Inconel 625 Stud Bolts
Inconel 625 Stud Bolts are high-performance threaded fasteners made from UNS N06625, which is a nickel-chromium-molybdenum alloy with niobium. This combination of factors ensures that the alloy will exhibit excellent resistance to corrosion, oxidation, and pitting over a wide temperature range. These stud bolts hold their strength from cryogenic temperatures all the way up to 980°C. They are used in offshore oil and gas, chemical processing, marine, and aerospace applications where the conditions are too severe for standard steel or even stainless steel fasteners.
Price of Inconel 625 Stud Bolts
Alloy 625 Stud Bolts are a premium product, and the pricing reflects the high nickel content and precision manufacturing. Some figures for you to have as a reference for your budget planning.
Approx Price Range
The cost of UNS N06625 Stud Bolts in India ranges approximately between Rs. 1,250 to Rs. 1,750 per kg. Indicative pricing subject to change depending on thread configuration, finish, certification requirements, and order volumes. Contact us for a firm quote.
Price Per Unit / Kg
|
Size |
Approx Price Per Piece (INR) |
|
M10 x 50 mm |
Rs. 130 – Rs. 220 |
|
M12 x 75 mm |
Rs. 240 – Rs. 380 |
|
M16 x 100 mm |
Rs. 420 – Rs. 640 |
|
M20 x 150 mm |
Rs. 750 – Rs. 1,150 |
|
M24 x 200 mm |
Rs. 1,250 – Rs. 1,900 |
Factors Affecting Price
Nickel and molybdenum surcharges, thread form, heat treatment condition, order volume, third-party inspection requirements, and surface finish directly influence the final price of Inconel 625 Stud Bolts.
Types of UNS N06625 Stud Bolts
Alloy 625 Stud Bolts come in several configurations. The correct type is chosen based on the flange standard, pressure class, and how the joint is assembled.
- Fully Threaded Stud Bolts
- Double-End Stud Bolts
- Tap-End Stud Bolts
- Continuous Thread Stud Bolts
Specifications of Alloy 625 Stud Bolts
The table below covers the primary standards and dimensions to which Inconel 625 Stud Bolts are manufactured and tested.
|
Specification |
Details |
|
Material |
Inconel 625 / UNS N06625 / W.Nr. 2.4856 |
|
Standard |
ASTM B446 / ASME SB446 |
|
Thread Standard |
ASME B18.2.1 / DIN 976 / ISO 4033 |
|
Thread Form |
UNC, UNF, Metric Coarse, Metric Fine |
|
Condition |
Annealed / Hot Worked / Cold Worked |
|
Hardness |
25 HRC max (annealed) |
|
Length |
25 mm to 3000 mm |
|
Diameter |
M6 to M100 / 1/4" to 4" |
Chemical Properties of Inconel 625 Stud Bolts
The table below shows the chemical composition of UNS N06625. The high molybdenum and niobium content is what gives Alloy 625 its resistance to pitting, crevice corrosion, and intergranular attack.
|
Element |
Min (%) |
Max (%) |
|
Nickel (Ni) |
58.00 |
-- |
|
Chromium (Cr) |
20.00 |
23.00 |
|
Molybdenum (Mo) |
8.00 |
10.00 |
|
Niobium + Tantalum (Nb+Ta) |
3.15 |
4.15 |
|
Iron (Fe) |
-- |
5.00 |
|
Cobalt (Co) |
-- |
1.00 |
|
Carbon (C) |
-- |
0.10 |
|
Manganese (Mn) |
-- |
0.50 |
|
Silicon (Si) |
-- |
0.50 |
|
Phosphorus (P) |
-- |
0.015 |
|
Sulphur (S) |
-- |
0.015 |
|
Aluminium (Al) |
-- |
0.40 |
|
Titanium (Ti) |
-- |
0.40 |
Mechanical Properties of Inconel 625 Stud Bolts
These values apply to Alloy 625 Stud Bolts in the annealed condition. Cold-worked material will show higher tensile and yield strengths.
|
Property |
Value |
|
Tensile Strength |
827 MPa min |
|
0.2% Yield Strength |
414 MPa min |
|
Elongation |
30% min |
|
Reduction of Area |
50% min |
|
Hardness (HRB) |
100 max |
|
Modulus of Elasticity |
207 GPa |
Physical Properties of Inconel 625 Stud Bolts
The physical properties below are relevant to engineers selecting UNS N06625 Stud Bolts for high-temperature or thermally cycled service.
|
Property |
Value |
|
Density |
8.44 g/cm³ |
|
Melting Range |
1290 – 1350°C |
|
Specific Heat |
410 J/kg·°C |
|
Thermal Conductivity |
9.8 W/m·°C (at 21°C) |
|
Electrical Resistivity |
1.29 µΩ·m |
|
Magnetic Permeability |
1.006 (non-magnetic) |
|
Coefficient of Thermal Expansion |
12.8 µm/m·°C (21–538°C) |
Dimension Chart of Inconel 625 Stud Bolts
The dimension chart below is consistent with the dimensional data listed by leading suppliers. All measurements are for fully threaded and double-end stud bolts used with standard heavy hex nuts.
|
Nominal Diameter |
Thread Pitch (UNC) |
Body Diameter (mm) |
Across Flats – Nut (mm) |
Nut Height (mm) |
|
1/4" (M6) |
20 TPI |
6.35 |
11.11 |
5.56 |
|
5/16" (M8) |
18 TPI |
7.94 |
14.29 |
6.75 |
|
3/8" (M10) |
16 TPI |
9.53 |
17.46 |
8.73 |
|
1/2" (M12) |
13 TPI |
12.70 |
22.23 |
11.18 |
|
5/8" (M16) |
11 TPI |
15.88 |
28.58 |
13.89 |
|
3/4" (M20) |
10 TPI |
19.05 |
34.93 |
16.67 |
|
7/8" (M22) |
9 TPI |
22.23 |
39.69 |
19.45 |
|
1" (M24) |
8 TPI |
25.40 |
44.45 |
22.23 |
|
1-1/4" (M30) |
7 TPI |
31.75 |
53.98 |
25.40 |
|
1-1/2" (M36) |
6 TPI |
38.10 |
65.09 |
31.75 |
Size Chart of Inconel 625 Stud Bolts
The size chart below covers standard lengths for UNS N06625 Stud Bolts. Custom lengths are available on request.
|
Nominal Size (inches) |
Length Range (mm) |
Thread Length Each End (mm) |
Full Thread Option |
|
1/4" |
25 – 150 |
16 |
Yes |
|
3/8" |
30 – 200 |
19 |
Yes |
|
1/2" |
40 – 300 |
22 |
Yes |
|
5/8" |
50 – 400 |
25 |
Yes |
|
3/4" |
60 – 500 |
28 |
Yes |
|
7/8" |
75 – 600 |
32 |
Yes |
|
1" |
100 – 750 |
38 |
Yes |
|
1-1/4" |
125 – 900 |
45 |
Yes |
|
1-1/2" |
150 – 1200 |
51 |
Yes |
|
2" |
200 – 1500 |
63 |
Yes |
Torque Chart of Inconel 625 Stud Bolts
Correct torque values prevent both under-loading and galling on Alloy 625 threaded connections. The figures below are for dry conditions at ambient temperature. When using anti-seize lubricant, reduce torque by 15–20%.
|
Bolt Size |
Tensile Stress Area (mm²) |
Recommended Torque – Dry (Nm) |
Recommended Torque – Lubricated (Nm) |
|
M10 |
58.0 |
70 |
60 |
|
M12 |
84.3 |
120 |
100 |
|
M16 |
157.0 |
290 |
245 |
|
M20 |
245.0 |
580 |
490 |
|
M24 |
353.0 |
1,000 |
850 |
|
M30 |
561.0 |
2,000 |
1,700 |
|
M36 |
817.0 |
3,400 |
2,900 |
|
1/2" UNC |
126.7 |
150 |
125 |
|
5/8" UNC |
198.1 |
310 |
260 |
|
3/4" UNC |
284.9 |
540 |
460 |
|
1" UNC |
506.7 |
1,200 |
1,020 |
Key Features of Inconel 625 Stud Bolts
The key features of Inconel 625 Stud Bolts are listed below.
- Outstanding corrosion resistance
- Wide temperature range
- High fatigue strength.
- No sensitisation
- Non-magnetic
- NACE compliant
- Seawater resistant
- Versatile thread forms
Applications of Inconel 625 Stud Bolts
UNS N06625 Stud Bolts are a go-to choice when the operating environment rules out lower-grade materials.
- Oil and gas: Subsea wellheads, Christmas trees, risers, and sour gas piping systems.
- Chemical processing: Reactors, heat exchangers, and pressure vessels handling acids, chlorides, and organic compounds.
- Marine and offshore: Platform structural connections, seawater piping, and desalination plant equipment.
- Aerospace: Exhaust components, thrust reversers, and engine nacelles.
- Nuclear: Reactor core components and primary circuit piping joints.
- Pulp and paper: Digester vessels and bleaching plant piping under corrosive conditions.
- Cryogenic systems: LNG storage tanks, cold boxes, and low-temperature pressure vessels.
How to Choose the Right Inconel 625 Stud Bolts Supplier?
Alloy 625 is a speciality material, and the quality difference between suppliers is real. Poor-quality fasteners in critical service can cause joint leaks or fastener failure, both of which carry serious consequences. Below are the key checks to make before you commit to a supplier.
Supplier Selection Criteria
Choose a supplier who sources Inconel 625 bar stock from certified mills and can provide full material traceability back to the heat number. Suppliers who cannot produce a mill test report (MTR) tied to your specific order should not be considered for safety-critical applications.
Technical Considerations
Verify that the stud bolts are manufactured to ASTM B446 / ASME SB446 and that threading conforms to ASME B18.2.1 or DIN 976. Check that the material condition (cold-worked or annealed) is in accordance with your design specification. Ask for dimensional inspection reports and hardness test certificates before shipment of goods.
Quality & Certification Check
Request for EN 10204 3.1 or 3.2 material certificates. Offshore and sour service NACE MR0175 / ISO 15156 compliance verification. And finally, third-party inspection by TUV, Bureau Veritas, SGS, Lloyd's Register, etc. adds a layer of warranty that is credible. Ensure the manufacturing plant is ISO 9001 and, where applicable, PED certified.
Procurement Tips for Bulk Orders
Request a first article inspection (FAI) on a sample lot before full production for volume orders. Specify packaging requirements, e.g., thread protector caps, moisture-proof wrapping, and heat number marking of individual pieces. Get all lead times and certification requirements confirmed in writing before placing the order.
Inconel 625 Stud Bolts are high-performance threaded fasteners made from UNS N06625, which is a nickel-chromium-molybdenum alloy with niobium. This combination of factors ensures that the alloy will exhibit excellent resistance to corrosion, oxidation, and pitting over a wide temperature range. These stud bolts hold their strength from cryogenic temperatures all the way up to 980°C. They are used in offshore oil and gas, chemical processing, marine, and aerospace applications where the conditions are too severe for standard steel or even stainless steel fasteners.
Price of Inconel 625 Stud Bolts
Alloy 625 Stud Bolts are a premium product, and the pricing reflects the high nickel content and precision manufacturing. Some figures for you to have as a reference for your budget planning.
Approx Price Range
The cost of UNS N06625 Stud Bolts in India ranges approximately between Rs. 1,250 to Rs. 1,750 per kg. Indicative pricing subject to change depending on thread configuration, finish, certification requirements, and order volumes. Contact us for a firm quote.
Price Per Unit / Kg
|
Size |
Approx Price Per Piece (INR) |
|
M10 x 50 mm |
Rs. 130 – Rs. 220 |
|
M12 x 75 mm |
Rs. 240 – Rs. 380 |
|
M16 x 100 mm |
Rs. 420 – Rs. 640 |
|
M20 x 150 mm |
Rs. 750 – Rs. 1,150 |
|
M24 x 200 mm |
Rs. 1,250 – Rs. 1,900 |
Factors Affecting Price
Nickel and molybdenum surcharges, thread form, heat treatment condition, order volume, third-party inspection requirements, and surface finish directly influence the final price of Inconel 625 Stud Bolts.
Types of UNS N06625 Stud Bolts
Alloy 625 Stud Bolts come in several configurations. The correct type is chosen based on the flange standard, pressure class, and how the joint is assembled.
- Fully Threaded Stud Bolts
- Double-End Stud Bolts
- Tap-End Stud Bolts
- Continuous Thread Stud Bolts
Specifications of Alloy 625 Stud Bolts
The table below covers the primary standards and dimensions to which Inconel 625 Stud Bolts are manufactured and tested.
|
Specification |
Details |
|
Material |
Inconel 625 / UNS N06625 / W.Nr. 2.4856 |
|
Standard |
ASTM B446 / ASME SB446 |
|
Thread Standard |
ASME B18.2.1 / DIN 976 / ISO 4033 |
|
Thread Form |
UNC, UNF, Metric Coarse, Metric Fine |
|
Condition |
Annealed / Hot Worked / Cold Worked |
|
Hardness |
25 HRC max (annealed) |
|
Length |
25 mm to 3000 mm |
|
Diameter |
M6 to M100 / 1/4" to 4" |
Chemical Properties of Inconel 625 Stud Bolts
The table below shows the chemical composition of UNS N06625. The high molybdenum and niobium content is what gives Alloy 625 its resistance to pitting, crevice corrosion, and intergranular attack.
|
Element |
Min (%) |
Max (%) |
|
Nickel (Ni) |
58.00 |
-- |
|
Chromium (Cr) |
20.00 |
23.00 |
|
Molybdenum (Mo) |
8.00 |
10.00 |
|
Niobium + Tantalum (Nb+Ta) |
3.15 |
4.15 |
|
Iron (Fe) |
-- |
5.00 |
|
Cobalt (Co) |
-- |
1.00 |
|
Carbon (C) |
-- |
0.10 |
|
Manganese (Mn) |
-- |
0.50 |
|
Silicon (Si) |
-- |
0.50 |
|
Phosphorus (P) |
-- |
0.015 |
|
Sulphur (S) |
-- |
0.015 |
|
Aluminium (Al) |
-- |
0.40 |
|
Titanium (Ti) |
-- |
0.40 |
Mechanical Properties of Inconel 625 Stud Bolts
These values apply to Alloy 625 Stud Bolts in the annealed condition. Cold-worked material will show higher tensile and yield strengths.
|
Property |
Value |
|
Tensile Strength |
827 MPa min |
|
0.2% Yield Strength |
414 MPa min |
|
Elongation |
30% min |
|
Reduction of Area |
50% min |
|
Hardness (HRB) |
100 max |
|
Modulus of Elasticity |
207 GPa |
Physical Properties of Inconel 625 Stud Bolts
The physical properties below are relevant to engineers selecting UNS N06625 Stud Bolts for high-temperature or thermally cycled service.
|
Property |
Value |
|
Density |
8.44 g/cm³ |
|
Melting Range |
1290 – 1350°C |
|
Specific Heat |
410 J/kg·°C |
|
Thermal Conductivity |
9.8 W/m·°C (at 21°C) |
|
Electrical Resistivity |
1.29 µΩ·m |
|
Magnetic Permeability |
1.006 (non-magnetic) |
|
Coefficient of Thermal Expansion |
12.8 µm/m·°C (21–538°C) |
Dimension Chart of Inconel 625 Stud Bolts
The dimension chart below is consistent with the dimensional data listed by leading suppliers. All measurements are for fully threaded and double-end stud bolts used with standard heavy hex nuts.
|
Nominal Diameter |
Thread Pitch (UNC) |
Body Diameter (mm) |
Across Flats – Nut (mm) |
Nut Height (mm) |
|
1/4" (M6) |
20 TPI |
6.35 |
11.11 |
5.56 |
|
5/16" (M8) |
18 TPI |
7.94 |
14.29 |
6.75 |
|
3/8" (M10) |
16 TPI |
9.53 |
17.46 |
8.73 |
|
1/2" (M12) |
13 TPI |
12.70 |
22.23 |
11.18 |
|
5/8" (M16) |
11 TPI |
15.88 |
28.58 |
13.89 |
|
3/4" (M20) |
10 TPI |
19.05 |
34.93 |
16.67 |
|
7/8" (M22) |
9 TPI |
22.23 |
39.69 |
19.45 |
|
1" (M24) |
8 TPI |
25.40 |
44.45 |
22.23 |
|
1-1/4" (M30) |
7 TPI |
31.75 |
53.98 |
25.40 |
|
1-1/2" (M36) |
6 TPI |
38.10 |
65.09 |
31.75 |
Size Chart of Inconel 625 Stud Bolts
The size chart below covers standard lengths for UNS N06625 Stud Bolts. Custom lengths are available on request.
|
Nominal Size (inches) |
Length Range (mm) |
Thread Length Each End (mm) |
Full Thread Option |
|
1/4" |
25 – 150 |
16 |
Yes |
|
3/8" |
30 – 200 |
19 |
Yes |
|
1/2" |
40 – 300 |
22 |
Yes |
|
5/8" |
50 – 400 |
25 |
Yes |
|
3/4" |
60 – 500 |
28 |
Yes |
|
7/8" |
75 – 600 |
32 |
Yes |
|
1" |
100 – 750 |
38 |
Yes |
|
1-1/4" |
125 – 900 |
45 |
Yes |
|
1-1/2" |
150 – 1200 |
51 |
Yes |
|
2" |
200 – 1500 |
63 |
Yes |
Torque Chart of Inconel 625 Stud Bolts
Correct torque values prevent both under-loading and galling on Alloy 625 threaded connections. The figures below are for dry conditions at ambient temperature. When using anti-seize lubricant, reduce torque by 15–20%.
|
Bolt Size |
Tensile Stress Area (mm²) |
Recommended Torque – Dry (Nm) |
Recommended Torque – Lubricated (Nm) |
|
M10 |
58.0 |
70 |
60 |
|
M12 |
84.3 |
120 |
100 |
|
M16 |
157.0 |
290 |
245 |
|
M20 |
245.0 |
580 |
490 |
|
M24 |
353.0 |
1,000 |
850 |
|
M30 |
561.0 |
2,000 |
1,700 |
|
M36 |
817.0 |
3,400 |
2,900 |
|
1/2" UNC |
126.7 |
150 |
125 |
|
5/8" UNC |
198.1 |
310 |
260 |
|
3/4" UNC |
284.9 |
540 |
460 |
|
1" UNC |
506.7 |
1,200 |
1,020 |
Key Features of Inconel 625 Stud Bolts
The key features of Inconel 625 Stud Bolts are listed below.
- Outstanding corrosion resistance
- Wide temperature range
- High fatigue strength.
- No sensitisation
- Non-magnetic
- NACE compliant
- Seawater resistant
- Versatile thread forms
Applications of Inconel 625 Stud Bolts
UNS N06625 Stud Bolts are a go-to choice when the operating environment rules out lower-grade materials.
- Oil and gas: Subsea wellheads, Christmas trees, risers, and sour gas piping systems.
- Chemical processing: Reactors, heat exchangers, and pressure vessels handling acids, chlorides, and organic compounds.
- Marine and offshore: Platform structural connections, seawater piping, and desalination plant equipment.
- Aerospace: Exhaust components, thrust reversers, and engine nacelles.
- Nuclear: Reactor core components and primary circuit piping joints.
- Pulp and paper: Digester vessels and bleaching plant piping under corrosive conditions.
- Cryogenic systems: LNG storage tanks, cold boxes, and low-temperature pressure vessels.
How to Choose the Right Inconel 625 Stud Bolts Supplier?
Alloy 625 is a speciality material, and the quality difference between suppliers is real. Poor-quality fasteners in critical service can cause joint leaks or fastener failure, both of which carry serious consequences. Below are the key checks to make before you commit to a supplier.
Supplier Selection Criteria
Choose a supplier who sources Inconel 625 bar stock from certified mills and can provide full material traceability back to the heat number. Suppliers who cannot produce a mill test report (MTR) tied to your specific order should not be considered for safety-critical applications.
Technical Considerations
Verify that the stud bolts are manufactured to ASTM B446 / ASME SB446 and that threading conforms to ASME B18.2.1 or DIN 976. Check that the material condition (cold-worked or annealed) is in accordance with your design specification. Ask for dimensional inspection reports and hardness test certificates before shipment of goods.
Quality & Certification Check
Request for EN 10204 3.1 or 3.2 material certificates. Offshore and sour service NACE MR0175 / ISO 15156 compliance verification. And finally, third-party inspection by TUV, Bureau Veritas, SGS, Lloyd's Register, etc. adds a layer of warranty that is credible. Ensure the manufacturing plant is ISO 9001 and, where applicable, PED certified.
Procurement Tips for Bulk Orders
Request a first article inspection (FAI) on a sample lot before full production for volume orders. Specify packaging requirements, e.g., thread protector caps, moisture-proof wrapping, and heat number marking of individual pieces. Get all lead times and certification requirements confirmed in writing before placing the order.
Inconel 625 Stud Bolts Suppliers
Inconel 625 Stud Bolts FAQ's
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