Brass Socket Head Cap Screws | Cold Headers Since 1962

Brass Socket Head Cap Screws

Nobody specifies a brass socket head cap screw for brute clamping force — that's what our alloy steel line is for. A Brass Socket Head Cap Screw gets picked for what the metal itself does: it conducts electricity, it ignores magnets, it shrugs off water service, and it looks finished on the day it's installed and ten years later. The socket head format adds its own advantages to that list — a compact cylindrical head that seats flush in a counterbore, and an internal hex drive that wrenches in tight quarters where an open-end wrench can't swing. That combination is why these screws show up in electrical equipment, grounding and panel work, instrumentation, laboratory devices, plumbing and fluid-handling equipment, and architectural hardware where the fastener stays visible.

One piece of shop wisdom that belongs on this page: brass asks for a lighter hand. It's a softer metal than steel, which is part of its charm — but it means the correct-size hex key, fully seated, and torque appropriate to brass rather than the number you'd use on an alloy screw. Treated that way, the socket stays crisp through repeated service. Treated like steel, it won't.

Brass alloys vary in composition and corrosion behavior. 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.

Need a size that isn't listed?

Our online catalog highlights our standard inventory but does not represent every size or configuration we can supply. Brass socket products are a thin-stock item across the industry — which is exactly why we keep them — and we can frequently quote:

Special lengths
Non-catalog sizes
Difficult-to-source brass fasteners
OEM production quantities
Distributor volume requirements

If you don't see the exact Brass Socket Head Cap Screw you need, please contact us. There's a good chance we can quote or supply it.

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

Unit of Measure

Items	4-40 x 1/4 SHCS Brass Socket 4-40 x 1/4 Brass Socket Head Cap Screw List Price (per 100 pieces) $27.00	4-40 x 3/8 SHCS Brass Socket 4-40 x 3/8 Brass Socket Head Cap Screw List Price (per 100 pieces) $29.00	4-40 x 1/2 SHCS Brass Socket 4-40 x 1/2 Brass Socket Head Cap Screw List Price (per 100 pieces) $31.00	4-40 x 5/8 SHCS Brass Socket 4-40 x 5/8 Brass Socket Head Cap Screw List Price (per 100 pieces) $32.00	4-40 x 3/4 SHCS Brass Socket 4-40 x 3/4 Brass Socket Head Cap Screw List Price (per 100 pieces) $33.00
Description	N/A 4-40 x 1/4 Brass Socket Head Cap Screw is specified where a non-ferrous internal-hex fastener is preferred for electrical assemblies or precision hardware. The brass material is appropriate for compatible low-strength joints where conductivity and appearance are design considerations. Hex-key installation helps technicians reach fastening points inside covers, panels, brackets, fixtures, and housings. Typical placements include electrical assemblies, control panels, and switchgear hardware where brass material properties and socket access are useful. Engineering departments can evaluate head clearance, drive access, and brass material compatibility before releasing the assembly. Technical Highlights: Material: Brass; Thread: 4-40 UNC; Length: 1/4 in.; Nominal Body Diameter: 0.112 in.; Head Diameter: 0.183 in. max / 0.176 in. min; Head Height: 0.112 in. max / 0.108 in. min; Hex Key Size: 3/32; Drive Type: internal hex. Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.	N/A 4-40 x 3/8 Brass Socket Head Cap Screw helps solve fastening needs in equipment where conductivity, non-magnetic behavior, and clean appearance are more important than clamping load. Brass is often selected for electrical conductivity, non-magnetic properties, machinability, and a clean finished appearance. The cylindrical head gives designers a compact bearing surface while preserving socket drive access for service. Typical placements include instrumentation, sensor brackets, and laboratory fixtures where brass material properties and socket access are useful. Industrial distributors can support customers who need a size-specific brass socket head cap screw for repair or production use. Technical Highlights: Material: Brass; Thread: 4-40 UNC; Length: 3/8 in.; Nominal Body Diameter: 0.112 in.; Head Diameter: 0.183 in. max / 0.176 in. min; Head Height: 0.112 in. max / 0.108 in. min; Hex Key Size: 3/32; Drive Type: internal hex. Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.	N/A 4-40 x 1/2 Brass Socket Head Cap Screw provides a brass socket-drive option for compact assemblies that need hex-key installation and material compatibility. Engineers may specify brass when the assembly benefits from machinable, non-magnetic, or conductive hardware characteristics. Internal-hex engagement gives engineering departments a familiar drive style for brass machine components. Typical placements include electronic assemblies, terminal hardware, and equipment covers where brass material properties and socket access are useful. Purchasing agents can source the specified brass fastener without changing the approved product family or material. Technical Highlights: Material: Brass; Thread: 4-40 UNC; Length: 1/2 in.; Nominal Body Diameter: 0.112 in.; Head Diameter: 0.183 in. max / 0.176 in. min; Head Height: 0.112 in. max / 0.108 in. min; Hex Key Size: 3/32; Drive Type: internal hex. Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.	N/A 4-40 x 5/8 Brass Socket Head Cap Screw is commonly used when drawings call for a socket head cap screw in brass rather than alloy steel or stainless steel. Brass provides general corrosion resistance in many indoor environments while also supporting commercial and decorative hardware requirements. The drive style supports controlled removal and reinstallation during maintenance, adjustment, or instrument service. Typical placements include lighting equipment, commercial fixtures, and architectural hardware where brass material properties and socket access are useful. Maintenance teams can match the thread, length, material, and head geometry already specified on service documentation. Technical Highlights: Material: Brass; Thread: 4-40 UNC; Length: 5/8 in.; Nominal Body Diameter: 0.112 in.; Head Diameter: 0.183 in. max / 0.176 in. min; Head Height: 0.112 in. max / 0.108 in. min; Hex Key Size: 3/32; Drive Type: internal hex. Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.	N/A 4-40 x 3/4 Brass Socket Head Cap Screw supports equipment designs that need a brass machine screw with cylindrical head geometry and internal-hex engagement. The non-ferrous construction can be useful near electrical components, test fixtures, controls, and instruments. The internal hex drive supports positive tool engagement where surrounding components limit outside wrench clearance. Typical placements include precision instruments, test equipment, and panel-mounted hardware where brass material properties and socket access are useful. Design engineers can compare the listed head dimensions and hex key size against counterbore and tool-access requirements. Technical Highlights: Material: Brass; Thread: 4-40 UNC; Length: 3/4 in.; Nominal Body Diameter: 0.112 in.; Head Diameter: 0.183 in. max / 0.176 in. min; Head Height: 0.112 in. max / 0.108 in. min; Hex Key Size: 3/32; Drive Type: internal hex. 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