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Stainless Steel 309 fasteners are high-quality, corrosion-resistant components widely used in industrial, commercial, and household applications. They are an economical alternative to the more expensive 304 grade while still offering excellent strength and durability in light-to-medium duty environments.
SS309 is an austenitic stainless steel containing chromium, nickel, and manganese. The combination of these elements provides a balance of mechanical strength, corrosion resistance, and formability. Its lower nickel content makes it cost-effective without compromising essential performance.
These fasteners are available in various forms including machine screws, hex bolts, nuts, washers, self-tapping screws, and threaded rods. Both metric and imperial sizes are available, making them versatile for multiple applications.
While SS309 does not offer the same corrosion resistance as 304 or 316, it is well-suited for indoor environments and lightly corrosive conditions. It resists rusting in typical household, appliance, and furniture applications.
SS309 fasteners have good tensile and yield strengths, making them suitable for assembly and fastening tasks that do not involve extreme loads. They also maintain adequate toughness for machining, bending, and forming operations.
These fasteners come in several finishes including plain bright, passivated, and electroplated. Custom finishes can also be applied for specific aesthetic or functional requirements, such as enhanced corrosion protection or polished surfaces.
Stainless Steel 309 fasteners are commonly used in furniture manufacturing, household appliances, electrical enclosures, indoor construction, joinery, and light structural fittings. Their cost-effectiveness makes them popular in large-scale production projects.
The key advantages of SS309 fasteners include affordability, moderate corrosion resistance, ease of machining, and availability in a wide range of sizes and forms. They provide reliable performance in non-critical environments.
Specification Table
| Property | Specification / Standard |
|---|---|
| Material Grade | SS 309 / UNS S30900 |
| Type | Bolts, Nuts, Screws, Studs, Washers |
| Standards | ASTM A193 / A194, ASME B18.2.1 / B18.2.2 |
| Thread Type | Metric / UNC / UNF / Special Threads |
| Finish | Natural, Polished, Passivated |
| Size Range | M3 to M36 / 1/8" to 2" |
| Length Range | 6 mm to 300 mm / 1/4" to 12" |
| Application | High Temperature & Corrosion-Resistant Industrial Environments |
| Hardness | HRB 80 approx. |
Chemical Composition (Typical ranges for SS309)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.03 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 22.0 – 24.0 |
| Nickel (Ni) | 12.0 – 15.0 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength (UTS) | 515 – 750 | MPa |
| Yield Strength (0.2% Offset) | 205 – 310 | MPa |
| Elongation (in 50 mm) | 40 – 60 | % |
| Hardness (HRB) | 80 max | HRB |
| Modulus of Elasticity | 200 | GPa |
| Shear Strength | 345 – 520 | MPa |
Equivalent Grades
| Standard / Organization | Equivalent Grade |
|---|---|
| UNS | S30900 |
| EN / DIN | 1.4841 |
| JIS | SNWM 309 |
| BS | 308S15 |
| ASTM / ASME | AISI 309 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Size (M / Inch) | Thread Pitch (mm / TPI) | Length (mm / Inch) | Weight per Piece (kg) |
|---|---|---|---|
| M6 / 1/4" | 1.0 / 20 | 12 – 50 / 1/2" – 2" | 0.010 – 0.025 |
| M8 / 5/16" | 1.25 / 18 | 16 – 80 / 5/8" – 3" | 0.020 – 0.060 |
| M10 / 3/8" | 1.5 / 16 | 20 – 100 / 3/4" – 4" | 0.040 – 0.120 |
| M12 / 1/2" | 1.75 / 13 | 25 – 120 / 1" – 5" | 0.080 – 0.200 |
| M16 / 5/8" | 2.0 / 11 | 30 – 150 / 1.25" – 6" | 0.150 – 0.400 |
| M20 / 3/4" | 2.5 / 10 | 40 – 200 / 1.5" – 8" | 0.300 – 0.800 |
| M24 / 1" | 3.0 / 8 | 50 – 250 / 2" – 10" | 0.500 – 1.50 |
Common Types Of Fasteners
Bolts
Nuts
Steel Screw
Washer
Stud Bolts
Frequently Asked Questions (FAQ)
What is Stainless Steel 309 Fastener?
Stainless Steel 309 Fasteners are high-temperature and corrosion-resistant fasteners made from SS 309 grade. They are commonly used in industrial applications requiring durability under extreme conditions.
Where are SS 309 Fasteners used?
SS 309 Fasteners are used in high-temperature environments such as furnaces, kilns, heat exchangers, petrochemical plants, and chemical processing equipment.
What types of SS 309 Fasteners are available?
Common types include bolts, nuts, screws, studs, and washers, available in different sizes and thread types.
What are the key features of SS 309 Fasteners?
They offer excellent corrosion resistance, high-temperature strength, durability, and reliability for industrial applications.
What standards do SS 309 Fasteners comply with?
They typically comply with ASTM A193 / A194, ASME B18.2.1 / B18.2.2, and other international standards depending on the type of fastener.
Pipes & Tubes Supplier
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