Cold Headers
Cold Headers
5514 N. Elston Ave
Chicago, IL 60630
Phone: 1-773-775-7900
Fax: 1-773-775-0779
Email: sales@coldheaders.com
Website: www.coldheaders.com
Working Hours: Mon - Fri 8:00am - 4:30pm CST
Saturday - Sunday CLOSED If you have any questions, please call or email us.
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Half Dog Point Alloy Steel Socket Set Screws with Nylon Insert

Half dog point alloy steel socket set screws with nylon insert combine the locating capability of a half dog point with a factory-installed nylon locking element that provides prevailing torque during installation. The short cylindrical projection of the half dog point is designed for applications requiring engagement with a mating hole, slot, or recess to assist with component positioning and alignment, 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 both positive positioning and secure thread retention. They are commonly specified for collars, hubs, gears, pulleys, couplings, machine tooling, indexing mechanisms, automation equipment, fixtures, conveyors, maintenance repairs, and OEM manufacturing where repeatable positioning is important.

Proper fastener selection should consider thread size, screw length, half dog point dimensions, hex socket size, mating component geometry, installation access, 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 half dog 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 Half Dog Point Alloy Steel Socket Set Screws with Nylon Insert?

  • Factory-installed nylon insert: Provides prevailing torque to help resist thread loosening.
  • Half dog point: Short locating projection commonly selected for engagement with mating holes, slots, or recesses.
  • Alloy steel construction: Intended for demanding industrial mechanical applications.
  • Internal hex drive: Allows installation using standard hex keys where external wrench clearance is limited.
  • Verified engineering dimensions: Product pages provide thread size, screw length, point dimensions, nominal diameter, hex socket size, and additional engineering information where available.

Selecting the Correct Half Dog Point Socket Set Screw

Begin by confirming the required thread size and screw length. Review the half dog point dimensions, mating component geometry, hex socket size, installation clearance, operating environment, and assembly requirements before selecting a fastener. Half dog point socket set screws should not be substituted automatically for cup point, cone point, flat point, oval point, knurled cup 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 half dog point 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.

set-screw-half-dog-nylon-pellet.png
Unit of Measure
Items set-screw-half-dog-nylon-pellet.png
4-40 x 1/4 SSS Half Dog Point Alloy NI
4-40 x 1/4 Half Dog Point Alloy Steel Socket Set Screw with Nylon Insert
List Price (per 100 pieces) $86.00
 set-screw-half-dog-nylon-pellet.png
4-40 x 5/16 SSS Half Dog Point Alloy NI
4-40 x 5/16 Half Dog Point Alloy Steel Socket Set Screw with Nylon Insert
List Price (per 100 pieces) $86.25
 set-screw-half-dog-nylon-pellet.png
4-40 x 3/8 SSS Half Dog Point Alloy NI
4-40 x 3/8 Half Dog Point Alloy Steel Socket Set Screw with Nylon Insert
List Price (per 100 pieces) Call or Email for Pricing
 set-screw-half-dog-nylon-pellet.png
4-40 x 7/16 SSS Half Dog Point Alloy NI
4-40 x 7/16 Half Dog Point Alloy Steel Socket Set Screw with Nylon Insert
List Price (per 100 pieces) Call or Email for Pricing
 set-screw-half-dog-nylon-pellet.png
4-40 x 1/2 SSS Half Dog Point Alloy NI
4-40 x 1/2 Half Dog 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 1/4 Half Dog Point Alloy Steel Socket Set Screw with Nylon Insert is a heat-treated alloy steel half dog point socket set screw with a nylon insert for prevailing torque. Compared with a longer full dog projection, the half dog form can work with a shallower receiving hole and thinner surrounding material.

Couplings that must be assembled in one orientation can use the locating stub to reduce walk and rotation after alignment. Check mating feature, hex access, screw length, and marking tolerance. Cold Headers installs nylon locking pellets at its Chicago facility for this half dog point locking set screw family.

Cold Headers helps buyers keep the half dog point requirement visible when similar nylon-insert set screws are easy to confuse. Review insert dimensions, hex key size, and ASME B18.3 before ordering this alloy steel socket set screw.

Technical Highlights

  • Point: Half Dog (short cylindrical locating stub)
  • 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): 9/64 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 Half Dog Point Alloy Steel Socket Set Screw with Nylon Insert uses a short cylindrical locating stub to register into a drilled seat, slot, or groove. Because the point registers into a prepared feature, check the shaft, hub, or fixture detail before substituting a cup point style.

Fixture stops that register in milled slots can use the stub for repeatable placement while the insert supports the setting. Check mating feature, hex access, screw length, and marking tolerance. If there is no drilled seat and the screw must grip a plain shaft, Cup Point Alloy Set Screws with Nylon Insert are the comparison family.

Cold Headers has supplied specialty socket fasteners since 1962 and keeps point style, insert feature, thread, and length tied to the exact item. Review insert dimensions, hex key size, and ASME B18.3 before ordering this alloy steel socket set screw.

Technical Highlights

  • Point: Half Dog (short cylindrical locating stub)
  • 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): 9/64 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 Half Dog Point Alloy Steel Socket Set Screw with Nylon Insert is built for assemblies where location is controlled by a half dog point rather than by point bite alone. This point style is chosen when repeatable angular or axial location matters more than a bite mark on an unprepared shaft.

OEM assemblies with drilled locating seats use these screws to make service replacement more repeatable. Check mating feature, hex access, screw length, and marking tolerance.

When a print calls for a locating stub plus nylon thread drag, Cold Headers can quote the matching catalog item by exact size. Review insert dimensions, hex key size, and ASME B18.3 before ordering this alloy steel socket set screw.

Technical Highlights

  • Point: Half Dog (short cylindrical locating stub)
  • 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): 9/64 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 Half Dog Point Alloy Steel Socket Set Screw with Nylon Insert combines internal hex access, a half dog locating stub, and a nylon locking pellet in one headless fastener. Use the half dog style where the receiving hole, slot, or groove is part of the assembly design.

Maintenance repairs often require the same thread, length, point style, and nylon insert already shown on the service record. Check mating feature, hex access, screw length, and marking tolerance. In-house pellet installation helps support nylon-insert requirements where a plain half dog screw would not meet the print.

Cold Headers works with distributors, OEM teams, and maintenance programs that need exact socket set screw configurations. Review insert dimensions, hex key size, and ASME B18.3 before ordering this alloy steel socket set screw.

Technical Highlights

  • Point: Half Dog (short cylindrical locating stub)
  • 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): 9/64 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 1/2 Half Dog Point Alloy Steel Socket Set Screw with Nylon Insert gives machine designers a compact locating set screw where a full dog projection is more engagement than the part needs. Compared with a longer full dog projection, the half dog form can work with a shallower receiving hole and thinner surrounding material.

Repair assemblies with thin hub walls can favor the half dog form when a shallower receiving feature is available. Check mating feature, hex access, screw length, and marking tolerance.

Since 1962, Cold Headers has supported industrial buyers where a small difference in set screw point geometry changes the fit. Review insert dimensions, hex key size, and ASME B18.3 before ordering this alloy steel socket set screw.

Technical Highlights

  • Point: Half Dog (short cylindrical locating stub)
  • Material: Alloy Steel
  • Thread Size: 4-40
  • Length: 1/2 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): 9/64 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 1/4 in N/A 5/16 in N/A 3/8 in N/A 7/16 in N/A 1/2 in
Material N/A Nylon
Quantity N/A 100
Package Type N/A Box
Note N/A Less Than Package Quantity Specified Plus 25%.