INCONEL 625 FASTENERS | ULTIMATE GUIDE

Ananka Fasteners is a global manufacturer and supplier of top-tier Inconel 625 Fasteners (UNS N06625 / W.Nr. 2.4856). Known for its high strength, excellent fabricability, and outstanding corrosion resistance, Alloy 625 derives its strength from the stiffening effect of molybdenum and niobium on its nickel-chromium matrix—eliminating the need for precipitation-hardening treatments.

■ Complete Range of Inconel 625 Fasteners

We manufacture an extensive range of Alloy 625 fastening solutions for critical applications. Click on specific categories below for detailed dimension tables and individual specifications (Links updating soon).

Bolts & Screws	Nuts & Washers	Studs & Rods
Hex Bolts / Heavy Hex Bolts	Hex Nuts / Heavy Hex Nuts	Fully Threaded Studs
Socket Head Cap Screws	Flange Nuts / Lock Nuts	Double Ended Studs
Flange Bolts / Carriage Bolts	Flat Washers / Spring Washers	Threaded Rods / Tie Rods
Countersunk Screws / Set Screws	Dome Nuts / Square Nuts	Custom CNC Machined Studs

■ Inconel Alloy 625 Material Specifications

Material Equivalent Grades	UNS N06625 \| W.Nr. 2.4856 \| Alloy 625 \| NiCr22Mo9Nb \| AFNOR NC22DNb
Standard Specifications	ASTM B446 / ASME SB446 (Rod, Bar) ASTM F467 / ASTM F468 (Nonferrous Nuts & Bolts)
Size Range	Metric: M3 to M60 \| Imperial: 1/4" to 4" (Custom sizes manufactured to print)
Thread Types	Metric Coarse, Metric Fine, UNC, UNF, BSW, BSF
Dimensions Standards	DIN, ISO, UNI, CSN, EN, BS, ANSI/ASME (e.g., ASME B18.2.1, B18.2.2)

■ Chemical Composition of Alloy 625

The addition of Molybdenum (Mo) and Niobium (Nb) provides solid-solution strengthening, allowing Inconel 625 to deliver superior strength without heat treatment, while granting exceptional resistance to localized corrosion (pitting and crevice).

Ni (Nickel)	Cr (Chromium)	Mo (Molybdenum)	Nb + Ta (Niobium)	Fe (Iron)	C (Carbon)	Mn (Manganese)	Si (Silicon)
58.0% Min	20.0 - 23.0%	8.0 - 10.0%	3.15 - 4.15%	5.0% Max	0.10% Max	0.50% Max	0.50% Max

■ Mechanical & Physical Properties

Tensile Strength (Min)	Yield Strength 0.2% Offset (Min)	Elongation (%)	Density	Melting Range
827 MPa (120 ksi)	414 MPa (60 ksi)	30% Min	8.44 g/cm³	1290 - 1350°C (2350 - 2460°F)

■ Standard Product Pages

Explore our dedicated standard pages for specific fastener categories to view detailed dimensions, availability, and specific technical data:

Inconel 625 Bolts: Comprehensive range of heavy hex, flange, and socket head configurations.
Inconel 625 Nuts: View our dedicated page for standard hex, heavy hex, and prevailing torque locknuts.
Inconel 625 Studs: Fully threaded, double-ended, and custom machined tie rods for high-pressure joints.
Inconel 625 Washer: Fully threaded, double-ended, and custom machined tie rods for high-pressure joints.

■ Torque & Installation Guidelines (UNC Threads)

To proactively counteract galling and achieve an accurate, highly predictable tension-to-torque relationship, the application of engineered high-temperature nickel-compatible anti-seize lubricants is functionally mandatory during assembly.

Nominal Diameter	Threads Per Inch (UNC)	Target Torque – Dry (ft-lbs)	Target Torque – Lubricated (ft-lbs)
1/2"	13	53.0	40.0
5/8"	11	106.0	79.0
3/4"	10	187.0	140.0
1"	8	454.0	340.0

■ Key Characteristics & Applications

Inconel 625 is renowned for its versatility. It operates effectively from cryogenic temperatures up to 1800°F (982°C). Its alloy composition makes it virtually immune to chloride ion stress-corrosion cracking and offers excellent fatigue strength.

Marine & Offshore: Propeller blades, submarine propulsion motors, underwater wire rope, and marine fastening assemblies due to unparalleled resistance to localized chloride attack.
Aerospace: Aircraft ducting systems, engine exhaust systems, and thrust-reverser systems.
Chemical Processing: Heat exchangers, vessels, and valves handling severely corrosive acids and sour gas (H2S) environments.
Pollution Control: Scrubber systems, chimney liners, and flue gas desulfurization (FGD) components.

Engineering Note & Quality Assurance: Inconel 625 is highly specified in sour gas (NACE MR0175) and offshore applications. All Ananka Fasteners are supplied with EN 10204 Type 3.1 Mill Test Certificates (MTC), with 100% PMI (Positive Material Identification) and dimensional checks performed prior to dispatch.

■ Sample Mill Test Certificate (MTC 3.1)

Download Inconel 625 Sample MTC

Verify our commitment to quality. View a genuine, redacted EN 10204-2004 3.1 Mill Test Certificate for our Inconel 625 (UNS N06625) fasteners.

Traceable Heat & Lot Numbers
Full Chemical Composition (Lab Verified)
Heat Treatment Records (Solution Annealing)
Mechanical Testing (Tensile, Yield, Hardness)