Any products or lengths not seen in our catalog, please email (sales@coldheaders.com) or call (773-775-7900) for pricing as we may consider this a non-catalog item.
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4-40 x 1/4 Alloy Steel Button Head Socket Cap Screw with Nylon Insert
List Price (per 100 pieces) $72.50
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4-40 x 3/8 Alloy Steel Button Head Socket Cap Screw with Nylon Insert
List Price (per 100 pieces) $72.75
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4-40 x 1/2 Alloy Steel Button Head Socket Cap Screw with Nylon Insert
List Price (per 100 pieces) $73.00
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4-40 x 5/8 Alloy Steel Button Head Socket Cap Screw with Nylon Insert
List Price (per 100 pieces) Call or Email for Pricing
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4-40 x 3/4 Alloy Steel Button Head Socket Cap Screw with Nylon Insert
List Price (per 100 pieces) Call or Email for Pricing
Description N/A 4-40 x 1/4 Alloy Steel Button Head Socket Cap Screw with Nylon Insert helps engineers combine a smooth button head appearance with added resistance to loosening from movement. Alloy steel construction and internal hex drive access support machine-building applications that still require practical installation. The insert feature should be matched to the mating hardware and service conditions specified for the assembly. The 4-40 x 1/4 size supports exact catalog selection for machine guards, equipment covers, panels, brackets, and manufacturing workcells. For engineers, OEM manufacturers, purchasing managers, and maintenance professionals, this alloy steel part helps match the fastener to the assembly without changing the locked dimensions. Industrial distributors, purchasing teams, maintenance professionals, and machine builders are common sourcing contexts for this product family. Call Cold Headers at 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote. N/A 4-40 x 3/8 Alloy Steel Button Head Socket Cap Screw with Nylon Insert is used when a broad bearing surface, internal hex drive, and nylon insert feature are required together. It is a practical option when purchasing teams want a socket-drive fastener with an integrated nylon insert feature. The nylon insert provides prevailing-torque resistance that can help reduce loosening in machinery subject to vibration or repeated movement. The 4-40 x 3/8 size supports exact catalog selection for robotics, packaging machinery, inspection fixtures, and serviceable machine components. For engineers, OEM manufacturers, purchasing managers, and maintenance professionals, this alloy steel part helps match the fastener to the assembly without changing the locked dimensions. Automation systems, tooling plates, machine frames, and engineered fastening locations are common sourcing contexts for this product family. Call Cold Headers at 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote. N/A 4-40 x 1/2 Alloy Steel Button Head Socket Cap Screw with Nylon Insert is specified where a rounded button head and nylon insert are needed for exposed or vibration-prone hardware. This feature is useful for OEM equipment, automation systems, covers, guards, and service locations where joint retention matters. Alloy steel construction and internal hex drive access support machine-building applications that still require practical installation. The 4-40 x 1/2 size supports exact catalog selection for tool and die work, fixture construction, material-handling equipment, and assembly machinery. For engineers, OEM manufacturers, purchasing managers, and maintenance professionals, this alloy steel part helps match the fastener to the assembly without changing the locked dimensions. Oem production, distributor stock programs, plant maintenance, and repair departments are common sourcing contexts for this product family. Call Cold Headers at 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote. N/A 4-40 x 5/8 Alloy Steel Button Head Socket Cap Screw with Nylon Insert supports covers, guards, panels, and enclosures where a nylon insert can help maintain clamp load in service. The insert feature should be matched to the mating hardware and service conditions specified for the assembly. It is a practical option when purchasing teams want a socket-drive fastener with an integrated nylon insert feature. The 4-40 x 5/8 size supports exact catalog selection for industrial machinery, maintenance repairs, production equipment, and equipment rebuilds. For engineers, OEM manufacturers, purchasing managers, and maintenance professionals, this alloy steel part helps match the fastener to the assembly without changing the locked dimensions. Machine guards, equipment covers, panels, brackets, and manufacturing workcells are common sourcing contexts for this product family. Call Cold Headers at 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote. N/A 4-40 x 3/4 Alloy Steel Button Head Socket Cap Screw with Nylon Insert gives OEM equipment builders a button head socket cap screw option for vibration-related applications. The nylon insert provides prevailing-torque resistance that can help reduce loosening in machinery subject to vibration or repeated movement. This feature is useful for OEM equipment, automation systems, covers, guards, and service locations where joint retention matters. The 4-40 x 3/4 size supports exact catalog selection for machine building, tooling, fixtures, automation equipment, and OEM machinery. For engineers, OEM manufacturers, purchasing managers, and maintenance professionals, this alloy steel part helps match the fastener to the assembly without changing the locked dimensions. Robotics, packaging machinery, inspection fixtures, and serviceable machine components are common sourcing contexts for this product family. Call Cold Headers at 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 Alloy Steel
Quantity N/A 100
Package Type N/A Box
Note N/A Less Than Package Quantity Specified Plus 25%.