BestsellerAlloy Steel
ASTM A193 Grade B7 Bolts
High tensile Cr-Mo alloy steel bolting for high-pressure and high-temperature service.
Get a quote →Manufacturer & Exporter — Bolts, Studs & Nuts
Custom & standard fasteners, engineered to your spec
Premium bolts, studs and nuts manufactured to precision — trusted by space, infrastructure, chemical and machine-building industries since 1997.
- ✔ Since 1997
- ✔ Exporting to 90+ countries
- ✔ ASTM / ISO grades
- ✔ On-time delivery
Since 1997Precision Fasteners
Trusted by leading companies across industries
Space ProgramsInfrastructureChemicalMachine MfgProcess PlantsOEMs
30
Years of Experience
10K+
Product Configurations
90+
Countries Served
100%
Quality Checked
Industries We Serve
Trusted Across Critical Sectors
From space programs to heavy infrastructure, our fasteners perform where it matters.
🚀
Space & Defense
High-integrity fasteners engineered to demanding aerospace and defense tolerances.
🛢️
Oil & Gas / Process
B7, duplex and super duplex bolting for pipelines, valves and offshore service.
⚗️
Chemical Industry
Quality-sensitive fasteners that withstand aggressive media and process equipment.
🏗️
Infrastructure
High-strength structural fasteners (8.8 & 10.9) for major projects and heavy construction.
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Machine Manufacturing
Custom and standard fasteners for large machine builders and OEMs.
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Marine
Corrosion-resistant SS 316, duplex and Monel fasteners for seawater exposure.
Manufacturing Capabilities
What We Make
Core fastener forms and manufacturing expertise.
Custom Fasteners
Made to your exact design & specification.
Bolts & Studs
Standard & heavy hex, stud bolts, threaded rods.
Nuts
Hex, heavy hex and special profile nuts.
Threading
Metric, imperial, UNI, and custom threads.
Finishes & Coatings
Galvanized, zinc, PTFE, phosphate & more.
Why NR Engineering
Engineered for Your Success
Service, efficiency, quality and reliability — four pillars we excel on.
Grade Compliance
ASTM / ISO / DIN grades manufactured & certified to spec.
Wide Material Range
Alloy, SS, duplex, Inconel, Monel, nickel alloy and titanium.
Custom to Your Design
Fasteners engineered precisely to your drawings.
Strict QC / Testing
100% quality-checked with test certificates available on demand.
On-Time Delivery
Reliable scheduling and consistent, dependable supply.
Global Logistics
Exporting to 90+ countries with trusted partners.
Quality
Quality You Can Depend On
Every lot is inspected and verified so your fasteners meet specification, every time.
- ✔ Raw material traceability & mill test certificates
- ✔ Grade verification and dimensional inspection
- ✔ Test certificates provided on demand
- ✔ In-house quality inspection process
Material Traceability
Mill test certificates on raw material.
Dimension Verification
Precise grade & dimensional checks.
Test Certificates
Provided with product on demand.
Global Standards
ASTM, ISO and DIN compliance.
Our Journey
Over Three Decades of Expertise
1997
N. R. Engineering founded with a customer-first focus.
2000s
Expanded manufacturing plant and product range.
2015
Grew export footprint across global markets.
2026
Trusted by space, infrastructure and industrial customers worldwide.
Client Testimonials
What Our Customers Say
★★★★★
“We depend on high quality industrial fasteners and don't hesitate to recommend N. R. Engineering for their quality. Especially B7 bolts and related fasteners.”
Leading Chemical Industry
★★★★★
“Whether it is detailing, finishing or strength, we trust fasteners from N. R. Engineering. Thanks for supporting us for almost 10 years now.”
Major Infrastructure Organization
★★★★★
“N. R. Engineering also helps us solve complex problems involving industrial specifications for our Space Research products.”
Leading Part Manufacturer, Space Programs
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Lightweight, corrosion-resistant fasteners for aerospace and critical applications.
Get a quote →Materials & Grades
A Fastener for Every Material
Explore our complete range of materials and grades.
Alloy Steel→
Stainless Steel (304/316/660)→
Duplex→
Super Duplex→
Inconel→
Monel→
Nickel Alloy→
Titanium→
Need fasteners engineered to your specification?
Get a detailed quote from our engineering team — standard or fully custom.