Alloy Steel Fasteners

Hexagon Bolt / Set Screws	Stud Bolt	Hexagon Nuts	Socket Cap screws
DIN 931	BS4882	DIN 934	DIN 912
DIN 933	DIN 976	BS 1768	DIN 6912
BS 1768		BS 1769	DIN 7984
UNI 5731		BS 1083	ANSI B18.3
UNI 5739		BS 3692	ISO 4762
ISO 4014		ISO 4032	UNI 5931
ISO 4017		ISO 4033	BS 2470
BS 1769		ANSI B18.2.2	BS 4168
BS 3692
ANSI B18.2.1

Socket & Slotted Set Screws	Socket & Slotted Countersunk Screws	Studs	Washers
DIN 913	DIN 963	DIN 938	DIN 125
DIN 914	DIN 7991	DIN 939	DIN 9021

Alloy Steel Grades Chart for Fasteners

Unifit Fastener offers many alloy steel fasteners. These fasteners are made to meet tough industry rules. This means they are reliable. They perform well in hard situations. Here is a list of common alloy steel fastener grades we offer:

Alloy Steel Grades	Description	Common Applications
AISI 4130 Fasteners	Low-alloy steel with chromium and molybdenum, known for excellent strength and toughness.	Aerospace, automotive, and structural applications requiring high strength and moderate corrosion resistance.
AISI 4140 Fasteners	Alloy steel contains chromium, molybdenum, and manganese, offering superior tensile strength and hardness.	Heavy machinery, oil & gas, automotive, and construction industries.
ASTM A193 Gr. B7	Heat-treated alloy steel fasteners with high strength and suitability for elevated temperature service.	Pressure vessels, boilers, and high-temperature industrial applications.
ASTM A193 Gr. B7M	Quenched and tempered version of B7 for improved toughness under stress.	High-pressure environments require enhanced toughness.
ASTM A193 Gr. L7	Alloy steel fasteners with higher toughness and ductility, designed for high-temperature use.	Power plants, chemical, and petrochemical industries.
ASTM A193 Gr. L7M	Quenched and tempered L7 grade, providing enhanced mechanical properties for critical uses.	Applications involving cyclic loading and stress corrosion.
ASTM A193 Gr. B16	Alloy steel fasteners designed for cryogenic and low-temperature service conditions.	Cryogenic equipment, LNG plants, and low-temperature industrial settings.
ASTM A320 Gr. L7	Low-temperature alloy steel fasteners with excellent toughness at sub-zero temperatures.	Refrigeration, LNG, and cold storage facilities.
ASTM A193 Gr. B8	Stainless steel fasteners made from austenitic stainless steel (usually 304 or 316), offering excellent corrosion resistance.	Chemical processing, marine environments, and food industry applications.

Steel Alloy Composition

Alloy steel fasteners get their better metal properties. They also get their durability. This comes from adding specific elements to basic carbon steel. These elements make the steel stronger. They make it tougher. They improve rust resistance and heat resistance. This process makes the steel right for tough industrial needs.

Below is a table that shows key elements in alloy steel fasteners. It also shows their usual amounts.

Alloying Element	Typical Percentage Range (%)	Primary Effect on Alloy Steel Properties
Chromium (Cr)	0.8 – 2.0	Increases hardness, tensile strength, corrosion & oxidation resistance
Nickel (Ni)	0.3 – 1.5	Enhances toughness, impact resistance, and corrosion resistance, especially at low temperatures
Molybdenum (Mo)	0.2 – 0.5	Improves strength, hardness, wear resistance, and high-temperature stability
Manganese (Mn)	0.5 – 1.0	Boosts hardenability, tensile strength, and toughness
Vanadium (V)	0.05 – 0.15	Refines grain size, increases strength and wear resistance
Silicon (Si)	0.2 – 0.5	Acts as deoxidizer, improves strength and magnetic properties

Exact composition varies by grade application requirements. Ensuring fasteners perform optimally under specific conditions.

Unifit Fastener meticulously controls alloy compositions. This is done to deliver fasteners with consistent quality, strength and reliability across wide range of industrial uses.

Uses of Alloy Steel Fasteners

Alloy steel fasteners are widely used across numerous industries due to superior strength, durability, and resistance to wear and corrosion. Addition of alloying elements like chromium nickel molybdenum make these fasteners withstand extreme conditions. These are ideal for critical applications.

Common Applications Include:

• Automotive and Transportation: Fasteners for engines chassis suspension systems. High strength fatigue resistance is essential.
• Oil & Gas Industry: Used in drilling rigs pipelines valves pressure vessels. Demand durability under high pressure and corrosive environments.
• Aerospace:Critical components fasteners requiring high strength to weight ratios. Resistance to extreme temperatures.
• Construction and Heavy Machinery: Fasteners in structural assemblies, machinery parts equipment. Exposed to heavy loads of vibrations.
• Power Generation: Fasteners for turbine boilers equipment. Operating at elevated temperatures high stress.
• Chemical and Petrochemical Plants:Fasteners resist corrosion and maintain mechanical integrity. In harsh chemical environments.
• Marine Applications:Fasteners exposed to saline humid environments. Corrosion resistance is crucial.

Alloy Steel Properties for Fasteners

Alloy steel fasteners prized for high strength, toughness and durability. Enhanced with elements like chromium, nickel and molybdenum, it offers superior wear corrosion resistance compared to carbon steel. These fasteners maintain excellent performance under high stress temperature. Ideal for demanding industrial uses. Alloy steels provide good machinability and dimensional stability that ensures reliable long lasting fastening solutions.

Alloy Steel Properties	Description
Tensile Strength	High resistance to breaking under tension
Toughness	Ability to absorb energy and resist impact
Wear Resistance	Durability against friction and abrasion
Corrosion Resistance	Resistance to rust and chemical degradation
Heat Resistance	Maintains strength and hardness at elevated temperatures
Machinability	Ease of cutting and shaping during manufacturing
Dimensional Stability	Retains size and shape under stress and heat

Alloy Steel Density for Fasteners

Alloy steel fasteners have typically density approximately 7.85 grams per cubic centimeter gcm3 or 7850 kilograms per cubic meter kgm3- density slightly higher than standard carbon steel. Due to alloying elements chromium nickel molybdenum.

Consistent density ensures uniform weight strength. Crucial for precise engineering applications. Weight to strength ratio impacts performance.

Unifit Fastener maintains strict quality control in order to deliver alloy steel fasteners with reliable density material integrity for all industrial needs.

Alloy Steel vs Stainless Steel vs Carbon Steel Fasteners

White choosing fasteners, understanding differences alloy steel vs stainless steel and alloy steel vs carbon steel is essential. Alloy steel fasteners offer a balanced combination of strength and durability. Moderate corrosion resistance. Ideal for demanding industrial applications.

In contrast stainless steel fasteners provide superior corrosion resistance due to high chromium content. Carbon steel fasteners are valued for cost effectiveness and general purpose use. Comparison highlights alloy steel properties differentiating these materials, helping select best fasteners for specific needs.

Feature	Alloy Steel	Stainless Steel	Carbon Steel
Composition	Contains alloying elements like chromium, nickel, molybdenum (moderate chromium)	Contains minimum 10.5% chromium for corrosion resistance	Iron with varying carbon content, minimal alloying
Corrosion Resistance	Moderate; may require coatings or treatments	Excellent; naturally corrosion and rust-resistant	Low; prone to rust without protective coating
Strength & Hardness	High tensile strength and hardness	Moderate strength, good toughness	Lower strength, suitable for general use
Heat Resistance	Retains strength and hardness at elevated temperatures	Good, but generally lower than alloy steel	Less suitable for high-temperature use
Cost	More cost-effective than stainless steel	Higher due to chromium and alloy content	Most cost-effective, widely used
Typical Applications	Automotive, construction, heavy machinery	Food processing, medical, marine, chemical industries	General-purpose fastening, less demanding applications

Trusted Alloy Steel Fasteners Manufacturer in India – Unifit Fastener

When you need top quality alloy steel fasteners in India, Unifit Fastener is a name you can trust. We are trusted in the industry. We have many years of experience. We are really committed to quality. We also have a large selection of industrial grade fasteners. Unifit is the main supplier for many clients in the oil and gas, building cars, petrochemicals and heavy engineering sectors.

We specialize in making and selling many alloy steel fasteners. These include bolts, nuts, washers, screws and studs. They are made from grades like 4130, 4140, ASTM, A193, B7B7M, L7L7M and others. Every product is made to meet global standards. These standards include ASTM, ASME, DIN and ISO. This ensures great performance even in very tough places.

Unifit Fastener uses precise manufacturing. We have strict quality control. We also offer good prices. This makes us a reliable partner for large orders. Also for custom needs and on time deliveries. This is true for India and other countries.

Fill the form below. Request a quick price quote from our team. We will reply with prices details and delivery times. This information will be specific to your needs.