Description
Ni-Cr-Mo-Nb corrosion-resistant alloy
Inconel 625 Threaded Rod
High-strength nickel alloy all-thread for seawater, offshore, chemical processing and demanding chloride-bearing environments.
Product overview
Inconel 625 threaded rod is produced from UNS N06625 nickel-chromium-molybdenum-niobium alloy. The alloy combines solid-solution strength, fabricability and broad corrosion resistance, making it a frequent choice for marine, offshore and chemical process equipment.
ASTM B446 is commonly specified for Alloy 625 rod and bar starting material. The finished threaded product should additionally define the thread standard, dimensions, condition, mechanical testing, surface finish, anti-galling provisions and acceptance documentation.
Inconel 625 threaded rod specifications
| Material designation | Alloy 625 / UNS N06625 / EN 2.4856 |
|---|---|
| Starting material | ASTM B446 rod and bar, ordered condition; alternative project specification by agreement |
| Thread systems | ASME B1.1 UNC, UNF or 8UN; ASME B1.13M / ISO metric |
| Size range | 1/4–3 in and M6–M72 typical; larger custom sizes subject to availability |
| Length | Standard all-thread lengths or cut-to-length |
| Surface | Clean machined, pickled/passivated as specified; no carbon-steel contamination |
| Matching hardware | Alloy 625 or project-selected compatible nuts and washers |
| Inspection | EN 10204 3.1 MTC, PMI, dimensions, thread gauging and mechanical tests as ordered |
Final dimensions, tolerances, heat treatment, coating, testing and acceptance criteria follow the confirmed purchase order and the applicable standard edition. Availability depends on diameter, length, thread form and production quantity.
Why specify this material?
Alloy 625 is selected when both mechanical strength and resistance to seawater, chloride pitting, crevice corrosion and a range of process media are important. Actual chemical concentration, temperature, aeration, deposits and galvanic coupling remain essential selection inputs.
Engineering note
Nickel-alloy threads can gall under assembly load. Specify compatible nut material, surface finish, lubricant, engagement and installation procedure. Avoid uncontrolled chloride-bearing lubricants for sensitive service.
Typical applications
Quality, inspection and documentation
Alloy 625 threaded rod requires verified feedstock, clean alloy-controlled manufacturing and PMI. Surface condition and anti-galling requirements should be treated as functional specifications, not cosmetic options.
- EN 10204 3.1 material test certificate
- Heat-number and batch traceability
- Chemical composition and mechanical properties
- Dimensional inspection and thread gauging
- PMI for stainless and nickel alloys when ordered
- Coating thickness or surface inspection when applicable
- Third-party inspection and additional testing by agreement
- Export marking and seaworthy packing
Information required for quotation
- Material grade, governing material/bolting standard and required edition
- Diameter, thread series, pitch and thread class or tolerance
- Overall length, cut-end requirements and quantity
- Heat treatment, surface finish or coating system
- Matching nuts and washers, including anti-galling requirements
- Inspection plan, MTC, PMI, NDE and third-party witness requirements
- Delivery destination, packaging and required schedule
Frequently asked questions
Which material standard is used for Inconel 625 threaded rod?
ASTM B446 is commonly used for UNS N06625 rod and bar starting material. Finished-thread requirements, dimensions and testing must also be stated on the order.
Is Inconel 625 suitable for seawater?
It has excellent performance in many seawater applications, but the engineer must still consider temperature, crevices, deposits, velocity, cathodic protection and galvanic couples.
How can galling be reduced?
Use controlled thread finish, suitable mating material, approved lubricant, proper engagement and an installation procedure developed for nickel-alloy bolting.
Can Alloy 625 threaded rod be supplied with PMI?
Yes. PMI, heat traceability, dimensional inspection and EN 10204 3.1 documentation are commonly specified for critical alloy fasteners.
Related threaded rod products
Request a technical quotation
Send your bill of materials, drawing or project specification. SASA FLANGE will review the grade, thread, dimensions, documentation and delivery requirements before quotation.
