Incoloy 825 Socket Head Cap Screws
ISO 4762ASTM B425
Incoloy 825 socket head cap screws fit recessed cover and mounting positions on acid-handling pumps, valves and chemical delivery equipment. Axial tool access keeps the surrounding envelope compact; the alloy is selected for the chemical exposure at the head, shank and engaged threads.
- MOQ
- 100PCS
- Samples · typical
- ~20 days
- Production · typical
- 25–35 days
- Heat treatment
- 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
AnnealedThe specified anneal restores ductility and the corrosion-resistant supplied condition after hot or cold working.
What we can make in Alloy 825
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
- 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 825 fits — and what matters
Chemical transfer pump casings
Incoloy 825 Socket Head Cap ScrewsSmall chemical-pump covers often have counterbored screw seats close to the casing wall. An 825 socket screw fits this compact arrangement and resists compatible acid leakage around the head. A clear axial tool path and enough socket depth make the screw serviceable after the surrounding pipework has been installed.
Connection requirements
- Counterbore diameter and depth
- Axial tool access
- Pumped acid and tapped-hole depth
Chemical dosing & chlorination skids
Incoloy 825 Socket Head Cap ScrewsChemical dosing skids combine small pumps and valve blocks in crowded layouts. 825 socket screws can retain removable housings exposed to compatible sulfuric-acid dosing solutions. The head needs a clean, fully supported seat; placing the recess away from a drip path reduces chemical accumulation in the drive.
Connection requirements
- Dosing chemical and concentration
- Head-seat dimensions
- Blind-hole engagement and screw length
Chemical delivery systems (CDS) & VMBs
Incoloy 825 Socket Head Cap ScrewsChemical delivery valve blocks leave little room around individual fasteners. Incoloy 825 socket screws offer axial access for cover and support connections exposed to compatible corrosive liquids. The alloy choice should follow the actual chemical line, while the screw length must stop short of the bottom of a blind tapped hole.
Connection requirements
- Delivered chemical and cleaning fluid
- Blind-hole depth and thread engagement
- Head clearance within the valve block
Same socket head cap screw. Different material priorities.
Incoloy 825 material dataHastelloy C-276 Socket Head Cap Screws
Hastelloy C-276 socket head cap screws fit compact chemical-pump and delivery-system attachments with restricted wrench access. Corrosion resistance matters at the loaded screw and liquid-retaining drive recess. Axial tooling reaches recessed holes near fittings and manifold hardware.
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.
254 SMO Socket Head Cap Screws
254 SMO socket screws suit compact wet-process covers where chloride exposure calls for more corrosion resistance than 316-type stainless. They provide access to recessed mounting points near pipework or adjacent castings. The head pocket's actual liquid exposure matters because deposits can remain after surrounding surfaces dry.
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 N08825 · 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 825 socket head cap screw enquiry
Questions about 825 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.