Hex Head Screws
8946 Products
High-Strength Grade 8Steel Hex Head Screws
High-strength Grade 8 steel hex head screws are designed for applications requiring superior tensile strength and durability, making them ideal for heavy-duty fastening needs in industrial and structural settings.
High-Strength Metric Class10.9 Steel Hex Head Screws
High-strength metric Class 10.9 steel hex head screws are engineered for demanding applications where high load-bearing capacity and resilience are critical, offering enhanced performance and durability in mechanical and structural uses.
High-Strength Steel Hex HeadScrews with Material Certification
High-strength steel hex head screws with material certification ensure compliance with specific quality and performance standards, providing documented proof of material properties and suitability for critical applications requiring verified reliability and durability.
High-Strength Steel Hex HeadScrews with Phillips Drive
High-strength steel hex head screws with Phillips drive offer enhanced torque application and secure fastening while combining the strength of hex head screws with the convenience and compatibility of Phillips drive for a versatile and reliable fastening solution.
Mil. Spec. High-StrengthSteel Hex Head Screws
Military Specification (Mil. Spec.) high-strength steel hex head screws are designed to meet stringent military standards, offering exceptional durability, reliability, and performance for demanding applications. They provide robust fastening solutions with precise specifications to ensure high strength and resistance in critical environments.
Left-Hand Threaded High-StrengthSteel Hex Head Screws
Left-hand threaded high-strength steel hex head screws are designed for applications where reverse threading is needed to prevent loosening under vibration or torque, offering high strength and durability for demanding environments.
Medium-Strength Grade5 Steel Hex Head Screws
Medium-strength Grade 5 steel hex head screws provide a reliable balance of strength and ductility, suitable for a wide range of general applications where moderate strength and durability are required.
Medium-Strength Metric Class8.8 Steel Hex Head Screws
Medium-strength Metric Class 8.8 steel hex head screws offer a solid combination of tensile strength and toughness, making them ideal for applications requiring a balance of strength and performance.
Mil. Spec. Medium-StrengthSteel Hex Head Screws
Mil. Spec. medium-strength steel hex head screws meet military specifications for quality and durability, ensuring reliable performance in demanding applications.
Army-Navy Medium-StrengthSteel Hex Head Screws
Army-Navy medium-strength steel hex head screws adhere to specific military standards, providing dependable performance and durability for various applications.
JIS Medium-StrengthSteel Hex Head Screws
JIS medium-strength steel hex head screws comply with Japanese Industrial Standards, offering reliable performance and durability in applications that require adherence to JIS specifications.
Left-Hand Threaded Medium-StrengthMetric Class 8.8 Steel Hex Head Screws
Left-hand threaded medium-strength metric Class 8.8 steel hex head screws are designed to provide secure fastening in applications where left-hand threads are required, meeting the durability and performance standards of Class 8.8 steel.
Left-Hand Threaded Medium-StrengthGrade 5 Steel Hex Head Screws
Left-hand threaded medium-strength Grade 5 steel hex head screws offer reliable fastening in applications requiring left-hand threads, providing a balance of strength and durability consistent with Grade 5 steel specifications.
Low-Strength Steel Hex Head Screws
Low-strength steel hex head screws are designed for applications where high tensile strength is not required, offering cost-effective and reliable fastening with a lower strength rating.
Extreme-Strength Grade9 Steel Hex Head Screws
Extreme-strength Grade 9 steel hex head screws provide superior durability and resistance to high-stress applications, designed for heavy-duty environments where exceptional strength is critical.
Extreme-Strength Metric Class12.9 Steel Hex Head Screws
Extreme-strength Metric Class 12.9 steel hex head screws offer unparalleled tensile strength and load-bearing capacity, making them ideal for demanding applications requiring maximum performance and reliability.
18-8 Stainless Steel Hex Head Screws
18-8 stainless steel hex head screws provide excellent corrosion resistance, strength, and durability, making them suitable for a wide range of applications in both indoor and outdoor environments.
Mil. Spec. 18-8 StainlessSteel Hex Head Screws
Mil. Spec. 18-8 stainless steel hex head screws are manufactured to meet military specifications, ensuring high performance, reliability, and durability in demanding environments. They offer excellent corrosion resistance and strength.
Left-Hand Threaded 18-8Stainless Steel Hex Head Screws
Left-hand threaded 18-8 stainless steel hex head screws are designed for applications where reverse rotation is required. They offer excellent corrosion resistance, high strength, and durability, suitable for various industrial and structural uses.
Super-Corrosion-Resistant 316Stainless Steel Hex Head Screws
Super-corrosion-resistant 316 stainless steel hex head screws are ideal for highly corrosive environments. They provide exceptional resistance to rust and corrosion, making them suitable for marine, chemical, and other harsh conditions. Their high tensile strength ensures reliable performance in demanding applications.
Super-Corrosion-Resistant High-StrengthBumax 88 Hex Head Screws
Super-corrosion-resistant High-Strength Bumax 88 hex head screws offer superior resistance to corrosion and wear, especially in aggressive environments. Made from Bumax 88, a high-strength stainless steel alloy, these screws are designed to provide exceptional mechanical strength and durability, ensuring reliability in critical applications where standard materials might fail.
High-Strength 17-4 PH StainlessSteel Hex Head Screws
High-strength 17-4 PH stainless steel hex head screws are known for their excellent mechanical properties, including high tensile strength and resistance to corrosion. The 17-4 PH alloy, also known as 17-4 precipitation hardening stainless steel, is heat-treated to achieve superior hardness and strength, making these screws suitable for demanding applications where durability and reliability are crucial.
Stainless Steel Hex Screwand Nut Kits for Pipe Flanges
These kits are ideal for use in various industries, including oil and gas, chemical processing, and water treatment, where reliable and durable connections are essential.
Plastic Hex Head Screws
Plastic hex head screws are fasteners made from plastic materials, often used in applications where metal screws are not suitable due to environmental conditions or where weight reduction is necessary.
Brass Hex Head Screws
Brass hex head screws offer good corrosion resistance, durability, and an attractive appearance, making them suitable for a range of applications where both strength and aesthetics are important.
Aluminum Hex Head Screws
Aluminum hex head screws are lightweight, resistant to corrosion, and ideal for applications where reducing weight is crucial while maintaining a good balance of strength and durability.
Titanium Hex Head Screws
Titanium hex head screws offer exceptional strength-to-weight ratio, excellent corrosion resistance, and durability, making them suitable for high-performance and extreme environment applications.
Bronze Hex Head Screws
Bronze hex head screws are known for their excellent corrosion resistance, especially in marine environments, and their durability and strength, making them ideal for applications exposed to moisture and harsh conditions.
Ceramic Hex Head Screws
Bronze hex head screws are known for their excellent corrosion resistance, especially in marine environments, and their durability and strength, making them ideal for applications exposed to moisture and harsh conditions.
Fiberglass Hex Head Screws
Fiberglass hex head screws are lightweight and resistant to corrosion, making them suitable for applications in environments where metal screws may corrode or where reduced weight is advantageous.
Nickel Alloy Hex Head Screws
Nickel alloy hex head screws offer excellent resistance to corrosion, high temperatures, and oxidation, making them ideal for use in harsh environments and demanding applications.
Medium-Strength Steel Heavy HexHead Screws for Structural Applications
Medium-strength steel heavy hex head screws for structural applications are designed to provide enhanced load-bearing capabilities and durability, making them suitable for critical structural connections in construction and heavy-duty assemblies.
Metric High-Strength Steel Heavy HexHead Screws for Structural Applications
Metric high-strength steel heavy hex head screws for structural applications are engineered for superior load-bearing and durability, ensuring reliable performance in demanding structural connections and heavy-duty assemblies.
High-Strength Steel Heavy Hex HeadScrews for Structural Applications
High-strength steel heavy hex head screws for structural applications provide robust load support and durability, making them ideal for heavy-duty and high-stress environments.
18-8 Stainless Steel Heavy Hex HeadScrews for High-Pressure Applications
18-8 stainless steel heavy hex head screws for high-pressure applications offer excellent strength, corrosion resistance, and reliability, making them suitable for demanding environments.
Super-Corrosion-Resistant 316Stainless Steel Heavy Hex Head Screws for High-Pressure Applications
Super-corrosion-resistant 316 stainless steel heavy hex head screws for high-pressure applications provide exceptional strength, durability, and resistance to harsh environments, ensuring reliability and longevity.
Steel Heavy Hex Head Screwsfor High-Pressure Applications
Steel heavy hex head screws for high-pressure applications offer robust strength and durability, designed to withstand significant mechanical stress and harsh conditions.
High-Strength Grade 8 SteelFlanged Hex Head Screws
High-strength Grade 8 steel flanged hex head screws provide superior load-bearing capacity and resistance to deformation, making them ideal for demanding applications requiring enhanced strength and stability.
High-Strength Metric Class 10.9Steel Flanged Hex Head Screws
High-strength Metric Class 10.9 steel flanged hex head screws offer exceptional tensile strength and durability, designed for applications requiring robust performance and reliability under heavy loads.
JIS High-Strength SteelFlanged Hex Head Screws
JIS high-strength steel flanged hex head screws are engineered to meet Japanese Industrial Standards, providing superior strength and stability for demanding applications.
Medium-Strength Metric Class 8.8Steel Flanged Hex Head Screws
Medium-strength Metric Class 8.8 steel flanged hex head screws offer a reliable balance of strength and durability, suitable for various structural and mechanical applications.
Medium-Strength Grade 5 SteelFlanged Hex Head Screws
Medium-strength Grade 5 steel flanged hex head screws provide a good mix of strength and versatility for general-purpose use, including automotive and machinery applications.
Extreme-Strength SteelFlanged Hex Head Screws
Extreme-strength steel flanged hex head screws are designed to withstand the highest levels of stress and strain, making them suitable for demanding applications where maximum load-bearing capacity is required.
Stainless Steel Flanged Hex Head Screws
Stainless steel flanged hex head screws offer excellent corrosion resistance and are ideal for use in harsh environments, providing a strong and reliable fastening solution.
Stainless Steel Flanged HexHead Screws with Slotted Drive
Stainless steel flanged hex head screws with slotted drive combine the corrosion resistance of stainless steel with the convenience of a slotted drive, making them suitable for both high-performance and standard fastening applications.
Extreme-Strength StainlessSteel Flanged Hex Head Screws
Extreme-strength stainless steel flanged hex head screws offer superior durability and resistance to high stress and harsh conditions, making them ideal for demanding applications where high tensile strength and corrosion resistance are critical.
Fiberglass Flanged Hex Head Screws
Fiberglass flanged hex head screws provide strong, corrosion-resistant fastening solutions for applications requiring non-metallic components, offering lightweight durability and resistance to harsh environments.
Medium-Strength Grade 5 SteelSerrated-Flange Hex Head Screws
Medium-strength Grade 5 steel serrated-flange hex head screws combine reliable strength with a serrated flange to prevent loosening, ideal for applications requiring both secure fastening and resistance to vibration.
Medium-Strength Metric Class 8.8 SteelSerrated-Flange Hex Head Screws
Medium-strength Metric Class 8.8 steel serrated-flange hex head screws offer robust performance with enhanced resistance to loosening due to their serrated flange, suitable for applications requiring secure and stable fastening.
High-Strength Metric SteelSerrated-Flange Hex Head Screws
High-strength Metric steel serrated-flange hex head screws provide superior clamping force and resistance to loosening, ideal for heavy-duty applications requiring a secure and stable connection.
High-Strength Grade 8 SteelSerrated-Flange Hex Head Screws
High-strength Grade 8 steel serrated-flange hex head screws offer exceptional strength and grip, making them suitable for demanding applications where high clamping force and resistance to loosening are essential.
18-8 Stainless SteelSerrated-Flange Hex Head Screws
18-8 stainless steel serrated-flange hex head screws combine corrosion resistance with a serrated flange design for improved grip and vibration resistance, ideal for applications requiring durability and secure fastening in harsh environments.
Super-Corrosion-Resistant 316 StainlessSteel Serrated-Flange Hex Head Screws
Super-corrosion-resistant 316 stainless steel serrated-flange hex head screws offer exceptional durability and protection against extreme environments, providing a secure grip and resistance to rust and corrosion for demanding applications.
Extra-Wide Serrated-FlangeHex Head Screws
Extra-wide serrated-flange hex head screws are designed to provide enhanced grip and load distribution, offering stability and resistance to loosening in high-stress or dynamic environments.
Steel Wire-Lockable Hex Head Screws
Steel wire-lockable hex head screws feature a wire-locking mechanism that enhances security by preventing unintentional loosening, making them suitable for high-vibration or critical applications.
Stainless Steel Wire-LockableHex Head Screws
Stainless steel wire-lockable hex head screws are designed for high-corrosion-resistance and feature a wire-locking mechanism to prevent loosening in high-vibration or critical applications.
Cotter Pin-Lockable Hex Head Screws
Cotter pin-lockable hex head screws incorporate a cotter pin mechanism to securely lock the screw in place, providing additional resistance against loosening and ensuring reliability in high-vibration environments.
High-Strength Grade 8 SteelThread-Locking Hex Head Screws
High-strength Grade 8 steel thread-locking hex head screws are designed to provide exceptional resistance to loosening and vibration while maintaining high load-bearing capacity and durability.
Medium-Strength Metric Class 8.8 SteelThread-Locking Hex Head Screws
Medium-strength Metric Class 8.8 steel thread-locking hex head screws offer reliable fastening with good resistance to vibration and loosening, combined with a moderate load-bearing capacity.
Stainless Steel Thread-LockingHex Head Screws
Stainless steel thread-locking hex head screws provide excellent resistance to corrosion and vibration, ensuring secure fastening in demanding environments.
Hex Head Screws with Lock Washer
Hex head screws with lock washers are designed to prevent loosening under vibration or dynamic loads, enhancing the security and stability of the fastening.
Hex Head Screws with Flat Washer
Hex head screws with flat washers distribute the load evenly and provide a smooth surface for the screw head, which helps to prevent damage to the material being fastened and ensures a secure connection.
Sealing Hex Head Screws
Sealing hex head screws are designed to create a tight seal in applications where preventing leakage is crucial, often incorporating features like gaskets or sealing elements to ensure a secure, leak-proof fit.
Sanitary Hex Head Screws
Sanitary hex head screws are specifically designed for applications requiring high levels of cleanliness and hygiene, often used in food processing, pharmaceuticals, and medical equipment where they are made from materials that resist contamination and are easy to clean.
Vented Hex Head Screws
Vented hex head screws feature a design that includes small holes or channels to allow for air or gas to escape, reducing pressure buildup and preventing the formation of vacuum seals. This design is useful in applications where pressure or gas could affect the performance of the screw or the surrounding components.
Tension-Indicating Hex Head Screws
Tension-indicating hex head screws are designed with a built-in feature or coating that changes color or provides a visual indication when the screw reaches a specific tension level. This helps ensure proper preload and torque in critical applications, providing a visual confirmation that the desired tension has been achieved.
LILY Bearing stocks 8,946 hex head screws across steel strength grades, corrosion-resistant and specialty materials, heavy hex, flanged, and serrated-flange styles, plus anti-loosening and application-specific variants. Use the filters below, or the comparison tables, to narrow down by grade, material, thread size, and length.
Compare Steel by Strength Grade
| Grade | Best For | Watch Out For |
|---|---|---|
| Low-Strength Steel | Cost-effective, general-purpose fastening where high tensile strength isn't required | Not for structural or high-load joints |
| Medium-Strength (Grade 5 / Class 8.8) | The standard grade for general machinery and equipment | Grade 5 is the inch (SAE) designation; Class 8.8 is the metric equivalent |
| High-Strength (Grade 8 / Class 10.9) | Demanding applications requiring superior load-bearing capacity | Grade 8 is the inch designation; Class 10.9 is the metric equivalent |
| Extreme-Strength (Grade 9 / Class 12.9) | Heavy-duty, high-stress environments needing maximum load capacity | Highest strength tier available — confirm your application truly needs it |
Most grades are also available as JIS, Army-Navy, or Mil. Spec. standard variants, as well as left-hand threaded versions for counter-rotating assemblies.
Compare Corrosion-Resistant & Specialty Materials
| Material | Best For |
|---|---|
| 18-8 Stainless Steel | General corrosion resistance for a wide range of applications |
| 316 Stainless Steel | Highly corrosive environments, including marine and chemical exposure |
| 17-4 PH Stainless Steel | Applications needing both high tensile strength and corrosion resistance |
| Bumax 88 | Super-corrosion-resistant, high-strength fastening in aggressive, wear-prone environments |
| Brass | Good corrosion resistance with an attractive, decorative appearance |
| Bronze | Marine environments needing corrosion resistance and durability |
| Titanium | High-performance applications needing an excellent strength-to-weight ratio |
| Aluminum | Lightweight applications where reducing weight is a priority |
| Plastic | Environments where metal screws aren't suitable |
| Ceramic | Corrosion-resistant fastening, especially in marine settings |
| Fiberglass | Lightweight, corrosion-resistant fastening where metal screws may corrode or conduct electricity |
| Nickel Alloy | Resistance to corrosion, high temperatures, and oxidation in harsh environments |
Heavy Hex: Structural vs. High-Pressure
Heavy hex screws use a larger hex head for greater wrenching surface and load distribution, and come in two application-specific lines. Structural Applications screws (available in Medium-Strength, High-Strength, and metric versions) are designed for structural load-bearing and durability. High-Pressure Applications screws (available in Steel, 18-8, and 316 Stainless Steel) are built for pipe flanges and pressure-vessel joints. A ready-made stainless steel hex screw and nut kit for pipe flanges is also available.
Flanged vs. Serrated-Flange
Flanged hex head screws have a smooth, built-in washer-like flange under the head that spreads the load and eliminates the need for a separate washer. Serrated-flange screws add teeth to the underside of that flange to bite into the mating surface and resist loosening under vibration. Both styles are available across Grade 5, Class 8.8, Grade 8, Class 10.9, 18-8 and 316 stainless steel, and fiberglass.
Anti-Loosening & Anti-Tamper Features
| Feature | How It Works |
|---|---|
| Thread-Locking | A patch or coating on the threads resists vibration and loosening after installation |
| Wire-Lockable | A drilled hole in the head lets you thread safety wire between screws to physically prevent them from turning loose |
| Cotter Pin-Lockable | A cross-drilled hole accepts a cotter pin to mechanically lock the screw in place |
Application-Specific Variants
Beyond the standard hex head, LILY Bearing stocks several purpose-built variants: sealing screws for leak-tight joints, sanitary screws for food-processing and cleanroom hygiene requirements, vented screws with small channels to let air or gas escape, and tension-indicating screws with a visual feature that shows when proper torque has been reached. Screws are also available with a flat washer or lock washer pre-assembled, with a Phillips drive instead of a wrench-only head, or with material certification documenting compliance with specific quality standards.
Need a Custom Hex Head Screw?
Don't see the grade, material, or feature you need? Our team can cross-reference an existing part or quote a custom configuration. Request a Quote or Contact Us. LILY Bearing also offers customized fastener services.
Frequently Asked Questions
What is the difference between a flanged and a serrated-flange hex head screw?
A flanged hex head screw has a smooth, built-in washer-like flange under the head, which spreads clamping force and eliminates the need for a separate washer. A serrated-flange screw has the same flange with teeth added underneath it, which bite into the mating surface to resist loosening under vibration — use it wherever a flanged screw might back out over time.
When should I use a heavy hex screw instead of a standard hex head screw?
Heavy hex screws have a larger head for a bigger wrenching surface and better load distribution. Choose the structural version for load-bearing steel connections, or the high-pressure version for pipe flanges and pressure-vessel joints where the added bearing surface and strength are needed to maintain a reliable seal under pressure.
