Inconel 625 Fasteners

Inconel 625 fasteners are high-performance fasteners made from the UNS N06625 nickel-chromium-molybdenum alloy. The addition of molybdenum and niobium to the alloy formulation gives these fasteners much better corrosion resistance than many other nickel alloys. Alloy 625 fasteners are used in some of the most demanding applications, including exposure to seawater, aggressive chemicals, and high-pressure systems. Good performance is shown over a wide temperature range from cryogenic to ~980°C.

The most referenced standard for Alloy 625 fasteners in structural and pressure applications is ASTM F468 UNS N06625.

Approx Price Range

Inconel 625 fasteners are priced higher than standard stainless grades due to their nickel content and alloying elements. Costs usually vary based on size, type, and order quantity.

Price Per Unit / Kg

Inconel 625 fasteners are priced between ₹3,800 and ₹9,600/kg depending on size, form, and order quantity. Smaller fasteners like M8 or M10 bolts are usually priced between ₹190 and ₹770/piece. Note: Custom lengths and larger studs are more expensive. Fasteners with UNS N06625 are more expensive than alloy 600 as they have molybdenum and niobium, which increase raw material costs.

Inconel 625 fasteners suppliers based in India generally offer more competitive pricing than European counterparts for equivalent grades and certifications.

Factors Affecting Price

The price of Alloy 625 fasteners is largely influenced by the price of nickel and molybdenum. Pricing is also influenced by design and complexity. Socket head caps, flange bolts, and custom parts typically have a higher price than regular hex bolts. Larger order volumes usually reduce the per‑kg rate. Additional expenses arise from NACE or third‑party testing, special surface finishes such as passivation or coatings, and expedited delivery requirements.

Types of Inconel 625 Fasteners

Inconel 625 fasteners are supplied in different types to suit various applications, including bolts, nuts, studs, screws, washers, and special fasteners.

Inconel 625 Bolts

Inconel 625 Nuts

Inconel 625 Studs

Inconel 625 Screws

Inconel 625 Washers

Inconel 625 Special Fasteners

Specifications of Inconel 625 Fasteners

The following table provides the specifications for Inconel 625 fasteners, including material grade, standards, thread details, size range, length limits, hardness values, and common forms supplied in industrial applications.

Parameter	Details
Material Grade	Inconel 625 / UNS N06625 / W.Nr. 2.4856
Standard	ASTM F468, ASTM B446, ASME SB446
Thread Standard	ASME B1.1, B1.13M
Size Range	M3 to M100 / 3/16" to 4"
Length	Up to 6000mm or custom
Hardness	241 HB max
Available Forms	Bolts, Nuts, Studs, Screws, Washers

Chemical Properties of Inconel 625 Fasteners

The chemical composition of Inconel 625 is provided in the table below. It is by the specified limits for the key elements used for material identification and quality control in industrial applications.

Element	Composition (%)
Grade	Inconel 625
Carbon (C)	0.10 max
Manganese (Mn)	0.50 max
Silicon (Si)	0.50 max
Sulfur (S)	0.015 max
Copper (Cu)	–
Iron (Fe)	5.0 max
Nickel (Ni)	58.0 min
Chromium (Cr)	20.0 – 23.0

Mechanical Properties of Inconel 625 Fasteners

This table presents the key physical and mechanical properties of Inconel 625, such as density, melting point, tensile strength, yield strength, and elongation values.

Property	Value
Grade	Inconel 625
Density	8.4 g/cm³
Melting Point	1350 °C (2460 °F)
Tensile Strength	1,35,000 psi / 930 MPa
Yield Strength (0.2% Offset)	75,000 psi / 517 MPa
Elongation	42.5 %

Physical Properties of Inconel 625 Fasteners

The table below presents the physical properties of Inconel 625 fasteners, including density, melting temperature range, thermal conductivity, electrical resistivity, and specific heat values used for performance reference.

Property	Value
Density	8.44 g/cm³
Melting Point	1290°C – 1350°C
Thermal Conductivity	9.8 W/m·K at 21°C
Electrical Resistivity	1.29 µΩ·m
Specific Heat	410 J/kg·K

Dimension Chart of Inconel 625 Fasteners

The chart presents standard dimensions of Inconel 625 fasteners, including shank diameter, head width, and head height for different bolt sizes.

Bolt Size	Shank Diameter (mm)	Head Width (mm)	Head Height (mm)
M6	6.0	10.0	4.0
M8	8.0	13.0	5.3
M10	10.0	16.0	6.4
M12	12.0	18.0	7.5
M16	16.0	24.0	10.0
M20	20.0	30.0	12.5
M24	24.0	36.0	15.0

Size Chart of Inconel 625 Fasteners

This table provides inch and metric size equivalents of Inconel 625 fasteners along with commonly available length ranges used in industrial applications.

Inch Size	Metric Equivalent	Common Length Range
1/4"	M6	10mm – 150mm
3/8"	M10	15mm – 200mm
1/2"	M12	20mm – 300mm
5/8"	M16	25mm – 400mm
3/4"	M20	30mm – 500mm
1"	M24	40mm – 600mm
1-1/4"	M30	50mm – 800mm

Torque Charts of Inconel 625 Fasteners

Below is a table of typical torques for Inconel 625 fasteners, dry and lubricated. Verify the exact torque required for your specific application.

Bolt Size	Torque (Nm) — Dry	Torque (Nm) — Lubricated
M6	9	7
M8	22	17
M10	44	33
M12	75	57
M16	185	140
M20	365	275
M24	625	470

Torque values are indicative. Always verify based on application conditions, gasket type, and flange specifications.

Key Features of Inconel 625 Fasteners

UNS N06625 fasteners are one of the few options that work reliably in both deep-sea and high-temperature industrial environments without significant degradation.

Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking
High tensile strength is maintained across a wide temperature range
Good fatigue strength and oxidation resistance up to 980°C
Resistant to chloride and seawater environments
Compatible with cryogenic service conditions
Non-magnetic in most conditions
Full material traceability available with EN 10204 3.1 / 3.2 certification

Applications of Inconel 625 Fasteners

Alloy 625 fasteners are used across multiple industries where both corrosion and mechanical performance matter:

Oil and Gas
Chemical Processing
Marine
Aerospace
Nuclear
Pollution Control
Power Generation

Inconel 625 fastener suppliers often serve multiple sectors simultaneously, since demand for this grade is consistent across industries.

How to Choose the Right Inconel 625 Fasteners Supplier?

Choosing the right Inconel 625 fasteners supplier affects material quality, traceability, and delivery reliability. For critical industries such as offshore, marine, and chemical processing, documentation and compliance checks are usually as important as pricing.

Supplier Selection Criteria

An ideal supplier of Inconel 625 fasteners should have a large stock of different forms and sizes of UNS N06625 fasteners and should be able to offer the documentation quickly. Experience in supplying to the oil and gas or marine industries is preferred as they are known to have very strict quality requirements. Suppliers who deal only in generic fasteners may not be suitable for critical applications.

Technical Considerations

Verify that the fasteners are ASTM F468 UNS N06625. NACE MR0175 compliance is usually required for offshore or subsea applications. The thread form, either ASME B1.1 or metric, must be the same as the mating component. Do not assume; always verify before ordering.

Quality & Certification Check

Request EN 10204 3.1 mill certificates as a minimum. For critical projects, you may need 3.2 certification with a third-party inspection. Sometimes dual certification is available, meaning the material meets two grades at the same time. It’s worth asking about. Some inconel 625 fastener price quotations do not include testing costs, so check what is included.

Procurement Tips for Bulk Orders

Get written quotes from multiple alloy 625 fastener suppliers before committing. Ask about packaging, export documentation, and whether the supplier can supply a single heat batch for traceability for bulk orders. Staggered delivery schedules can help contain inventory costs on large projects.