+91 97734 41022 sales@exoticalloy.com
Precision Fastener Engineering

Industrial Screws & Threaded Fasteners

Precision-Engineered Screws in High Nickel Alloys, Stainless Steel, Titanium, Duplex & High-Tensile Steels

Size Range
M3 – M150 | 1/4" – 6"
Material Options
50+ Exotic & Superalloys
Certifications
EN 10204 3.1 / 3.2 | PMI
Global Supply
Worldwide Export Ready
100% INSPECTED L (Total Length) b (Thread Length) k d dk TECHNICAL BLUEPRINT Screw EXOTIC ALLOY
Optical micrometer & ultrasonic crack tested
High-Integrity Fasteners

Premier Manufacturer & Exporter of Industrial Screws

Exotic Alloy is a certified manufacturer and global distributor of premium high-tensile, corrosion-resistant, and high-temperature bolting components. We engineer custom and standard industrial bolts conforming strictly to ASTM, ASME, DIN, ISO, BS, and JIS specifications.

Whether requiring high-pressure subsea bolting in Inconel 625 / 718, sour-gas NACE MR0175 compliant bolting for petrochemical reactors, or lightweight high-strength fasteners in Titanium Grade 5, our state-of-the-art hot forging, CNC threading, and heat-treatment facilities deliver zero-defect reliability with complete traceability.

ASTM A193 / A320 / A325 CNC Rolled Threads (UN/Metric) NACE MR0175 / ISO 15156 Cryogenic & High-Temp Service Custom CAD/CAM Drawing Parts
Full Range Product Portfolio

Types of Screws We Manufacture

Explore our precision-machined and forged screw range available in standard metric (M3 - M150) and imperial (1/4" - 6") sizes.

Metallurgical Purity & Diversity

Available Material Grades for Screws

We forge and machine screws from certified billets and bars with 100% Positive Material Identification (PMI) and EN 10204 3.1 certification.

Low Carbon Steel
High Performance Fasteners

Excellent ductility and weldability for general-purpose structural bolting.

AISI 1005 AISI 1008 AISI 1010
Medium Carbon Steel
High Performance Fasteners

Balanced strength and toughness for automotive and machinery components.

AISI 1029 AISI 1030 AISI 1033
High Carbon Steel
High Performance Fasteners

High tensile strength and wear resistance for high-stress applications.

AISI 1055 AISI 1060 AISI 1070
Chromium
High Performance Fasteners

Enhanced hardness and wear resistance for high-load bearing bolts.

AISI 50100 AISI 5015 AISI 5046
Chrome Vanadium
High Performance Fasteners

Superior fatigue resistance and shock absorption for springs and fasteners.

AISI 6118 AISI 6120 AISI 6130
Molybdenum
High Performance Fasteners

Maintains high strength at elevated temperatures.

AISI 4012 AISI 4023 AISI 4024
Cr-Mo
High Performance Fasteners

High tensile strength and excellent ductility for pressure vessels.

AISI 4118 AISI 4130 AISI 4135
Ni-Cr-Mo
High Performance Fasteners

Ultimate toughness and deep hardenability for heavy-duty structural bolting.

AISI 4320 AISI 4330 AISI 4340
Ni-Mo
High Performance Fasteners

Good machinability and uniform case hardness.

AISI 4615 AISI 4617 AISI 4620
Nickel Chromium
High Performance Fasteners

Excellent low-temperature toughness and hardenability.

AISI 3312 AISI 3316 AISI 3120
Silicon Manganese Steel
High Performance Fasteners

High yield strength suitable for heavy-duty springs and fasteners.

AISI 9254 AISI 9255 AISI 9260
Tool Steel
High Performance Fasteners

Extreme hardness and abrasion resistance for specialized tooling fasteners.

A2 D2 H1
Austenitic Stainless Steel
High Performance Fasteners

Outstanding corrosion resistance and formability for marine and food industries.

AISI 301 AISI 302 AISI 304
Ferritic Stainless Steel
High Performance Fasteners

Good ductility and resistance to stress corrosion cracking.

AISI 404 AISI 405 AISI 409
Martensitic Stainless Steel
High Performance Fasteners

High strength and hardness with moderate corrosion resistance.

AISI 403 AISI 410 AISI 416
Precipitation Hardening
High Performance Fasteners

Ultra-high strength combined with excellent corrosion resistance.

UNS S10120 UNS S13800 UNS S17400
Duplex Stainless Steel
High Performance Fasteners

High yield strength and superior resistance to chloride stress corrosion cracking.

Alloy 2201 Alloy 2205 Alloy 2304
Super Duplex Steel
High Performance Fasteners

Exceptional pitting and crevice corrosion resistance for subsea environments.

UNS S32750 UNS S32760 Zeron 100
High Moly Stainless Steel
High Performance Fasteners

Maximum resistance to pitting in severe chloride environments.

AISI 904L AISI 926 Alloy 20
Inconel
High Performance Fasteners

Extreme temperature strength and oxidation resistance for aerospace and gas turbines.

Alloy 625 Alloy 718 Alloy 600
Monel
High Performance Fasteners

Superior resistance to rapidly flowing seawater and hydrofluoric acid.

Alloy 400 Alloy K500 Alloy R405
Hastelloy
High Performance Fasteners

Supreme resistance to localized corrosion and severe chemical environments.

Alloy C276 Alloy C22 Alloy B2
Incoloy
High Performance Fasteners

Excellent resistance to high-temperature oxidation and carburization.

Alloy 800 Alloy 825 Alloy 925
Nimonic
High Performance Fasteners

High-temperature low-creep superalloy for exhaust valves and turbine blades.

Alloy 75 Alloy 80A Alloy 90
Molybdenum
High Performance Fasteners

Refractory metal offering outstanding strength at extreme temperatures.

Alloy 360 Alloy 361 Alloy 363
Stellite
High Performance Fasteners

Cobalt-based alloy providing exceptional wear and galling resistance.

Alloy 3 Alloy 6 Alloy 12
Waspalloy
High Performance Fasteners

High-strength nickel-based superalloy for extreme aerospace applications.

UNS N07001 AMS 5706 AMS 5708
Maraging
High Performance Fasteners

Ultra-high strength, low carbon steel with excellent toughness.

Alloy 200 Alloy 250 Alloy 300
R Alloys
High Performance Fasteners

Specialized heat-resistant superalloys for highly stressed components.

Alloy 41 Alloy 80 Alloy 95
S Alloys
High Performance Fasteners

Corrosion and heat-resistant alloys for demanding chemical processing.

Alloy 25 Alloy 28 Alloy 31HT
I Alloys
High Performance Fasteners

Controlled expansion alloys for precision instrumentation.

Alloy 36 Alloy 42 Alloy 32-5
N Alloys
High Performance Fasteners

High magnetic permeability and controlled expansion characteristics.

Alloy 36 Alloy 42 Alloy 48
Titanium
High Performance Fasteners

Unmatched strength-to-weight ratio and saltwater corrosion immunity.

Grade 1 Grade 2 Grade 3
Titanium Alloys
High Performance Fasteners

Enhanced mechanical properties for critical aerospace fasteners.

Grade 5 Grade 9 Grade 23
Copper
High Performance Fasteners

Excellent electrical and thermal conductivity with good corrosion resistance.

UNS C11000 UNS C10100 UNS C12000
Tantalum
High Performance Fasteners

Virtually immune to chemical attack at temperatures below 150°C.

UNS R05200 UNS R05240 UNS R05252
Zirconium
High Performance Fasteners

Outstanding resistance to highly corrosive chemical processing environments.

UNS R60700 UNS R60702 UNS R60705
Aluminium
High Performance Fasteners

Lightweight and corrosion-resistant for aerospace and automotive bolting.

Alloy 6061 Alloy 7075 Alloy 2024
Nickel
High Performance Fasteners

High purity nickel offering excellent resistance to caustic alkalis.

Alloy 200 Alloy 201 Alloy 205
Chromium Copper
High Performance Fasteners

High electrical conductivity combined with high strength at elevated temperatures.

UNS C18200 C18150 C18200
Copper Nickel
High Performance Fasteners

Exceptional resistance to marine biofouling and seawater corrosion.

UNS C70600 UNS C71500 UNS C70620
Nickel Silver
High Performance Fasteners

Good spring properties and resistance to environmental tarnishing.

UNS C70600 UNS C71500 UNS C72900
Beryllium Copper
High Performance Fasteners

Highest strength of any copper alloy with non-sparking properties.

UNS C17200 UNS C17300 UNS C17500
Brass
High Performance Fasteners

Excellent machinability and aesthetic appeal for decorative and electrical fittings.

UNS C26000 UNS C27000 UNS C36000
Aluminium Bronze
High Performance Fasteners

High strength and excellent wear resistance for heavy-duty marine hardware.

UNS C61400 UNS C62300 UNS C95400
Nickel Aluminium Bronze
High Performance Fasteners

Superior corrosion resistance and toughness for naval applications.

UNS C63000 UNS C63200 UNS C95800
Silicon Aluminium Bronze
High Performance Fasteners

Excellent anti-galling properties and high load capacity.

UNS C63600 UNS C64200 UNS C95600
Phosphor Bronze
High Performance Fasteners

Superb spring qualities and high fatigue resistance.

UNS C51000 UNS C51900 UNS C52100
Silicon Bronze
High Performance Fasteners

Easy pourability and high strength for architectural and marine fasteners.

UNS C65100 UNS C65500 UNS C66100
Manganese Bronze
High Performance Fasteners

High strength and good wear resistance for heavy load bearings.

UNS C67000 UNS C67500 UNS C86300
Tin Bronze
High Performance Fasteners

Excellent friction reduction and load bearing capacity for machinery.

UNS C90300 UNS C90500 UNS C93200
Engineering Utility Tool

Interactive Screw Weight & Dimensions Calculator

Select your screw geometry, material grade density, diameter, and length to calculate exact unit weight, total batch weight, and volume for shipping & engineering estimation.

Configure Bolt Parameters

Formulas comply with DIN/ISO head geometry standards.
Calculation Summary
0.162
kg / piece
(0.357 lbs)
16.20
Total kg
(35.71 lbs)
Configured Spec: M16 x 80mm Hex Bolt
Total Quantity: 100 Pieces
Selected Material: SS 304 / 316
Extended Corrosion Life

Bolt Surface Coatings & Platings

Advanced protective coatings applied to prevent galling, lower friction coefficient, and provide up to 3,000+ hours salt spray test endurance.

PTFE / Xylan® Fluoropolymer Coating
Blue, Green, Yellow, Black (ASTM D3359)

Low friction coefficient (0.05-0.08), eliminating thread galling and resisting subsea saltwater immersion.

Hot-Dip Galvanizing (HDG)
ASTM A153 / ISO 10684 (Over 50 µm)

Thick sacrificial zinc metallurgical alloy layer for decades of outdoor civil and utility structure protection.

Zinc Electroplating & Passivation
Clear, Yellow Trivalent (ASTM B633)

Uniform micro-layer plating providing smooth thread engagement for standard industrial and machine fasteners.

Zinc-Nickel (Zn-Ni) Alloy Plating
12-15% Ni Content (ASTM B841)

Automotive & defense grade non-toxic coating resisting over 1,500 hours salt spray with zero red rust.

Geomet® / Dacromet® Flake
Non-Electrolytic Zinc Flake

100% free of hydrogen embrittlement risk; essential for Class 10.9 & 12.9 ultra-high tensile bolts.

Cadmium Plating with Chromate
QQ-P-416 Type II (Aviation Standard)

Provides high lubricity, galvanic compatibility with aluminium, and marine resistance for military aircraft.

Zero-Defect Quality Management

Manufacturing & Testing Assurance

Every batch of bolts produced by Exotic Alloy undergoes rigorous multi-stage metallurgical, dimensional, and mechanical verification.

1
Raw Material PMI

100% Optical Emission Spectrometry & XRF PMI on all incoming bars and forging ingots to ensure exact chemical compliance.

2
Hot Forging & Threading

Temperature-controlled induction hot forging followed by continuous CNC thread rolling for maximum fatigue grain flow.

3
Solution Heat Treatment

Calibrated quench and temper, solution annealing, and age-hardening cycles in atmosphere-controlled furnaces.

4
Certification & Dispatch

EN 10204 Type 3.1 & 3.2 Inspection Certificates (TUV, DNV, Lloyd's) including full tensile, proof load, and Charpy reports.

In-House Testing Lab

Our laboratory is equipped to conduct international specification testing without outsourcing delay.

Tensile & Proof Load Test (ASTM E8)
Charpy V-Notch (-196°C to +20°C)
Rockwell, Brinell & Vickers Hardness
Microstructure & Grain Size (ASTM E112)
Ultrasonic (UT) & Magnetic Particle (MPI)
Intergranular Corrosion (ASTM A262)
Field-Proven Reliability

Where Our Bolts Perform

Subsea & Offshore Oil & Gas

High-pressure Christmas trees, wellhead flanges, BOP stacks, and subsea pipelines requiring NACE MR0175 compliance.

Aerospace & Defense

Jet engine turbine mounts, landing gear assemblies, and missile housings engineered in Inconel 718 and Titanium.

Nuclear & Thermal Power

Steam turbine casing studs, heat exchanger tube-sheet bolting, and reactor vessel containment bolting.

Chemical & Petrochemical

Acid distillation columns, chlorination reactors, and polymer autoclaves requiring Hastelloy and Duplex 2205.

Marine & Desalination

Seawater intake pump bolting, reverse osmosis pressure tubes, and naval ship rudder propulsion systems.

Wind Turbines & Renewables

High-fatigue Class 10.9 & 12.9 tower flange foundation bolts, yaw ring bolting, and rotor blade studs.

Expert Guidance

Frequently Asked Questions

Heavy Hex Bolts (governed by ASME B18.2.1) feature a larger width across flats (AF) and slightly thicker head compared to standard hex bolts (DIN 933 / ASME B18.2.1 Standard). This larger head diameter distributes clamping loads across a greater surface area, preventing flange indentation in high-pressure piping (ASTM A193 B7/B8) and structural steel connections.

Yes. Over 40% of our production consists of custom CNC-machined and hot-forged bolts built precisely to client CAD/CAM drawings, special non-standard thread pitches (e.g. ACME, Trapezoidal, Extra-Fine), extended lengths up to 6 meters, and custom shank diameters in exotic superalloys.

Every delivery is accompanied by an EN 10204 Type 3.1 Mill Test Certificate providing full heat number traceability, spectro chemical analysis, tensile strength, yield strength, elongation, reduction of area, Charpy V-notch impact values, hardness test results, and dimensional verification. Third-party inspection (EN 10204 3.2 by TUV, DNV, Lloyd's, BV, or SGS) is readily provided upon request.

For subsea and marine splash zones, Super Duplex UNS S32750 / 2507 (PREN > 42), Inconel 625, and Titanium Grade 5 provide superior immunity against pitting and crevice corrosion compared to SS 316. Inconel 625 is the gold standard for subsea Christmas trees and riser bolting where cathodic protection systems are active.

We maintain an extensive ready stock of standard sizes in ASTM A193 B7, B8, B8M, SS 304, and SS 316 for same-day or 48-hour global dispatch. Custom hot-forged superalloy bolts (Inconel, Hastelloy, Monel, Duplex) typically carry a rapid manufacturing lead time of 7 to 15 business days with flexible MOQs suitable for maintenance shutdowns and OEM projects alike.
Get Rapid Pricing & Availability

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