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Industrial Fasteners Manufacturer

Industrial Fasteners Manufacturer, Exporter & Global Supplier in India

High-Tensile Stud Bolts, Hex Bolts, Heavy Hex Nuts & Washers | ASTM A193, ASTM A194 & Nickel Alloys

Core Flow Flange is a premier manufacturer, stockist, and exporter of high-integrity industrial fasteners engineered for critical pressure, elevated temperature, and severe corrosive environments. We manufacture an extensive range of standard and bespoke bolting products—including continuous threaded stud bolts, heavy hex bolts, socket head cap screws, industrial nuts, and engineered washers—strictly conforming to international standards such as ASME, ASTM, DIN, ISO, and BS.

Equipped with precision cold-forming, hot-forging, and CNC threading facilities, our fasteners ensure precise thread engagement, superior tensile strength, and dependable clamp load retention across oil & gas, petrochemical, power generation, and heavy structural applications.

Technical Specifications & Fastener Types

Category
Available Forms & Configurations
Bolts & Studs
Continuous Thread Stud Bolts, Double-End Studs, Heavy Hex Head Bolts, Socket Head Cap Screws, Anchor & Foundation Bolts, U-Bolts, J-Bolts, T-Head Bolts, Eye Bolts, Structural Heavy Hex Bolts
Industrial Nuts
Jam / Thin Nuts, Coupling Nuts, Castle Nuts, Nylon Insert Lock Nuts, All-Metal Self-Locking Nuts, Domed Cap Nuts, Square NutsHeavy Hex Nuts, Standard Hex Nuts, Hex
Engineered Washers
Flat / Plain Washers (Standard, Large OD, Narrow OD), Spring Lock Washers, Heavy-Duty Belleville Washers, External/Internal Tooth Washers, Star Washers, Single & Double Tab Washers
Machine & Socket Screws
Allen Socket Head Cap Screws, Countersunk (CSK) Allen Screws, Socket Shoulder Screws, Low-Head Cap Screws, Socket Set Screws (Cup, Flat, Cone, Dog Point), Pan & Cheese Head Machine Screws
Thread Profiles
UNC, UNF, Metric Coarse, Metric Fine, BSW, 8-UN series (per ASME B1.1 / ISO 261)

Material Specifications & Grade Matrix

1. High-Tensile Carbon Steel & Low-Alloy Bolting

Engineered for high-pressure, elevated-temperature, and low-temperature pressure vessel and piping service:

  • High-Temp Bolting (ASTM A193): Grade B7, B7M, B16
  • Matching Nuts (ASTM A194): Grade 2H, 2HM, Grade 7, 7M
  • Low-Temp Service (ASTM A320): Grade L7, L7M
  • Metric Property Classes: 4.6, 5.6, 8.8, 10.9, 12.9

2. Stainless Steel Fasteners

Manufactured for high corrosion resistance and cryogenic-to-elevated temperature service:

  • ASTM A193 (Bolting): Grade B8 (SS 304), B8M (SS 316), B8C (SS 347), B8T (SS 321), Class 1 & Class 2 (Strain Hardened)
  • ASTM A194 (Nuts): Grade 8, 8M, 8C, 8T, Grade 6 (SS 410)
  • Commercial & Marine Grades: AISI 304, 304L, 316, 316L, 310S, 410, 420; ISO 3506-1 A2-70, A2-80, A4-70, A4-80

3. High-Nickel & Exotic Alloy Fasteners

Designed for severe chemical processing, sour gas (NACE MR0175), marine, and high-heat environments:

  • Monel (Nickel-Copper): ASTM B164 UNS N04400 (Monel 400), UNS N05500 (Monel K500)
  • Inconel (Nickel-Chromium): ASTM B166 UNS N06600 (Alloy 600), UNS N06601 (Alloy 601); ASTM B446 UNS N06625 (Alloy 625)
  • Incoloy: ASTM B425 UNS N08825 (Alloy 825), UNS N08800 (Alloy 800)
  • Hastelloy: ASTM B574 UNS N10276 (Hastelloy C-276), UNS N06022 (Alloy C-22)
  • Specialty Alloys: ASTM B472 UNS N08020 (Alloy 20), Pure Nickel UNS N02200 / N02201

Protective Surface Treatments & Coatings

To withstand aggressive atmospheric, offshore, and chemical conditions, we provide certified anti-corrosion surface finishes:

  • Plain/Bare Metal (Rust-Preventive Oiled)
  • Hot-Dip Galvanizing (ASTM A153)
  • Mechanical Galvanizing & Zinc Electroplating (Blue, Yellow, Clear Passivation)
  • Cadmium Plating & Zinc-Nickel Plating
  • PTFE / Xylan / Fluoropolymer Coatings (for offshore low friction & chemical resistance)
  • Phosphate Coating (Manganese / Zinc Phosphate)

Quality Assurance & Material Certification

Every production lot undergoes rigorous mechanical, dimensional, and non-destructive evaluations before dispatch:

  • Dimensional Inspection: Go/No-Go thread gauging, pitch micrometer analysis, optical comparator testing
  • Mechanical Testing: Tensile strength, proof load, yield strength, elongation, and Rockwell/Brinell hardness testing
  • Documentation: Complete Manufacturer Test Certificates (MTC) supplied in accordance with EN 10204 3.1 / 3.2, including raw material heat traceability, chemical composition analysis, and third-party inspection (TPI) release notes.
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