Welcome to our E S HAJI & CO!

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(+91) 994 009 7572 / 89563 56925

Monday to Friday

9:00am - 6:00pm

E-mail us

info@eshaji.in

Chennai's Trusted Manufacturer — Since 1994

Connection
Fasteners
Manufacturer

Structural and HSFG bolts, nuts, washers, tie rods, turnbuckles and couplers for safe load transfer in steel structures. M8–M100, grades to 12.9, custom and bulk supply.

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30+ Years of Manufacturing Experience
M8 – M100 Diameter / Size Range
HSFG High-Strength Assemblies
PAN India + Export Delivery
Size Range
M8 – M100
Bolt Grades
4.6 – 12.9
Standards
IS 1367 / IS 3757 / A325 / A490
Materials
MS · CS · SS304/316 · Alloy
Delivery
PAN India + Export
Connection Fasteners manufactured by E S Haji & Co
30+ Years of
Experience
M8–M100 Size Range
12.9 Max Grade
PAN India + Export
MTC Certified
IS 3757
ASTM F1554
About Our Bolt Division

Leading Connection Fasteners Manufacturer & Supplier in India

E S Haji & Co. is a leading manufacturer of high-quality Connection Fasteners for structural, industrial and engineering applications. With decades of manufacturing expertise and advanced production technology, we deliver fastening solutions that ensure strength, stability and long-term reliability for critical steel connections.

Our connection fasteners are manufactured from premium-grade materials using precision machining and thread-rolling to achieve superior load capacity, dimensional accuracy and corrosion resistance. We supply across India to infrastructure companies, contractors, OEMs and engineering firms with dependable products and timely delivery.

Connection fasteners are the mechanical components — structural bolts, nuts, washers, tie rods, turnbuckles and couplers — used to securely join steel members, machinery parts and structural assemblies. They transfer loads efficiently, maintain alignment and improve the overall integrity and safety of a structure. High-strength friction grip (HSFG) bolt assemblies and matched nut-washer sets are central to bolted steel connections in buildings, bridges and industrial plants.

Size Range

M8 – M100

Grades

4.6 – 12.9

Standards

IS 1367 / IS 3757 / A325 / A490

Materials

MS · CS · SS304/316 · Alloy

Certification

Mill Test Certificates (MTC) with every batch

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Why Choose Us

Key Benefits of Our Connection Fasteners

Every connection fasteners we manufacture is built to perform under demanding load and site conditions.

Efficient Load Transfer

Engineered for reliable force transfer across steel joints

High-Strength Options

HSFG and grade 10.9 / 12.9 assemblies for critical connections

Dimensional Accuracy

Precision threads for proper fit-up and torque control

Corrosion Resistance

Galvanised and stainless options for outdoor and coastal sites

Bulk & Custom Supply

Standard and made-to-drawing fasteners at volume

Custom Manufacturing to Drawing

Diameter, length, thread and finish produced exactly to your engineering drawing.

MTC Documentation

Every order backed by Mill Test Certificates confirming grade, chemistry and mechanical properties.

Certified Materials & MTCs

Premium-grade certified steel supplied with Mill Test Certificates on every batch.

Our Product Range

Connection Fasteners We Manufacture

Structural / HSFG Bolt Assemblies

High-strength friction grip bolt, nut and washer sets for slip-critical steel connections.
Applications: Steel building connections, Bridge girder splices, Heavy structural joints
Materials: High-Tensile Alloy Steel (8.8 / 10.9)

Hex Bolts, Nuts & Washers

Matched hexagon bolt, nut and washer sets in a full range of sizes and grades.
Applications: General steel assembly, Equipment mounting, Plant maintenance
Materials: MS, Carbon Steel, SS304 / SS316

Tie Rods & Turnbuckles

Adjustable tension tie rods and turnbuckles for bracing and load-balancing systems.
Applications: Roof and wall bracing, Tensioned canopies, Adjustable bracing systems
Materials: Carbon Steel, Galvanised Steel

Couplers & Connectors

Threaded couplers and connectors for joining rods and extending fastener assemblies.
Applications: Rod extensions, Brace and sag rod joints, Modular steelwork
Materials: Carbon Steel, Stainless Steel

Stud Bolts

Double-ended threaded studs that provide controlled clamping load in high-pressure flanged connections.
Applications: Flanged pipe joints, Pressure vessels, Heat exchangers
Materials: Carbon Steel, Alloy Steel (B7 / L7), SS304 / SS316

U-Bolts & Pipe Clamps

U-shaped fasteners that secure pipes, beams and structural members firmly to support frames and brackets.
Applications: Pipe supports, Beam clamping, Cable tray mounting
Materials: MS, Carbon Steel, Hot-Dip Galvanised Steel
Technical Data

Full Specifications of Our Connection Fasteners

SpecificationRange / Options
Product RangeStructural / HSFG bolts, nuts, washers, tie rods, turnbuckles, couplers
Size RangeM8 to M100 (custom sizes available)
LengthAs per drawing or project requirement
MaterialsMS, Carbon Steel, High-Tensile Alloy Steel, SS304, SS316
Grades4.6, 5.6, 8.8, 10.9, 12.9
StandardsIS 1367, IS 3757, ASTM A325 / A490, ISO 898-1
Surface FinishesPlain, Hot-Dip Galvanised, Zinc Plated, Black Oxide, Painted, SS Mill
DocumentationMill Test Certificates (MTCs), Inspection Reports
DeliveryPAN India + Export

Material Grades We Supply

MaterialDescription
MSCost-efficient, versatile mild steel for general structural use
Carbon SteelStrong and dependable for industrial anchoring applications
High-Tensile Alloy SteelMaximum load-bearing capacity for critical installations
SS304Austenitic stainless — corrosion resistance for general environments
SS316Marine-grade stainless — superior resistance to chlorides and chemicals

Standards & Grades

StandardDetail
IS 1367Mechanical properties of threaded steel fasteners
IS 3757High-strength friction grip (HSFG) structural bolts
ASTM A325 / A490US standard for structural HSFG bolts
ISO 898-1Global tensile-strength standard for steel fasteners
Bolt Grades4.6, 5.6, 8.8, 10.9, 12.9 — selected to load requirement

Surface Finishes Available

Hot-Dip Galvanising Recommended for outdoor and coastal Chennai applications with high chloride exposure.
Zinc Electroplating Cost-effective rust protection for indoor and dry-environment use.
Black Oxide Mild corrosion protection with a clean, dark finish.
Industrial Paint Applied per project specification and colour requirement.
Stainless Steel Mill Finish Inherent corrosion resistance — no additional coating required.
Epoxy / PTFE Coating High-performance coating for aggressive chemical and marine environments.
Our Manufacturing Process

How We Build Your Connection Fasteners

01

Engineering Review

We review your structural drawings, design loads and specifications before production begins.

02

Raw Material Sourcing

Certified mill steel is selected and verified with incoming inspection and testing.

03

Forging, CNC & Threading

Precision bending, forging, CNC machining and thread-rolling deliver dimensional accuracy.

04

QC & Dispatch

Dimensional inspection, finishing and MTC documentation before secure PAN India dispatch.

Industry Applications

Industries We Serve

Connection Fasteners from E S Haji & Co are trusted across construction, energy and process industries throughout India.

Steel Construction

Building frames, bracing and connections

Pre-Engineered Buildings

Purlin, girt and frame connections

Bridges & Infrastructure

Girder splices and structural joints

Industrial Plants

Equipment assembly and maintenance

OEM Manufacturing

Machinery and fabricated assemblies

Oil & Gas Refineries

Anchoring and supports for pipelines, plants and offshore installations.

Power Generation

Fasteners for transformers, towers, switchyards and turbine bases.

Renewable Energy

Bases for wind turbines and solar mounting structures.

Mining & Heavy Equipment

Fasteners for conveyors, crushers and structural supports in mining plants.

Client Testimonials

What Our Clients Say

★★★★★

HSFG bolt assemblies for a bridge girder splice arrived matched and certified. Slip-critical joints torqued perfectly.

Rahul J. Bridge Engineer, Chennai
★★★★★

Bulk hex bolt-nut-washer sets in multiple grades, delivered on time across two sites.

Praveen K. Procurement, Pune
★★★★★

Tie rods and turnbuckles for a tensioned canopy were precise and adjustable. Great quality.

Sankar M. Project Engineer, Hyderabad

Looking for a Reliable Connection Fasteners Manufacturer in India?

From standard sizes to fully custom configurations — we manufacture to your exact drawings, deliver on time and back every order with MTC certification.

Request a Free Quote →
Service Area

Locations We Serve

From our facility in Ambattur, Chennai — we supply to industrial hubs across India and ship internationally.

🏭

Chennai & Tamil Nadu

Local Supply — Fast Delivery

Ambattur · Guindy · Perungudi · Tambaram · Sriperumbudur
Manali · Madhavaram · Oragadam · Maraimalai Nagar · Padi · Avadi
Coimbatore · Trichy · Madurai · Salem · Hosur · Erode

🇮🇳

PAN India

All Major Industrial Hubs

Mumbai · Bangalore · Hyderabad · Pune · Delhi NCR
Kolkata · Ahmedabad · Visakhapatnam · Vadodara · Surat
and all major industrial cities

✈️

International Export

Export Ready — MTC Certified

UAE · Saudi Arabia · Qatar · Oman · Bahrain
Sri Lanka · Nepal · Bangladesh · Singapore
Malaysia · Africa · and more

FAQ

Frequently Asked Questions

Common questions about our connection fasteners manufacturing and supply.

  • What are connection fasteners?

    Connection fasteners are the structural bolts, nuts, washers, tie rods, turnbuckles and couplers used to join steel members and assemblies. They transfer loads, maintain alignment and ensure the integrity and safety of bolted steel connections.

  • Do you supply HSFG / high-strength structural bolt assemblies?

    Yes. We supply high-strength friction grip (HSFG) bolt, nut and washer assemblies in grades 8.8 and 10.9 conforming to IS 3757 / ASTM A325 / A490 for slip-critical steel connections.

  • What sizes of connection fasteners do you manufacture?

    We manufacture connection fasteners from M8 to M100, with custom sizes and lengths produced to drawing or project requirement.

  • What is the difference between structural bolts and HSFG bolts?

    Structural bolts are general-purpose high-strength fasteners used in bearing-type connections. HSFG bolts are specifically designed for slip-critical joints where clamping friction transfers the load, requiring controlled tightening torque and matched nut-washer assemblies.

  • Which materials and finishes are available?

    Fasteners are available in mild steel, carbon steel, high-tensile alloy steel, SS304 and SS316, with plain, hot-dip galvanised, zinc-plated, black oxide and painted finishes.

  • Do connection fasteners come with test certificates?

    Yes. Every batch is supplied with Mill Test Certificates (MTCs) confirming material grade, chemistry and mechanical properties.

  • Can you supply connection fasteners in bulk PAN India?

    Yes. We supply standard and custom connection fasteners in bulk across Mumbai, Bangalore, Hyderabad, Pune, Delhi NCR and all major industrial hubs with reliable lead times.

  • Do you manufacture custom connection fasteners to drawing?

    Yes. We manufacture connection fasteners to customer drawings and project specifications. Diameter, length, thread pitch, grade and surface finish are all produced to your exact requirement with MTC documentation.

Our Product Range

Explore Our Products

Foundation & anchor bolts, bracing systems, fasteners and fabrication — tap any product to view full details.

L Type Foundation Bolts 90° bent anchor bolts for column base plates & general anchoring. View details → J Type Foundation Bolts J-hook bolts with high pull-out resistance for towers & poles. View details → T Type Foundation Bolts T-head bolts with wide bearing for machinery bases & crane rails. View details → Plate Type Foundation Bolts Welded-plate bolts for very high uplift & tension capacity. View details → Light Pole Foundation Bolts Galvanised anchor-bolt cages with templates for lighting poles. View details → Pipe Stiffener Bolts Pipe stiffeners & matched bolts for pipeline supports. View details → Foundation Bolts Custom foundation bolts manufactured in Chennai, M12–M100. View details → Anchor Bolts Pre-set & post-installed anchor bolts for structures & equipment. View details → Z Sag Rods Z-bent & threaded sag rods for purlin and girt support in PEB. View details → Brace Rods Diagonal & X-brace tension rods for lateral stability. View details → Brace Rod Connectors Couplers, clevises, wing connectors & turnbuckles for bracing. View details → Connection Fasteners Structural & HSFG bolts, nuts, washers, tie rods & couplers. View details → Hillside Washers Beveled washers that square the nut to a sloped rod or bolt. View details → Steel Fabrication Precision steel fabrication for industrial & structural projects. View details → Structural Fabrication Beams, columns, trusses & frames fabricated to specification. View details → Heavy Steel Fabrication Heavy plate & section fabrication for demanding load conditions. View details → Custom Metal Fabrication Bespoke metal fabrication built to your drawings & tolerances. View details → Custom Flanges Custom flanges in all standards, sizes, materials & finishes. View details →

Get in touch

You will find yourself working in a true partnership that results in an incredible experience, and an end product that is the best.

Call us on

(+91) 994 009 7572 / 89563 56925

Email us

info@eshaji.in

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