Flat Point Alloy Steel Socket Set Screws with Nylon Insert

Flat point alloy steel socket set screws with nylon insert combine the smooth bearing surface of a flat point set screw with a factory-installed nylon locking element that provides prevailing torque during installation. The flat point is designed to contact the mating surface without the concentrated penetration associated with pointed styles, while the nylon insert helps increase resistance to thread loosening caused by vibration, repeated movement, and dynamic loading. The internal hex drive allows installation where external wrench clearance is limited.

Manufactured from alloy steel, these socket set screws are intended for demanding industrial mechanical applications requiring secure positioning with reduced surface marking. Flat point designs are commonly selected for collars, hubs, pulleys, gears, knobs, adjustment mechanisms, guides, fixtures, and other shaft-mounted components where repeated repositioning or protection of the mating surface is an important consideration. They are widely used in machinery, automation equipment, power transmission systems, conveyors, maintenance repairs, tooling, and OEM manufacturing.

Proper fastener selection should consider thread size, screw length, hex socket size, mating material, installation access, acceptable holding characteristics, and service conditions. Individual product pages provide verified engineering dimensions, including thread size, screw length, nominal diameter, hex socket size, and additional engineering information where available. The nylon insert provides prevailing torque but should not be considered a substitute for proper joint design or installation practices.

Cold Headers supplies flat point alloy steel socket set screws with nylon insert 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 Flat Point Alloy Steel Socket Set Screws with Nylon Insert?

Factory-installed nylon insert: Provides prevailing torque to help resist thread loosening.
Flat point geometry: Provides broad bearing contact with reduced surface marking compared to pointed styles.
Alloy steel construction: Intended for demanding industrial mechanical applications.
Internal hex drive: Allows installation where external wrench clearance is limited.
Verified engineering dimensions: Product pages provide thread size, screw length, nominal diameter, hex socket size, and additional engineering information where available.

Selecting the Correct Flat 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, and assembly requirements before selecting a fastener. Flat point socket set screws should not be substituted automatically for cup point, cone 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 alloy steel socket set screws with nylon insert without unsupported inventory claims.

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

Unit of Measure

Items	4-40 x 3/16 SSS Flat Point Alloy NI 4-40 x 3/16 Flat Point Alloy Steel Socket Set Screw with Nylon Insert List Price (per 100 pieces) $94.00	4-40 x 1/4 SSS Flat Point Alloy NI 4-40 x 1/4 Flat Point Alloy Steel Socket Set Screw with Nylon Insert List Price (per 100 pieces) $86.00	4-40 x 5/16 SSS Flat Point Alloy NI 4-40 x 5/16 Flat Point Alloy Steel Socket Set Screw with Nylon Insert List Price (per 100 pieces) $86.25	4-40 x 3/8 SSS Flat Point Alloy NI 4-40 x 3/8 Flat Point Alloy Steel Socket Set Screw with Nylon Insert List Price (per 100 pieces) $86.50	4-40 x 7/16 SSS Flat Point Alloy NI 4-40 x 7/16 Flat Point Alloy Steel Socket Set Screw with Nylon Insert List Price (per 100 pieces) Call or Email for Pricing
Description	N/A 4-40 x 3/16 Flat Point Alloy Steel Socket Set Screw with Nylon Insert is a heat-treated alloy steel flat point socket set screw with a nylon insert for prevailing torque. Flat point geometry favors surface protection and repeatable adjustment rather than maximum bite into the mating part. Use the heat-treated alloy steel body with the nylon locking pellet where the application calls for mechanical fastening rather than stainless material. Fixtures that move between production runs may use the flat face to reduce surface damage during repeated clamping. When maximum bite matters more than shaft protection, compare Cup Point Alloy Set Screws with Nylon Insert. Cold Headers installs nylon locking pellets in-house at its Chicago facility for this flat point set screw family. Since 1962, Cold Headers has helped buyers sort closely related socket products that can be easy to confuse. Check thread size, length, socket size, pellet dimensions, shaft-flat condition, and surface-marking tolerance before substitution. Technical Highlights Point: Flat (full bearing face) Material: Alloy Steel Thread Size: 4-40 Length: 3/16 in. Drive: Internal Hex Hex Key Size: 0.050 in. Locking Feature: Nylon insert providing prevailing torque Nylon Insert Diameter (P): 1/16 in. Nylon Insert Location (N): 3/32 in., +/-1/2 pitch Dimensional Standard: ASME B18.3 Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.	N/A 4-40 x 1/4 Flat Point Alloy Steel Socket Set Screw with Nylon Insert is built for no-mark clamping where a broad flat face bears against the shaft instead of biting into it. The internal hex drive keeps the screw headless and accessible in collars, hubs, and compact machine details. Use the heat-treated alloy steel body with the nylon locking pellet where the application calls for mechanical fastening rather than stainless material. OEM assemblies pairing flats on shafts with flat points use the mating geometry to spread contact across the seat. ASME B18.3 places flat point diameter in a qualitative band of about 0.55-0.62 times nominal screw diameter, so confirm the mating seat rather than substituting a sharp point. Cold Headers supports industrial distributors, OEM buyers, and maintenance teams when a set screw must match the existing print. Check thread size, length, socket size, pellet dimensions, shaft-flat condition, and surface-marking tolerance before substitution. Technical Highlights Point: Flat (full bearing face) Material: Alloy Steel Thread Size: 4-40 Length: 1/4 in. Drive: Internal Hex Hex Key Size: 0.050 in. Locking Feature: Nylon insert providing prevailing torque Nylon Insert Diameter (P): 1/16 in. Nylon Insert Location (N): 3/32 in., +/-1/2 pitch Dimensional Standard: ASME B18.3 Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.	N/A 4-40 x 5/16 Flat Point Alloy Steel Socket Set Screw with Nylon Insert combines a flat bearing point, internal hex drive, and nylon locking pellet for adjustable machine settings. The flat point clamps by friction, so it is commonly chosen for shafts that should not be intentionally marked by a biting point. Use the heat-treated alloy steel body with the nylon locking pellet where the application calls for mechanical fastening rather than stainless material. Machine rebuilds use this family when the service record calls for alloy steel, a flat point, and a nylon insert. The catalog keeps this family separate from plain flat point screws so the nylon insert requirement remains visible. Check thread size, length, socket size, pellet dimensions, shaft-flat condition, and surface-marking tolerance before substitution. Technical Highlights Point: Flat (full bearing face) Material: Alloy Steel Thread Size: 4-40 Length: 5/16 in. Drive: Internal Hex Hex Key Size: 0.050 in. Locking Feature: Nylon insert providing prevailing torque Nylon Insert Diameter (P): 1/16 in. Nylon Insert Location (N): 3/32 in., +/-1/2 pitch Dimensional Standard: ASME B18.3 Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.	N/A 4-40 x 3/8 Flat Point Alloy Steel Socket Set Screw with Nylon Insert gives designers a surface-respecting set screw option when the shaft should remain usable after repositioning. This point style is useful when the part may be loosened, slid, and reclamped during changeover or setup. Use the heat-treated alloy steel body with the nylon locking pellet where the application calls for mechanical fastening rather than stainless material. Drive collars and light hub assemblies may specify this style when shaft protection matters more than a point bite. In-house pellet installation supports uncommon flat point nylon-insert requirements when a standard plain screw is not enough. Cold Headers can quote the requested flat point nylon-insert configuration without changing the point style to a biting design. Check thread size, length, socket size, pellet dimensions, shaft-flat condition, and surface-marking tolerance before substitution. Technical Highlights Point: Flat (full bearing face) Material: Alloy Steel Thread Size: 4-40 Length: 3/8 in. Drive: Internal Hex Hex Key Size: 0.050 in. Locking Feature: Nylon insert providing prevailing torque Nylon Insert Diameter (P): 1/16 in. Nylon Insert Location (N): 3/32 in., +/-1/2 pitch Dimensional Standard: ASME B18.3 Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.	N/A 4-40 x 7/16 Flat Point Alloy Steel Socket Set Screw with Nylon Insert is specified when friction clamping and thread-level locking are both required in a headless fastener. Flat point geometry favors surface protection and repeatable adjustment rather than maximum bite into the mating part. Use the heat-treated alloy steel body with the nylon locking pellet where the application calls for mechanical fastening rather than stainless material. Large 5/8 flat point nylon-insert sizes support heavier collars and hubs where the print still calls for shaft-friendly contact. ASME B18.3 places flat point diameter in a qualitative band of about 0.55-0.62 times nominal screw diameter, so confirm the mating seat rather than substituting a sharp point. Do not treat plain alloy steel as corrosion resistant; protect or oil the part when the environment demands it. Cold Headers has supplied specialty socket fasteners since 1962 and keeps point style, insert type, and size language clear. Check size, socket, pellet dimensions, and surface-marking tolerance before substitution. Technical Highlights Point: Flat (full bearing face) Material: Alloy Steel Thread Size: 4-40 Length: 7/16 in. Drive: Internal Hex Hex Key Size: 0.050 in. Locking Feature: Nylon insert providing prevailing torque Nylon Insert Diameter (P): 1/16 in. Nylon Insert Location (N): 3/32 in., +/-1/2 pitch Dimensional Standard: ASME B18.3 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 3/16 in	N/A 1/4 in	N/A 5/16 in	N/A 3/8 in	N/A 7/16 in
Material	N/A Nylon
Quantity	N/A 100
Package Type	N/A Box
Note	N/A Less Than Package Quantity Specified Plus 25%.