Ejector Guide Pins - Overview

This document provides detailed specifications for two types of ejector guide pins used in mechanical tooling: the Straight Type with Tap (EGPA series) and the Straight Type with Tapped Hole / Dowel Hole (EGPB series). Both types are precision components designed for guiding ejector pins in molds and dies.

1. EGPA Series - Straight Type (With Tap)

• Material: SUJ2 (equivalent to AISI 52100 bearing steel)
• Hardness: Induction hardened to HRC 58 or more
• Design Features: Straight pins with threaded tap holes (M10 or M12) for mounting
• Dimensions: Diameter (D) options: 25, 30, 35, 40, 50, 60 mm
• Length (L): Available in increments of 5 mm, ranging from 50 mm up to 450 mm depending on diameter
• Tolerances: Diameter tolerance f6 with specific negative deviations (e.g., -0.020 to -0.049 mm depending on size)
• Thread Depth: M10 depth 20 mm, M12 depth 25 mm
• Catalog Numbers: EGPA followed by diameter and length (e.g., EGPA 25-200)

2. EGPB Series - Straight Type (With Tapped Hole / Dowel Hole)

• Material: SUJ2 (AISI 52100)
• Hardness: Induction hardened to HRC 58 or more
• Design Features: Straight pins with both tapped holes and dowel holes for precise alignment
• Dimensions: Diameter (D) options: 25, 30, 35, 40, 50, 60 mm
• Length (L): Available in increments of 5 mm, ranging from 50 mm up to 450 mm depending on diameter
• Tolerances: Diameter tolerance f6 with negative deviations similar to EGPA; dowel hole diameter tolerance H7 with recommended dowel pin sizes
• Thread Depth: M10 depth 20 mm, M12 depth 25 mm
• Dowel Hole: Diameter d with H7 tolerance, recommended dowel pin sizes provided (e.g., 10×40, 16×50)
• Catalog Numbers: EGPB followed by diameter and length (e.g., EGPB 30-250)

3. Key Specifications and Parameters

• Material Quality: SUJ2 bearing steel ensures high wear resistance and durability.
• Hardness: Induction hardened surface with minimum HRC 58 for long service life.
• Tolerances: Tight diameter tolerances (f6) ensure precise fit and smooth operation.
• Thread and Dowel Hole Details: Thread depths and dowel hole sizes are standardized for compatibility with common mounting hardware.
• Length Variability: Lengths offered in 5 mm increments allow customization for specific tooling requirements.

4. Recommendations and Usage Notes

• Selection of diameter and length should be based on mold design and ejector system requirements.
• Ensure proper matching of dowel pins with dowel holes (H7 tolerance) for accurate alignment.
• Use the specified catalog numbers when ordering to guarantee correct dimensions and features.
• Material and hardness specifications must be adhered to for optimal performance and durability.

5. Summary of Tables and Dimensions

The document includes detailed tables listing available diameters, lengths, tolerances, thread depths, and catalog numbers for both EGPA and EGPB series. Length ranges vary by diameter, with maximum lengths up to 450 mm. Negative tolerance values for diameter are specified to ensure precision fit. Thread sizes are M10 or M12 with specified depths. Dowel hole sizes and recommended dowel pins are provided for EGPB series.

Overall, this technical document serves as a comprehensive reference for selecting and ordering ejector guide pins with precise mechanical specifications for tooling applications.