507 Socket Head Cap Screws
2507 socket screws are useful for compact saline-service housings that need higher strength and chloride resistance than common stainless fasteners. The cylindrical head fits a counterbore, and tightening is along the screw axis. The housing thread and head seat must be sized to carry the load available from the stronger screw.
Inconel 625 Socket Head Cap Screws
Inconel 625 socket head cap screws fit compact seawater housings and wet-process covers where liquid can remain beneath the head or inside the drive. Chloride pitting and crevice-corrosion resistance supports these exposed fastening points. Axial access suits recessed mounts between adjacent fittings.
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
- Thread gauges · Head and shank dimensions
- Traceability
- EN 10204 3.1 material certificate · production lot · identified packing
Build your 254 SMO socket head cap screw enquiry
Questions about 254 SMO socket head cap screws
What changes when the screw is stronger than the housing?
The housing thread can strip before the screw reaches its tensile capacity. The engagement depth and housing material therefore belong in the joint assessment alongside the screw’s final strength condition.