Shoulder Screws
4974 Products
Alloy Steel Shoulder Screws
These screws are designed to provide a precise bearing surface and are ideal for applications requiring strength and high performance, such as in machinery and heavy-duty assemblies. Their alloy steel construction ensures increased toughness and resistance to wear.
Metric Alloy Steel Shoulder Screws
These screws provide a precise bearing surface and are ideal for applications requiring strength and high performance, such as in machinery and assemblies, where precise metric sizing and enhanced toughness are essential.
Short-Thread Alloy Steel Shoulder Screws
This design is ideal for applications requiring a precise bearing surface with minimal threading, providing strength and high performance while reducing the length of the threaded portion. These screws are commonly used in machinery and assemblies where space is limited and precise alignment is critical.
Same-Size Thread AlloySteel Shoulder Screws
This design ensures uniform strength and load distribution along the entire length of the screw, making them ideal for applications that require a precise bearing surface and consistent performance. They are commonly used in machinery and mechanical assemblies where uniformity and reliability are crucial.
Metric Same-Size ThreadAlloy Steel Shoulder Screws
This design ensures uniform strength and load distribution along the entire length of the screw. They are ideal for applications requiring precise alignment and performance, such as in machinery and mechanical assemblies where consistent metrics and reliable load-bearing are essential.
Alloy Steel Shoulder Screwswith Material Certification
The certification ensures that the screws meet the required mechanical and chemical properties, providing reliable performance in critical applications. These screws are ideal for use in industries where material traceability and quality assurance are crucial, such as in aerospace, automotive, and high-precision machinery.
18-8 Stainless Steel Shoulder Screws
They feature a cylindrical, unthreaded shoulder between the head and the threaded portion, providing a precise bearing surface. These screws are commonly used in environments where resistance to corrosion and high performance are required, such as in machinery, assemblies, and equipment exposed to harsh conditions.
Metric 18-8 StainlessSteel Shoulder Screws
They feature a cylindrical, unthreaded shoulder between the head and the threaded portion, offering a precise bearing surface. These screws are ideal for applications requiring metric sizing, high performance, and resistance to corrosion, commonly used in machinery, assemblies, and equipment exposed to harsh conditions.
Same-Size Thread 18-8Stainless Steel Shoulder Screws
This design ensures uniform strength and load distribution along the entire length of the screw while providing excellent corrosion resistance. They are ideal for applications requiring precise alignment and consistent performance, such as in machinery and mechanical assemblies where reliable load-bearing and resistance to corrosion are crucial.
316 Stainless Steel Shoulder Screws
They feature a cylindrical, unthreaded shoulder between the head and the threaded portion, providing a precise bearing surface. These screws are ideal for applications in harsh environments, such as marine, chemical processing, and high-temperature industries, where enhanced corrosion resistance and strength are essential.
Metric 316 StainlessSteel Shoulder Screws
They feature a cylindrical, unthreaded shoulder between the head and the threaded portion. These screws are ideal for use in environments exposed to harsh conditions, such as marine or chemical applications, where both metric sizing and high corrosion resistance are essential.
High-Strength 17-4 PH StainlessSteel Shoulder Screws
The "PH" refers to precipitation hardening, a process that enhances the material's mechanical properties. These screws feature a cylindrical, unthreaded shoulder between the head and the threaded portion, providing a precise bearing surface.
Nylon Shoulder Screws
These screws are ideal for applications where resistance to corrosion and electrical insulation are important, such as in electronic devices, machinery, and assemblies where non-metallic components are preferred. They provide a precise bearing surface and are used in environments where reduced weight and non-conductivity are beneficial.
Aluminum Shoulder Screws
They are lightweight and offer good corrosion resistance while providing a precise bearing surface. These screws are commonly used in applications where weight reduction is important, such as in aerospace, automotive, and machinery, and where moderate strength and corrosion resistance are required.
Titanium Shoulder Screws
They feature a cylindrical, unthreaded shoulder between the head and the threaded portion, providing a precise bearing surface. These screws are ideal for applications requiring high strength, low weight, and resistance to harsh environments, such as in aerospace, medical devices, and high-performance machinery.
Nickel Alloy Shoulder Screws
They feature a cylindrical, unthreaded shoulder between the head and the threaded portion, offering a precise bearing surface. These screws are ideal for use in extreme environments and applications requiring high performance, such as in aerospace, chemical processing, and high-temperature industries, where both strength and resistance to harsh conditions are essential.
Metric Slotted Low-ProfileSteel Shoulder Screws
This design provides a precise bearing surface while allowing for a more compact and sleek appearance. They are ideal for applications where space is limited and a low-profile head is desired, offering strength and reliability in machinery and mechanical assemblies.
Low-Profile Shoulder Screws
This design provides a sleek and compact profile, making them suitable for applications where space is limited or where a low-profile appearance is preferred. They are used in machinery and assemblies where both precise alignment and minimal head height are required.
Metric Low-Profile Shoulder Screws
This design offers a compact and sleek profile, making them ideal for applications with space constraints or where a low-profile appearance is needed. They provide strength and precision in machinery and mechanical assemblies while maintaining a minimal head height.
Ultra-Low-Profile Shoulder Screws
This design offers an extremely compact profile, making them ideal for applications with severe space limitations or where an extremely low-profile appearance is required. They are used in precision machinery and assemblies where both minimal head height and high-performance functionality are essential.
Metric Steel Hex Head Shoulder Screws
Metric Steel Hex Head Shoulder Screws are fasteners made to metric specifications with a hexagonal head and a cylindrical, unthreaded shoulder between the head and the threaded portion.
Steel Hex Head Shoulder Screws
The hex head allows for easy tightening with a wrench, while the shoulder provides a precise bearing surface. These screws are used in various applications where strength, ease of installation, and reliable performance are required, such as in machinery and mechanical assemblies.
Stainless Steel HexHead Shoulder Screws
The stainless steel construction offers excellent corrosion resistance and durability. The hex head allows for easy tightening with a wrench, while the shoulder provides a precise bearing surface. These screws are ideal for applications in environments where corrosion resistance and reliable performance are essential, such as in machinery, equipment, and assemblies exposed to harsh conditions.
Alloy Steel Thread-LockingShoulder Screws
They feature a cylindrical, unthreaded shoulder between the head and the threaded portion. The thread-locking mechanism, often achieved through coatings or mechanical features, ensures a secure fit in applications where vibration resistance and reliability are crucial, such as in machinery and high-stress environments.
Metric Alloy SteelThread-Locking Shoulder Screws
They have a cylindrical, unthreaded shoulder between the head and the threaded portion. The thread-locking feature ensures a secure fit, making them ideal for applications where vibration resistance and reliable performance are critical, such as in machinery and high-stress environments.
18-8 Stainless SteelThread-Locking Shoulder Screws
They have a cylindrical, unthreaded shoulder between the head and the threaded portion. The 18-8 stainless steel provides excellent corrosion resistance and durability, making these screws suitable for applications where both secure fastening and resistance to harsh environments are essential.
Super-Corrosion-Resistant 316 StainlessSteel Thread-Locking Shoulder Screws
They feature a thread-locking mechanism to prevent loosening from vibrations or torque, along with a cylindrical, unthreaded shoulder between the head and the threaded portion. These screws are ideal for use in extreme conditions, such as marine environments, chemical processing, and high-temperature applications, where both superior corrosion resistance and secure fastening are required.
Flat Head Shoulder Screws
The flat head design allows for a flush or low-profile fit in applications, providing a neat appearance and a large bearing surface. These screws are used in various assemblies and machinery where a flush mount is needed, offering stability and strength with a low head profile.
Internally Threaded Shoulders
This design allows for the attachment of other components or fasteners directly onto the shoulder, providing a secure connection point. These screws are often used in applications where multiple components need to be assembled or adjusted using the same fastener, offering flexibility and precision in mechanical and engineering assemblies.
Shoulder Screws with Hex-Drive Tip
This design allows for secure tightening with a hex wrench or socket, providing a precise and strong connection. These screws are used in various mechanical assemblies where the ease of installation and high torque capabilities are important, offering reliable performance and durability.
Left-Hand Threaded Shoulder Screws
These screws are used in applications where components are subjected to counterclockwise forces or where reverse threading is needed to prevent loosening under normal conditions. They are ideal for specialized machinery and assemblies requiring unique threading configurations.
LILY Bearing stocks shoulder screws (also called stripper bolts) — fasteners with three distinct sections: a head, a precision-ground unthreaded shoulder that serves as the working bearing surface, and a threaded tail smaller in diameter than the shoulder. Because the shoulder (not the thread) carries the load, shoulder screws are commonly used as pivot points, cam followers, and linear-motion guides. Use the filters below, or the comparison table, to narrow down by material, shoulder diameter, and length.
Compare by Material
| Material | Best For |
|---|---|
| Alloy Steel | General-purpose pivots, cam followers, and jigs and fixtures where high strength is needed |
| 18-8 Stainless Steel | General corrosion resistance for a wide range of applications |
| 316 Stainless Steel | Highly corrosive environments, including marine and chemical exposure |
| 17-4 PH Stainless Steel | Applications needing both high strength and corrosion resistance |
| Titanium | High-performance applications needing an excellent strength-to-weight ratio |
| Nickel Alloy | Resistance to corrosion, high temperatures, and oxidation in harsh environments |
| Aluminum | Lightweight applications where reducing weight is a priority |
| Nylon | Electrically insulating pivots or light-duty guides where metal isn't suitable |
Head Style Options
Most shoulder screws use a socket (hex-drive) head as standard. Hex head versions are also available for wrench-driven installation, and flat head versions let the head sit flush in a countersunk hole. Shoulder screws with a hex-drive tip add a drive socket at the threaded end, making it easier to remove the screw from a blind hole.
Profile Options
Low-profile and ultra-low-profile shoulder screws use a shorter, flatter head than the standard socket head, for use where clearance above the mounting surface is limited.
Thread Configuration Variants
| Variant | What It Is |
|---|---|
| Same-Size Thread | The thread diameter matches the shoulder diameter, instead of the standard smaller-diameter thread — useful when the mounting hole and thread need to be the same size |
| Short-Thread | A shorter threaded section than standard, for use in thin mounting plates |
| Left-Hand Threaded | Reverse (left-hand) threads for counter-rotating assemblies |
| Internally Threaded Shoulders | A tapped hole in the end of the shoulder instead of an external thread, letting another screw mount into it — useful for stacking or joining parts through the shoulder itself |
Feature Variants
Thread-locking shoulder screws add a patch or coating to the threads to resist loosening under vibration. Screws with material certification include documentation of compliance with specific quality and material standards.
Need a Custom Shoulder Screw?
Don't see the material, shoulder diameter, or length you need? Our team can cross-reference an existing part or quote a custom configuration. Request a Quote or Contact Us. LILY Bearing also offers customized fastener services.
Frequently Asked Questions
What is the difference between a shoulder screw and a regular bolt?
A regular bolt is threaded along most or all of its length, and the threads themselves bear the clamping load. A shoulder screw has an unthreaded, precision-ground shoulder section between the head and a shorter, smaller-diameter threaded tail. The shoulder — not the threads — is the working diameter that bears the load, which makes shoulder screws well suited as pivot points, cam followers, and linear-motion guides where a smooth bearing surface is needed.
Why is a shoulder screw's thread smaller than its shoulder diameter?
The threaded tail only needs to be large enough to anchor the screw into a tapped hole — it doesn't carry the working load, so keeping it smaller than the shoulder makes the tapped hole easier to machine and leaves the shoulder as a clean, unbroken bearing surface. If your application requires the thread and shoulder to be the same diameter, LILY Bearing also stocks same-size-thread shoulder screws.
