Introduction for Component: 21000-28-05-15-050-03-02
This component is a precision-engineered guide pillar or guide pin, typically used in mold making and high-precision tooling systems. The alphanumeric code is a structured part number that defines its key specifications. Its primary function is to ensure accurate alignment and smooth, wear-resistant guiding between two mating components, such as the moving and fixed halves of a plastic injection mold or a precision stamping die. It is manufactured from high-grade tool steel, hardened and ground to exacting tolerances, and often features a super-finished surface for optimal performance.
Technical Parameters & Specifications
The part number 21000-28-05-15-050-03-02 can be decoded as follows, with the critical dimensions and weight summarized in the table below.
| Parameter | Specification | Notes / Unit |
|---|---|---|
| Part Number | 21000-28-05-15-050-03-02 | Standardized coding system |
| Nominal Diameter | 28 mm | Critical guiding dimension |
| Head Diameter | 38 mm (approx.) | Typically 8-10mm larger than shank |
| Total Length (L) | 150 mm | Overall pin length |
| Guiding Length (l) | 100 mm | Precision-ground section |
| Head Height (h) | 15 mm | Height of the mounting head |
| Material | High-Carbon Chrome Steel (e.g., SUJ2) | Hardened to 58-60 HRC |
| Surface Finish | Super-finished / Polished | For smooth operation & low friction |
| Weight (Approx.) | ~0.73 kg | Calculated based on steel density (7.85 g/cm³) |
| Tolerance | g6 or h5 | Standard precision fit for guide pillars |
| Hardness | 58-60 HRC | Core hardness for wear resistance |
Note on Weight: The calculated weight is an approximation based on cylindrical geometry. Actual weight may vary slightly due to chamfers, oil grooves (if specified by the -03-02 suffix), and material density variations.
Application Scenarios
This guide pillar is designed for robust, medium-to-large-scale precision applications:
Injection Molding Molds: The primary application. It ensures perfect alignment between the mold core and cavity, preventing damage to delicate mold components and ensuring consistent product quality in high-volume production cycles.
Stamping and Progressive Dies: Used in metal forming dies to precisely guide the upper and lower die sets, ensuring accurate part stamping, prolonging die life, and preventing punch breakage.
Precision Jigs and Fixtures: Employed in assembly or machining fixtures where repeatable, accurate positioning of workpieces or tooling components is critical.
Automation and Machinery: Can serve as a durable linear guide component in custom-built automation equipment, special-purpose machines, or press brakes where high radial loads are present.
General Tooling and Alignment: Any industrial application requiring a hardened, wear-resistant shaft for aligning two plates or components that undergo frequent separation and engagement.
The suffix 03-02 often indicates specific design details, such as the type of lubrication (e.g., oil grooves) and the head style (e.g., with a threaded hole for extraction), making it suitable for automated or maintenance-friendly tooling systems.
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