At Unifit Metalloys Inc., we specialize in manufacturing and supplying premium-grade Stainless Steel SMO 254 fasteners designed to meet the critical needs of industries where extreme corrosion resistance is non-negotiable. Sourced from UNS S31254 austenitic stainless steel, these fasteners are engineered to perform in aggressive chloride environments such as seawater, offshore oil & gas, desalination plants, pulp & paper processing and chemical industries. The alloy’s exceptional strength and durability make it a preferred choice for applications where standard stainless steels fall short.
With decades of industry experience, advanced manufacturing facilities, and stringent quality controls, Unifit Metalloys Inc. ensures every fastener meets global standards like ASTM, ASME, and DIN. Our in-house metallurgical expertise, global supply network and commitment to customer-specific solutions position us as a trusted partner for engineering projects worldwide. From standard sizes to custom designs, our SMO 254 fasteners deliver consistent performance, long service life and exceptional value.
Request QuoteWhat are Stainless Steel SMO 254 Fasteners?
Stainless Steel SMO 254 fasteners are fastening components including bolts, nuts, screws, studs and washers manufactured from SMO 254 (UNS S31254), a high-alloy austenitic stainless steel developed for maximum corrosion resistance in highly aggressive chloride-bearing environments. This alloy contains approximately 20% chromium, 18% nickel, 6% molybdenum and nitrogen, giving it superior resistance to pitting and crevice corrosion compared to standard grades like 316L or 904L.
These fasteners are widely used where mechanical strength must be paired with exceptional resistance to seawater, acidic solutions, and halide-rich conditions. They maintain structural integrity under high temperatures and pressures, making them indispensable for critical infrastructure in marine engineering, petrochemicals, desalination systems and industrial fluid handling.
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Types of Stainless Steel SMO 254 Fasteners
SMO 254 fasteners come in multiple forms, each designed to handle specific mechanical and environmental demands. From bolts and nuts that secure heavy-duty structures to washers and screws that provide precision assembly, every variant serves a unique purpose. SMO 254 fasteners come in multiple forms, each designed to handle specific mechanical and environmental demands. The table below highlights the key types, features, and common applications for quick reference:
- SS SMO 254 Structural Bolts
- SS SMO 254 Heavy Hex Bolts
- SS SMO 254 Hex Bolts
- Steel SMO 254 Hexagon Head Bolts
- SS 254 SMO 254 Machine Bolts
- Stainless Steel SMO 254 T Bolts
- Stainless Steel SMO 254 Eye Bolt
- SMO 254 SS Foundation Bolts
- Stainless Steel SMO 254 J Bolts
- SMO 254 SS Button Head Bolt
- SMO 254 Anchor Bolts
- Stainless Steel SMO 254 Long Bolts
- SS SMO 254 Carriage Bolt
- SMO 254 Elevator Bolt
- SMO 254 Timber Bolts
- SS SMO 254 Square Bolt
- SS SMO 254 Metric Bolt
- Stainless Steel SMO 254 Plow Bolts
- Stainless Steel SMO 254 U Bolts
- SMO 254 Flange Bolts
- Stainless Steel SMO 254 Hex Nuts
- SS SMO 254 Heavy Hex Nuts
- Stainless Steel SMO 254 Wing Nuts
- Stainless Steel SMO 254 Hexagon Nuts
- Stainless Steel SMO 254 Cap Nuts
- SMO 254 SS Square Nuts
- SS SMO 254 Coupling Nuts
- Stainless Steel SMO 254 Hex Jam Nuts
- Stainless Steel SMO 254 T-Nuts
- SMO 254 Stainless Steel Eye Nuts
- Stainless Steel SMO 254 Nylock Nuts
- SS SMO 254 High Tensile Nuts
- SMO 254 Stainless Steel Cage Nuts
- SMO 254 Stainless Steel Dome Nuts
- SMO 254 Stainless Steel Knurled Nuts
- SMO 254 SS Keps-K Lock Nuts
- SS SMO 254 Machine Hex Nuts
- Steel SMO 254 Slotted Nuts
- Stainless Steel SMO 254 Plain Washers
- SS SMO 254 Spring Washers
- SS SMO 254 Locking Washer
- Steel SMO 254 Split Washer
- SMO 254 Flat Washers
- SMO 254 Ogee Washers
- SMO 254 Fender Washer
- SS SMO 254 Conical Washers
- SS 254 SMO Serrated Washer
- SMO 254 SS Tab Washers
- Stainless Steel SMO 254 Hex Washer
- SS SMO 254 Countersunk Washer
- SMO 254 SS Dock Washers
- SS SMO 254 Spring Lock Washer
- SMO 254 Stainless Steel Star Washer
- SS SMO 254 Bonded sealing Washer
- SMO 254 Square Washers
- SMO 254 SS Belleville Washer
- SS SMO 254 Socket Set Screw
- SS SMO 254 Self Drilling Screw
- SMO 254 SS Socket Head Cap Screw
- Steel SMO 254 Hex Head Screws
- Stainless Steel SMO 254 Wood Screw
- Stainless Steel SMO 254 Eye Screw
- Stainless Steel SMO 254 Wing Screw
- SS SMO 254 Self Tapping Screws
- Stainless Steel SMO 254 Roofing Screw
- SS SMO 254 Phillips Head Screw
- SMO 254 Decking Screw
- SMO 254 Machine Screw
- SS 254 SMO Thumb Screw
- SMO 254 Drywall Screws
- SMO 254 SS Chipboard Screw
- SMO 254 Metric Set Screws
- Stainless SMO 254 Sems Screw
- SMO 254 Thread Rolling Screw
- SS SMO 254 Full Threaded Stud Bolts
- SS SMO 254 Half Threaded Stud Bolts
- Stainless Steel SMO 254 Threaded Rod
- SS SMO 254 Double Ended Studs
- SS SMO 254 Tap End Stud Bolt
- Stainless Steel SMO 254 Tie Rods
- Stainless Steel SMO 254 Studs
- SS SMO 254 Single End Stud Bolts
- SS SMO 254 Reduced Shank Stud Bolt
- SMO 254 Continuous Threaded Stud
- SS SMO 254 Partial Threads Stud Bolt
- Stainless SMO 254 Heavy Stud Bolts
Stainless Steel SMO 254 Fasteners Specifications
When selecting SMO 254 fasteners, understanding their specifications is crucial to ensuring the right fit for your application. At Unifit Metalloys Inc., we supply SMO 254 fasteners that strictly adhere to international standards, ensuring consistent quality, durability and performance across demanding industries.
| Specification Parameter | Details |
|---|---|
| Material Grade | Stainless Steel SMO® 254 (UNS S31254) |
| Standards | ASTM A193 / ASTM A194, DIN, ISO, BS, ANSI |
| Diameter Range | M1.6 to M100 or as per customer requirement |
| Length | Up to 5 meters (custom lengths available) |
| Thread Type | Metric, UNC, UNF, BSW, Acme, custom threads |
| Finish / Coating | Plain, Hot Dip Galvanized, Zinc Plated, PTFE Coated |
| Corrosion Resistance | Exceptional resistance to pitting, crevice, and chloride stress corrosion cracking |
| Temperature Range | Suitable for cryogenic to high-temperature service |
| Manufacturing Process | Forged, Machined, and Heat-Treated |
Stainless Steel SMO 254 Fasteners Equivalent Materials
SMO® 254 (UNS S31254) fasteners are recognized internationally under various standards and designations. Knowing their equivalents helps engineers, procurement teams and manufacturers ensure material compatibility across different regions and industries.
| Standard / Specification | Equivalent Grade / Designation |
|---|---|
| UNS | S31254 |
| EN/DIN | 1.4547 |
| ASTM / ASME | A182 F44, A240, A276, A479 |
| JIS | SUS 312L |
| AFNOR | Z1CNDU25-20Az |
| ISO | X1CrNiMoN20-18-7 |
Chemical Composition of Stainless Steel SMO 254 Fasteners
The chemical composition of Stainless Steel SMO 254 (UNS S31254) is what gives these fasteners their exceptional resistance to pitting, crevice corrosion, and chloride-induced stress cracking. Here’s the complete breakdown:
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.020 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.010 |
| Silicon (Si) | ≤ 0.80 |
| Chromium (Cr) | 19.5 – 20.5 |
| Nickel (Ni) | 17.5 – 18.5 |
| Molybdenum (Mo) | 6.0 – 6.5 |
| Nitrogen (N) | 0.18 – 0.22 |
| Iron (Fe) | Balance |
The combination of high molybdenum and nitrogen content gives SMO® 254 fasteners superior mechanical strength and outstanding performance in marine and chemical processing industries where conventional stainless steels fail.
Mechanical Properties of Stainless Steel SMO 254 Fasteners
SMO 254 (UNS S31254) fasteners exhibit a remarkable combination of mechanical attributes, including exceptional tensile and yield strength, high elongation, and impressive impact resistance. Below is the table outlining the key mechanical properties of Stainless Steel SMO 254 fasteners:
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 650 MPa |
| Yield Strength (0.2% Proof) | ≥ 300 MPa |
| Elongation | ≥ 35% |
| Hardness (Brinell) | ≤ 223 HB |
| Impact Toughness (Charpy V-notch) | High (Even at sub-zero temperatures) |
| Modulus of Elasticity | ~ 195 GPa |
Stainless Steel SMO 254 Fasteners Sizes
At Unifit Metalloys Inc., we offer SMO 254 fasteners in a wide range of standard and customized sizes to suit diverse industrial applications. The following size charts will help you select the right fastener type for your project requirements:
Stainless Steel SMO 254 Bolts & Screws Sizes
SMO 254 bolts and screws are available in both metric and imperial sizes, with various thread types (UNC, UNF, Metric Coarse, Metric Fine) for superior fastening in marine, chemical, and offshore applications.
| Parameter | Metric | Imperial |
|---|---|---|
| Size Range | M3 – M64 | 3/16” – 2 ½” |
| Length Range | 6 mm – 500 mm | ¼” – 20” |
| Thread Types | UNC, UNF, Metric Coarse, Metric Fine | UNC, UNF, Metric Coarse, Metric Fine |
Stainless Steel SMO 254 Nuts Sizes
Designed to complement SMO 254 bolts and studs, these nuts are ideal for high-load and corrosive service environments.
| Parameter | Metric | Imperial |
|---|---|---|
| Size Range | M3 – M64 | 3/16” – 2 ½” |
| Types Available | Hex Nuts, Heavy Hex Nuts, Lock Nuts | Hex Nuts, Heavy Hex Nuts, Lock Nuts |
Stainless Steel SMO 254 Washers Sizes
SMO 254 washers are used to evenly distribute the load of threaded fasteners and protect surfaces from damage.
| Parameter | Metric | Imperial |
|---|---|---|
| Outer Diameter (OD) | 3 mm – 100 mm | 1/8” – 4” |
| Types Available | Flat, Spring, Fender, Belleville | Flat, Spring, Fender, Belleville |
Stainless Steel SMO 254 Thread Types
Available in multiple threading options to match application needs:
| Thread Type | Description |
|---|---|
| UNC | Unified Coarse Thread – standard general-purpose thread |
| UNF | Unified Fine Thread – higher tensile stress area and better grip |
| Metric Coarse | Standard metric thread for general applications |
| Metric Fine | Higher precision and greater tensile stress capacity |
Why Choose Stainless Steel SMO 254 Fasteners?
Stainless Steel SMO 254 fasteners are the go-to solution for industries where maximum corrosion resistance and superior mechanical performance are non-negotiable. With a Pitting Resistance Equivalent Number (PREN) exceeding 42, they offer exceptional defense against pitting and crevice corrosion in highly aggressive, chloride-rich environments such as seawater, brine and harsh process chemicals. Their advanced alloy composition - rich in molybdenum and nitrogen ensures stable performance where conventional stainless steels are prone to rapid degradation, preventing costly downtime, safety hazards and premature replacements.
Beyond corrosion resistance, SMO 254 fasteners deliver a rare combination of high tensile strength, excellent ductility and outstanding impact toughness even in sub-zero conditions. This enables them to handle fluctuating loads, vibration and severe thermal cycling without compromising integrity. Their proven reliability makes them the first choice for engineers and project managers who demand longevity, operational safety and uncompromising performance in mission-critical applications.
Applications of Stainless Steel SMO 254 Fasteners
SS SMO 254 fasteners are specifically chosen for environments where standard stainless steels fail prematurely, offering unmatched corrosion resistance in high-salinity, high-chloride and chemical-laden conditions. They ensure mechanical integrity in mission-critical assemblies even under thermal cycling, vibration and continuous exposure to aggressive media.
- Marine & Offshore Structures
- Desalination Plants
- Petrochemical & Chemical Processing
- Pulp & Paper Industry
- Food & Beverage Processing
- Power Generation
- Pharmaceutical & Biotechnology
Stainless Steel SMO 254 Fasteners Price
The price of SMO 254 fasteners depends on several factors such as size, type, coating/finish, manufacturing standards and order volume. Being a high-alloy austenitic stainless steel with exceptional corrosion resistance SMO 254 typically falls in a higher price bracket compared to standard stainless grades like 304 or 316. However, its durability in aggressive environments often results in lower lifecycle costs by minimizing replacements and maintenance.
When sourcing SMO 254 fasteners, pricing considerations generally depend on:
- Fastener Type: Bolts, nuts, washers, screws, or custom-made components.
- Size & Thread Specifications: Larger diameters and longer lengths require more material.
- Finish or Coating: Passivation, PTFE coating or other surface treatments can influence cost.
- Quantity Ordered: Bulk orders usually attract better per-unit rates.
- Supplier & Origin: Local stock availability and import duties can impact final cost.
For large-scale projects or specialized applications, it’s advisable to request quotations from multiple suppliers, verify material test certificates (MTC) and compare based on both price and quality assurance.
Trusted Manufacturer & Supplier of Stainless Steel SMO 254 Fasteners
At Unifit Metalloys Inc., we specialize in manufacturing and supplying premium-grade Stainless Steel SMO 254 fasteners that meet the highest industry standards. With years of expertise and advanced production capabilities, we ensure every fastener delivers exceptional strength, precise dimensions and consistent corrosion resistance essential for critical applications.
Our fasteners undergo rigorous quality control processes, including chemical composition analysis, mechanical testing, and dimensional inspections, ensuring compliance with ASTM B479, ASME SB479 and international standards. Serving sectors like offshore, petrochemical, desalination, and heavy engineering, we are committed to timely delivery, technical support and customized solutions that align perfectly with your project requirements. Partner with us for reliable, long-lasting fastening solutions backed by technical excellence and trusted global supply chains.
Request QuoteFrequently Asked Questions Stainless Steel SMO 254 Fasteners
What makes Stainless Steel SMO 254 fasteners better than standard stainless steel grades?
SMO® 254 offers superior corrosion resistance especially against pitting and crevice corrosion in chloride-rich environments along with higher tensile strength and toughness compared to grades like 304 and 316.
Are Stainless Steel SMO 254 fasteners suitable for high-temperature applications?
They maintain good mechanical properties and corrosion resistance at moderately elevated temperatures but are typically used in environments up to about 2100°F (1149°C).
Can SMO 254 fasteners be customized in size and finish?
Yes, manufacturers typically offer custom sizing, threading, and finishes such as passivation or coating to meet specific project needs.
Are SMO 254 fasteners magnetic?
No, SMO 254 is austenitic and non-magnetic, suitable for applications sensitive to magnetic interference.
How do I verify the authenticity and quality of SMO® 254 fasteners?
Request material test certificates (MTC), mechanical and chemical analysis reports and check compliance with international standards from your supplier.