Incoloy 825 12-point flange bolts
ASME B18.2.5MASTM B425
Incoloy 825 twelve-point flange bolts suit connections with restricted tool indexing and a compact head envelope. The material contributes nickel–chromium–molybdenum–copper corrosion resistance; the drive profile and flange transmit installation torque and clamp load.
- 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
Fully threaded / Partially threaded
The difference is the plain shank. Fully threaded bolts have threads along the shank up to the head transition; partially threaded bolts retain an unthreaded grip section beneath the flange.
External head / Internal recess
The difference is where the tool engages. An external 12-point head is gripped around its outside by a matching socket. An internal spline recess is driven by a bit inserted into the head. These are different drive structures and should not be specified interchangeably.
- Drive
- External 12-point
- Bearing
- Integral flange
- Length basis
- Under flange
- Threads
- Metric · UNC · UNF · UNJ
- 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 Processing
Mixer drives and process-equipment bracketsIncoloy 825 12-point flange bolts fasten mixer drives and process-equipment brackets where a 12-point socket gives useful indexing around restricted equipment access. The flange supports the loaded head seat. Process liquid can remain at the contact after the exposed surface drains.
Pumps, Valves & OEM
Actuator mounts and pump baseplatesIncoloy 825 12-point flange bolts fasten actuator mounts and pump baseplates where a 12-point socket gives useful indexing around restricted equipment access. The flange supports the loaded head seat. Repeated maintenance makes fit, engagement and access part of the component specification.
Mining & Mineral Processing
Leach-equipment and dosing-skid supportsIncoloy 825 12-point flange bolts fasten leach-equipment and dosing-skid supports where a 12-point socket gives useful indexing around restricted equipment access. The flange supports the loaded head seat. Leach solution and deposits act on the installed part; corrosion duty is separate from abrasive wear.
Same 12-point flange bolt. Different material priorities.
Incoloy 825 material dataHastelloy C-276
Resistance to chemically aggressive, mixed process streams.
- Connection priority
- Clamp load through a compact head envelope
- Process liquid and shutdown chemistry
- C-276 is selected for its nickel–chromium–molybdenum–tungsten chemistry. Residual product, cleaning liquid and oxidising contamination can expose a sheltered connection differently from the main flow. Include liquid retained at the compact twelve-point drive and flange-bearing surface in the exposure description.
Inconel 625
Solid-solution strength and resistance to aggressive process liquids.
- Connection priority
- Clamp load through a compact head envelope
- 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 compact twelve-point drive and flange-bearing surface in the exposure description.
Hastelloy C-22
Corrosion resistance across oxidising and reducing process exposures.
- Connection priority
- Clamp load through a compact head envelope
- Production and cleaning cycles
- C-22’s chromium-bearing chemistry is relevant when chemical exposure changes between operating and cleaning cycles. Include both liquids when comparing it with C-276 or a B-type nickel alloy. Include liquid retained at the compact twelve-point drive and flange-bearing surface 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 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 12-point flange bolt enquiry
Questions about 825 12-point flange bolts
Does a twelve-point head establish a higher bolt strength?
The drive profile provides tool access. Strength comes from the specified alloy, final condition and section; head engagement and flange bearing still have to transmit the installation and service loads.