Stainless Steel SMO 254 Fasteners
Stainless Steel 254 SMO Fasteners are threaded and non-threaded fastening components made from UNS S31254, a super-austenitic stainless steel alloyed with high molybdenum (6-6.5%), nitrogen, and copper. These enhancements offer SMO 254 a much higher resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking than typical grades like 304 or 316.
Fasteners include bolts, nuts, screws, studs, washers, and anchor bolts. They perform well in harsh chemical environments without coatings and maintain mechanical properties at high temperatures. Their combination of a high pitting resistance equivalent (PREN > 42), tensile strength, and weldability makes them the preferred choice in offshore, desalination, chemical processing, and pulp and paper applications where standard austenitic grades fail.
Stainless Steel 254 SMO Fasteners Price
Stainless Steel 254 SMO Fasteners are priced in heavy industries for their resistance to chloride pitting and stress corrosion cracking. Procurement professionals analyse ultra-austenitic grade market prices to balance long-term project lifecycles and immediate material costs in severe chemical and marine applications.
Price Per Unit / Kg
The price of a 254 SMO fastener ranges from ₹ 400 to ₹ 1,800 per piece, depending on type, size, and finish. SMO 254 Fasteners Price in India: Per kg, the price of SMO 254 Fasteners in India ranges from Rs. 1,200 to Rs. 3,500. International prices track LME nickel rates and molybdenum market movements closely, as SMO 254 contains substantially higher alloy content than standard stainless grades.
Factors Affecting Price
The cost of 254 SMO fasteners is largely driven by the high nickel and molybdenum content, making them more expensive than ordinary grades. Pricing is based on NORSOK or ASTM certifications, specific electropolished finishes, and complicated thread machining. However, the use of bulk order volumes and improved logistics can lead to significant reductions in the final landed project costs.
Types of Stainless Steel 254 SMO Fasteners
Below, we have detailed the various configurations available to meet your structural and industrial requirements:
- SMO 254 Anchor Bolts
- SMO 254 Foundation Bolts
- SMO 254 Expansion Anchors
- SMO 254 Chemical Anchors
- SMO 254 Wedge Anchors
- SMO 254 Sleeve Anchors
- SMO 254 Drop-In Anchors
- SMO 254 L-Anchors
- SMO 254 J-Anchors
Specifications of Stainless Steel 254 SMO Fasteners
The specifications of Stainless Steel 254 SMO Fasteners, including length, size, and form, are listed in the table below.
|
Feature |
Specification Details |
|
Standard |
ASTM A 182 / ASME SA 182 |
|
Size |
M3 - M100 | 3/6″ - 4″ | Custom Sizes |
|
Fasteners Length |
3 mm - 200 mm | Custom Sizes |
|
Nuts Size |
M3 - M56 | 3/6" to 2" | Custom Sizes |
|
Washers Size |
M3 - M56 | 3/6" to 2" | Custom Sizes |
|
Dimensions |
DIN 931, 933, 934, 7991, 976, 125, ASME B18.2.1, B18.3 |
|
Threads available |
UNF, BSW, BSF, METRIC, UNC, or as required |
|
Form |
Hex, Threading, Square, Round, as per Gauge Etc. |
|
Surface Treatment |
Passivation/plain |
|
Packing |
IN BULK: carton, pallet, Small Boxes or customer request |
|
Test Certificate |
As per EN 10204 / 3.1 Manufacturer Test Certificate, PED 97/23/EC Certified, Merkblatt AD 2000 W2 Certified |
|
Certification |
Dual Certified As per ASTM & ASME Codes |
Chemical Properties of Stainless Steel 254 SMO Fasteners
The chemical composition of Stainless Steel 254 SMO Fasteners, including its proportions, is listed in the table below.
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
N |
Cu |
|
SMO 254 |
0.020 |
1.0 |
0.80 |
0.030 |
0.010 |
20.5 |
6.5 |
17.5-18.5 |
0.22 |
1.00 |
Mechanical Properties of Stainless Steel 254 SMO Fasteners
Stainless Steel 254 SMO Fasteners have the following mechanical properties: tensile, yield, and elongation are shown in detail in the table.
|
Property |
Value |
|
Tensile Strength |
650 MPa min |
|
Yield Strength (0.2% Offset) |
300 MPa min |
|
Elongation (% in 50 mm) |
35% min |
|
Hardness (Brinell) |
217 HB max |
Physical Properties of Stainless Steel 254 SMO Fasteners
The physical properties of Stainless Steel 254 SMO Fasteners are listed in the table below, along with density and thermal conductivity.
|
Grade |
Density (kg/m³) |
Elastic Modulus (GPa) |
Mean Co-eff of Thermal Expansion (µm/m/°C) 0–100°C |
Thermal Conductivity (W/m.K) at 100°C |
Specific Heat (J/kg.K) |
Elec Resistivity (nΩ.m) |
|
SMO 254 |
8000 |
195 |
16.5 |
14.0 |
500 |
850 |
Dimension Chart of Stainless Steel 254 SMO Fasteners
Below is the dimensional data of Stainless Steel Fasteners, including body diameter, head dimensions, and thread lengths, in a formatted way.
|
Nominal Size (inch) |
Body Dia. (Max) |
Body Dia. (Min) |
Width Across Flats (Max) |
Width Across Flats (Min) |
Width Across Corners (Max) |
Width Across Corners (Min) |
Head Height (Basic) |
Head Height (Min) |
Radius of Fillet (Max) |
Thread Length (≤ 6") |
Thread Length (> 6") |
|
1/4 |
0.260 |
0.237 |
0.438 |
0.425 |
0.505 |
0.484 |
11/64 |
0.150 |
0.03 |
0.750 |
1.000 |
|
5/16 |
0.324 |
0.298 |
0.500 |
0.484 |
0.577 |
0.552 |
7/32 |
0.195 |
0.03 |
0.875 |
1.125 |
|
3/8 |
0.388 |
0.360 |
0.562 |
0.544 |
0.650 |
0.621 |
1/4 |
0.226 |
0.03 |
1.000 |
1.250 |
|
7/16 |
0.452 |
0.421 |
0.625 |
0.603 |
0.722 |
0.687 |
19/64 |
0.272 |
0.03 |
1.125 |
1.375 |
|
1/2 |
0.515 |
0.482 |
0.750 |
0.725 |
0.866 |
0.826 |
11/32 |
0.302 |
0.03 |
1.250 |
1.500 |
|
5/8 |
0.642 |
0.605 |
0.938 |
0.906 |
1.083 |
1.033 |
27/64 |
0.378 |
0.06 |
1.500 |
1.750 |
|
3/4 |
0.768 |
0.729 |
1.125 |
1.088 |
1.299 |
1.240 |
1/2 |
0.455 |
0.06 |
1.750 |
2.000 |
|
7/8 |
0.895 |
0.852 |
1.312 |
1.269 |
1.516 |
1.447 |
37/64 |
0.531 |
0.06 |
2.000 |
2.250 |
|
1 |
1.022 |
0.976 |
1.500 |
1.450 |
1.732 |
1.653 |
43/64 |
0.591 |
0.09 |
2.250 |
2.500 |
|
1 1/8 |
1.149 |
1.098 |
1.688 |
1.631 |
1.949 |
1.859 |
3/4 |
0.658 |
0.09 |
2.500 |
2.750 |
|
1 1/4 |
1.277 |
1.223 |
1.875 |
1.812 |
2.165 |
2.066 |
27/32 |
0.749 |
0.09 |
2.750 |
3.000 |
|
1 3/8 |
1.404 |
1.345 |
2.062 |
1.994 |
2.382 |
2.273 |
29/32 |
0.810 |
0.09 |
3.000 |
3.250 |
|
1 1/2 |
1.531 |
1.470 |
2.250 |
2.175 |
2.598 |
2.481 |
1 |
0.902 |
0.09 |
3.250 |
3.500 |
|
1 5/8 |
1.658 |
1.591 |
2.438 |
2.356 |
2.815 |
2.616 |
1 3/32 |
0.978 |
0.09 |
3.500 |
3.750 |
|
1 3/4 |
1.785 |
1.716 |
2.625 |
2.538 |
3.031 |
2.893 |
1 5/32 |
1.054 |
0.12 |
3.750 |
4.000 |
|
1 7/8 |
1.912 |
1.839 |
2.812 |
2.719 |
3.248 |
3.099 |
1 1/4 |
1.130 |
0.12 |
4.000 |
4.250 |
|
2 |
2.039 |
1.964 |
3.000 |
2.900 |
3.464 |
3.306 |
1 11/32 |
1.175 |
0.12 |
4.250 |
4.500 |
|
2 1/4 |
2.305 |
2.214 |
3.375 |
3.262 |
3.897 |
3.719 |
1 1/2 |
1.327 |
0.19 |
4.750 |
5.000 |
|
2 1/2 |
2.559 |
2.461 |
3.750 |
3.625 |
4.330 |
4.133 |
1 21/32 |
1.479 |
0.19 |
5.250 |
5.500 |
|
2 3/4 |
2.827 |
2.711 |
4.125 |
3.988 |
4.763 |
4.546 |
1 13/16 |
1.632 |
0.19 |
5.750 |
6.000 |
|
3 |
3.081 |
2.961 |
4.500 |
4.350 |
5.196 |
4.959 |
2 |
1.815 |
0.19 |
6.250 |
6.500 |
|
3 1/4 |
3.335 |
3.210 |
4.875 |
4.712 |
5.629 |
5.372 |
2 3/16 |
1.936 |
0.19 |
6.750 |
7.000 |
|
3 1/2 |
3.589 |
3.461 |
5.250 |
5.075 |
6.062 |
5.786 |
2 5/16 |
2.057 |
0.19 |
7.250 |
7.500 |
|
3 3/4 |
3.858 |
3.726 |
5.625 |
5.437 |
6.495 |
6.198 |
2 1/2 |
2.241 |
0.19 |
7.750 |
8.000 |
|
4 |
4.111 |
3.975 |
6.000 |
Size Chart of Stainless Steel 254 SMO Fasteners
Please refer to the detailed size charts provided below to identify the specific dimensions for washers and nuts.
|
Fastener Type |
Size |
Inside Diameter / Dia* |
Outside Diameter |
Thickness / Height |
|
Flat Washer |
#2 |
3/32" |
1/4" |
0.020" |
|
Flat Washer |
#4 |
1/8" |
5/16" |
0.032" |
|
Flat Washer |
#6 |
5/32" |
3/8" |
0.049" |
|
Flat Washer |
#8 |
3/16" |
7/16" |
0.049" |
|
Hex Nut |
M2 |
4 mm |
— |
1.6 mm |
|
Hex Nut |
M2.5 |
5 mm |
— |
2.0 mm |
|
Hex Nut |
M3 |
5.5 mm |
— |
2.4 mm |
|
Hex Nut |
M4 |
7 mm |
— |
3.2 mm |
|
Hex Nut |
M5 |
8 mm |
— |
4.0 mm |
|
Hex Nut |
M6 |
10 mm |
— |
5.0 mm |
|
Hex Nut |
M7 |
11 mm |
— |
5.5 mm |
|
Hex Nut |
M8 |
13 mm |
— |
6.5 mm |
|
Hex Nut |
M10 |
17 mm |
— |
8.0 mm |
|
Hex Nut |
M12 |
19 mm |
— |
10.0 mm |
|
Hex Nut |
M14 |
22 mm |
— |
11.0 mm |
|
Hex Nut |
M16 |
24 mm |
— |
13.0 mm |
|
Hex Nut |
M18 |
27 mm |
— |
15.0 mm |
|
Hex Nut |
M20 |
30 mm |
— |
Torque Chart of Stainless Steel 254 SMO Fasteners
The following table shows the detailed torque values in the following chart.
|
Bolt Size |
Threads Per Inch |
Standard Dry Torque (Nm) |
Lubricated Torque (Nm) |
|
M6 |
— |
8 |
6 |
|
M8 |
— |
20 |
15 |
|
M10 |
— |
40 |
30 |
|
M12 |
— |
70 |
52 |
|
M16 |
— |
170 |
128 |
|
M20 |
— |
330 |
250 |
|
M24 |
— |
570 |
430 |
|
M30 |
— |
1130 |
850 |
|
M36 |
— |
1960 |
1470 |
Torque values are indicative for dry conditions. Confirm with your structural engineer for all critical joint applications.
Key Features of Stainless Steel 254 SMO Fasteners
Please refer to the following features that define the performance of these components:
- Chloride-rich environment performance
- Stress corrosion cracking resistance
- Non-magnetic (solution-annealed)
- High nitrogen content
- Standard welding compatibility
- Electropolished finish availability
- Minimal maintenance requirements
Applications of Stainless Steel 254 SMO Fasteners
The following list identifies the key sectors and environments where these products are used:
- Offshore oil and gas platforms
- Desalination and reverse osmosis plants
- Pulp and paper bleaching equipment
- Chemical processing plants
- Flue gas desulphurisation (FGD) systems
- Pharmaceutical and biotechnology equipment
- Marine heat exchangers
- Food and beverage processing
- Coastal infrastructure
- Semiconductor cleanrooms
How to Choose the Right Stainless Steel 254 SMO Fasteners Supplier?
Before placing an order for the Stainless Steel 254 SMO Fasteners, please consider the following points, as they will help your procurement process to be easier and get the right material as per your project needs.
Supplier Selection Criteria
Verify that the 254 SMO fastener suppliers provide mill test certificates (MTC) with full traceability, heat number, lot number, and material composition. SMO 254 is a premium alloy and is frequently misrepresented as 316 by unverified traders. Always demand EN 10204 3.1 or 3.2 certification, depending on your project specification. Confirm the supplier understands and can differentiate between UNS S31254, 1.4547, and similar designations before placing an order.
Technical Considerations
Ask the provider which thread requirements they can give. Indian industrial projects mainly use DIN, but offshore and EPC contracts generally stipulate ANSI/ASME threads. Flanged pressure joint fasteners shall meet ASTM A193 B8M (bolts) and A194 Grade 8M (nuts). Verify supplier quotes against specified specifications and not generic “SMO 254” stock that may not meet tensile property requirements.
Quality & Certification Check
Preference will be given to vendors having ISO 9001:2015 certification and able to provide a third-party inspection report from SGS, BV, TUV, or Lloyd's. Electropolished finishes need surface roughness certifications. For offshore and NORSOK projects, the documentation of NORSOK MDS D42 compliance shall be supplied before a commitment to a source.
Procurement Tips for Bulk Orders
Negotiate better pricing and simplify quality documentation by consolidating fastener types with a single provider. Vendor-qualified provider cuts down inspection overhead for repeat procurement on each order. Request MTCs from two or three providers for initial buys. This authenticates the material and gives a credible pricing benchmark for the grade.
Stainless Steel 254 SMO Fasteners are threaded and non-threaded fastening components made from UNS S31254, a super-austenitic stainless steel alloyed with high molybdenum (6-6.5%), nitrogen, and copper. These enhancements offer SMO 254 a much higher resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking than typical grades like 304 or 316.
Fasteners include bolts, nuts, screws, studs, washers, and anchor bolts. They perform well in harsh chemical environments without coatings and maintain mechanical properties at high temperatures. Their combination of a high pitting resistance equivalent (PREN > 42), tensile strength, and weldability makes them the preferred choice in offshore, desalination, chemical processing, and pulp and paper applications where standard austenitic grades fail.
Stainless Steel 254 SMO Fasteners Price
Stainless Steel 254 SMO Fasteners are priced in heavy industries for their resistance to chloride pitting and stress corrosion cracking. Procurement professionals analyse ultra-austenitic grade market prices to balance long-term project lifecycles and immediate material costs in severe chemical and marine applications.
Price Per Unit / Kg
The price of a 254 SMO fastener ranges from ₹ 400 to ₹ 1,800 per piece, depending on type, size, and finish. SMO 254 Fasteners Price in India: Per kg, the price of SMO 254 Fasteners in India ranges from Rs. 1,200 to Rs. 3,500. International prices track LME nickel rates and molybdenum market movements closely, as SMO 254 contains substantially higher alloy content than standard stainless grades.
Factors Affecting Price
The cost of 254 SMO fasteners is largely driven by the high nickel and molybdenum content, making them more expensive than ordinary grades. Pricing is based on NORSOK or ASTM certifications, specific electropolished finishes, and complicated thread machining. However, the use of bulk order volumes and improved logistics can lead to significant reductions in the final landed project costs.
Types of Stainless Steel 254 SMO Fasteners
Below, we have detailed the various configurations available to meet your structural and industrial requirements:
- SMO 254 Anchor Bolts
- SMO 254 Foundation Bolts
- SMO 254 Expansion Anchors
- SMO 254 Chemical Anchors
- SMO 254 Wedge Anchors
- SMO 254 Sleeve Anchors
- SMO 254 Drop-In Anchors
- SMO 254 L-Anchors
- SMO 254 J-Anchors
Specifications of Stainless Steel 254 SMO Fasteners
The specifications of Stainless Steel 254 SMO Fasteners, including length, size, and form, are listed in the table below.
|
Feature |
Specification Details |
|
Standard |
ASTM A 182 / ASME SA 182 |
|
Size |
M3 - M100 | 3/6″ - 4″ | Custom Sizes |
|
Fasteners Length |
3 mm - 200 mm | Custom Sizes |
|
Nuts Size |
M3 - M56 | 3/6" to 2" | Custom Sizes |
|
Washers Size |
M3 - M56 | 3/6" to 2" | Custom Sizes |
|
Dimensions |
DIN 931, 933, 934, 7991, 976, 125, ASME B18.2.1, B18.3 |
|
Threads available |
UNF, BSW, BSF, METRIC, UNC, or as required |
|
Form |
Hex, Threading, Square, Round, as per Gauge Etc. |
|
Surface Treatment |
Passivation/plain |
|
Packing |
IN BULK: carton, pallet, Small Boxes or customer request |
|
Test Certificate |
As per EN 10204 / 3.1 Manufacturer Test Certificate, PED 97/23/EC Certified, Merkblatt AD 2000 W2 Certified |
|
Certification |
Dual Certified As per ASTM & ASME Codes |
Chemical Properties of Stainless Steel 254 SMO Fasteners
The chemical composition of Stainless Steel 254 SMO Fasteners, including its proportions, is listed in the table below.
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
N |
Cu |
|
SMO 254 |
0.020 |
1.0 |
0.80 |
0.030 |
0.010 |
20.5 |
6.5 |
17.5-18.5 |
0.22 |
1.00 |
Mechanical Properties of Stainless Steel 254 SMO Fasteners
Stainless Steel 254 SMO Fasteners have the following mechanical properties: tensile, yield, and elongation are shown in detail in the table.
|
Property |
Value |
|
Tensile Strength |
650 MPa min |
|
Yield Strength (0.2% Offset) |
300 MPa min |
|
Elongation (% in 50 mm) |
35% min |
|
Hardness (Brinell) |
217 HB max |
Physical Properties of Stainless Steel 254 SMO Fasteners
The physical properties of Stainless Steel 254 SMO Fasteners are listed in the table below, along with density and thermal conductivity.
|
Grade |
Density (kg/m³) |
Elastic Modulus (GPa) |
Mean Co-eff of Thermal Expansion (µm/m/°C) 0–100°C |
Thermal Conductivity (W/m.K) at 100°C |
Specific Heat (J/kg.K) |
Elec Resistivity (nΩ.m) |
|
SMO 254 |
8000 |
195 |
16.5 |
14.0 |
500 |
850 |
Dimension Chart of Stainless Steel 254 SMO Fasteners
Below is the dimensional data of Stainless Steel Fasteners, including body diameter, head dimensions, and thread lengths, in a formatted way.
|
Nominal Size (inch) |
Body Dia. (Max) |
Body Dia. (Min) |
Width Across Flats (Max) |
Width Across Flats (Min) |
Width Across Corners (Max) |
Width Across Corners (Min) |
Head Height (Basic) |
Head Height (Min) |
Radius of Fillet (Max) |
Thread Length (≤ 6") |
Thread Length (> 6") |
|
1/4 |
0.260 |
0.237 |
0.438 |
0.425 |
0.505 |
0.484 |
11/64 |
0.150 |
0.03 |
0.750 |
1.000 |
|
5/16 |
0.324 |
0.298 |
0.500 |
0.484 |
0.577 |
0.552 |
7/32 |
0.195 |
0.03 |
0.875 |
1.125 |
|
3/8 |
0.388 |
0.360 |
0.562 |
0.544 |
0.650 |
0.621 |
1/4 |
0.226 |
0.03 |
1.000 |
1.250 |
|
7/16 |
0.452 |
0.421 |
0.625 |
0.603 |
0.722 |
0.687 |
19/64 |
0.272 |
0.03 |
1.125 |
1.375 |
|
1/2 |
0.515 |
0.482 |
0.750 |
0.725 |
0.866 |
0.826 |
11/32 |
0.302 |
0.03 |
1.250 |
1.500 |
|
5/8 |
0.642 |
0.605 |
0.938 |
0.906 |
1.083 |
1.033 |
27/64 |
0.378 |
0.06 |
1.500 |
1.750 |
|
3/4 |
0.768 |
0.729 |
1.125 |
1.088 |
1.299 |
1.240 |
1/2 |
0.455 |
0.06 |
1.750 |
2.000 |
|
7/8 |
0.895 |
0.852 |
1.312 |
1.269 |
1.516 |
1.447 |
37/64 |
0.531 |
0.06 |
2.000 |
2.250 |
|
1 |
1.022 |
0.976 |
1.500 |
1.450 |
1.732 |
1.653 |
43/64 |
0.591 |
0.09 |
2.250 |
2.500 |
|
1 1/8 |
1.149 |
1.098 |
1.688 |
1.631 |
1.949 |
1.859 |
3/4 |
0.658 |
0.09 |
2.500 |
2.750 |
|
1 1/4 |
1.277 |
1.223 |
1.875 |
1.812 |
2.165 |
2.066 |
27/32 |
0.749 |
0.09 |
2.750 |
3.000 |
|
1 3/8 |
1.404 |
1.345 |
2.062 |
1.994 |
2.382 |
2.273 |
29/32 |
0.810 |
0.09 |
3.000 |
3.250 |
|
1 1/2 |
1.531 |
1.470 |
2.250 |
2.175 |
2.598 |
2.481 |
1 |
0.902 |
0.09 |
3.250 |
3.500 |
|
1 5/8 |
1.658 |
1.591 |
2.438 |
2.356 |
2.815 |
2.616 |
1 3/32 |
0.978 |
0.09 |
3.500 |
3.750 |
|
1 3/4 |
1.785 |
1.716 |
2.625 |
2.538 |
3.031 |
2.893 |
1 5/32 |
1.054 |
0.12 |
3.750 |
4.000 |
|
1 7/8 |
1.912 |
1.839 |
2.812 |
2.719 |
3.248 |
3.099 |
1 1/4 |
1.130 |
0.12 |
4.000 |
4.250 |
|
2 |
2.039 |
1.964 |
3.000 |
2.900 |
3.464 |
3.306 |
1 11/32 |
1.175 |
0.12 |
4.250 |
4.500 |
|
2 1/4 |
2.305 |
2.214 |
3.375 |
3.262 |
3.897 |
3.719 |
1 1/2 |
1.327 |
0.19 |
4.750 |
5.000 |
|
2 1/2 |
2.559 |
2.461 |
3.750 |
3.625 |
4.330 |
4.133 |
1 21/32 |
1.479 |
0.19 |
5.250 |
5.500 |
|
2 3/4 |
2.827 |
2.711 |
4.125 |
3.988 |
4.763 |
4.546 |
1 13/16 |
1.632 |
0.19 |
5.750 |
6.000 |
|
3 |
3.081 |
2.961 |
4.500 |
4.350 |
5.196 |
4.959 |
2 |
1.815 |
0.19 |
6.250 |
6.500 |
|
3 1/4 |
3.335 |
3.210 |
4.875 |
4.712 |
5.629 |
5.372 |
2 3/16 |
1.936 |
0.19 |
6.750 |
7.000 |
|
3 1/2 |
3.589 |
3.461 |
5.250 |
5.075 |
6.062 |
5.786 |
2 5/16 |
2.057 |
0.19 |
7.250 |
7.500 |
|
3 3/4 |
3.858 |
3.726 |
5.625 |
5.437 |
6.495 |
6.198 |
2 1/2 |
2.241 |
0.19 |
7.750 |
8.000 |
|
4 |
4.111 |
3.975 |
6.000 |
Size Chart of Stainless Steel 254 SMO Fasteners
Please refer to the detailed size charts provided below to identify the specific dimensions for washers and nuts.
|
Fastener Type |
Size |
Inside Diameter / Dia* |
Outside Diameter |
Thickness / Height |
|
Flat Washer |
#2 |
3/32" |
1/4" |
0.020" |
|
Flat Washer |
#4 |
1/8" |
5/16" |
0.032" |
|
Flat Washer |
#6 |
5/32" |
3/8" |
0.049" |
|
Flat Washer |
#8 |
3/16" |
7/16" |
0.049" |
|
Hex Nut |
M2 |
4 mm |
— |
1.6 mm |
|
Hex Nut |
M2.5 |
5 mm |
— |
2.0 mm |
|
Hex Nut |
M3 |
5.5 mm |
— |
2.4 mm |
|
Hex Nut |
M4 |
7 mm |
— |
3.2 mm |
|
Hex Nut |
M5 |
8 mm |
— |
4.0 mm |
|
Hex Nut |
M6 |
10 mm |
— |
5.0 mm |
|
Hex Nut |
M7 |
11 mm |
— |
5.5 mm |
|
Hex Nut |
M8 |
13 mm |
— |
6.5 mm |
|
Hex Nut |
M10 |
17 mm |
— |
8.0 mm |
|
Hex Nut |
M12 |
19 mm |
— |
10.0 mm |
|
Hex Nut |
M14 |
22 mm |
— |
11.0 mm |
|
Hex Nut |
M16 |
24 mm |
— |
13.0 mm |
|
Hex Nut |
M18 |
27 mm |
— |
15.0 mm |
|
Hex Nut |
M20 |
30 mm |
— |
Torque Chart of Stainless Steel 254 SMO Fasteners
The following table shows the detailed torque values in the following chart.
|
Bolt Size |
Threads Per Inch |
Standard Dry Torque (Nm) |
Lubricated Torque (Nm) |
|
M6 |
— |
8 |
6 |
|
M8 |
— |
20 |
15 |
|
M10 |
— |
40 |
30 |
|
M12 |
— |
70 |
52 |
|
M16 |
— |
170 |
128 |
|
M20 |
— |
330 |
250 |
|
M24 |
— |
570 |
430 |
|
M30 |
— |
1130 |
850 |
|
M36 |
— |
1960 |
1470 |
Torque values are indicative for dry conditions. Confirm with your structural engineer for all critical joint applications.
Key Features of Stainless Steel 254 SMO Fasteners
Please refer to the following features that define the performance of these components:
- Chloride-rich environment performance
- Stress corrosion cracking resistance
- Non-magnetic (solution-annealed)
- High nitrogen content
- Standard welding compatibility
- Electropolished finish availability
- Minimal maintenance requirements
Applications of Stainless Steel 254 SMO Fasteners
The following list identifies the key sectors and environments where these products are used:
- Offshore oil and gas platforms
- Desalination and reverse osmosis plants
- Pulp and paper bleaching equipment
- Chemical processing plants
- Flue gas desulphurisation (FGD) systems
- Pharmaceutical and biotechnology equipment
- Marine heat exchangers
- Food and beverage processing
- Coastal infrastructure
- Semiconductor cleanrooms
How to Choose the Right Stainless Steel 254 SMO Fasteners Supplier?
Before placing an order for the Stainless Steel 254 SMO Fasteners, please consider the following points, as they will help your procurement process to be easier and get the right material as per your project needs.
Supplier Selection Criteria
Verify that the 254 SMO fastener suppliers provide mill test certificates (MTC) with full traceability, heat number, lot number, and material composition. SMO 254 is a premium alloy and is frequently misrepresented as 316 by unverified traders. Always demand EN 10204 3.1 or 3.2 certification, depending on your project specification. Confirm the supplier understands and can differentiate between UNS S31254, 1.4547, and similar designations before placing an order.
Technical Considerations
Ask the provider which thread requirements they can give. Indian industrial projects mainly use DIN, but offshore and EPC contracts generally stipulate ANSI/ASME threads. Flanged pressure joint fasteners shall meet ASTM A193 B8M (bolts) and A194 Grade 8M (nuts). Verify supplier quotes against specified specifications and not generic “SMO 254” stock that may not meet tensile property requirements.
Quality & Certification Check
Preference will be given to vendors having ISO 9001:2015 certification and able to provide a third-party inspection report from SGS, BV, TUV, or Lloyd's. Electropolished finishes need surface roughness certifications. For offshore and NORSOK projects, the documentation of NORSOK MDS D42 compliance shall be supplied before a commitment to a source.
Procurement Tips for Bulk Orders
Negotiate better pricing and simplify quality documentation by consolidating fastener types with a single provider. Vendor-qualified provider cuts down inspection overhead for repeat procurement on each order. Request MTCs from two or three providers for initial buys. This authenticates the material and gives a credible pricing benchmark for the grade.
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