316 Stainless Steel Cup Point Socket Set Screws

316 stainless steel cup point socket set screws are headless threaded fasteners designed to secure collars, hubs, gears, pulleys, couplings, sprockets, knobs, handles, and other shaft-mounted components. The internal hex drive allows installation where external wrench clearance is limited, while the recessed cup point creates localized rim contact with the mating surface to help secure assembled components. Their compact design makes them well suited for applications where the fastener should install flush with or below the surrounding surface.

Manufactured from 316 stainless steel, these socket set screws provide enhanced corrosion resistance compared to many general-purpose stainless steel fasteners, making them well suited for applications exposed to moisture, saltwater, chemicals, and other corrosive environments. They are commonly specified for marine equipment, chemical processing equipment, food processing machinery, pumps, valves, automation equipment, maintenance repairs, and OEM assemblies where corrosion resistance is an important design consideration.

Cup point geometry is frequently selected where concentrated contact with the mating surface is desired. Depending on the shaft material and installation conditions, the point may leave a witness mark or shallow indentation on the contacted surface. Proper fastener selection should consider thread size, screw length, hex socket size, mating material, installation access, acceptable surface marking, and service conditions. Individual product pages provide verified engineering dimensions to assist engineers and purchasing professionals in selecting the appropriate fastener.

Cold Headers supplies 316 stainless steel cup point socket set 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 316 Stainless Steel Cup Point Socket Set Screws?

Cup point geometry: Creates localized rim contact with the mating surface.
Internal hex drive: Allows installation using standard hex keys where external wrench clearance is limited.
316 stainless steel: Offers enhanced corrosion resistance for demanding industrial environments.
Wide industrial use: Commonly specified for marine equipment, chemical processing, food processing, pumps, valves, automation equipment, and OEM assemblies.
Verified engineering dimensions: Product pages provide thread size, screw length, nominal diameter, hex socket size, and additional engineering information where available.

Selecting the Correct 316 Stainless Steel Cup Point Socket Set Screw

Begin by confirming the required thread size and screw length. Review the hex socket size, mating material, installation clearance, operating environment, acceptable surface marking, and assembly requirements before selecting a fastener. Cup point socket set screws should not be substituted automatically for cone point, flat point, oval point, knurled cup point, half dog point, or full dog point designs because each point geometry serves a different mechanical function.

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 socket set screws without unsupported inventory claims.

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

Unit of Measure

Items	CPSS-316 4-40 x 1/8 4-40 x 1/8 316 Stainless Steel Cup Point Socket Set Screw List Price (per 100 pieces) $31.00	CPSS-316 4-40 x 3/16 4-40 x 3/16 316 Stainless Steel Cup Point Socket Set Screw List Price (per 100 pieces) $32.00	CPSS-316 4-40 x 1/4 4-40 x 1/4 316 Stainless Steel Cup Point Socket Set Screw List Price (per 100 pieces) $33.00	CPSS-316 4-40 x 5/16 4-40 x 5/16 316 Stainless Steel Cup Point Socket Set Screw List Price (per 100 pieces) $46.00	CPSS-316 4-40 x 3/8 4-40 x 3/8 316 Stainless Steel Cup Point Socket Set Screw List Price (per 100 pieces) $47.00
Description	N/A 4-40 x 1/8 316 Stainless Steel Cup Point Socket Set Screw is a 316 Stainless Steel Cup Point Socket Set Screw used when a headless internal-hex fastener is specified for retaining or positioning a component. It is commonly used in shaft collars, hubs, and control components, where a headless fastener secures a part without external head clearance. The internal hex drive allows socket-wrench access from the threaded hole, which is useful when surrounding components leave little room for external wrenching. Review the 4-40 thread, 1/8 in. length, socket size, cup point diameter, mating surface, and exposure before specifying the item. Confirm that point contact, 316 material, and service conditions fit the application. 316 stainless steel is often selected for improved corrosion resistance where moisture, cleaning chemicals, or chloride exposure matter. The cup point creates rim-focused contact that may help resist relative movement when the screw, mating material, and installation conditions are appropriate. Cold Headers supports exact-size sourcing for 316 stainless socket set screws, including uncommon lengths and replacement requirements. Technical Highlights Material: 316 Stainless Steel Thread Size: 4-40 Length: 1/8 in. Point Style: Cup Point Nominal Screw Diameter: 0.112 in. Hex Socket Size: 0.050 in. Cup Point Diameter: 0.051-0.061 in. Drive Type: Internal Hex Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.	N/A Designed for compact set-screw fastening, 4-40 x 3/16 316 Stainless Steel Cup Point Socket Set Screw combines 316 stainless steel construction with a cup-shaped point for localized contact at the mating surface. Typical use cases include process equipment, pulleys, and sprockets, especially where localized contact helps position a component on a shaft. The internal hex drive keeps installation access compact while the headless body remains contained within the mating part. For purchasing and replacement work, confirm the 4-40 thread, 3/16 in. length, socket size, and cup point diameter match the drawing or installed part. Confirm point contact, 316 material, and service conditions fit the application. Use 316 stainless where the assembly calls for this material because of exposure or process-equipment requirements. The recessed end form is often chosen where a witness mark or indentation on the mating surface is acceptable for the holding method. Cold Headers has supplied specialty socket fasteners since 1962 and helps buyers identify difficult 316 stainless set screw configurations. Technical Highlights Material: 316 Stainless Steel Thread Size: 4-40 Length: 3/16 in. Point Style: Cup Point Nominal Screw Diameter: 0.112 in. Hex Socket Size: 0.050 in. Cup Point Diameter: 0.051-0.061 in. Drive Type: Internal Hex Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.	N/A For assemblies that call for a 316 stainless set screw by exact size, 4-40 x 1/4 316 Stainless Steel Cup Point Socket Set Screw identifies the required material, cup point geometry, thread, and length. In couplings, knobs, and handles, this screw is often selected where the screw must sit inside a tapped part. The socket drive helps maintenance and assembly teams install or remove the fastener without needing side clearance around a head. Selection should account for mating material, drive access, chloride or chemical exposure, temperature, and whether localized point contact is acceptable. This 4-40 x 1/4 size gives buyers a precise callout for ordering. It can fit washdown equipment, outdoor machinery, instrumentation, water-treatment hardware, and process equipment when 316 is specified. The point geometry gives the installer a defined end form for localized holding contact rather than a general-purpose threaded plug. Cold Headers works with distributors, maintenance teams, and production buyers that need clear size identification for specialty stainless socket products. Technical Highlights Material: 316 Stainless Steel Thread Size: 4-40 Length: 1/4 in. Point Style: Cup Point Nominal Screw Diameter: 0.112 in. Hex Socket Size: 0.050 in. Cup Point Diameter: 0.051-0.061 in. Drive Type: Internal Hex Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.	N/A 4-40 x 5/16 316 Stainless Steel Cup Point Socket Set Screw is commonly specified where a component must be secured from within a tapped hole rather than with an external screw head. Applications often include instrumentation, fixtures, and adjustment assemblies, where compact internal-hex access is useful during setup. The internal hex recess gives the installer controlled drive engagement while keeping the fastener profile inside the tapped component. The verified dimensions below help engineering and purchasing teams compare the screw before ordering. Confirm that point contact, 316 material, and service conditions fit the application. Final material selection should reflect chemical exposure, temperature, load, mating material, and service environment. This point style is intended for applications where localized contact is part of the retaining method, not for assemblies that require a nonmarking tip. Cold Headers helps match set screw thread, length, point style, material, and socket drive details for industrial purchasing and repair work. Technical Highlights Material: 316 Stainless Steel Thread Size: 4-40 Length: 5/16 in. Point Style: Cup Point Nominal Screw Diameter: 0.112 in. Hex Socket Size: 0.050 in. Cup Point Diameter: 0.051-0.061 in. Drive Type: Internal Hex Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.	N/A When a maintenance list or drawing calls for a 316 stainless cup point set screw, 4-40 x 3/8 316 Stainless Steel Cup Point Socket Set Screw provides a clear product callout for purchasing and replacement work. It is commonly used in washdown equipment, packaging machinery, and automation systems, where stainless material and socket-drive serviceability matter. The internal hex drive allows socket-wrench access from the threaded hole, which is useful when surrounding components leave little room for external wrenching. Review the 4-40 thread, 3/8 in. length, socket size, cup point diameter, mating surface, and exposure before specifying the item. Confirm that point contact, 316 material, and service conditions fit the application. 316 stainless steel is often selected for improved corrosion resistance where moisture, cleaning chemicals, or chloride exposure matter. Buyers should review the shaft or component surface condition, available drive access, environmental exposure, and required holding action before selecting this item. Cold Headers is a useful source when the part number, thread, point style, 316 material, or length is difficult to locate through standard catalog channels. Technical Highlights Material: 316 Stainless Steel Thread Size: 4-40 Length: 3/8 in. Point Style: Cup Point Nominal Screw Diameter: 0.112 in. Hex Socket Size: 0.050 in. Cup Point Diameter: 0.051-0.061 in. 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 1/8 in	N/A 3/16 in	N/A 1/4 in	N/A 5/16 in	N/A 3/8 in
Material	N/A 316 Stainless Steel
Quantity	N/A 100
Note	N/A Less Than Package Quantity Specified Plus 25%.
Package Type	N/A Box