Alloy Steel Socket Shoulder Screws (Stripper Bolts) with Nylon Insert

Alloy steel socket shoulder screws, commonly known as stripper bolts, with nylon insert combine a precision-machined shoulder with a factory-installed nylon locking element that provides prevailing torque during installation. The smooth shoulder serves as a bearing surface, guide, pivot, or spacer for moving components, while the threaded portion secures the assembly and the nylon insert helps resist thread loosening caused by vibration, repeated motion, and dynamic loading.

These fasteners are widely used in dies, tooling, fixtures, molds, automation equipment, robotics, conveyor systems, indexing mechanisms, rollers, guide assemblies, cams, linkages, packaging machinery, and OEM equipment where accurate positioning and controlled component movement are required. The internal hex drive allows installation in confined spaces while maintaining a compact assembly and providing convenient serviceability.

Manufactured from alloy steel, these socket shoulder screws are intended for demanding industrial mechanical applications. Proper fastener selection should consider shoulder diameter, shoulder length, thread size, threaded length, bearing requirements, mating-component tolerances, installation access, and operating conditions. The nylon insert provides prevailing torque but should not be considered a substitute for proper joint design or installation practices.

Cold Headers supplies alloy steel socket shoulder screws (stripper bolts) with nylon insert in a broad range of shoulder diameters, shoulder lengths, and thread sizes, including uncommon and difficult-to-source configurations. Individual product pages provide verified shoulder dimensions, thread specifications, head dimensions, hex socket size, and additional engineering information to support accurate product selection.

Why Choose Socket Shoulder Screws with Nylon Insert?

  • Factory-installed nylon insert: Provides prevailing torque to help resist thread loosening.
  • Precision shoulder: Functions as a bearing surface, guide, pivot, spacer, or locating feature.
  • Internal hex drive: Allows installation where external wrench clearance is limited.
  • Alloy steel construction: Intended for demanding industrial mechanical applications.
  • Verified engineering dimensions: Product pages provide shoulder diameter, shoulder length, thread size, and hex socket size where available.

Selecting the Correct Socket Shoulder Screw

Begin by confirming the required shoulder diameter, shoulder length, and thread size. Review bearing requirements, mating-component tolerances, installation clearance, operating conditions, and the desired level of prevailing torque before selecting a fastener. Final selection should reflect the functional and mechanical requirements of the assembly.

Cold Headers Inc. has supplied specialty industrial socket fasteners since 1962. Our catalog helps engineers, distributors, maintenance teams, and purchasing professionals locate exact shoulder dimensions, uncommon sizes, and difficult-to-find socket shoulder screws (stripper bolts) with nylon insert without unsupported inventory claims.

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

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1/4 x 3/8 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert
List Price (per 100 pieces) $67.00
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1/4 x 1/2 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert
List Price (per 100 pieces) $68.00
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1/4 x 5/8 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert
List Price (per 100 pieces) $69.00
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1/4 x 3/4 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert
List Price (per 100 pieces) $70.00
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1/4 x 1 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert
List Price (per 100 pieces) $71.00
Description N/A

1/4 x 3/8 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert uses a ground shoulder to guide, space, or support motion while the nylon-insert threaded end supplies prevailing torque. The ground shoulder works as the bearing, guide, pivot, spacer, or travel-control surface, while the smaller 10-24 threaded end anchors into the die shoe or fixture. That nylon insert helps the screw resist backing out during cyclic shock, vibration, or press operation without implying permanent locking.

In progressive dies, stripper plate return, guide pins, and die-shoe repair, the shoulder length helps establish travel or stand-off while the smaller 10-24 thread retains the screw. Alloy steel suits strength-focused tooling, but the part should be kept oiled or indoors when exposure is a concern. For joints torqued once and left alone, compare plain Alloy Steel Socket Head Stripper Bolts.

Cold Headers has supplied specialty socket fasteners since 1962, with practical support for hard-to-find stripper bolt sizes. Nylon inserts are installed in-house at our Chicago facility. Check the shoulder fit, threaded-end engagement, head clearance, and pellet location when comparing this part to an existing screw.

Technical Highlights

  • Shoulder Diameter: 1/4 in. nominal; 0.248 max / 0.246 min
  • Shoulder Length: 3/8 in.
  • Thread Size and Nominal Thread Length: 10-24 x 3/8 in.
  • Head Diameter: 0.375 max / 0.357 min
  • Head Height: 0.188 max / 0.177 min
  • Hex Key Size: 1/8 in.
  • Material: Heat-Treated Alloy Steel
  • Locking Feature: Nylon insert in threaded end, providing prevailing torque
  • Nylon Insert Diameter (P): 3/32 in.
  • Nylon Insert Location (N): 5/32 in. (+/-1/2 pitch)

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

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1/4 x 1/2 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert is sized for tooling and fixture work where the shoulder is the operating surface, not merely a fastener shank. The shoulder provides the controlled interface, the 10-24 threaded end retains the part, and the socket head keeps installation access available from the top side. That nylon insert helps the screw resist backing out during cyclic shock, vibration, or press operation without implying permanent locking.

In stamping dies, spring-loaded stripper plates, guided plate travel, and punch tooling, the shoulder length helps establish travel or stand-off while the smaller 10-24 thread retains the screw. The nylon element limits service temperature compared to an all-metal screw; ask about plain stripper bolts for hot tooling. When the application calls for stainless material instead of alloy steel, review 18-8 Stainless Steel Stripper Bolts.

Cold Headers supports die repair, OEM sourcing, and distributor requests for uncommon shoulder lengths and nylon-insert configurations. The size callout should be matched to the travel requirement, shoulder bearing surface, tapped hole, and access for the hex key.

Technical Highlights

  • Shoulder Diameter: 1/4 in. nominal; 0.248 max / 0.246 min
  • Shoulder Length: 1/2 in.
  • Thread Size and Nominal Thread Length: 10-24 x 3/8 in.
  • Head Diameter: 0.375 max / 0.357 min
  • Head Height: 0.188 max / 0.177 min
  • Hex Key Size: 1/8 in.
  • Material: Heat-Treated Alloy Steel
  • Locking Feature: Nylon insert in threaded end, providing prevailing torque
  • Nylon Insert Diameter (P): 3/32 in.
  • Nylon Insert Location (N): 5/32 in. (+/-1/2 pitch)

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

 		N/A

1/4 x 5/8 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert combines a socket head, a precision shoulder, and a nylon insert for controlled travel in inch-size die hardware. In stripper-bolt service, the shoulder sets motion or stand-off while the threaded end secures the assembly into the tapped member. That nylon insert helps the screw resist backing out during cyclic shock, vibration, or press operation without implying permanent locking.

Use this size for tooling plates, fixture nests, guide bushings, and repeatable locating details when the drawing calls for a bearing shoulder plus a retained threaded end. A 1/4 in. shoulder measures 0.246-0.248 in.; it is sized to slide and pivot, not press into the mating component. For metric die sets, compare Metric Socket Head Stripper Bolts instead of converting inch shoulder sizes.

For maintenance and toolroom sourcing, Cold Headers helps match exact shoulder dimensions rather than forcing a near-size substitute. Before ordering, compare the drawing to the shoulder size, thread size, head envelope, hex key, and nylon pellet placement.

Technical Highlights

  • Shoulder Diameter: 1/4 in. nominal; 0.248 max / 0.246 min
  • Shoulder Length: 5/8 in.
  • Thread Size and Nominal Thread Length: 10-24 x 3/8 in.
  • Head Diameter: 0.375 max / 0.357 min
  • Head Height: 0.188 max / 0.177 min
  • Hex Key Size: 1/8 in.
  • Material: Heat-Treated Alloy Steel
  • Locking Feature: Nylon insert in threaded end, providing prevailing torque
  • Nylon Insert Diameter (P): 3/32 in.
  • Nylon Insert Location (N): 5/32 in. (+/-1/2 pitch)

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

 		N/A

1/4 x 3/4 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert gives punch-and-die assemblies a defined shoulder length with a locking element in the threaded end. The nylon pellet belongs in the threaded end, so it adds prevailing torque without changing the working shoulder surface. That nylon insert helps the screw resist backing out during cyclic shock, vibration, or press operation without implying permanent locking.

Use this size for cam followers, linkage pivots, moving stops, and serviceable machine linkages when the drawing calls for a bearing shoulder plus a retained threaded end. Check the mating hole, die shoe thread, and working clearance before substituting another shoulder diameter or length.

Cold Headers is a Chicago specialty socket fastener distributor focused on exact-size sourcing for industrial replacement needs. Need the pellet in a non-catalog size or a different location? In-house pelletizing means we can do that. For repair work, verify the shoulder length, working diameter, threaded end, and locking-pellet position against the removed fastener.

Technical Highlights

  • Shoulder Diameter: 1/4 in. nominal; 0.248 max / 0.246 min
  • Shoulder Length: 3/4 in.
  • Thread Size and Nominal Thread Length: 10-24 x 3/8 in.
  • Head Diameter: 0.375 max / 0.357 min
  • Head Height: 0.188 max / 0.177 min
  • Hex Key Size: 1/8 in.
  • Material: Heat-Treated Alloy Steel
  • Locking Feature: Nylon insert in threaded end, providing prevailing torque
  • Nylon Insert Diameter (P): 3/32 in.
  • Nylon Insert Location (N): 5/32 in. (+/-1/2 pitch)

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

 		N/A

1/4 x 1 Alloy Steel Socket Head Shoulder Screw (Stripper Bolt) with Nylon Insert is built for applications where a stripper bolt must carry motion while remaining seated in the tapped member. The ground shoulder works as the bearing, guide, pivot, spacer, or travel-control surface, while the smaller 10-24 threaded end anchors into the die shoe or fixture. That nylon insert helps the screw resist backing out during cyclic shock, vibration, or press operation without implying permanent locking.

For rotary fixtures, indexing tooling, sliding details, and production alignment stations, the shoulder can act as the controlled surface while the nylon insert helps resist backing out under cyclic motion. Because the pellet is in the threaded end, it does not change the shoulder's guiding or bearing function.

Use Cold Headers when a drawing, service record, or die book calls for a specific stripper bolt size that is not easy to source. Review the shoulder diameter, shoulder length, thread, head dimensions, hex key, and pellet location before matching a print.

Technical Highlights

  • Shoulder Diameter: 1/4 in. nominal; 0.248 max / 0.246 min
  • Shoulder Length: 1 in.
  • Thread Size and Nominal Thread Length: 10-24 x 3/8 in.
  • Head Diameter: 0.375 max / 0.357 min
  • Head Height: 0.188 max / 0.177 min
  • Hex Key Size: 1/8 in.
  • Material: Heat-Treated Alloy Steel
  • Locking Feature: Nylon insert in threaded end, providing prevailing torque
  • Nylon Insert Diameter (P): 3/32 in.
  • Nylon Insert Location (N): 5/32 in. (+/-1/2 pitch)

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
Brands N/A Cold Headers, Inc.
Shoulder Diameter N/A 1/4 in
Shoulder Length N/A 3/8 in N/A 1/2 in N/A 5/8 in N/A 3/4 in N/A 1 in
Material N/A Alloy Steel
Quantity N/A 25
Package Type N/A Box
Note N/A Less Than Package Quantity Specified Plus 25%.