Connection Fasteners Manufacturer in India — Structural & HSFG Bolts for Safe Load Transfer
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.
Experience
Connection Fasteners Manufactured for Steel Structure Load Transfer
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
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.
Connection Fasteners We Manufacture
Structural / HSFG Bolt Assemblies
Hex Bolts, Nuts & Washers
Tie Rods & Turnbuckles
Couplers & Connectors
Stud Bolts
U-Bolts & Pipe Clamps
Full Specifications of Our Connection Fasteners
| Specification | Range / Options |
|---|---|
| Product Range | Structural / HSFG bolts, nuts, washers, tie rods, turnbuckles, couplers |
| Size Range | M8 to M100 (custom sizes available) |
| Length | As per drawing or project requirement |
| Materials | MS, Carbon Steel, High-Tensile Alloy Steel, SS304, SS316 |
| Grades | 4.6, 5.6, 8.8, 10.9, 12.9 |
| Standards | IS 1367, IS 3757, ASTM A325 / A490, ISO 898-1 |
| Surface Finishes | Plain, Hot-Dip Galvanised, Zinc Plated, Black Oxide, Painted, SS Mill |
| Documentation | Mill Test Certificates (MTCs), Inspection Reports |
| Delivery | PAN India + Export |
Material Grades We Supply
| Material | Description |
|---|---|
| MS | Cost-efficient, versatile mild steel for general structural use |
| Carbon Steel | Strong and dependable for industrial anchoring applications |
| High-Tensile Alloy Steel | Maximum load-bearing capacity for critical installations |
| SS304 | Austenitic stainless — corrosion resistance for general environments |
| SS316 | Marine-grade stainless — superior resistance to chlorides and chemicals |
Standards & Grades
| Standard | Detail |
|---|---|
| IS 1367 | Mechanical properties of threaded steel fasteners |
| IS 3757 | High-strength friction grip (HSFG) structural bolts |
| ASTM A325 / A490 | US standard for structural HSFG bolts |
| ISO 898-1 | Global tensile-strength standard for steel fasteners |
| Bolt Grades | 4.6, 5.6, 8.8, 10.9, 12.9 — selected to load requirement |
Surface Finishes Available
How We Build Your Connection Fasteners
Engineering Review
We review your structural drawings, design loads and specifications before production begins.
Raw Material Sourcing
Certified mill steel is selected and verified with incoming inspection and testing.
Forging, CNC & Threading
Precision bending, forging, CNC machining and thread-rolling deliver dimensional accuracy.
QC & Dispatch
Dimensional inspection, finishing and MTC documentation before secure PAN India dispatch.
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.
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, ChennaiBulk hex bolt-nut-washer sets in multiple grades, delivered on time across two sites.
Praveen K. Procurement, PuneTie rods and turnbuckles for a tensioned canopy were precise and adjustable. Great quality.
Sankar M. Project Engineer, HyderabadLocations We Serve
From our facility in Ambattur, Chennai — we supply to industrial hubs across India and ship internationally.
Chennai & Tamil Nadu
Ambattur · Guindy · Perungudi · Tambaram · Sriperumbudur
Manali · Madhavaram · Oragadam · Maraimalai Nagar · Padi · Avadi
Coimbatore · Trichy · Madurai · Salem · Hosur · Erode
PAN India
Mumbai · Bangalore · Hyderabad · Pune · Delhi NCR
Kolkata · Ahmedabad · Visakhapatnam · Vadodara · Surat
and all major industrial cities
International Export
UAE · Saudi Arabia · Qatar · Oman · Bahrain
Sri Lanka · Nepal · Bangladesh · Singapore
Malaysia · Africa · and more
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.
Explore Our Products
Foundation & anchor bolts, bracing systems, fasteners and fabrication — tap any product to view full 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
