Socket Shoulder Screw,

Material: Typically fabricated from 304 Stainless Steel or Alloy Steel (SCM435). Stainless steel offers excellent corrosion resistance and stability, while alloy steel (often heat-treated) provides superior tensile strength and hardness for heavy-duty applications.
Equipment: Precision CNC Lathes, Cold Heading Machines, and Thread Rolling Machines.

Mechanical Processing:
Cold Heading: The head and shoulder are often formed using precision cold heading for high strength and material integrity.
CNC Turning: The shoulder diameter and length are precision-ground or turned to achieve tight tolerances (typically h7 or h9).
Thread Rolling: Threads are formed by rolling rather than cutting to increase fatigue strength.
Post-Processing: Heat treatment (for alloy steel) to achieve required hardness (e.g., 40-45 HRC), followed by surface cleaning or passivation (for stainless steel).
Product Advantages

High Shear Strength: The unthreaded shoulder is designed to withstand significant lateral (shear) forces, making it much stronger than standard screws in pivot applications.
Precision Alignment: The tight tolerance on the shoulder diameter ensures precise centering and alignment of moving parts, such as stripper plates in molds.
Durability: The combination of high-grade metal and heat treatment ensures long service life even under repetitive stress and friction.

Use Scenarios
Mold & Die Industry: Widely used as stripper bolts in injection molds to control the movement and spacing of stripper plates.
Automation Machinery: Serving as precision pivot pins or axles for robotic arms, linkages, and conveyors.
Precision Instruments: Used in optical devices or measuring equipment where accurate spacing and rigid fastening are critical.
Automotive Assembly: Acting as a guide pin or locating bolt in engine components or chassis assembly.