Stainless Steel 304L Stud Bolts
Stainless Steel 304L stud bolts are threaded fasteners made from a low-carbon variant of the 304 austenitic Stainless Steel family. Due to their low carbon content (maximum 0.03%), they are very resistant to sensitisation and intergranular corrosion after welding. They are ASTM A193 Grade B8 and are commonly used for piping, pressure vessels, and flanged joints. SS 304L stud bolts have good tensile strength, excellent oxidation resistance, and high performance in mildly corrosive environments. They are a reliable choice for chemical, food processing, and marine applications where weld-zone integrity is important.
Approx Price Range
The price per kg for SS 304L bolts and the factors that affect its price are explained below.
Price Per Unit / Kg
Pricing for SS 304 bars is ₹140–190/kg. ASTM A193 B8 304L stud bolts are priced at 50% of the round bar rate, which is ₹70–95/kg. Smaller diameters and non-standard lengths may be priced per piece.
Factors Affecting Price
The final price of SS 304L stud bolts varies with the size, quantity, raw material costs, grade certification, surface finish, and thread type.
Types of SS 304L Stud Bolts
SS 304L stud bolts come in several configurations to suit different flange and joint requirements. Here are the most common types.
- Fully Threaded Stud Bolts
- Double-End Stud Bolts
- Tap-End Stud Bolts
- Collar Stud Bolts
- B7M / Equivalent Low-Carbon Grade Stud Bolts
Specifications of Stainless Steel 304L Stud Bolts
The table below covers the key specification standards that govern SS 304L stud bolts.
|
Parameter |
Details |
|
Material Standard |
ASTM A193 / ASME SA193 |
|
Length |
25 mm to 3000 mm (custom available) |
|
Diameter Range |
M6 to M100 / 1/4" to 4" |
|
Finish |
Plain, Passivated, Electropolished |
Chemical Properties of SS 304L Stud Bolts
The low carbon content is what sets 304L apart from standard 304. The table below shows the chemical composition as per ASTM A193.
|
Element |
Min (%) |
Max (%) |
|
Carbon (C) |
– |
0.03 |
|
Manganese (Mn) |
– |
2.00 |
|
Phosphorus (P) |
– |
0.045 |
|
Sulphur (S) |
– |
0.030 |
|
Silicon (Si) |
– |
0.75 |
|
Chromium (Cr) |
18.00 |
20.00 |
|
Nickel (Ni) |
8.00 |
12.00 |
|
Nitrogen (N) |
– |
0.10 |
|
Iron (Fe) |
Balance |
– |
Mechanical Properties of Stainless Steel 304L Stud Bolts
The table below lists the mechanical properties for ASTM A193 B8 (Class 1) and B8 (Class 2) stud bolts.
|
Property |
Class 1 |
Class 2 |
|
Tensile Strength |
515 MPa (75 ksi) min |
690 MPa (100 ksi) min |
|
Yield Strength (0.2% offset) |
205 MPa (30 ksi) min |
450 MPa (65 ksi) min |
|
Elongation |
30% min |
20% min |
|
Reduction of Area |
50% min |
45% min |
|
Hardness (Brinell) |
223 HBW max |
321 HBW max |
Physical Properties of SS 304L Stud Bolts
These are the standard physical properties of the 304L base material used in manufacturing stud bolts.
|
Property |
Value |
|
Density |
7.93 g/cm³ |
|
Melting Point |
1400 – 1455°C |
|
Modulus of Elasticity |
193 GPa |
|
Thermal Conductivity |
16.2 W/m.K at 100°C |
|
Electrical Resistivity |
0.72 µΩ.m |
|
Magnetic Permeability |
Non-magnetic (in annealed state) |
|
Specific Heat Capacity |
500 J/kg.K |
Dimension Chart of SS 304L Stud Bolts
The table below provides standard dimensions for SS 304L Stud Bolts per ASME B16.5 and B7 references, commonly used with raised-face pipe flanges.
|
Nominal Pipe Size (NPS) |
Bolt Diameter (inches) |
Bolt Length (inches) |
No. of Bolts (150 Class) |
|
1/2" |
1/2 |
2-1/2 |
4 |
|
3/4" |
5/8 |
2-3/4 |
4 |
|
1" |
5/8 |
3 |
4 |
|
1-1/2" |
3/4 |
3-1/2 |
4 |
|
2" |
5/8 |
3-1/2 |
8 |
|
3" |
3/4 |
4 |
8 |
|
4" |
3/4 |
4-1/2 |
8 |
|
6" |
3/4 |
5 |
12 |
|
8" |
7/8 |
5-1/2 |
12 |
|
10" |
1 |
6-1/2 |
16 |
|
12" |
1 |
7 |
16 |
Size Chart of Stainless Steel 304L Stud Bolts
The chart below covers metric sizes commonly available from Indian and international suppliers.
|
Diameter (mm) |
Thread Pitch (mm) |
Shank Length Range (mm) |
Weight Per Piece (g, approx.) |
|
M6 |
1.0 |
20 – 150 |
2 – 12 |
|
M8 |
1.25 |
20 – 200 |
4 – 25 |
|
M10 |
1.5 |
25 – 250 |
7 – 50 |
|
M12 |
1.75 |
30 – 300 |
12 – 85 |
|
M16 |
2.0 |
40 – 400 |
28 – 180 |
|
M20 |
2.5 |
50 – 500 |
55 – 340 |
|
M24 |
3.0 |
60 – 600 |
95 – 600 |
|
M30 |
3.5 |
80 – 700 |
190 – 1100 |
|
M36 |
4.0 |
100 – 800 |
325 – 1900 |
Torque Chart of SS 304L Stud Bolts
The right amount of torque provides a good seal without stripping the threads. Use the values below as a starting guide; always follow the equipment manufacturer's specification.
|
Bolt Diameter |
Lubricated Torque (Nm) |
Dry Torque (Nm) |
|
M8 |
12 – 16 |
16 – 22 |
|
M10 |
24 – 32 |
33 – 44 |
|
M12 |
40 – 55 |
56 – 75 |
|
M16 |
100 – 130 |
140 – 180 |
|
M20 |
190 – 250 |
270 – 350 |
|
M24 |
330 – 430 |
460 – 600 |
|
M30 |
660 – 850 |
920 – 1200 |
|
M36 |
1150 – 1480 |
1600 – 2050 |
Key Features of Stainless Steel 304L Stud Bolts
The following features make Stainless Steel 304L stud bolts a preferred choice for demanding industries.
- Low carbon content (0.03% max)
- Intergranular corrosion resistance
- Non-magnetic in the annealed condition
- Wide temperature range
- Compliant with ASTM A193 / ASME SA193
- Good resistance to oxidising environments and mildly acidic or alkaline media.
Applications of Stainless Steel 304L Stud Bolts
These are the industries and systems where ASTM A193 B8 304L stud bolts are regularly used.
- Chemical processing plants
- Food and beverage industry
- Pharmaceutical equipment
- Water treatment facilities
- Marine and offshore structures
- Pulp and paper mills
- Power generation
- Dairy and beverage processing
How to Choose the Right SS 304L Stud Bolt Supplier?
Keep the following things in mind when choosing the right SS 304L stud bolt supplier.
Supplier Selection Criteria
Select a supplier who holds stock of material to ASTM A193 Grade B8 with MTC (Mill Test Certificates) provided with each order. A good supplier will offer dimensional traceability and consistent lead times. Be sure they offer Class 1 and Class 2 options.
Technical Considerations
Check the thread standard required (UNC or metric) and whether the application requires Class 1 or Class 2 mechanical properties. For high-temperature or pressure-rated flanges, check that the studs are tested and certified to the correct pressure class. Always match nut grade to the stud grade (ASTM A194 Gr. 8 for B8 studs).
Quality and Certification Check
Request for lab test reports from NABL-accredited labs or third-party inspection certificates. Verify compliance with ASTM A193, ASME SA193, and the applicable ISO standards. If the project requires, verify that the supplier can issue EN 10204 3.1 or 3.2 certificates.
Procurement Tips for Bulk Orders
If you are buying a larger lot, ask for a price per kilogram; larger orders are usually affordable per unit. Specify finish (plain, passivated, or electropolished) on the purchase order. Verify that the supplier can provide country of origin documentation and export packaging for international projects.
Stainless Steel 304L stud bolts are threaded fasteners made from a low-carbon variant of the 304 austenitic Stainless Steel family. Due to their low carbon content (maximum 0.03%), they are very resistant to sensitisation and intergranular corrosion after welding. They are ASTM A193 Grade B8 and are commonly used for piping, pressure vessels, and flanged joints. SS 304L stud bolts have good tensile strength, excellent oxidation resistance, and high performance in mildly corrosive environments. They are a reliable choice for chemical, food processing, and marine applications where weld-zone integrity is important.
Approx Price Range
The price per kg for SS 304L bolts and the factors that affect its price are explained below.
Price Per Unit / Kg
Pricing for SS 304 bars is ₹140–190/kg. ASTM A193 B8 304L stud bolts are priced at 50% of the round bar rate, which is ₹70–95/kg. Smaller diameters and non-standard lengths may be priced per piece.
Factors Affecting Price
The final price of SS 304L stud bolts varies with the size, quantity, raw material costs, grade certification, surface finish, and thread type.
Types of SS 304L Stud Bolts
SS 304L stud bolts come in several configurations to suit different flange and joint requirements. Here are the most common types.
- Fully Threaded Stud Bolts
- Double-End Stud Bolts
- Tap-End Stud Bolts
- Collar Stud Bolts
- B7M / Equivalent Low-Carbon Grade Stud Bolts
Specifications of Stainless Steel 304L Stud Bolts
The table below covers the key specification standards that govern SS 304L stud bolts.
|
Parameter |
Details |
|
Material Standard |
ASTM A193 / ASME SA193 |
|
Length |
25 mm to 3000 mm (custom available) |
|
Diameter Range |
M6 to M100 / 1/4" to 4" |
|
Finish |
Plain, Passivated, Electropolished |
Chemical Properties of SS 304L Stud Bolts
The low carbon content is what sets 304L apart from standard 304. The table below shows the chemical composition as per ASTM A193.
|
Element |
Min (%) |
Max (%) |
|
Carbon (C) |
– |
0.03 |
|
Manganese (Mn) |
– |
2.00 |
|
Phosphorus (P) |
– |
0.045 |
|
Sulphur (S) |
– |
0.030 |
|
Silicon (Si) |
– |
0.75 |
|
Chromium (Cr) |
18.00 |
20.00 |
|
Nickel (Ni) |
8.00 |
12.00 |
|
Nitrogen (N) |
– |
0.10 |
|
Iron (Fe) |
Balance |
– |
Mechanical Properties of Stainless Steel 304L Stud Bolts
The table below lists the mechanical properties for ASTM A193 B8 (Class 1) and B8 (Class 2) stud bolts.
|
Property |
Class 1 |
Class 2 |
|
Tensile Strength |
515 MPa (75 ksi) min |
690 MPa (100 ksi) min |
|
Yield Strength (0.2% offset) |
205 MPa (30 ksi) min |
450 MPa (65 ksi) min |
|
Elongation |
30% min |
20% min |
|
Reduction of Area |
50% min |
45% min |
|
Hardness (Brinell) |
223 HBW max |
321 HBW max |
Physical Properties of SS 304L Stud Bolts
These are the standard physical properties of the 304L base material used in manufacturing stud bolts.
|
Property |
Value |
|
Density |
7.93 g/cm³ |
|
Melting Point |
1400 – 1455°C |
|
Modulus of Elasticity |
193 GPa |
|
Thermal Conductivity |
16.2 W/m.K at 100°C |
|
Electrical Resistivity |
0.72 µΩ.m |
|
Magnetic Permeability |
Non-magnetic (in annealed state) |
|
Specific Heat Capacity |
500 J/kg.K |
Dimension Chart of SS 304L Stud Bolts
The table below provides standard dimensions for SS 304L Stud Bolts per ASME B16.5 and B7 references, commonly used with raised-face pipe flanges.
|
Nominal Pipe Size (NPS) |
Bolt Diameter (inches) |
Bolt Length (inches) |
No. of Bolts (150 Class) |
|
1/2" |
1/2 |
2-1/2 |
4 |
|
3/4" |
5/8 |
2-3/4 |
4 |
|
1" |
5/8 |
3 |
4 |
|
1-1/2" |
3/4 |
3-1/2 |
4 |
|
2" |
5/8 |
3-1/2 |
8 |
|
3" |
3/4 |
4 |
8 |
|
4" |
3/4 |
4-1/2 |
8 |
|
6" |
3/4 |
5 |
12 |
|
8" |
7/8 |
5-1/2 |
12 |
|
10" |
1 |
6-1/2 |
16 |
|
12" |
1 |
7 |
16 |
Size Chart of Stainless Steel 304L Stud Bolts
The chart below covers metric sizes commonly available from Indian and international suppliers.
|
Diameter (mm) |
Thread Pitch (mm) |
Shank Length Range (mm) |
Weight Per Piece (g, approx.) |
|
M6 |
1.0 |
20 – 150 |
2 – 12 |
|
M8 |
1.25 |
20 – 200 |
4 – 25 |
|
M10 |
1.5 |
25 – 250 |
7 – 50 |
|
M12 |
1.75 |
30 – 300 |
12 – 85 |
|
M16 |
2.0 |
40 – 400 |
28 – 180 |
|
M20 |
2.5 |
50 – 500 |
55 – 340 |
|
M24 |
3.0 |
60 – 600 |
95 – 600 |
|
M30 |
3.5 |
80 – 700 |
190 – 1100 |
|
M36 |
4.0 |
100 – 800 |
325 – 1900 |
Torque Chart of SS 304L Stud Bolts
The right amount of torque provides a good seal without stripping the threads. Use the values below as a starting guide; always follow the equipment manufacturer's specification.
|
Bolt Diameter |
Lubricated Torque (Nm) |
Dry Torque (Nm) |
|
M8 |
12 – 16 |
16 – 22 |
|
M10 |
24 – 32 |
33 – 44 |
|
M12 |
40 – 55 |
56 – 75 |
|
M16 |
100 – 130 |
140 – 180 |
|
M20 |
190 – 250 |
270 – 350 |
|
M24 |
330 – 430 |
460 – 600 |
|
M30 |
660 – 850 |
920 – 1200 |
|
M36 |
1150 – 1480 |
1600 – 2050 |
Key Features of Stainless Steel 304L Stud Bolts
The following features make Stainless Steel 304L stud bolts a preferred choice for demanding industries.
- Low carbon content (0.03% max)
- Intergranular corrosion resistance
- Non-magnetic in the annealed condition
- Wide temperature range
- Compliant with ASTM A193 / ASME SA193
- Good resistance to oxidising environments and mildly acidic or alkaline media.
Applications of Stainless Steel 304L Stud Bolts
These are the industries and systems where ASTM A193 B8 304L stud bolts are regularly used.
- Chemical processing plants
- Food and beverage industry
- Pharmaceutical equipment
- Water treatment facilities
- Marine and offshore structures
- Pulp and paper mills
- Power generation
- Dairy and beverage processing
How to Choose the Right SS 304L Stud Bolt Supplier?
Keep the following things in mind when choosing the right SS 304L stud bolt supplier.
Supplier Selection Criteria
Select a supplier who holds stock of material to ASTM A193 Grade B8 with MTC (Mill Test Certificates) provided with each order. A good supplier will offer dimensional traceability and consistent lead times. Be sure they offer Class 1 and Class 2 options.
Technical Considerations
Check the thread standard required (UNC or metric) and whether the application requires Class 1 or Class 2 mechanical properties. For high-temperature or pressure-rated flanges, check that the studs are tested and certified to the correct pressure class. Always match nut grade to the stud grade (ASTM A194 Gr. 8 for B8 studs).
Quality and Certification Check
Request for lab test reports from NABL-accredited labs or third-party inspection certificates. Verify compliance with ASTM A193, ASME SA193, and the applicable ISO standards. If the project requires, verify that the supplier can issue EN 10204 3.1 or 3.2 certificates.
Procurement Tips for Bulk Orders
If you are buying a larger lot, ask for a price per kilogram; larger orders are usually affordable per unit. Specify finish (plain, passivated, or electropolished) on the purchase order. Verify that the supplier can provide country of origin documentation and export packaging for international projects.
Stainless Steel 304L Stud Bolts Suppliers
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Stainless Steel 304L Stud Bolts FAQ's
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