Stainless Steel 416 has a density of approximately 7.75 g/cm³ (0.280 lb/in³) and is composed of 12.00–14.00% chromium, 1.00% maximum silicon, 1.25% maximum manganese, 0.15% maximum carbon, and 0.15% minimum sulfur, with the balance consisting of iron. It is a tough, heat-treatable martensitic stainless steel known for its excellent machinability, strength, hardness, and wear resistance. The intentional sulfur addition improves chip formation and machining performance, making Type 416 one of the easiest stainless steel grades to machine. This combination of machinability and mechanical performance makes Stainless Steel 416 an excellent choice for shafts, fasteners, valve components, fittings, gears, wire forms, and other precision-machined industrial applications.
416 stainless steel wire is identified under multiple naming conventions, including grade, alloy, and UNS designations; depending on the specification, industry, or standard being used.
Stainless steel 416 alloys are known by several names depending on the standard, specification, or drawing being used. Understanding these alternate names matters because the same alloy can appear under different designation systems across quotes, certifications, standards, and legacy prints. For buyers and engineers working with wire, this is especially important, since Stainless Steel 416 may be referenced through material standards tied to specific product forms and applications rather than by one simple trade name alone.
Type 416 is the traditional “Type” grade designation used throughout stainless steel specifications and industry practice and appears in technical descriptions, engineering standards, and material references for Stainless Steel 416. Best for technical sales sheets, alloy descriptions, engineering drawings, and legacy documents where stainless steel grades are identified using the traditional Type system. Many engineers, buyers, and metallurgists still reference stainless grades in “Type” terminology, making this designation familiar, easy to recognize, and well aligned with longstanding industry documentation.
AISI 416 is the designation derived from the American Iron and Steel Institute (AISI) stainless steel grade classification system. Best for engineering discussions, procurement cross-references, technical specifications, and older North American documents that continue to use AISI terminology. The use of AISI 416 immediately identifies the material as the widely recognized free-machining martensitic stainless steel grade rather than simply a commercial trade name, making it useful for technical communication, material selection, and specification review across a wide range of industries.
UNS S41600 is the official Unified Numbering System (UNS) designation for Stainless Steel 416. Best for formal material identification, cross-referencing between industry standards, quality assurance documentation, mill certifications, engineering specifications, and multi-standard procurement requirements. This designation serves as the clearest and most unambiguous identifier when matching Stainless Steel 416 across different specification systems and international standards. It is especially useful when a drawing, certification, purchase order, or compliance document requires a formal material designation rather than a commercial or trade-style name.
Grade 416 is a generic technical descriptor commonly used in datasheets, engineering references, technical articles, and educational materials for the alloy. Best for technical overviews, material comparisons, specification discussions, and informational content. It reads naturally in explanatory writing and is particularly useful when comparing stainless steel grades, such as Grade 416 vs. Grade 410 or Grade 416 vs. Grade 420. Because it uses straightforward technical language rather than a specific standards designation, Grade 416 is widely understood by engineers, buyers, students, and industry professionals across a broad range of machining and industrial applications.
Free Machining Stainless Steel is a common technical description for Stainless Steel 416 because it was specifically developed to provide superior machinability compared to other martensitic stainless steel grades. Best for precision-machined components, shafts, fasteners, fittings, valve parts, and high-volume manufacturing applications. This designation highlights the alloy’s sulfur-enhanced chemistry, which improves chip formation and machining performance while maintaining the strength, hardness, and heat-treatable properties associated with martensitic stainless steels.
Free-Cutting Stainless Steel is a common technical description for Stainless Steel 416 because of its enhanced machinability and chip-breaking characteristics during machining operations. Best for precision-machined parts, fittings, valve components, shafts, fasteners, and high-volume production applications. This designation highlights the alloy’s sulfur-modified chemistry, which improves cutting performance and manufacturing efficiency while maintaining the strength, hardness, and heat-treatable properties of a martensitic stainless steel.
Sulfur-Modified Stainless Steel is a common technical description for Stainless Steel 416 because sulfur is intentionally added to improve machinability and chip control during machining operations. Best for precision-machined components, fittings, valve parts, shafts, fasteners, and high-volume manufacturing applications. This designation highlights the alloy’s enhanced machining performance, allowing faster production rates and improved tool life while maintaining the strength, hardness, and heat-treatable characteristics of a martensitic stainless steel.
Machinable Martensitic Stainless Steel is a common technical description for Stainless Steel 416 because it combines the heat-treatable strength and hardness of martensitic stainless steels with enhanced machinability. Best for precision-machined components, shafts, valve parts, fittings, fasteners, and other applications requiring efficient manufacturing and reliable mechanical performance. This designation highlights the alloy’s sulfur-enhanced chemistry, which improves cutting characteristics while preserving the strength, wear resistance, and heat-treatable properties that make Stainless Steel 416 a popular choice for machining-intensive applications.
13Cr Free Machining Stainless Steel is a chemistry-based designation commonly used to describe Stainless Steel 416 based on its approximate 13% chromium content and enhanced machinability. Best for precision-machined components, fittings, valve parts, shafts, fasteners, and industrial manufacturing applications. This designation highlights the alloy’s sulfur-modified chemistry, which improves chip control and machining performance while maintaining the strength, hardness, corrosion resistance, and heat-treatable properties characteristic of martensitic stainless steels.
13% Chromium Stainless Steel is a chemistry-based designation commonly used to describe Stainless Steel 416 based on its approximate 13% chromium content. Best for educational content, alloy comparisons, and technical discussions focused on stainless steel chemistry. This designation highlights the chromium addition that provides Stainless Steel 416 with its corrosion resistance while supporting the martensitic structure that enables enhanced strength, hardness, wear resistance, and excellent machinability.
ASTM 416 is a common reference to Stainless Steel 416 when specified under ASTM material standards. Best for engineering specifications, procurement documents, quality requirements, and manufacturing applications that follow ASTM standards. The designation ASTM 416 helps identify the alloy within ASTM-controlled specifications and is frequently used in technical documentation, certifications, and material purchasing requirements, particularly where superior machinability, heat-treatable properties, and reliable mechanical performance are important.
Chromium Martensitic Stainless Steel is a broad technical description used to classify Stainless Steel 416 based on its chromium content and martensitic crystal structure. Best for educational content, metallurgy discussions, and technical overviews of stainless steel families. This designation highlights the alloy’s chromium-based corrosion resistance and its ability to be heat treated for increased strength, hardness, and wear resistance, while also emphasizing the enhanced machinability that distinguishes Stainless Steel 416 from many other martensitic stainless steel grades.
Heat Treatable Stainless Steel is a common technical description for Stainless Steel 416 because it can be hardened and strengthened through heat treatment. Best for precision-machined components, shafts, valve parts, fasteners, fittings, and industrial equipment requiring enhanced mechanical performance. This designation highlights one of the alloy’s most valuable characteristics: the ability to achieve higher hardness, strength, and wear resistance through heat treatment while maintaining the excellent machinability that makes Stainless Steel 416 a preferred choice for machining-intensive applications.
High Machinability Stainless Steel is a common technical description for Stainless Steel 416 because it offers some of the best machining characteristics among stainless steel grades. Best for precision-machined components, fittings, shafts, valve parts, fasteners, and high-volume manufacturing operations. This designation highlights the alloy’s sulfur-enhanced chemistry, which improves chip control, cutting performance, and production efficiency while maintaining the strength, hardness, and heat-treatable properties of a martensitic stainless steel.
Stainless steel wire alloys are used in various industries, including:
Sunset Wire can manufacture custom diameters of SS416 for your project. Common sizes of Type 416 include:
Sunset Wire stocks a large inventory of stainless steel wire to ensure you get it fast. Get your wire in 1 lb cans, 1 lb spools or 5 lb spools. Other spool sizes are available upon request.
Why Choose Sunset Wire?
Sunset Wire provides domestically drawn wire in various diameters, lengths and packages. Get your stainless steel wire delivered anywhere in the US thanks to our large inventory and dedicated supply chain management capabilities.