Knurled Point 18-8 Stainless Steel Socket Set Screws

Knurled point 18-8 stainless steel 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 serrated knurled point is designed to increase contact with the mating surface for applications requiring dependable holding characteristics. Their compact design allows installation flush with or below the surrounding surface.

Manufactured from 18-8 stainless steel, these socket set screws provide general corrosion resistance for many industrial environments exposed to moisture, humidity, or routine washdown. They are commonly specified for machinery, automation equipment, conveyors, power transmission systems, instrumentation, maintenance repairs, food processing equipment, and OEM manufacturing where stainless steel construction is preferred.

Knurled point geometry is commonly selected where increased contact with the mating surface is desired. Depending on the shaft material and installation conditions, the serrated point may leave a witness mark 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 knurled point 18-8 stainless steel 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 Knurled Point 18-8 Stainless Steel Socket Set Screws?

  • Knurled point geometry: Serrated point designed to increase contact with the mating surface.
  • Internal hex drive: Allows installation using standard hex keys where external wrench clearance is limited.
  • 18-8 stainless steel: Provides general corrosion resistance for many industrial environments.
  • Wide industrial use: Commonly specified for machinery, conveyors, automation equipment, power transmission systems, instrumentation, 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 Knurled 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. Knurled point socket set screws should not be substituted automatically for cup point, cone point, flat point, oval 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 knurled point socket set screws without unsupported inventory claims.

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

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Items
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4-40 x 1/8 Knurled Point 18-8 Stainless Steel Socket Set Screw
List Price (per 100 pieces) $16.00
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4-40 x 3/16 Knurled Point 18-8 Stainless Steel Socket Set Screw
List Price (per 100 pieces) $16.50
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4-40 x 1/4 Knurled Point 18-8 Stainless Steel Socket Set Screw
List Price (per 100 pieces) $17.00
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4-40 x 5/16 Knurled Point 18-8 Stainless Steel Socket Set Screw
List Price (per 100 pieces) $18.00
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4-40 x 3/8 Knurled Point 18-8 Stainless Steel Socket Set Screw
List Price (per 100 pieces) $19.00
Description N/A

4-40 x 1/8 Knurled Point 18-8 Stainless Steel Socket Set Screw identifies a stainless knurled point set screw where the end geometry matters as much as the thread and length.

Instead of presenting a smooth cup edge, the knurled point creates small teeth at the contact ring so the fastener can resist vibration-driven movement in the right mating material.

For stainless assemblies, review thread fit and installation practice because stainless-on-stainless contact can raise galling concerns if the joint is assembled dry or repeatedly adjusted.

Use cases for 4-40 x 1/8 include shaft collars, hubs, and positioning collars and instrumentation, equipment panels, and stainless control hardware where a headless internal-hex screw keeps the component exterior clear.

For 4-40, UNC has 40 threads per inch; check the 1/8 in. length against tapped depth and point location. Check the screw length against the contact location so the point reaches the intended surface without bottoming out. Cold Headers can assist with exact-size stainless set screw sourcing for maintenance, distributor, and production needs.

Technical Highlights

  • Point Style: Knurled Point
  • Material: 18-8 Stainless Steel
  • Thread Size: 4-40
  • Length: 1/8 in.
  • Thread Series: UNC
  • Threads Per Inch: 40
  • Drive Type: Internal Hex
 		N/A

4-40 x 3/16 Knurled Point 18-8 Stainless Steel Socket Set Screw is intended for threaded locations that need a headless 18-8 set screw with a serrated cup end.

Cup-point serrations add bite at the contact area, making this style useful for shaft collars, stops, knobs, and adjustment parts that need localized holding contact.

The 18-8 stainless construction can be appropriate for instrumentation, packaging equipment, enclosures, and outdoor general-service hardware when the environment and load are compatible with the specified material.

Use cases for 4-40 x 3/16 include gear hubs, pulleys, sprockets, and compact stops and production equipment where the screw must sit fully inside the tapped component where a headless internal-hex screw keeps the component exterior clear.

For 4-40, UNC has 40 threads per inch; check the 3/16 in. length against tapped depth and point location. Use the thread designation and length together when matching prints, service records, or prior purchase history. Cold Headers has supplied specialty socket fasteners since 1962 and can help identify uncommon stainless configurations.

Technical Highlights

  • Point Style: Knurled Point
  • Material: 18-8 Stainless Steel
  • Thread Size: 4-40
  • Length: 3/16 in.
  • Thread Series: UNC
  • Threads Per Inch: 40
  • Drive Type: Internal Hex
 		N/A

4-40 x 1/4 Knurled Point 18-8 Stainless Steel Socket Set Screw gives maintenance teams a size-specific 18-8 stainless option for knurled point retention work.

In blind holes and collars, the knurled cup point can provide a self-locking bite through surface engagement rather than relying on an external head or washer.

For stainless assemblies, review thread fit and installation practice because stainless-on-stainless contact can raise galling concerns if the joint is assembled dry or repeatedly adjusted.

Use cases for 4-40 x 1/4 include control knobs, handles, machine stops, and adjustment assemblies and control knobs, handles, machine stops, and adjustment assemblies where a headless internal-hex screw keeps the component exterior clear.

For 4-40, UNC has 40 threads per inch; check the 1/4 in. length against tapped depth and point location. Check the screw length against the contact location so the point reaches the intended surface without bottoming out. Cold Headers supports buyers who need the knurled point detail preserved during sourcing rather than blended into a generic set screw request.

Technical Highlights

  • Point Style: Knurled Point
  • Material: 18-8 Stainless Steel
  • Thread Size: 4-40
  • Length: 1/4 in.
  • Thread Series: UNC
  • Threads Per Inch: 40
  • Drive Type: Internal Hex
 		N/A

4-40 x 5/16 Knurled Point 18-8 Stainless Steel Socket Set Screw keeps the knurled point callout visible for hubs, collars, and adjustment hardware exposed to moisture.

Instead of presenting a smooth cup edge, the knurled point creates small teeth at the contact ring so the fastener can resist vibration-driven movement in the right mating material.

The 18-8 stainless construction can be appropriate for instrumentation, packaging equipment, enclosures, and outdoor general-service hardware when the environment and load are compatible with the specified material.

Use cases for 4-40 x 5/16 include automation equipment, packaging machinery, and conveyor components and fixtures, removable stops, shaft-mounted accessories, and couplings where a headless internal-hex screw keeps the component exterior clear.

For 4-40, UNC has 40 threads per inch; check the 5/16 in. length against tapped depth and point location. Use the thread designation and length together when matching prints, service records, or prior purchase history. Cold Headers helps quote specialty stainless socket products by exact thread, length, material, and point style.

Technical Highlights

  • Point Style: Knurled Point
  • Material: 18-8 Stainless Steel
  • Thread Size: 4-40
  • Length: 5/16 in.
  • Thread Series: UNC
  • Threads Per Inch: 40
  • Drive Type: Internal Hex
 		N/A

4-40 x 3/8 Knurled Point 18-8 Stainless Steel Socket Set Screw is a compact internal-hex set screw for assemblies that specify 18-8 stainless material and knurled contact.

Cup-point serrations add bite at the contact area, making this style useful for shaft collars, stops, knobs, and adjustment parts that need localized holding contact.

For stainless assemblies, review thread fit and installation practice because stainless-on-stainless contact can raise galling concerns if the joint is assembled dry or repeatedly adjusted.

Use cases for 4-40 x 3/8 include instrumentation, equipment panels, and stainless control hardware and shaft collars, hubs, and positioning collars where a headless internal-hex screw keeps the component exterior clear.

For 4-40, UNC has 40 threads per inch; check the 3/8 in. length against tapped depth and point location. Check the screw length against the contact location so the point reaches the intended surface without bottoming out. Cold Headers works with socket fastener requirements where small catalog details can affect the final order.

Technical Highlights

  • Point Style: Knurled Point
  • Material: 18-8 Stainless Steel
  • Thread Size: 4-40
  • Length: 3/8 in.
  • Thread Series: UNC
  • Threads Per Inch: 40
  • Drive Type: Internal Hex
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 18-8 Stainless Steel
Quantity N/A 100
Package Type N/A Box
Note N/A Less Than Package Quantity Specified Plus 25%.