Product Overview
Stainless Steel Fastener Stockist & Supplier in India
Stainless steel fasteners are essential mechanical components used to join,
secure, clamp, or assemble equipment, structures, pipelines, machinery, and
industrial systems. As a reliable Stainless Steel Fastener Stockist in India
and Stainless Steel Fastener Supplier in India, Metal-Link Steel & Alloys
supplies a comprehensive range of bolts, nuts, screws, studs, washers,
threaded rods, and other fastening components in corrosion-resistant stainless
steel grades.
A Stainless Steel Fastener offers an effective combination of mechanical
strength, corrosion resistance, durability, and long service life. The correct
grade and property class should be selected according to the service
environment, applied load, temperature, exposure to chlorides, and applicable
engineering standards.
With an established presence since 1985 and ISO 9001:2015, ISO 14001:2015 and
ISO 45001:2018 certifications, Metal-Link supports stainless steel fastener
requirements with material traceability, inspection documentation and
project-based supply.
Get
Factory Rates →
Datasheet
Stainless Steel Fastener Specifications
| Specification |
Details |
| Product |
Stainless Steel Fasteners |
| Material Grades |
304 / 304L, 316 / 316L, 310 |
| Property Classes |
A2-50, A2-70, A4-50, A4-70, A4-80 |
| Standards |
ASTM A193, ASTM A194, ASTM F593, ASTM F594,
ISO 3506, ASME B18.2.1, ASME B18.2.2 |
| Types Available |
Hex Bolts, Heavy Hex Bolts, Stud Bolts, Hex Nuts,
Heavy Hex Nuts, Threaded Rods, Machine Screws, Socket
Head Cap Screws, Set Screws, Flat Washers, Spring
Washers, Lock Washers, U-Bolts, Anchor Bolts, Eye
Bolts, Carriage Bolts |
| Thread Types |
Metric, UNC, UNF, and other thread forms as
required |
| Product Form |
Cold Forged / Hot Forged / Machined |
| Application |
Industrial, Marine, Chemical, Structural & Process
Systems |
Product Range
Types of Stainless Steel Fasteners
As an experienced Stainless Steel Fastener Supplier in India, Metal-Link
supplies fastening solutions for industrial, commercial, marine, structural,
and process applications. Our product range includes:
-
✓
Stainless Steel Hex Bolts
-
✓
Stainless Steel Heavy Hex Bolts
-
✓
Stainless Steel Hex Nuts
-
✓
Stainless Steel Heavy Hex Nuts
-
✓
Stainless Steel Stud Bolts
-
✓
Stainless Steel Threaded Rods
-
✓
Stainless Steel Machine Screws
-
✓
Stainless Steel Socket Head Cap Screws
-
✓
Stainless Steel Set Screws
-
✓
Stainless Steel Flat Washers
-
✓
Stainless Steel Spring Washers
-
✓
Stainless Steel Lock Washers
-
✓
Stainless Steel U-Bolts
-
✓
Stainless Steel Anchor Bolts
-
✓
Stainless Steel Eye Bolts
-
✓
Stainless Steel Carriage Bolts
Types of Stainless Steel Bolts
Hex BoltsWidely used for
mechanical assemblies and structural connections. Their hexagonal head
allows tightening with standard spanners or sockets.
Stud BoltsThreaded at both
ends and commonly used in flanged joints, pressure equipment, valves,
and industrial piping systems.
U-BoltsUsed to support,
clamp, or secure pipes, tubes, cables, and structural members.
Commonly used in piping support systems and industrial
installations.
Anchor BoltsDesigned to
secure equipment or structural components to concrete foundations or
supporting structures.
Eye BoltsInclude a circular
lifting or attachment point and are used for lifting, securing, or
connecting equipment where the design and load requirements permit
their use.
Carriage BoltsFeature a
smooth, domed head with a square neck below that prevents rotation
during tightening, commonly used in timber and structural
assemblies.
Stainless Steel Nuts & Washers
Hex NutsInternally threaded
components used with bolts and studs to create removable mechanical
joints.
Lock NutsDesigned to provide
improved resistance to loosening caused by vibration or dynamic
loading. The specific locking mechanism should be selected according
to the application.
Flat WashersDistribute the
clamping load over a larger surface area and can help protect the
connected material from localized damage.
Spring WashersProvide an
elastic element within the joint assembly and are used in applications
where maintaining joint tension is required. Suitability should be
evaluated according to joint design and vibration
conditions.
Material Grades
Stainless Steel Fastener Grades Available
| Grade |
Standard Reference |
Typical Application |
| 304 / 304L |
ASTM F593 / ISO 3506 |
General-purpose industrial & structural
fastening |
| 316 / 316L |
ASTM F593 / ISO 3506 |
Marine, chemical & chloride-containing
environments |
| 310 |
ASTM A193 |
Elevated-temperature furnace & heat-treatment
systems |
Stainless Steel 304 Fasteners
Stainless Steel 304 is one of the most widely used austenitic stainless steel
grades for general industrial fastening applications. It contains chromium and
nickel, providing good corrosion resistance in atmospheric and moderately
corrosive environments.
- ✓Good general corrosion
resistance
- ✓Good formability and
machinability
- ✓Suitable for indoor and
outdoor applications
- ✓Good toughness over a
broad temperature range
- ✓Widely available in
standard fastener forms
304 Stainless Steel Fasteners are commonly used in construction, food processing
equipment, general engineering, architectural assemblies, and industrial
machinery.
Stainless Steel 304L Fasteners
Stainless Steel 304L is the low-carbon version of Grade 304. Its reduced carbon
content improves resistance to sensitization and intergranular corrosion after
welding or exposure to elevated temperatures.
- ✓Good corrosion
resistance
- ✓Lower carbon content
than 304
- ✓Suitable for fabricated
and welded assemblies
- ✓Good mechanical
properties for general industrial
use
304L fasteners are used where corrosion resistance and compatibility with welded
stainless steel structures are important.
Stainless Steel 316 Fasteners
Stainless Steel 316 contains molybdenum, which improves resistance to pitting
and corrosion in chloride-containing environments compared with Grade 304.
- ✓Improved corrosion
resistance
- ✓Better resistance to
pitting in chloride environments
- ✓Suitable for marine and
coastal applications
- ✓Good resistance to many
industrial chemicals
- ✓Reliable performance in
process environments
316 Stainless Steel Fasteners are commonly used in chemical processing, marine
equipment, pharmaceutical plants, food processing, and coastal
installations.
Stainless Steel 316L Fasteners
Stainless Steel 316L is the low-carbon version of Grade 316. It combines
molybdenum-enhanced corrosion resistance with reduced carbon content.
- ✓Excellent general
corrosion resistance
- ✓Improved resistance to
sensitization
- ✓Good performance in
chloride-containing environments
- ✓Suitable for welded
structures and process equipment
316L fasteners are widely used in pharmaceutical, chemical, marine, and process
industries.
Stainless Steel 310 Fasteners
Stainless Steel 310 is a high chromium and nickel austenitic stainless steel
designed for elevated-temperature service.
- ✓Good resistance to
oxidation at elevated temperatures
- ✓High-temperature
strength
- ✓Good resistance to
thermal cycling
- ✓Suitable for furnace and
heat-processing equipment
310 stainless steel fasteners are used in furnaces, thermal processing plants,
high-temperature equipment, and heat-treatment systems.
Design Data
Property Classes, Standards & Specifications
Stainless Steel Fastener Property Classes
The mechanical strength of stainless steel fasteners is commonly identified
through property classes specified under relevant standards. The required
property class should be selected based on bolt loading, joint design,
temperature, corrosion conditions, and applicable engineering
requirements.
| Property Class |
Typical Application |
| A2-50 |
General-purpose corrosion-resistant fastening |
| A2-70 |
Higher-strength austenitic stainless steel
fasteners |
| A4-50 |
Improved corrosion resistance for more demanding
environments |
| A4-70 |
High-strength fasteners with molybdenum-enhanced
corrosion resistance |
| A4-80 |
Higher-strength applications requiring enhanced
corrosion resistance |
Standards & Specifications
As a professional Stainless Steel Fastener Stockist in India, Metal-Link
supplies products in accordance with applicable international and
project-specific standards.
| Standard |
Scope |
| ASTM A193 |
Alloy steel and stainless steel bolting for
high-temperature and high-pressure service |
| ASTM A194 |
Carbon and alloy steel nuts for bolting for
high-pressure or high-temperature service |
| ASTM F593 |
Stainless steel bolts, hex cap screws, and
studs |
| ASTM F594 |
Stainless steel nuts |
| ASTM A320 |
Alloy steel and stainless steel bolting for
low-temperature service |
| ISO 3506 |
Mechanical properties of corrosion-resistant
stainless steel fasteners |
| ASME B18.2.1 |
Square and hex bolts and screws |
| ASME B18.2.2 |
Square and hex nuts |
| DIN / ISO / EN / BS |
Alternative dimensional and material standards as
required |
Material Data
Manufacturing, Corrosion Resistance & Mechanical Performance
Manufacturing & Threading
The manufacturing method for a Stainless Steel Fastener depends on the product
type, diameter, grade, mechanical property requirement, and production
standard. Common manufacturing processes include:
- ✓Selection of certified
stainless steel raw material
- ✓Cold forging or hot
forging
- ✓Machining and head
formation
- ✓Thread rolling or thread
cutting
- ✓Solution annealing where
required
- ✓Cleaning and surface
finishing
- ✓Dimensional
inspection
- ✓Mechanical property
testing
- ✓Material identification and
marking
Thread rolling is commonly preferred for many fastener applications because it
forms the thread without cutting through the grain structure and can provide
good surface finish and fatigue performance.
Corrosion Resistance
The corrosion performance of a Stainless Steel Fastener depends on the selected
grade and the actual operating environment. Important factors include:
- ✓Chloride
concentration
- ✓Temperature
- ✓Moisture and
humidity
- ✓Chemical
exposure
- ✓Crevice
conditions
- ✓Surface
contamination
- ✓Galvanic interaction with
dissimilar metals
Grade 304 is suitable for many general-purpose environments, while Grade 316
and 316L are generally preferred where improved resistance to
chloride-induced pitting and corrosion is required. For highly aggressive
marine or chemical environments, duplex stainless steel, super duplex, or
nickel alloy fasteners may be more appropriate depending on the service
conditions.
Mechanical Properties & Performance
A properly selected Stainless Steel Fastener provides reliable joint strength
while offering resistance to atmospheric and chemical corrosion. Important
mechanical considerations include:
- ✓Tensile
strength
- ✓Yield or proof
strength
- ✓Elongation
- ✓Hardness
- ✓Fatigue
resistance
- ✓Thread
engagement
- ✓Torque and
preload
Fastener selection should not be based only on diameter or material grade. The
required preload, joint stiffness, temperature, corrosion conditions,
vibration, and safety requirements should also be considered.
Industry Use
Applications of Stainless Steel Fasteners
Stainless steel fasteners are used across a wide range of industries where
corrosion resistance and mechanical reliability are important.
- ✓Oil & Gas
Equipment:
Flange bolting,
equipment assembly, and structural connections in oil and gas
processing facilities.
- ✓Petrochemical
Plants:
Process equipment,
piping systems, and structural assemblies requiring
corrosion-resistant fastening.
- ✓Chemical
Processing:
Equipment and
piping connections in chemical plants handling corrosive process
fluids and chemicals.
- ✓Food Processing
Equipment:
Hygienic
equipment assemblies and process machinery using 304 and 316 grade
stainless steel fasteners.
- ✓Pharmaceutical
Plants:
Process equipment,
vessels, and piping assemblies requiring clean and
corrosion-resistant stainless steel fasteners.
- ✓Marine
Engineering:
Marine
equipment, offshore structures, and seawater systems using 316/316L
grade fasteners for chloride resistance.
- ✓Water Treatment
Systems:
Water treatment
equipment, pipelines, and process assemblies requiring
corrosion-resistant fastening components.
- ✓Desalination
Plants:
High-pressure and
seawater handling equipment requiring 316L or higher-grade
stainless steel fasteners.
- ✓Construction &
Infrastructure:
Structural
assemblies, cladding systems, and architectural installations using
304 grade stainless steel fasteners.
- ✓Power
Generation:
Equipment
assemblies and piping connections in power plants using suitable
grade stainless steel fasteners.
- ✓Pumps &
Valves:
Equipment bolting
and assembly connections in pumps, valves, and process
instrumentation systems.
- ✓Pressure Vessels &
Heat Exchangers:
Flanged
joint bolting and equipment assembly using stud bolts and hex nuts
in pressure vessel and heat exchanger
applications.
Certification
Testing, Inspection & Quality of Stainless Steel Fasteners
As a dependable Stainless Steel Fastener Supplier in India, Metal-Link Steel
& Alloys can supply products with testing and inspection according to the
applicable standard and project requirements. Available testing may
include:
- ✓Chemical composition
analysis
- ✓Tensile testing
- ✓Proof load
testing
- ✓Hardness testing
- ✓Positive Material
Identification (PMI)
- ✓Thread gauge
inspection
- ✓Dimensional
inspection
- ✓Visual examination
- ✓Surface finish
inspection
With an established presence since 1985 and ISO 9001:2015, ISO 14001:2015 and
ISO 45001:2018 certifications, Metal-Link supports consistent product quality.
Documentation may include Material Test Certificates, PMI reports, dimensional
inspection reports, mechanical test reports, and third-party inspection
certificates.
View
Certificate →
Pan-India Supply
Stainless Steel Fastener Supplier & Stockist Across India
Metal-Link Steel & Alloys supplies Stainless Steel Fasteners to EPC
contractors, engineering companies, process plants, fabricators, distributors
and industrial buyers across major Indian markets. As a Stainless Steel
Fastener Supplier in India, Metal-Link supports standard and project-specific
requirements based on grade, size, thread type, property class, and
quantity.
Cities We Supply
MumbaiPuneAhmedabadVadodaraSurat
DelhiGurugramNoidaChennaiBengaluru
HyderabadKolkataJaipurRajkotCoimbatore
VisakhapatnamNagpurIndore
Have Questions?
Frequently Asked Questions
What grades of stainless steel fasteners do you supply?
Metal-Link supplies Stainless Steel Fasteners in
grades 304, 304L, 316, 316L, and 310, subject to the required
specification and availability.
What is the difference between A2 and A4 stainless steel
fasteners?
A2 fasteners are manufactured from austenitic
stainless steel corresponding to Grade 304 or similar. A4 fasteners are
manufactured from molybdenum-containing austenitic stainless steel
corresponding to Grade 316, providing improved corrosion resistance in
chloride-containing and more aggressive environments. Both designations
are part of the ISO 3506 property class system.
What is the difference between 316 and 316L stainless steel
fasteners?
Both 316 and 316L are molybdenum-containing
austenitic stainless steels with similar corrosion resistance. 316L has a
lower carbon content, which reduces the risk of sensitization and
intergranular corrosion in welded structures. For most fastener
applications, the mechanical properties of 316L are suitable and the
lower carbon content is not a limiting factor.
What standards are used for stainless steel fasteners?
Common standards include ASTM A193 and ASTM A194
for alloy and stainless steel bolting for industrial pressure service,
ASTM F593 and ASTM F594 for stainless steel bolts and nuts, ISO 3506 for
property classes, and ASME B18.2.1 and B18.2.2 for dimensional
requirements. DIN, EN, and BS standards can also be referenced as
required.
Which stainless steel fastener grade should I select for marine
applications?
Grade 316 or 316L is commonly selected for marine
and coastal applications where chloride-induced pitting corrosion is a
concern. For more severe seawater or offshore environments, duplex
stainless steel or higher-performance alloy fasteners may be more
appropriate. Final grade selection should be based on the specific
chloride concentration, temperature, and exposure
conditions.
Can you supply material test certificates with stainless steel
fasteners?
Yes. Stainless Steel Fasteners can be supplied
with applicable Material Test Certificates (MTCs), chemical analysis,
mechanical test results, PMI reports, dimensional inspection reports, and
third-party inspection documentation as required by the project
specification.
Request a Quote
Request a Quote for Stainless Steel Fasteners
Looking for a Stainless Steel Fastener Stockist in India for your
industrial, marine, chemical, construction, or engineering
requirements? Contact Metal-Link Steel & Alloys with your
required fastener type, stainless steel grade, diameter, length,
thread type, property class, applicable standard, quantity, coating
or surface finish requirements, testing requirements and
documentation requirements for availability and project-specific
pricing.
