Certified Quality & Precision Manufacturing
Neelkamal Alloys LLP produces high-grade Alloy 20 (UNS N08020 / Carpenter 20) fasteners tailored for extreme acid service. Every order is delivered with 100% material heat traceability, PMI testing reports, and EN 10204 3.1 Mill Test Certification.
High-Performance Alloy 20 Fasteners (UNS N08020 / Carpenter 20)
Neelkamal Alloys LLP is a premier manufacturer, stockist, and international exporter of Alloy 20 fasteners based in Mumbai, India. Designed specifically to resist severe chemical attack, Alloy 20 (commonly known as Carpenter 20 or WERKSTOFF NR. 2.4660) is an austenitic iron-nickel-chromium alloy enriched with copper and molybdenum.
Our complete range of Alloy 20 nuts, hex bolts, stud bolts, threaded rods, machine screws, and washers is engineered for superior performance in environments containing sulfuric acid, chlorides, and nitric-phosphoric acid mixtures. Where standard 304 or 316 grade stainless steels fail due to pitting or stress corrosion cracking, our ASTM B473 Alloy 20 fasteners provide extended component life and leak-proof joint integrity.
Alloy 20 Fastener Specifications & Technical Standards
We supply standard and custom-drawn Alloy 20 fasteners matching rigorous international dimension and tolerance specifications for oil & gas, chemical processing, marine, and pharmaceutical industries.
| Material Specification | ASTM B473, ASTM B462, ASME SB473 / UNS N08020 / Carpenter 20 / 2.4660 |
|---|---|
| Dimensional Standards | ASME B18.2.1, ASME B18.2.2, ASME B18.3, DIN 931, DIN 933, DIN 934, DIN 975, ISO 4032, ISO 4017 |
| Diameter Range | Metric: M2 to M160 | Imperial: 1/4" to 4" (Custom sizes up to M100 for CNC turned parts) |
| Thread Forms | UNC, UNF, UNEF, BSW, Metric Coarse & Fine Threads (Class 2A/2B, 6g/6H) |
| Fastener Types | Hex Head Bolts, Heavy Hex Bolts, Stud Bolts, Hex Thin Nuts, Lock Nuts, Flat Washers, Socket Cap Screws, U-Bolts |
| Surface Coatings | Self-Colour, Bright Zinc Plated (BZP), PTFE / Teflon Coated, Xylan Coated, Hot-Dip Galvanized (HDG), Passivated |
| Testing & Quality | PMI Chemical Analysis, Tensile Strength Test, Hardness Test, Microstructure Check, EN 10204 3.1 MTC |
Chemical Composition & Mechanical Properties
The addition of 32–38% Nickel, 19–21% Chromium, and 3–4% Copper grants Alloy 20 unique resistance to intergranular corrosion and sulfuric acid solutions across varied concentrations and temperatures.
Chemical Composition of Alloy 20 (UNS N08020)
| Grade | Ni (Nickel) | Cr (Chromium) | Fe (Iron) | Cu (Copper) | Mo (Molybdenum) | Mn (Manganese) | Si (Silicon) | C (Carbon) |
|---|---|---|---|---|---|---|---|---|
| Alloy 20 | 32.0 – 38.0% | 19.0 – 21.0% | Balance | 3.0 – 4.0% | 2.0 – 3.0% | 2.0% max | 1.0% max | 0.07% max |
Mechanical Properties
| Density | Melting Point | Tensile Strength (Min) | Yield Strength 0.2% (Min) | Elongation (Min) | Hardness (Max) |
|---|---|---|---|---|---|
| 8.05 g/cm³ | 1443 °C (2630 °F) | 80 ksi / 551 MPa | 35 ksi / 241 MPa | 30 % | 217 HBW / 95 HRB |
Alloy 20 Nuts, Bolts, Studs & Washers Product Range
Our manufacturing setup encompasses cold forging, hot forging, and high-precision CNC machining to deliver fast turnarounds on standard or drawing-based orders.
| Product Category | Available Types | Standard Dimensions |
|---|---|---|
| Alloy 20 Bolts | Hex Head Bolts, Heavy Hex Bolts, Flange Bolts, Carriage Bolts, Eye Bolts, U-Bolts, Foundation Anchor Bolts | ASME B18.2.1, DIN 931 / DIN 933 |
| Alloy 20 Stud Bolts | Full-Thread Stud Bolts, Double-End Studs, Tap-End Studs, Threaded Rods | ASME B16.5 / ASME B18.31.2, DIN 975 |
| Alloy 20 Nuts | Hex Nuts, Heavy Hex Nuts, Thin Jam Nuts, Nylock Nuts, Flange Nuts, Coupling Nuts | ASME B18.2.2, DIN 934, ISO 4032 |
| Alloy 20 Screws | Socket Head Cap Screws, Countersunk Socket Screws, Button Head Screws, Machine Screws, Set Screws | ASME B18.3, DIN 912, ISO 4762 |
| Alloy 20 Washers | Flat Washers, Spring Lock Washers, Heavy Duty Structural Washers, Sealing Washers | ASME B18.21.1, DIN 125 / DIN 127 |
Estimated Pricing Guide for Alloy 20 Fasteners
Prices vary based on bolt length, diameter, raw material market fluctuations, and specific coating specifications. Below is an estimated global B2B price reference:
| Item Description | Size / Standard | Estimated Price (USD) |
|---|---|---|
| Alloy 20 Hex Head Bolt & Nut Assembly | M8 to M20 / ISO 4017 | $0.50 - $4.50 / Piece |
| Alloy 20 Heavy Hex Stud Bolt c/w 2 Heavy Nuts | 1/2" to 1-1/2" / ASME B16.5 | $3.20 - $18.00 / Set |
| Alloy 20 Threaded Rod (1 Meter Length) | M10 to M30 / DIN 975 | $12.50 - $45.00 / Piece |
| Alloy 20 Plain Flat Washers | M6 to M24 / DIN 125 | $0.15 - $1.80 / Piece |
Require Technical Quotes or Custom Alloy 20 Fasteners?
Our engineering experts provide prompt price estimates, material verification, and worldwide freight scheduling for EPC contracts and industrial plants.
Inquire NowWorldwide Export & Quality Assurance
At Neelkamal Alloys LLP, every shipment undergoes comprehensive dimensional gauge checks, thread fit testing, and Positive Material Identification (PMI). We package all export items in heavy-duty wooden crates or sea-worthy pallets with anti-corrosion wrapping to guarantee pristine condition upon arrival.
Key Supply Regions
Middle East (UAE, Saudi Arabia, Qatar, Oman, Kuwait), Europe (UK, Germany, France, Netherlands, Italy, Spain), North America (USA, Canada), Southeast Asia (Singapore, Malaysia, Indonesia, Thailand).
Third-Party Inspection
We regularly host third-party inspection agencies such as TUV, Bureau Veritas (BV), SGS, DNV, and Lloyd's Register to review quality plans prior to dispatch.
Frequently Asked Questions (FAQ)
Why are Alloy 20 fasteners specified over standard 316 stainless steel?
Alloy 20 (UNS N08020) contains 32-38% nickel, 19-21% chromium, and 3-4% copper, providing exceptional resistance to sulfuric acid attack, chloride pitting, and stress corrosion cracking where standard 316 or 316L stainless steels rapidly degrade.
Which manufacturing standards do your Alloy 20 fasteners conform to?
Our Alloy 20 bolts, nuts, and studs are manufactured in strict compliance with ASTM B473, ASTM B462, ASME SB473, ASME B18.2.1, ASME B18.2.2, DIN 931, DIN 933, DIN 934, and ISO 4032 standards.
Are Mill Test Certificates (MTC) provided with export shipments?
Yes, every batch of Alloy 20 fasteners dispatched by Neelkamal Alloys LLP includes EN 10204 3.1 Mill Test Certificates detailing exact heat numbers, chemical composition, mechanical test values, and PMI verification.
Can Neelkamal Alloys LLP supply PTFE or Teflon coated Alloy 20 stud bolts?
Yes, we offer custom surface finishes including Blue Xylan, PTFE Teflon coating, Cadmium plating, and Zinc-Nickel plating for offshore and marine subsea flange bolting applications.