Fastener Material Grades | ASTM, ASME & ISO Certified | Asia Bolts Dubai

High-Performance Materials for Critical Industrial Applications

Asia Bolts Industries manufactures fasteners from internationally approved raw materials at our Dubai Investment Park facility — the largest fastener manufacturing complex in the Middle East. Every material grade we stock is fully traceable, mill-certified, and supplied with a full Material Test Report (MTR) confirming chemical composition and mechanical properties to ASTM, DIN, ISO and ASME requirements. From standard alloy steel studs for oil & gas flanges to exotic Inconel and Hastelloy fasteners for extreme-temperature service, we manufacture to your specification with full heat-number traceability from raw bar to finished fastener.

Our Fastener Material Range

Alloy Steel Fasteners

High-strength alloy steel fasteners for high-pressure, high-temperature service in oil & gas, petrochemical and power generation. Supplied with full MTR and heat-number traceability. Manufactured to ASTM, ASME and EN standards with hardness testing, tensile and impact certification available.

Grades supplied:

Matching nut grades: ASTM A194 2H, 2HM (sour service), 7, 7M, 4, 16

Washers: F436 hardened / F844 plain NACE MR0175

compliant grades available on request

Stainless Steel Fasteners

Austenitic and precipitation-hardened stainless-steel fasteners for corrosive, marine, chemical and food-grade environments. Available in passivated or electro-polished finish. Compliant with ASTM F593, F594 and A193 B8/B8M series.

Grades supplied:

  • SS304
  • SS304L
  • SS316
  • SS316L
  • ASTM A193 B8
  • ASTM A193 B8M
  • ASTM F593
  • SS321
  • SS347
  • 17-4 Ph (S17400 / SS630)

Matching nut grades: ASTM A194 Grade 8 (for B8), Grade 8M (for B8M), Grade 8F (for 303 stainless)

Washers: F436 / F844 in 304 or 316 Electro-polish finish available

Structural Fastener Grades

Heavy-duty structural bolts, nuts and washers for steel construction, bridges, cranes and infrastructure across the GCC. Hot-dip galvanized or plain finish, supplied in bolt assemblies per ASTM and ISO standards.

Grades supplied:

Matching nut grades: ASTM A563 Grade DH / DH3 (for A325 & A490); ISO 4032 Grade 8 / 10

Hot-dip galvanised assemblies to ISO 1461 available Bolt assemblies per ASTM F3125 / ISO 16432 available

Duplex & Super Duplex Fasteners

Duplex and super duplex stainless fasteners combining high mechanical strength with exceptional resistance to pitting, crevice corrosion and chloride stress corrosion cracking. Ideal for offshore platforms, seawater systems and H2S sour service environments. NACE MR0175 / ISO 15156 compliant grades available.

Grades supplied:

  • UNS S31803 (2205)
  • UNS S32205
  • UNS S32750 (2507 super duplex)
  • UNS S32760 (Zeron 100)
  • UNS S32101 (lean duplex)

Matching nut grades: ASTM A194 Grade 2HM (for duplex studs); EN ISO 3506 A4-70 / A4-80 equivalent

NACE MR0175 / ISO 15156 compliance documentation suppliedPREN certificates and impact test reports available

High Nickel Alloy Fasteners

Precision-machined nickel alloy fasteners for extreme-temperature, high-pressure and highly corrosive service conditions in petrochemical, offshore and power generation applications. Supplied with material certifications to ASTM B164, B865, B637 and AMS standards.

Grades supplied:

  • Inconel 625 (UNS N06625)
  • Inconel 718 (UNS N07718)
  • Monel 400 (UNS N04400)
  • Monel K-500 (UNS N05500)
  • Hastelloy C-276 (UNS N10276)
  • Hastelloy C-22 (UNS N06022)
  • Alloy 20 (UNS N08020)
  • Titanium Gr.2 / Gr.5

Matching nut grades: Matching nuts in same alloy grade per ASTM B164 (Monel), B160 (Nickel 200), B574 (Hastelloy), B446 (Inconel 625)

Titanium Gr.2 (UNS R50400) & Gr.5 (UNS R56400) also available — see Titanium section belowAMS and NACE MR0175 certifications available on request

Carbon Steel Fasteners

Standard and high-strength carbon steel fasteners for general construction, infrastructure and mechanical applications. In-house hot-dip (ISO 1461) AND electro-zinc (ASTM B633) available. Full material test certificates supplied with every order. The highest-volume grade family we manufacture — stocked for fast dispatch across the GCC

Grades supplied:

  • ASTM A307 Grade A/B
  • SAE Grade 5 (ISO 8.8)
  • SAE Grade 8 (ISO 10.9)
  • ASTM A449
  • DIN 4.6 / 6.8 / 8.8
  • ISO 898 Class 4.6 to 10.9

Matching nut grades: ASTM A563 Grade A (for A307); ASTM A563 Grade C / DH (for SAE Gr.5 / Gr.8); DIN 934 Grade 6 / 8 / 10

Hot-dip galvanising (ISO 1461) and electro-zinc (ASTM B633) are separate processesWasher: F844 plain / F436 hardened; DIN 125 / DIN 9021 available

Titanium Fasteners

Titanium fasteners offer an outstanding strength-to-weight ratio combined with exceptional corrosion resistance in seawater, chlorinated media, and oxidising environments — without the weight penalty of stainless or nickel alloys. Widely specified for offshore topsides, desalination plants, chemical reactors, and aerospace structural assemblies. Manufactured to ASTM B348 / AMS 4928 with full traceability.

Grades supplied:

  • Titanium Grade 2 (UNS R50400) — commercially pure, maximum corrosion resistance, marine & desalination
  • Titanium Grade 5 / Ti-6Al-4V (UNS R56400) — high-strength aerospace and structural grade
  • Titanium Grade 7 (UNS R52400) — Pd-stabilised, superior crevice corrosion resistance
  • Matching nut grades: ASTM F467 (titanium nuts, Gr.2 / Gr.5); ASTM F468 (titanium bolts / screws)

Industry-to-Material Quick Guide

Use the table below to identify the correct fastener material and grade for your application. All specifications include the matching nut and washer grade required for a compliant bolt assembly.

Oil & Gas Flanges & ValvesASTM A193 B7 stud bolts + ASTM A194 2H heavy hex nuts, plain or hot-dip galvanised. For high-temperature service above 450°C, upgrade to A193 B16 + A194 4 or 16 nuts.
H2S / Sour Service (NACE)ASTM A193 B7M stud bolts + ASTM A194 2HM nuts. Hardness controlled to max 22 HRC per NACE MR0175 / ISO 15156. All parts supplied with hardness test certificates.
Offshore & Marine PlatformsDuplex UNS S31803/S32205 or Super Duplex S32750 with ASTM A194 2HM nuts. For splash zone / seawater immersion: Titanium Gr.2 bolts + ASTM F467 Gr.2 nuts. PREN > 40 minimum for fully immersed service.
Structural Steel ConstructionASTM A325 (ISO 8.8) or A490 (ISO 10.9) bolts + ASTM A563 DH nuts + F436 hardened washers. Hot-dip galvanised assemblies to ISO 1461 for corrosive environments. DIN 6914 / DIN 6915 / DIN 6916 high-strength sets also available.
High-Temperature PetrochemicalASTM A193 B16 stud bolts (up to 650°C) + A194 Grade 4 or 16 nuts. For extreme service above 650°C or highly corrosive media: Inconel 625 (UNS N06625) with matching Inconel nuts to ASTM B446.
Seawater & Desalination PlantsSuper Duplex UNS S32750 / S32760 for pump casings and pipework connections. Titanium Gr.2 for high-purity or chlorinated water service. Both supplied with matching nut grades and PREN certificates.
Chemical & Acid ProcessingAlloy 20 (UNS N08020) for sulphuric acid service + matching Alloy 20 nuts (ASTM B473). Hastelloy C-276 (UNS N10276) for hydrochloric and oxidising acid environments. Monel 400 (UNS N04400) for hydrofluoric acid service.
Power Generation & TurbinesASTM A193 B16 + A194 Grade 16 for steam turbine bolting up to 650°C. Inconel 718 (UNS N07718) for gas turbine applications up to 700°C. Full mechanical and creep-rupture testing available on request.
General Construction & CivilCarbon Steel ISO 898 Class 8.8 / 10.9 + ISO 4032 Grade 8 / 10 nuts + ISO 7093 washers. Zinc-plated to ASTM B633 or hot-dip galvanised to ISO 1461 for outdoor or corrosive exposure.

Material Test Reports:

Every material we supply comes with a full Material Test Report (MTR) confirming chemical composition, mechanical properties, heat number, and applicable standard. Request your MTR pack when placing an enquiry or contact our technical team to discuss certification requirements for your project.