Product Category

Nuts &Bolts

High-strength nuts and bolts in all grades, materials and international standards — manufactured and exported to EPC contractors, OEMs and distributors in 50+ countries worldwide.

500+ SKUs

ISO 9001:2015

DIN · ISO · ASME

M3 to M100

CS · SS · Alloy · Inconel

48hr Dispatch

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Nuts & Bolts Range

Every type, every grade, every standard — from standard hex bolts to high-strength structural assemblies and exotic material fasteners.

Nuts

15+ Types

Bolts

20+ Types

Materials

Materials & Grades Available

We manufacture nuts and bolts in a wide range of metals — from standard carbon steel to exotic high-performance alloys.

Most Common

Carbon Steel

Cost-effective and widely available. Standard for most construction and engineering applications requiring good strength without special corrosion resistance.

Grade 4.6Grade 8.8Grade 10.9Grade 12.9A307A325

Corrosion Resistant

Stainless Steel

Excellent corrosion resistance for marine, chemical, food-grade and outdoor applications. Available in all major austenitic and duplex grades.

SS 304 / A2SS 316 / A4SS 316LSS 310SS 321SS 410

High Strength

Alloy Steel

High-strength alloy steel for critical bolting in oil & gas, power plants and heavy engineering. Ideal for high-temperature and high-pressure flanged joints.

B7 / A193L7 / A32041404340A325A490

Offshore Grade

Duplex & Super Duplex

Superior strength and corrosion resistance for subsea, offshore and aggressive chemical environments. Better than standard SS in chloride-containing environments.

Duplex 2205Super Duplex 2507S31803S32750

High Temperature

Inconel & Hastelloy

Nickel-chromium superalloys for extreme temperatures and corrosive environments — petrochemical, turbines and aerospace bolting applications.

Inconel 600Inconel 625Inconel 718Hastelloy C276

Electrical & Marine

Brass & Monel

Excellent electrical conductivity and seawater resistance. Brass for electrical/plumbing applications; Monel 400 for marine and chemical processing.

Brass CuZnC360Monel 400Monel K500

Product Details

Know Your Fastener

Click any product to see full specifications, standards, material options and application guide.

Bolt

Hex Bolts — Full Thread & Part Thread

DIN 931 / DIN 933 · ISO 4014 / ISO 4017 · ASME B18.2.1

Description

The most widely used fastener in industrial and construction applications. Available in full thread (DIN 933) and part thread (DIN 931) versions. Hex head for use with standard spanners and socket sets.

Applications

Structural steelwork · Machinery assembly · Flanged pipe joints · EPC projects · General engineering · Automotive

Grades & Standards

DIN 931 — Part Thread DIN 933 — Full Thread ISO 4014 / 4017 ASME B18.2.1 IS 1363 / IS 1364 Grade 4.6 · 8.8 · 10.9 · 12.9 A2-70 · A4-70 (SS) Size: M4 – M100

Stud

Stud Bolts — Flange & Tap End

ASTM A193 B7 · A320 L7 · ASME B16.5

Description

Fully threaded rods used to clamp pipe flanges together. Always paired with heavy hex nuts (A194 2H). Available in flange stud (fully threaded) and tap-end stud (one threaded end) versions.

Applications

Oil & gas flanged joints · Pressure vessels · Petrochemical piping · High-temp/pressure systems · Refineries & power plants

Grades & Standards

ASTM A193 B7 — Most Common ASTM A193 B7M — Sour Service ASTM A320 L7 — Low Temp ASTM A193 B8 — SS 304 ASTM A193 B8M — SS 316 Paired Nut: A194 2H · 2HM · 8M Size: ½” – 4″ / M10 – M100

Nut

Hex Nuts — Standard & Heavy Hex

DIN 934 · ISO 4032 · ASTM A194 · ASME B18.2.2

Description

Standard hex nuts for all general applications. Heavy hex nuts have a larger across-flat dimension and thicker bearing face — required for high-strength and high-pressure applications, especially with stud bolts on flanges.

Applications

All general engineering · Structural steelwork · Flange bolting (Heavy Hex) · Machinery · Automotive · Infrastructure

Types & Standards

DIN 934 — Standard Hex ISO 4032 — Standard Hex ASME B18.2.2 — Heavy Hex ASTM A194 2H — Heavy Hex ASTM A194 2HM — Sour Service Class 6 · 8 · 10 · 12 A2 (SS304) · A4 (SS316) Size: M3 – M100

Bolt

Structural Bolts — EN 14399 & ASTM A325/A490

High-Strength Preloading Assemblies for Structural Steel

Description

High-strength bolting assemblies for structural steel connections where preloading (pretensioning) is required. Supplied as a complete assembly — bolt + nut + washer(s) — tested and certified together.

Applications

Steel frame buildings · Bridges & flyovers · Industrial structures · Heavy machinery foundations · Offshore jackets & topsides

Standards & Systems

EN 14399-3 — HR System EN 14399-4 — HV System ASTM A325 — Medium Carbon ASTM A490 — Alloy Steel Property Class 8.8 / 10.9 Size: M16 – M36 CE Marked Available

Coating

Surface Finishes & Coatings

Corrosion Protection Options for All Environments

Available Finishes

We offer a full range of protective coatings and surface treatments to suit every environment — from indoor mechanical assemblies to offshore marine exposure.

Coating Options

Plain / Self Colour Zinc Plated — Blue/Yellow/Clear Hot Dip Galvanized (HDG) Black Oxide (Black Passivation) Nickel Plated — Electro/Electroless Teflon / PTFE Dry Film Geomet / Delta Protekt Dacromet Coating

Why RR Hydraulic

Manufactured to Your Exact Specification

Every nut and bolt we supply is manufactured under ISO 9001:2015 quality controls with full material traceability and documentation.

ISO 9001:2015 Certified — Full MTRs, dimensional inspection and third-party certificates on request
M3 to M100 — Largest size range from standard to jumbo fasteners in any grade
Custom Manufacturing — Non-standard sizes, special lengths and exotic materials to your drawing
48-Hour Dispatch — In-stock items dispatched within 48 hours to any destination worldwide
Best Price Guarantee — Factory-direct pricing, no middlemen — we match any verified competitor quote