Cold Headers
Cold Headers
5514 N. Elston Ave
Chicago, IL 60630
Phone: 1-773-775-7900
Fax: 1-773-775-0779
Email: sales@coldheaders.com
Website: www.coldheaders.com
Working Hours: Mon - Fri 8:00am - 4:30pm CST
Saturday - Sunday CLOSED If you have any questions, please call or email us.
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Brass Button Head Socket Cap Screws

Brass button head socket cap screws feature a smooth, low-profile rounded head with an internal hex drive, making them well suited for applications requiring a compact fastening solution together with the appearance and corrosion resistance of brass. The broad bearing surface of the button head helps distribute clamping force while maintaining a lower profile than a standard socket head cap screw.

Manufactured from brass, these fasteners are commonly selected for electrical equipment, instrumentation, decorative hardware, laboratory equipment, architectural assemblies, pumps, valves, electronic equipment, maintenance repairs, and OEM applications where brass is the specified material. The internal hex drive allows installation where external wrench clearance is limited while providing a clean, finished appearance.

Proper fastener selection should consider thread size, screw length, nominal body diameter, head diameter, head height, hex socket size, mating-thread engagement, installation access, and service environment. Individual product pages provide verified engineering dimensions to help engineers and purchasing professionals specify the correct fastener for demanding industrial and commercial applications.

Cold Headers supplies brass button head socket cap screws in a broad range of inch thread sizes and lengths, including standard, uncommon, and difficult-to-source configurations. Our catalog is organized to simplify exact-size sourcing while providing consistent engineering information across every product family.

Why Choose Brass Button Head Socket Cap Screws?

  • Low-profile button head: Provides a smooth, rounded head with a broad bearing surface.
  • Internal hex drive: Allows installation using standard hex keys or hex bits.
  • Brass construction: Commonly selected for corrosion-resistant, decorative, electrical, and instrumentation applications.
  • Wide range of applications: Frequently used in plumbing and fluid-handling equipment, electronics, architectural assemblies, OEM equipment, and maintenance projects.
  • Verified engineering dimensions: Product pages provide thread size, body diameter, head diameter, head height, and hex socket size where available.

Selecting the Correct Brass Button Head Socket Cap Screw

Begin by confirming the required thread size and screw length. Review the nominal body diameter, head diameter, head height, hex socket size, installation clearance, mating-thread engagement, and operating environment before selecting a fastener. Final material selection should reflect the mechanical, environmental, and appearance requirements of the completed assembly. If your application involves continuous moisture, chemicals, or elevated temperatures, contact our sales team to confirm the right alloy for your service conditions. For saltwater and marine environments, we recommend our 316 Stainless Steel fasteners.

Cold Headers Inc. has supplied specialty industrial socket fasteners since 1962. Our catalog helps engineers, distributors, maintenance professionals, and purchasing teams locate exact sizes, uncommon lengths, and difficult-to-find button head socket cap screws without unsupported inventory claims.

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.

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Unit of Measure
Items button-head-socket-cap-screw-brass.png
4-40 x 1/4 BHCS Brass-Button
4-40 x 1/4 Brass Button Head Socket Cap Screw
List Price (per 100 pieces) $30.00
 button-head-socket-cap-screw-brass.png
4-40 x 3/8 BHCS Brass-Button
4-40 x 3/8 Brass Button Head Socket Cap Screw
List Price (per 100 pieces) $32.00
 button-head-socket-cap-screw-brass.png
4-40 x 1/2 BHCS Brass-Button
4-40 x 1/2 Brass Button Head Socket Cap Screw
List Price (per 100 pieces) $34.00
 button-head-socket-cap-screw-brass.png
4-40 x 5/8 BHCS Brass-Button
4-40 x 5/8 Brass Button Head Socket Cap Screw
List Price (per 100 pieces) $35.00
 button-head-socket-cap-screw-brass.png
4-40 x 3/4 BHCS Brass-Button
4-40 x 3/4 Brass Button Head Socket Cap Screw
List Price (per 100 pieces) $36.00
Description N/A

4-40 x 1/4 Brass Button Head Socket Cap Screw is specified where engineers want a smooth exposed head, socket-drive access, and the electrical advantages of non-ferrous construction. The button-head geometry is chosen for reduced head projection and a smooth exposed appearance while keeping the head visible and accessible. Engineers choose brass here for electrical conductivity, non-magnetic behavior, and non-ferrous construction rather than high-strength structural loading.

Appropriate uses include electrical assemblies and control panels, where conductivity and non-magnetic construction can be useful around selected hardware and instrumentation layouts. It can also fit electronic equipment and display hardware, where a decorative appearance and lower head projection help exposed hardware look intentional. The internal hex drive supports socket-key installation in compact equipment without relying on an external wrenching surface.

For the 4-40 thread and 1/4 in. length, the reference head diameter is 0.201-0.213 in. and the head height is 0.051-0.059 in. Use the verified dimensions below when checking head projection, socket access, and replacement fit.

Technical Highlights

  • Material: Brass
  • Thread Size: 4-40
  • Length: 1/4 in.
  • Nominal Body Diameter: #4 (.112 in.)
  • Head Diameter: 0.201-0.213 in.
  • Head Height: 0.051-0.059 in.
  • Hex-Key Size: 1/16 in.
  • Drive Type: Internal Hex

Reference dimensions may vary slightly by manufacturer.

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote. 		N/A

4-40 x 3/8 Brass Button Head Socket Cap Screw supports low-load assemblies that need a rounded button head along with electrical conductivity and non-magnetic material behavior. Compared with taller head styles, the rounded button head can reduce snag potential on panels, covers, and handled surfaces. The material is often selected when conductivity, machinability, and appearance are more relevant than the strength profile of alloy steel.

Appropriate uses include instrumentation and precision equipment, where the finished button head keeps visible fastening points smooth while the material machines cleanly. It can also fit machine covers and automation equipment, where internal hex drive access supports installation where side clearance for external tooling is limited. The internal hex drive supports socket-key installation in compact equipment without relying on an external wrenching surface.

For the 4-40 thread and 3/8 in. length, the reference head diameter is 0.201-0.213 in. and the head height is 0.051-0.059 in. Use the verified dimensions below when checking head projection, socket access, and replacement fit.

Technical Highlights

  • Material: Brass
  • Thread Size: 4-40
  • Length: 3/8 in.
  • Nominal Body Diameter: #4 (.112 in.)
  • Head Diameter: 0.201-0.213 in.
  • Head Height: 0.051-0.059 in.
  • Hex-Key Size: 1/16 in.
  • Drive Type: Internal Hex

Reference dimensions may vary slightly by manufacturer.

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote. 		N/A

4-40 x 1/2 Brass Button Head Socket Cap Screw is used where reduced head projection and a clean visible appearance are important on brass hardware. The internal hex drive keeps the installation tool inside the head, which is useful when external wrench clearance is limited. Brass is appropriate for many low-load mechanical assemblies where corrosion resistance in general service, appearance, and electrical behavior matter.

Appropriate uses include electronic equipment and display hardware, where a decorative appearance and lower head projection help exposed hardware look intentional. It can also fit electrical assemblies and control panels, where conductivity and non-magnetic construction can be useful around selected hardware and instrumentation layouts. The internal hex drive supports socket-key installation in compact equipment without relying on an external wrenching surface.

For the 4-40 thread and 1/2 in. length, the reference head diameter is 0.201-0.213 in. and the head height is 0.051-0.059 in. Use the verified dimensions below when checking head projection, socket access, and replacement fit.

Technical Highlights

  • Material: Brass
  • Thread Size: 4-40
  • Length: 1/2 in.
  • Nominal Body Diameter: #4 (.112 in.)
  • Head Diameter: 0.201-0.213 in.
  • Head Height: 0.051-0.059 in.
  • Hex-Key Size: 1/16 in.
  • Drive Type: Internal Hex

Reference dimensions may vary slightly by manufacturer.

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote. 		N/A

4-40 x 5/8 Brass Button Head Socket Cap Screw helps designers combine a compact rounded head profile with material properties useful for electrical and instrumentation work. The broader bearing surface can be helpful on covers, light brackets, and equipment panels where the head remains visible. The material supports clean machining and a finished look for commercial hardware, instruments, and visible assemblies.

Appropriate uses include laboratory equipment and commercial fixtures, where non-ferrous construction and a clean exposed head are often preferred over plain steel hardware. It can also fit laboratory equipment and commercial fixtures, where non-ferrous construction and a clean exposed head are often preferred over plain steel hardware. The internal hex drive supports socket-key installation in compact equipment without relying on an external wrenching surface.

For the 4-40 thread and 5/8 in. length, the reference head diameter is 0.201-0.213 in. and the head height is 0.051-0.059 in. Use the verified dimensions below when checking head projection, socket access, and replacement fit.

Technical Highlights

  • Material: Brass
  • Thread Size: 4-40
  • Length: 5/8 in.
  • Nominal Body Diameter: #4 (.112 in.)
  • Head Diameter: 0.201-0.213 in.
  • Head Height: 0.051-0.059 in.
  • Hex-Key Size: 1/16 in.
  • Drive Type: Internal Hex

Reference dimensions may vary slightly by manufacturer.

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote. 		N/A

4-40 x 3/4 Brass Button Head Socket Cap Screw is selected for exposed fastening points where appearance, machinability, and internal hex access matter more than high-strength fastening. This head style is a practical choice where the fastener should remain accessible while presenting a compact rounded profile. Because brass is non-ferrous, it can be useful in selected electrical, instrument, and laboratory applications where magnetic response is undesirable.

Appropriate uses include architectural hardware and commercial brass components, where the rounded head provides a finished appearance on visible covers and trim. It can also fit maintenance work and assembly operations, where the exact thread and length help match drawings, repair lists, and existing brass hardware. The internal hex drive supports socket-key installation in compact equipment without relying on an external wrenching surface.

For the 4-40 thread and 3/4 in. length, the reference head diameter is 0.201-0.213 in. and the head height is 0.051-0.059 in. Use the verified dimensions below when checking head projection, socket access, and replacement fit.

Technical Highlights

  • Material: Brass
  • Thread Size: 4-40
  • Length: 3/4 in.
  • Nominal Body Diameter: #4 (.112 in.)
  • Head Diameter: 0.201-0.213 in.
  • Head Height: 0.051-0.059 in.
  • Hex-Key Size: 1/16 in.
  • Drive Type: Internal Hex

Reference dimensions may vary slightly by manufacturer.

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
Brands N/A Cold Headers, Inc.
Diameter N/A 4-40
Length N/A 1/4 in N/A 3/8 in N/A 1/2 in N/A 5/8 in N/A 3/4 in
Material N/A Brass
Quantity N/A 100
Package Type N/A Box