Strippers, Reamer Bolts

Strippers, Reamers and Shoulder Bolts

Strippers, reamers and shoulder bolts are bolts with a head, cylindrical body, and stepped thread. As they are used for stripper plates, they are called stripper bolts; because the stepped thread part has a shoulder, they are also known as shoulder bolts. Additionally, since they feature a highly accurate body that can be aligned with a reamer hole for positioning and high-load applications, they are referred to as reamer bolts. These products are available in a wide range of shapes, sizes, materials, hardness levels, and surface processing options.

Key Characteristics

• Stepped Shaft Design
  The precision-ground cylindrical body ensures accurate alignment and stable load support.
• High Positional Accuracy
  Designed to fit reamed holes tightly, making them ideal for positioning, guiding, and repeated sliding motion.
• High Load Capacity
  The shoulder section absorbs shear loads, reducing stress on threaded portions.

Multiple Naming by Function

• Stripper bolt: Used in stripper plates of press dies
• Shoulder bolt: Named after the stepped shoulder structure
• Reamer bolt: Used for precise positioning in reamed holes

Materials and Surface Treatments

Materials Available

• Carbon steel
• Alloy steel
• Stainless steel (for corrosion resistance)

Surface Processing Options

• Black oxide
• Nickel plating
• Chrome plating
• Other anti-corrosion or wear-resistant treatments

Hardness Variations

Suitable hardness grades are available depending on load, wear, and impact requirements.

Typical Applications

• Press dies and stripper plates
• Mold alignment and positioning
• Guide mechanisms and sliding components
• High-load fastening where shear strength is critical
• Jigs, fixtures, and precision assemblies