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Standard Hex Head Cap Screws

Available10,728 products

Hex head cap screws are common threaded fasteners with hexagonal heads, which are six-sided tops without indentations. These screws allow for greater torque than traditional circular screws and are installed or removed with socket wrenches. They do not require a nut for fastening and come in a variety of materials and finishes, such as black oxide, zinc plated, zinc yellow, armor coated, hot dipped galvanized, and chrome coated. Coated screws have varying degrees of corrosion resistance based on the type of environment in which they are installed. Hex head cap screws are designed to secure objects within or against other objects for a non-loosening hold. These screws may be fully or partially threaded. Fully threaded screws match up with a threaded hole all the way to their heads for gripping and anchoring thin surfaces. Partially threaded screws are tougher and have an unthreaded area under their head to allow for more holding strength when force is applied from the side.

Low Strength Steel Hex Head Cap Screws

Low Strength Steel Hex Head Cap Screws
Low strength hex cap screws are made from standard hardware-grade steel. Low strength screws can be used on metal or wood. They are a low-cost fastener for use in light-duty applications where the screw is not subject to extreme temperatures or stress. They come in a black oxide finish or may be zinc plated or hot-dipped galvanized for corrosion resistance. Black oxide screws are corrosion resistant in dry environments and zinc yellow screws resist corrosion in wet environments. Zinc plating helps provide durability in wet environments. Hot-dipped galvanized steel screws are more corrosion resistant than zinc-plated screws and have a thicker coating than other finishes.

Plain

1/4"-20 Coarse

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5/16"-18 Coarse

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3/8"-16 Coarse

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7/16"-14 Coarse

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1/2"-13 Coarse

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5/8"-11 Coarse

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3/4"-10 Coarse

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Black Oxide

7/16"-14 Coarse

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Zinc Plated

1/4"-28 Fine

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1/4"-20 Coarse

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5/16"-18 Coarse

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3/8"-16 Coarse

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7/16"-14 Coarse

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1/2"-13 Coarse

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5/8"-11 Coarse

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3/4"-10 Coarse

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7/8"-9 Coarse

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1"-8 Coarse

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Hot Dipped Galvanized

1/4"-20 Coarse

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3/8"-16 Coarse

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1/2"-13 Coarse

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5/8"-11 Coarse

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Grade 5 Steel Hex Head Cap Screws

Grade 5 Steel Hex Head Cap Screws

Commonly used Grade 5 hex cap screws are heavier duty than Grade 2 steel options and are made from medium carbon steel and heat-treated. Grade 5 steel has 120,000 psi tensile strength and meets ASME B18.2.1 dimensional standards and SAE J429 material quality standards. These screws may be used in medium-duty applications. They come in a black oxide finish or may be zinc plated or chrome plated. Zinc plating helps provide durability in wet environments. Chrome plating increases the hardness, durability, and corrosion resistance of screws.

*Grainger’s product supplier has certified that products marked “Made in USA” below comply with "Made in USA" requirements in accordance with FTC rules and guidance

Grade 8 Steel Hex Head Cap Screws

Grade 8 Steel Hex Head Cap Screws

High-tensile Grade 8 hex cap screws are stronger than grades 2 or 5 steel. These screws hold fast in high-stress areas. Grade 8 steel has 150,000 psi tensile strength and meets ASME B18.2.1 dimensional standards and SAE J429 material quality standards. They come in a zinc yellow, or black oxide finish, or may be armor-plated for corrosion resistance. Black oxide screws work well in dry environments and armor-plated screws resist salt water and acids.

*Grainger’s product supplier has certified that products marked “Made in USA” below comply with "Made in USA" requirements in accordance with FTC rules and guidance

Grade 9 Steel Hex Head Cap Screws

Grade 9 Steel Hex Head Cap Screws

Grade 9 steel construction allows these hex head cap screws to have higher tensile strength and higher yield strength than Grade 8 steel. The Grade 9 screws maintain the highest clamp force available in a standard screw assembly and are used in the harshest environments including chemical applications. They come in a zinc yellow finish for corrosion resistance in wet environments.

Class 8.8 Steel Hex Head Cap Screws

Class 8.8 Steel Hex Head Cap Screws
Steel Class 8.8 hex cap screws are medium-duty, common fasteners used for joining manufacturing parts, repair parts, and construction materials. These screws are high tensile, quenched, and tempered. They are hard, yet malleable, allowing them to withstand sheer force. These screws come in a black oxide, zinc-plated or zinc yellow finish, or may be hot-dipped galvanized for stronger corrosion resistance. Black oxide screws are corrosion resistant in dry environments. Zinc plating and zinc yellow coatings help provide durability in wet environments. Hot-dipped galvanized steel screws are more corrosion resistant than zinc plated screws and have a thicker coating than other finishes.

Class 10.9 Steel Hex Head Cap Screws

Class 10.9 Steel Hex Head Cap Screws
These Class 10.9 hex head cap screws are heat-treated carbon and boron fasteners used in heavy-duty applications like joining automotive suspensions, attaching plumbing valves, and bolting forged iron pieces together. These screws are sold in black oxide, blue phosphate and zinc yellow finishes and have high-tensile strength and wear resistance for long-term durability. Black oxide screws are corrosion resistant in dry environments and zinc yellow screws resist corrosion in wet environments. Blue phosphate-dyed screws help distinguish metric screws from standard fractional fasteners.

18-8 Stainless Steel Hex Head Cap Screws

18-8 Stainless Steel Hex Head Cap Screws
Made from 18-8 stainless steel, these screws come in a plain finish or NL-19 corrosion-resistant finish. NL-19 finishes are proprietary treatments that modify the surface of stainless steel fasteners, making them brighter, stronger and more corrosion-resistant than plain stainless steel. These screws are designed to secure heavy-duty objects within or against other objects in harsh environments. They are chemical resistant and magnetic.

316 Stainless Steel Hex Head Cap Screws

316 Stainless Steel Hex Head Cap Screws
Made from 316 stainless steel, these screws come in a plain finish or NL-19 corrosion-resistant finish. NL-19 finishes are proprietary treatments that modify the surface of stainless steel fasteners, making them brighter, stronger, and more corrosion-resistant than plain stainless steel. These 316 stainless steel hex screws are more chemically resistant than 18-8 stainless steel and are designed for chemical and marine environments to secure heavy-duty objects within or against other objects.

A2 Stainless Steel Hex Head Cap Screws

A2 Stainless Steel Hex Head Cap Screws
Made from Metric Grade A2 stainless steel, these screws come in a plain finish or NL-19 corrosion-resistant finish. NL-19 finishes are proprietary treatments that modify the surface of stainless steel fasteners, making them brighter, stronger and more corrosion-resistant than plain stainless steel. Grade A2 hex screws are magnetic and are used to secure heavy-duty objects within or against other objects. They are chemical resistant.

A4 Stainless Steel Hex Head Cap Screws

A4 Stainless Steel Hex Head Cap Screws
Made from Metric Grade A4 stainless steel, these screws come in a plain finish or NL-19 corrosion-resistant finish. NL-19 finishes are proprietary treatments that modify the surface of stainless steel fasteners, making them brighter, stronger and more corrosion-resistant than plain stainless steel. Grade A4 hex screws are more chemically resistant than Grade A2 stainless steel and are designed for chemical and marine environments to secure heavy-duty objects within or against other objects.

Plastic Hex Head Cap Screws

Plastic Hex Head Cap Screws
These screws are light-duty, cost-effective fasteners made from nylon or enriched plastic. While nylon may absorb moisture, other plastics resist water, oils, and corrosion. Because they are lighter than traditional metal screws, they are used in areas where weight is a concern and insulation is needed. Plastic screws can be adjusted as needed to limit vibration and noise.

Bronze Hex Head Cap Screws

Bronze Hex Head Cap Screws

These screws are sold in a plain bronze finish and are used in marine environments, areas of high corrosion and high heat, and in electrical installations.

Brass Hex Head Cap Screws

Brass Hex Head Cap Screws

These screws are sold in a plain finish and are frequently used to fasten marine equipment or for underwater construction needs. They resist foul weather and high-UV environments.

Grade 8 Steel Left Hand Hex Head Cap Screws

Grade 8 Steel Left Hand Hex Head Cap Screws
Left hand threaded fasteners are tightened by turning them counter clockwise instead of clockwise. High-tensile Grade 8 hex cap screws are stronger than grades 2 or 5 steel and are commonly used in motors, generators, plumbing applications, automotive suspensions, and construction. These screws hold fast in high-stress areas. They come in a zinc yellow, or black oxide finish, for corrosion resistance. Black oxide screws work well in dry environments and zinc yellow screws resist corrosion in wet environments.

18-8 Stainless Steel Left Hand Hex Head Cap Screws

18-8 Stainless Steel Left Hand Hex Head Cap Screws

Left hand threaded fasteners are tightened by turning them counter clockwise instead of clockwise. Made from 18-8 stainless steel, these screws are magnetic and chemical resistant. These screws are designed to secure heavy-duty objects within or against other objects in harsh environments.

Mil. Spec Hex Head Cap Screws

Mil. Spec Hex Head Cap Screws

These Mil. Spec. hex head cap screws meet or exceed U.S. military specifications and standards to ensure high performance and reliability in extreme conditions. They are often used for defense-specific applications, aerospace, and other highly demanding situations.

Hex Head Cap Screw Assortments

Hex Head Cap Screw Assortments
Hex head cap screws are threaded fasteners with hexagonal heads, which are six-sided tops without indentations. These screw assortments include a variety of steel or stainless steel screw sizes, finishes, and lengths. Length is measured from under the head for each of the screws. Higher-grade steel screws are suitable for fastening heavier materials like most machinery and equipment. Others may be used for light-duty applications or, if coated, for marine environments.
Note: Product availability is real-time basis and adjusted continuously. The product will be reserved for you when you complete your order.