Njabulo Stainless, based in Cape Town, South Africa, is a trusted manufacturer and supplier of Stainless Steel 440C Fasteners. This high-carbon martensitic stainless steel is used to make bolts, nuts, studs, and washers that provide exceptional hardness, wear resistance, and mechanical strength. Njabulo Stainless ensures precision threading, smooth surfaces, and uniform dimensions, offering secure, reliable, and long-lasting connections. 440C fasteners are widely used in automotive, aerospace, industrial machinery, tooling, and heavy equipment industries, where durability, strength, and resistance to wear are essential for safe and efficient operation.
Stainless Steel 440C Fasteners are made from martensitic stainless steel 440C, containing high carbon (0.95–1.20%) and chromium (16–18%). This composition provides excellent hardness, tensile strength, wear resistance, and moderate corrosion resistance. Mechanically, 440C fasteners offer high fatigue strength, toughness, and dimensional stability, making them ideal for high-load, high-stress, and vibration-prone applications. Precision manufacturing ensures smooth threads and consistent dimensions, allowing for tight and secure fastening. These properties make 440C fasteners suitable for critical assemblies requiring reliable performance, durability, and resistance to mechanical wear.
Specification : ASTM A193 / ASME SA193
Dimensions : ASME B18.2.1, ASME B18.3, DIN 931, DIN 933, DIN 934, DIN 7991, DIN 976
Standard : DIN, GB, BS, ISO, IS, JIS, ASTM, ASME, EN, etc.
Size : M02 to M33
Length : 3 mm to 200 mm
Threads : ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads
Types : Nuts, Bolts, Screws, Sockets, Studs, Screw, Hex Set Screw, Socket Screw, Cap Screw, Pan Head Screw, Machine Screw, Socket Head Cap Screw, Allen Cap screw, Wing Screw, Washers, Spring Washers, Studs, Anchors, Marine Anchors, Nut, Hexagon Nut, Hex Nut, Hex Coupling Nut, Hex Domed Cap Nuts, Square Nut, Stud Bolts, Hex Head Bolts, Socket Hexagon Head Screw Anchor Bolt, U- Bolts, J Bolts, Mushroom Head Square Neck Bolts, T-Head Bolts, Wing Screw, Eye Bolt, Foundation Bolts, Structural Bolts.
| Grade | C | Mn | Si | P | S | Cr | |
| 440C | min. | 0.95 – 1.20 | – | – | – | – | 16.0 |
| max. | 0.12 | 1.0 | 1.00 | 0.04 | 0.030 | 18.0 | |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 440C | 758 | 448 | 14 | 95 | – |
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These nuts offer high corrosion resistance and excellent strength due to the high carbon content in 440c stainless steel. They are available in sizes ranging from M3 to M48 and meet various industrial standards for dimensions and tolerances.
440c Stud Bolts provide exceptional corrosion resistance and high tensile strength. They come in diameters from M6 to M30 and lengths from 50mm to 1000mm, suitable for demanding applications requiring precision and durability.
440c Bolts are ideal for harsh environments and offer superior corrosion resistance and high strength. They are available sizes from M5 to M36, with varying lengths and thread specifications to meet diverse application needs.
These threaded rods are known for their excellent corrosion resistance and high tensile strength. They are typically available in diameters from M6 to M30 and lengths up to 3000mm, suitable for use in various industrial settings.
440c screws provide robust corrosion resistance and high strength. Commonly available in sizes from M3 to M20, lengths varying based on application needs, they are ideal for precision and heavy-duty fastening tasks.
440C washers offer outstanding corrosion resistance and durability, making them ideal for distributing loads and protecting surfaces. They are available in sizes from M3 to M36 and come in various thicknesses to meet specific application needs. Their robust properties ensure reliable performance in demanding environments.
At Njabulo Stainless we ensure that our Stainless Steel 440C Fasteners undergo rigorous quality tests, including Hardness Test, PMI Testing, Chemical Analysis, and IGC Test, to guarantee excellence. We provide detailed documentation such as invoices with HS codes, packaging lists, Certificates of Origin, and Guarantee Letters. Additionally, Third-Party Inspection Certificates ensure complete client satisfaction and reliability.
Stainless Steel 440C Fasteners are widely used in automotive, aerospace, tooling, industrial machinery, and heavy equipment industries. They are ideal for fastening bolts, nuts, studs, and washers in high-stress, high-load, or wear-prone environments. Their hardness and wear resistance make them suitable for precision machinery, valves, pumps, gears, shafts, and cutting tools. In industrial and construction applications, 440C fasteners provide durable, secure, and long-lasting connections. Overall, they deliver safe, reliable, and high-performance fastening in demanding environments where mechanical strength, wear resistance, and moderate corrosion resistance are essential.
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