Leading Supplier, Stockist and Exporter of Fastners Nuts & Bolts Washers
BB Infras is a leading global supplier, stockist and exporter of industrial fasteners — including hex bolts, studs, machine screws, nuts, spring & flat washers, structural bolts and specialty fasteners. We serve OEMs, EPC contractors, fabricators and distributors across oil & gas, power, petrochemical, infrastructure, marine, and heavy engineering sectors. Our inventory spans metric (ISO/DIN) and imperial (ASME/ASTM) ranges in multiple materials and finishes.
Our fasteners are available in a broad selection of materials: low-carbon steel, medium/high tensile alloy steel (grades 8.8, 10.9, 12.9), stainless steels (A2-304, A4-316/316L), duplex and super-duplex stainless steels, nickel alloys (Inconel®), Monel®, titanium, copper alloys (brass/bronze), and engineered polymers. We also offer coated & plated finishes — hot-dip galvanizing, electro-galvanize, zinc-nickel, black oxide, cadmium replacement coatings and PTFE/fluropolymer coatings for corrosion resistance and lubrication.
Quality and traceability are core to BB Infras. Fasteners are sourced from certified manufacturers and supplied with material test certificates (MTC / EN 10204 3.1), mechanical test reports, heat numbers and, where required, third-party inspection. Many of our high-performance fasteners are manufactured and tested according to ASTM, ASME, ISO, DIN and BS standards to ensure correct mechanical and metallurgical performance in demanding service conditions.
Our technical team helps select the correct grade, heat treatment and surface finish based on design load, temperature, corrosive environment and cyclic loading. For high-temperature, high-pressure or corrosive environments we recommend alloyed or nickel-base fasteners (e.g., Inconel 625/718), duplex/super-duplex grades or titanium. For general structural and machinery use, medium- and high-tensile carbon/alloy grades are commonly specified.
BB Infras maintains large stock across standard sizes (M3 to M64 / 1/8" to 2-1/2") and custom-length studs, special-headed bolts, flange bolts, structural nuts (HSFG), prevailing torque nuts, lock-nuts and matched washer sets. We also supply precision machine screws, self-tapping screws and fastener kits for maintenance, turnaround and construction packages.
Specifications
| Item | Typical Specifications / Standards |
|---|---|
| Bolts & Screws | ISO 898-1, DIN 931/933, ASTM A325 / A490 (structural), ASTM F593 / F3125 (stainless), ASME B18.2.1 |
| Nuts | ISO 4032 / 4033, DIN 934, ASTM A563 (steel), ASTM F594 (stainless) |
| Washers | ISO 7089 (flat), ISO 8752 (spring), DIN 125/127, ASTM F436 (hardened) |
| Studs | ASME B18.2.1, ASTM A193 / A320 (alloy/stainless) |
| Strength Classes | 4.6, 8.8, 10.9, 12.9 (metric) — Grade 2, Grade 5, Grade 8 (imperial) |
| Finish / Coatings | Electro-zinc, Hot-dip Galvanized, Zinc-Nickel, Black Oxide, Phosphate, PTFE, Nickel/Chrome Plating |
Chemical Composition (Representative / Typical)
Values are representative ranges used for selection guidance; refer to supplier MTC or standard for exact limits.
| Material | Key Elements (typical) |
|---|---|
| Carbon Steel (Grade 8.8 typical) | C ≈ 0.25–0.35%, Mn 0.4–1.2%, P & S trace |
| Alloy Steel (Grade 10.9 / 12.9) | C ≈ 0.30–0.45%, Cr 0.2–1.0%, Mo 0.1–0.5%, V/Nb traces |
| Stainless Steel A2-304 | Cr 18–20%, Ni 8–10.5%, C ≤0.08% |
| Stainless Steel A4-316 | Cr 16–18%, Ni 10–14%, Mo 2–3% |
| Titanium (Grade 2) | Ti balance, O ≈ 0.2%, Fe ≈ 0.3% (low alloy) |
| Inconel 625 | Ni balance (~58%+), Cr 20–23%, Mo & Nb alloying |
| Brass | Cu 60–70%, Zn rest (varies by alloy) |
Mechanical Properties (Typical)
| Material / Class | Tensile Strength (MPa) | Yield (MPa) | Hardness / Notes |
|---|---|---|---|
| Grade 4.6 | ≈ 400 | ≈ 240 | Lower strength, ductile |
| Grade 8.8 | ≈ 800 | ≈ 640 | Common high-strength structural |
| Grade 10.9 | ≈ 1000 | ≈ 900 | Higher strength; heat-treated |
| Grade 12.9 | ≈ 1200 | ≈ 1100 | Very high strength; used for critical joints |
| Stainless Steel 304/316 | ≈ 500–700 | ≈ 205–310 | Corrosion resistant; not as high tensile as alloy bolts |
| Titanium Grade 2 | ≈ 340–480 | ≈ 275 | Excellent strength-to-weight & corrosion resistance |
Equivalent Grades (Quick Reference)
| Common | Metric / Imperial / Standards |
|---|---|
| Metric 8.8 | ISO 898-1 Class 8.8 ≈ Imperial Grade 5 (approx) |
| Metric 10.9 | ISO 898-1 Class 10.9 ≈ High tensile alloy fasteners |
| Stainless A2-70 | ISO 3506-A2 / ASTM F593 (approx stainless bolt spec) |
| Stainless A4-80 | ISO 3506-A4 / ASTM F594 (nuts & bolts stainless marine grade) |
| Titanium | ASTM F467 / ISO 5832 equivalents for surgical/industrial grades |
| Inconel / Monel | ASTM/ASME UNS N06625 / N04400 equivalents |
Dimension Chart — Typical Metric Fasteners (Selected)
Representative metric sizes — lengths and head styles vary by standard (ISO/DIN/ASME). Use engineering drawings / standards for precise tolerances.
| Thread (metric) | Nominal Diameter (mm) | Hex Head Width Across Flats (mm) | Recommended Washer (outer dia mm) |
|---|---|---|---|
| M6 × 1.0 | 6 | 10 | 12 |
| M8 × 1.25 | 8 | 13 | 16 |
| M10 × 1.5 | 10 | 17 | 20 |
| M12 × 1.75 | 12 | 19 | 24 |
| M16 × 2.0 | 16 | 24 | 30 |
| M20 × 2.5 | 20 | 30 | 36 |
| M24 × 3.0 | 24 | 36 | 43 |
We support bulk project deliveries, vendor-managed inventory (VMI), kitting and customized packaging for export compliance. Our global forwarding and export experience ensures secure packing, correct documentation and timely deliveries to project sites worldwide.
Uses of Fastners Nuts & Bolts Washers
Fastners Nuts & Bolts Washers are essential components used in piping systems to ensure safe, leak-free, and efficient fluid or gas transfer across various industries. They connect, control, regulate, and support pipelines operating under different temperature and pressure conditions.
1. Oil & Gas Industry
Fastners Nuts & Bolts Washers are widely used in onshore and offshore drilling operations, refinery pipeline systems, gas distribution networks, and high-pressure fluid transfer. Their corrosion resistance and temperature tolerance make them ideal for harsh environments.
2. Petrochemical & Chemical Industry
These fittings are crucial in chemical processing plants, acid/alkali lines, solvent transfer systems, and hazardous chemical handling. Materials are selected based on corrosion resistance and compatibility with chemicals.
3. Power Generation Industry
Fastners Nuts & Bolts Washers are used in boiler lines, steam pipelines, turbine systems, and cooling water networks. They withstand high pressure and extreme temperatures in thermal, nuclear, and renewable energy plants.
4. Water Treatment & Desalination Plants
Applications include RO systems, filtration units, pumping stations, and municipal water supply lines. Fittings provide durability, corrosion resistance, and long-term leak-proof performance.
5. Food & Beverage Industry
Stainless steel sanitary fittings ensure hygienic flow in dairy units, breweries, beverage manufacturing, and food processing systems. They prevent contamination and meet high hygiene standards.
6. Pharmaceutical Industry
Fastners Nuts & Bolts Washers are used in cleanroom piping, purified water systems, drug manufacturing units, and sterile processing operations. They comply with GMP and maintain contamination-free fluid handling.
7. Construction & Infrastructure
Used in firefighting systems, HVAC networks, plumbing systems, and building pipelines. Fastners Nuts & Bolts Washers ensure reliable flow and structural stability across large infrastructure projects.
8. Marine & Shipbuilding
Marine-grade fittings are used in seawater pipelines, ballast systems, and fuel/oil transfer lines. They offer high resistance to corrosion in saltwater environments.
9. Automotive & Aerospace
Essential for fuel injection lines, hydraulic systems, coolant pipelines, and high-pressure circuits. They withstand vibration, heat, and pressure fluctuations in vehicles and aircraft.
10. Mining & Metal Processing
Fastners Nuts & Bolts Washers are used in slurry pipelines, ore processing systems, and high-abrasion environments. Alloy steel fittings provide strength, wear resistance, and durability.
FAQ — Frequently Asked Questions
- Q: What fastener materials do you supply?
- A: BB Infras supplies carbon & alloy steels, stainless steels (A2/A4), duplex & super-duplex, Inconel, Monel, titanium, brass, bronze and specialty polymer fasteners.
- Q: What strength classes are available?
- A: Common metric classes: 4.6, 8.8, 10.9, 12.9. Imperial equivalents: Grade 2, Grade 5, Grade 8. We also supply ASTM/ASME specified fasteners for structural and pressure-critical applications.
- Q: Do you provide certification and test reports?
- A: Yes — MTC (EN 10204 3.1 / 3.2), hardness & mechanical test reports, PMI for exotic alloys and third-party inspection are available on request.
- Q: Can you supply pre-assembled bolt & nut sets with washers?
- A: Yes — we provide kitting, matched torque-controlled assemblies, HSFG structural bolt sets, and custom packaging for site-ready installation.
- Q: What coatings are offered to improve corrosion resistance?
- A: Common finishes include hot-dip galvanizing, electro/zinc plating, zinc-nickel, black oxide, phosphate, PTFE coating and specialized anti-galling coatings for stainless fasteners.
- Q: Do you manufacture custom or special fasteners?
- A: Yes. BB Infras manufactures custom-length studs, special-headed bolts, machined fasteners, and exotic alloy fasteners per drawing or specification.
- Q: How should I specify fasteners when requesting a quote?
- A: Provide: fastener type, thread (e.g., M20 × 2.5 or 3/4"-10), length, material/grade, strength class, finish/coating, quantity and any special tests or certifications required.
Countries we have exported our products to
Turkey, Thailand, Bulgaria, Serbia, Mexico, Estonia, Trinidad & Tobago,Tunisia, New Zealand, Indonesia, Puerto Rico, Ireland, India, Morocco, Brazil, Lebanon, Hong Kong, Jordan, Ukraine, Switzerland, Czech Republic, Lithuania, Sri Lanka, Greece, Taiwan, Zimbabwe, Algeria, Romania, Mexico, Ghana, Italy, Philippines, Spain, United Kingdom, Finland, Azerbaijan, Japan, Macau, Israel, Saudi Arabia, Kenya, Bhutan, Poland, Poland, Costa Rica, Kuwait, Singapore, Pakistan, France, Colombia, Tibet, Bolivia, Portugal, Iraq, Australia, Kazakhstan, Nepal, Mongolia, Gambia, Malaysia, Chile, Germany, Slovakia, China, Bahrain, Denmark, Angola, Afghanistan, Peru, Austria, Ecuador, Gabon, Croatia, South Africa, Sweden, Chile, Hungary, United Arab Emirates, Argentina, Bangladesh, Oman, Egypt, United States, Belgium, Canada, Namibia, Norway, Qatar, Belarus, Netherlands.
Cities we have supplied our products to
Bengaluru, Vung Tau, Nashik, Jaipur, Navi Mumbai, La Victoria, Al Jubail, Noida, Granada, Doha, Dammam, Ernakulam, Chandigarh, Santiago, Melbourne, Surat, Nagpur, Ranchi, Kanpur, Jakarta, Ahvaz, Indore, Jamshedpur, Muscat, Rajkot, Lahore, Chiyoda, Milan, Hong Kong, Riyadh, Houston, Busan, Calgary, Madrid, Visakhapatnam, Atyrau, Bhopal, Algiers, Colombo, Kolkata, Petaling Jaya, Dallas, London, Cairo, Thiruvananthapuram, Caracas, Howrah, Moscow, Port-of-Spain, Baroda, Mexico City, Gurgaon, Singapore, Aberdeen, Coimbatore, Kuala Lumpur, Perth, Ahmedabad, New York, New Delhi, Manama, Abu Dhabi, Montreal, Jeddah, Pune, Vadodara, Kuwait City, Chennai, Geoje-si, Tehran, Mumbai, Hanoi, Karachi, Pimpri-Chinchwad, Thane, Haryana, Ulsan, Seoul, Dubai, Ho Chi Minh City, Toronto, Hyderabad, Los Angeles, Faridabad, Lagos, Sydney, Courbevoie, Bangkok, Bogota, Rio de Janeiro, Ankara, Al Khobar, Ludhiana, Istanbul, Gimhae-si, Brisbane, Edmonton, Sharjah, Secunderabad.
