Inconel 718 Stud Bolts
Inconel 718 Stud Bolts are high-strength threaded fasteners made from UNS N07718, a nickel-chromium-molybdenum superalloy. The alloy contains roughly 50–55% nickel, 17–21% chromium, and additions of niobium and molybdenum that give it exceptional strength at elevated temperatures. They are frequently found in the oil and gas, aerospace, power generation, and chemical processing industries, where standard carbon or stainless steel fasteners don't hold up.
Price of Inconel 718 Stud Bolts
Alloy 718 Stud Bolts price is based on the thread size, length, finish, and quantity ordered. Reference prices are shown below to help you plan procurement.
Approx Price Range
The price of UNS N07718 Stud Bolts in India is Rs 1,750 to Rs 2,000 per kg. All prices are subject to change and are shown for guidance only, depending on the cost of raw materials, the size of your order, and current market prices.
Price Per Unit / Kg
|
Size |
Approx Price Per Piece (INR) |
|
M10 x 50 mm |
Rs. 180 – Rs. 280 |
|
M12 x 75 mm |
Rs. 300 – Rs. 450 |
|
M16 x 100 mm |
Rs. 500 – Rs. 750 |
|
M20 x 150 mm |
Rs. 900 – Rs. 1,400 |
|
M24 x 200 mm |
Rs. 1,500 – Rs. 2,200 |
Factors Affecting Price
Inconel 718 Stud Bolts final price is based on the raw material surcharges of Nickel and Niobium, order quantity, thread specification, heat treatment, and third-party certifications.
Types of UNS N07718 Stud Bolts
Inconel 718 Stud Bolts come in various configurations to accommodate different flange and joint requirements. The right type depends on the application standard, pressure class, and joint design.
- Fully Threaded Stud Bolts
- Double-End Stud Bolts
- Tap-End Stud Bolts
- Continuous Thread Stud Bolts
Specifications of Inconel 718 Stud Bolts
The table below covers the key standards and specifications that Alloy 718 Stud Bolts are manufactured and tested to.
|
Specification |
Details |
|
Material |
Inconel 718 / UNS N07718 / W.Nr. 2.4668 |
|
Standard |
ASTM B637 / ASME SB637 |
|
Thread Standard |
ASME B18.2.1 / DIN 976 / ISO 4033 |
|
Thread Form |
UNC, UNF, Metric Coarse, Metric Fine |
|
Hardness |
36 HRC max |
|
Condition |
Age Hardened / Solution Annealed |
|
Length |
25 mm to 3000 mm |
|
Diameter |
M6 to M100 / 1/4" to 4" |
|
Finish |
Plain, Zinc Plated, Hot Dip Galvanised, Xylan Coated |
Chemical Properties of Inconel 718 Stud Bolts
The table below lists the chemical composition of UNS N07718. The niobium content is what sets Alloy 718 apart from other Inconel grades in terms of age-hardening response.
|
Element |
Min (%) |
Max (%) |
|
Nickel (Ni) |
50.00 |
55.00 |
|
Chromium (Cr) |
17.00 |
21.00 |
|
Molybdenum (Mo) |
2.80 |
3.30 |
|
Niobium + Tantalum (Nb+Ta) |
4.75 |
5.50 |
|
Iron (Fe) |
Balance |
-- |
|
Titanium (Ti) |
0.65 |
1.15 |
|
Aluminium (Al) |
0.20 |
0.80 |
|
Carbon (C) |
-- |
0.08 |
|
Manganese (Mn) |
-- |
0.35 |
|
Silicon (Si) |
-- |
0.35 |
|
Phosphorus (P) |
-- |
0.015 |
|
Sulphur (S) |
-- |
0.015 |
|
Boron (B) |
-- |
0.006 |
|
Cobalt (Co) |
-- |
1.00 |
|
Copper (Cu) |
-- |
0.30 |
Mechanical Properties of Inconel 718 Stud Bolts
Alloy 718 Stud Bolts in the age-hardened condition offer some of the highest tensile and yield strengths among commercially available nickel alloy fasteners.
|
Property |
Value |
|
Tensile Strength |
1275 MPa min |
|
0.2% Yield Strength |
1034 MPa min |
|
Elongation |
12% min |
|
Reduction of Area |
15% min |
|
Hardness (HRC) |
36 max |
|
Charpy Impact (at -196°C) |
34 J min |
Physical Properties of Inconel 718 Stud Bolts
These physical constants are important for thermal system design, load calculations, and corrosion assessment across operating conditions.
|
Property |
Value |
|
Density |
8.19 g/cm³ |
|
Melting Range |
1260 – 1336°C |
|
Specific Heat |
435 J/kg·°C |
|
Thermal Conductivity |
11.4 W/m·°C (at 21°C) |
|
Electrical Resistivity |
1.25 µΩ·m |
|
Magnetic Permeability |
1.0011 (essentially non-magnetic) |
|
Coefficient of Thermal Expansion |
13.0 µm/m·°C (21–538°C) |
Dimension Chart of Inconel 718 Stud Bolts
The dimension chart below is consistent with data published by leading suppliers. Dimensions 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 718 Stud Bolts
The size chart below covers standard lengths for UNS N07718 Stud Bolts. Custom lengths are available on request.
|
Nominal Size (inches) |
Length Range (mm) |
Thread Length Each End (mm) |
Full Thread Length (mm) |
|
1/4" |
25 – 150 |
16 |
Full |
|
3/8" |
30 – 200 |
19 |
Full |
|
1/2" |
40 – 300 |
22 |
Full |
|
5/8" |
50 – 400 |
25 |
Full |
|
3/4" |
60 – 500 |
28 |
Full |
|
7/8" |
75 – 600 |
32 |
Full |
|
1" |
100 – 750 |
38 |
Full |
|
1-1/4" |
125 – 900 |
45 |
Full |
|
1-1/2" |
150 – 1200 |
51 |
Full |
|
2" |
200 – 1500 |
63 |
Full |
Torque Chart of Inconel 718 Stud Bolts
Proper torque values are critical for Alloy 718 Stud Bolts in high-pressure service. The values below apply to dry (unlubricated) conditions at room temperature. When using anti-seize compounds, reduce torque by 15–20%.
|
Bolt Size |
Tensile Stress Area (mm²) |
Recommended Torque – Dry (Nm) |
Recommended Torque – Lubricated (Nm) |
|
M10 |
58.0 |
95 |
80 |
|
M12 |
84.3 |
165 |
140 |
|
M16 |
157.0 |
390 |
330 |
|
M20 |
245.0 |
780 |
660 |
|
M24 |
353.0 |
1,350 |
1,150 |
|
M30 |
561.0 |
2,700 |
2,300 |
|
M36 |
817.0 |
4,600 |
3,900 |
|
1/2" UNC |
126.7 |
200 |
170 |
|
5/8" UNC |
198.1 |
410 |
350 |
|
3/4" UNC |
284.9 |
730 |
620 |
|
1" UNC |
506.7 |
1,600 |
1,360 |
Key Features of Inconel 718 Stud Bolts
Below are important features of Inconel 718 Stud Bolts.
- High-temperature strength
- Age-hardenable
- Oxidation resistance
- Corrosion resistance
- Non-magnetic
- NACE compliance
- Weldability
- Cryogenic performance
Applications of Inconel 718 Stud Bolts
Inconel 718 Stud Bolts are specified wherever high-strength fastening is needed under heat, pressure, or corrosive conditions.
- Oil and gas
- Aerospace
- Power generation
- Chemical processing
- Petrochemical
- Marine
- Cryogenic systems
How to Choose the Right Inconel 718 Stud Bolts Supplier?
Not all suppliers deliver the same quality of material and documentation. Choosing the wrong one creates on-site risks, delays project timelines, and can lead to costly failures. Here is what to check before you place an order.
Supplier Selection Criteria
Look for a supplier with direct mill connections for Inconel 718 material. They should be able to provide mill test reports (MTRs) and material traceability documents. Suppliers without proper documentation should not be considered for critical service applications.
Technical Considerations
Confirm that the supplier manufactures to ASTM B637 and threads to ASME B18.2.1 or DIN 976. Check whether the fasteners are solution annealed and age hardened as per AMS 5663 or AMS 5664. Ask specifically for hardness test results and dimensional inspection reports before dispatch.
Quality & Certification Check
Ask for third-party inspection certificates from TUV, Bureau Veritas, SGS, or Lloyd’s. Material certification EN 10204 3.1 or 3.2 check. NACE MR0175 compliance for sour service is confirmed. ISO 9001 and PED certification are a minimum requirement at the manufacturing facility.
Procurement Tips for Bulk Orders
For large quantities, request a first article inspection (FAI) on a sample lot before full production. Agree on lead times, packaging standards (thread protection caps, moisture-proof bags), and labelling requirements. To avoid customs delays on imports, always get a commercial invoice that matches the MTR heat number.
Inconel 718 Stud Bolts are high-strength threaded fasteners made from UNS N07718, a nickel-chromium-molybdenum superalloy. The alloy contains roughly 50–55% nickel, 17–21% chromium, and additions of niobium and molybdenum that give it exceptional strength at elevated temperatures. They are frequently found in the oil and gas, aerospace, power generation, and chemical processing industries, where standard carbon or stainless steel fasteners don't hold up.
Price of Inconel 718 Stud Bolts
Alloy 718 Stud Bolts price is based on the thread size, length, finish, and quantity ordered. Reference prices are shown below to help you plan procurement.
Approx Price Range
The price of UNS N07718 Stud Bolts in India is Rs 1,750 to Rs 2,000 per kg. All prices are subject to change and are shown for guidance only, depending on the cost of raw materials, the size of your order, and current market prices.
Price Per Unit / Kg
|
Size |
Approx Price Per Piece (INR) |
|
M10 x 50 mm |
Rs. 180 – Rs. 280 |
|
M12 x 75 mm |
Rs. 300 – Rs. 450 |
|
M16 x 100 mm |
Rs. 500 – Rs. 750 |
|
M20 x 150 mm |
Rs. 900 – Rs. 1,400 |
|
M24 x 200 mm |
Rs. 1,500 – Rs. 2,200 |
Factors Affecting Price
Inconel 718 Stud Bolts final price is based on the raw material surcharges of Nickel and Niobium, order quantity, thread specification, heat treatment, and third-party certifications.
Types of UNS N07718 Stud Bolts
Inconel 718 Stud Bolts come in various configurations to accommodate different flange and joint requirements. The right type depends on the application standard, pressure class, and joint design.
- Fully Threaded Stud Bolts
- Double-End Stud Bolts
- Tap-End Stud Bolts
- Continuous Thread Stud Bolts
Specifications of Inconel 718 Stud Bolts
The table below covers the key standards and specifications that Alloy 718 Stud Bolts are manufactured and tested to.
|
Specification |
Details |
|
Material |
Inconel 718 / UNS N07718 / W.Nr. 2.4668 |
|
Standard |
ASTM B637 / ASME SB637 |
|
Thread Standard |
ASME B18.2.1 / DIN 976 / ISO 4033 |
|
Thread Form |
UNC, UNF, Metric Coarse, Metric Fine |
|
Hardness |
36 HRC max |
|
Condition |
Age Hardened / Solution Annealed |
|
Length |
25 mm to 3000 mm |
|
Diameter |
M6 to M100 / 1/4" to 4" |
|
Finish |
Plain, Zinc Plated, Hot Dip Galvanised, Xylan Coated |
Chemical Properties of Inconel 718 Stud Bolts
The table below lists the chemical composition of UNS N07718. The niobium content is what sets Alloy 718 apart from other Inconel grades in terms of age-hardening response.
|
Element |
Min (%) |
Max (%) |
|
Nickel (Ni) |
50.00 |
55.00 |
|
Chromium (Cr) |
17.00 |
21.00 |
|
Molybdenum (Mo) |
2.80 |
3.30 |
|
Niobium + Tantalum (Nb+Ta) |
4.75 |
5.50 |
|
Iron (Fe) |
Balance |
-- |
|
Titanium (Ti) |
0.65 |
1.15 |
|
Aluminium (Al) |
0.20 |
0.80 |
|
Carbon (C) |
-- |
0.08 |
|
Manganese (Mn) |
-- |
0.35 |
|
Silicon (Si) |
-- |
0.35 |
|
Phosphorus (P) |
-- |
0.015 |
|
Sulphur (S) |
-- |
0.015 |
|
Boron (B) |
-- |
0.006 |
|
Cobalt (Co) |
-- |
1.00 |
|
Copper (Cu) |
-- |
0.30 |
Mechanical Properties of Inconel 718 Stud Bolts
Alloy 718 Stud Bolts in the age-hardened condition offer some of the highest tensile and yield strengths among commercially available nickel alloy fasteners.
|
Property |
Value |
|
Tensile Strength |
1275 MPa min |
|
0.2% Yield Strength |
1034 MPa min |
|
Elongation |
12% min |
|
Reduction of Area |
15% min |
|
Hardness (HRC) |
36 max |
|
Charpy Impact (at -196°C) |
34 J min |
Physical Properties of Inconel 718 Stud Bolts
These physical constants are important for thermal system design, load calculations, and corrosion assessment across operating conditions.
|
Property |
Value |
|
Density |
8.19 g/cm³ |
|
Melting Range |
1260 – 1336°C |
|
Specific Heat |
435 J/kg·°C |
|
Thermal Conductivity |
11.4 W/m·°C (at 21°C) |
|
Electrical Resistivity |
1.25 µΩ·m |
|
Magnetic Permeability |
1.0011 (essentially non-magnetic) |
|
Coefficient of Thermal Expansion |
13.0 µm/m·°C (21–538°C) |
Dimension Chart of Inconel 718 Stud Bolts
The dimension chart below is consistent with data published by leading suppliers. Dimensions 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 718 Stud Bolts
The size chart below covers standard lengths for UNS N07718 Stud Bolts. Custom lengths are available on request.
|
Nominal Size (inches) |
Length Range (mm) |
Thread Length Each End (mm) |
Full Thread Length (mm) |
|
1/4" |
25 – 150 |
16 |
Full |
|
3/8" |
30 – 200 |
19 |
Full |
|
1/2" |
40 – 300 |
22 |
Full |
|
5/8" |
50 – 400 |
25 |
Full |
|
3/4" |
60 – 500 |
28 |
Full |
|
7/8" |
75 – 600 |
32 |
Full |
|
1" |
100 – 750 |
38 |
Full |
|
1-1/4" |
125 – 900 |
45 |
Full |
|
1-1/2" |
150 – 1200 |
51 |
Full |
|
2" |
200 – 1500 |
63 |
Full |
Torque Chart of Inconel 718 Stud Bolts
Proper torque values are critical for Alloy 718 Stud Bolts in high-pressure service. The values below apply to dry (unlubricated) conditions at room temperature. When using anti-seize compounds, reduce torque by 15–20%.
|
Bolt Size |
Tensile Stress Area (mm²) |
Recommended Torque – Dry (Nm) |
Recommended Torque – Lubricated (Nm) |
|
M10 |
58.0 |
95 |
80 |
|
M12 |
84.3 |
165 |
140 |
|
M16 |
157.0 |
390 |
330 |
|
M20 |
245.0 |
780 |
660 |
|
M24 |
353.0 |
1,350 |
1,150 |
|
M30 |
561.0 |
2,700 |
2,300 |
|
M36 |
817.0 |
4,600 |
3,900 |
|
1/2" UNC |
126.7 |
200 |
170 |
|
5/8" UNC |
198.1 |
410 |
350 |
|
3/4" UNC |
284.9 |
730 |
620 |
|
1" UNC |
506.7 |
1,600 |
1,360 |
Key Features of Inconel 718 Stud Bolts
Below are important features of Inconel 718 Stud Bolts.
- High-temperature strength
- Age-hardenable
- Oxidation resistance
- Corrosion resistance
- Non-magnetic
- NACE compliance
- Weldability
- Cryogenic performance
Applications of Inconel 718 Stud Bolts
Inconel 718 Stud Bolts are specified wherever high-strength fastening is needed under heat, pressure, or corrosive conditions.
- Oil and gas
- Aerospace
- Power generation
- Chemical processing
- Petrochemical
- Marine
- Cryogenic systems
How to Choose the Right Inconel 718 Stud Bolts Supplier?
Not all suppliers deliver the same quality of material and documentation. Choosing the wrong one creates on-site risks, delays project timelines, and can lead to costly failures. Here is what to check before you place an order.
Supplier Selection Criteria
Look for a supplier with direct mill connections for Inconel 718 material. They should be able to provide mill test reports (MTRs) and material traceability documents. Suppliers without proper documentation should not be considered for critical service applications.
Technical Considerations
Confirm that the supplier manufactures to ASTM B637 and threads to ASME B18.2.1 or DIN 976. Check whether the fasteners are solution annealed and age hardened as per AMS 5663 or AMS 5664. Ask specifically for hardness test results and dimensional inspection reports before dispatch.
Quality & Certification Check
Ask for third-party inspection certificates from TUV, Bureau Veritas, SGS, or Lloyd’s. Material certification EN 10204 3.1 or 3.2 check. NACE MR0175 compliance for sour service is confirmed. ISO 9001 and PED certification are a minimum requirement at the manufacturing facility.
Procurement Tips for Bulk Orders
For large quantities, request a first article inspection (FAI) on a sample lot before full production. Agree on lead times, packaging standards (thread protection caps, moisture-proof bags), and labelling requirements. To avoid customs delays on imports, always get a commercial invoice that matches the MTR heat number.
Inconel 718 Stud Bolts Suppliers
Inconel 718 Stud Bolts FAQ's
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