Socket Shoulder Screw Dimensions and Uses
By Mutual Screw & Supply | Published: 2026-10-18
Category: Buying Guides
Learn how to select the right socket shoulder screw by understanding key dimensions like shoulder diameter and length. This guide covers the Holo-Krome 5/8" shoulder screw and its applications.
Quick Answer
Choose a socket shoulder screw based on the shoulder diameter and length needed for your pivot, axle, or bearing surface. The Holo-Krome 08110 5/8" x 2-1/2" socket shoulder screw is a common choice for applications requiring a precision ground shoulder in alloy steel with a black oxide finish.
Why Shoulder Dimensions Matter
The shoulder of a socket shoulder screw is the precision-ground cylindrical section between the head and the threads. It acts as a pivot, axle, or bearing surface, so its diameter and length must match the mating component or housing. Using a shoulder that is too small can cause play or wear, while one that is too large may not fit the bore.
The shoulder diameter is the most critical dimension. It must be matched to the inner diameter of the bearing or the hole in the mating part. The shoulder length determines how much of the screw is available for the bearing surface and must be sufficient to support the load without bottoming out.
Material and Finish Considerations
Alloy steel with a thermal black oxide finish, as seen on the Holo-Krome 08110, offers good corrosion resistance and a non-reflective surface. The black oxide also provides some lubricity, which can help during installation. However, for highly corrosive environments, stainless steel or other coatings may be more suitable.
The precision ground shoulder ensures a consistent fit. This is important for applications where the shoulder rotates or slides against another part. A ground shoulder reduces friction and wear compared to an as-rolled or unground surface.
Decision Rules for Socket Shoulder Screws
- Match Shoulder Diameter to Bore: Measure the inner diameter of the bearing or housing. The shoulder diameter should be a close slip fit or slight interference fit, depending on the application. For the Holo-Krome 08110, the shoulder diameter is 5/8".
- Confirm Shoulder Length Sufficient: The shoulder length must be long enough to fully support the bearing surface without the screw bottoming out. The Holo-Krome 08110 has a shoulder length of 2-1/2", which is suitable for many applications requiring a long bearing surface. Check that the shoulder length is at least as long as the bearing surface depth.
- Select Drive Type for Assembly: Socket drive (hex) allows for high torque application with a hex key or bit. This is common for shoulder screws that need to be tightened securely. Ensure the drive size matches your tooling.
Product Facts
- HOLO-KROME 08110 5/8" X 2-1/2" Socket Shoulder Screws | Socket Head | Socket Drive | Alloy Steel Thermal Black Oxide (25 / Pkg.): The Holo-Krome 08110 is a 5/8" x 2-1/2" socket shoulder screw with a hex socket drive, precision ground shoulder, and alloy steel thermal black oxide construction. It is made in the USA. The precision ground shoulder provides a reliable bearing surface for pivot or axle applications, and the black oxide finish offers moderate corrosion protection and a consistent appearance.
HOLO-KROME 08110 5/8" X 2-1/2" Socket Shoulder Screws | Socket Head | Socket Drive | Alloy Steel Thermal Black Oxide (25 / Pkg.)
Who Should Use This Screw
Best For
- Applications requiring a precision ground shoulder for a pivot, axle, or bearing surface
- Projects where a 5/8" shoulder diameter and 2-1/2" shoulder length are needed
- Users who prefer a hex socket drive for secure installation
Not For
- Highly corrosive environments where stainless steel or other coatings are necessary
- Applications where the shoulder diameter or length does not match the mating component
