Overview
Shoulder bolts, also known as stripper bolts, are precision-engineered fasteners designed to provide a smooth, cylindrical bearing surface between the bolt head and the threaded portion. These bolts feature a distinct unthreaded shoulder that allows for rotation or sliding of attached components, making them ideal for applications requiring accurate alignment and movement. Manufactured from high-grade materials such as alloy steel, stainless steel, or brass, shoulder bolts undergo stringent machining processes to ensure tight tolerances and consistent performance. Their design includes a hex or socket head for secure fastening, and the shoulder diameter and length are carefully controlled to meet specific engineering requirements. The combination of strength, durability, and precision makes shoulder bolts essential in industries like automotive, aerospace, and machinery manufacturing where reliable mechanical function is critical.
In addition to their structural advantages, shoulder bolts offer versatility in assembly and maintenance due to their ability to act as pivot points, shafts, or guides within mechanical systems. The smooth shoulder reduces wear on moving parts and minimizes friction, enhancing the longevity of the assembly. These bolts are often used in die sets, pulleys, and linkages where precise movement is necessary. The choice of materials and heat treatment processes further enhances corrosion resistance and load-bearing capacity, ensuring optimal performance under demanding conditions. Shoulder bolts provide a combination of strength, precision, and adaptability that supports complex mechanical designs, making them a preferred fastener in high-performance industrial applications requiring both stability and flexibility.
| Product Type | Shoulder Bolts |
| Head Style | Hexagonal Head |
| Manufacturing Process | Cold Forging and Machining |
| Thread Type | Unified National Coarse (UNC) or Unified National Fine (UNF) |
| Common Materials | Alloy Steel, Stainless Steel, Carbon Steel |
| Available Sizes | Shoulder Diameters from 1/8″ to 1″, Lengths from 1/4″ to 6″ |
| Strength Features | High Tensile Strength, Precision Ground Shoulder for Accurate Alignment |
| Typical Applications | Mechanical Assemblies, Pivot Points, Die Sets, Machinery Components |
| Surface Finishes | Zinc Plating, Black Oxide, Phosphate Coating, Passivation |
| Standards | ASME B18.3, DIN 650 |
| Customization | Custom Sizes, Materials, Threads & Surface Finishes Available |
Ensures accurate alignment and smooth rotational movement in mechanical assemblies requiring tight tolerances.
Available in alloy and stainless steels to provide excellent tensile strength and durability under stress.
Stainless steel options offer resistance to rust and corrosion, suitable for harsh environments.
Ideal for use in automotive, aerospace, and industrial machinery where precise shafting is critical.
Manufactured with fine surface finishes to reduce friction and wear during operation.
Produced to strict tolerances for consistent performance in precision assemblies.
| Product Type | Shoulder Bolt (Shoulder Screw) |
| Thread Type | Metric Coarse Thread |
| Diameter Range | M3 to M30 |
| Length Range | 10 mm to 150 mm |
| Available Materials | Stainless Steel, Carbon Steel, Alloy Steel |
| Manufacturing Standards | ASTM F835, ISO 7379 |
| Surface Finish | Plain, Zinc Plated, Black Oxide |
| Diameter (mm) | Shoulder Length (mm) | Thread Length (mm) |
|---|---|---|
| M3 | 6–20 | 6–15 |
| M6 | 10–50 | 10–40 |
| M10 | 15–75 | 15–60 |
| M20 | 30–100 | 30–90 |
