Introduction for Component: 31000-28-05-00-024-03-02
This component is a guide bush or guide bushing, designed as the matching counterpart to a guide pillar (such as the 21000-series). It is a critical element in precision tooling systems, providing a hardened and precisely machined bore for a guide pin to travel within. The part number follows a standardized system where the initial "31" typically denotes a straight (non-flanged) guide bush. Its function is to absorb radial forces, ensure frictionless linear movement, and maintain perfect alignment between mold plates or die sets, thereby protecting the entire tooling assembly from misalignment and wear.
Technical Parameters & Specifications
The part number 31000-28-05-00-024-03-02 is decoded into its key specifications below. The primary difference from a guide pillar is its hollow cylindrical form.
| Parameter | Specification | Notes / Unit |
|---|---|---|
| Part Number | 31000-28-05-00-024-03-02 | Standardized coding for straight bushings |
| Nominal Bore Diameter | 28 mm | Matches a 28mm guide pillar (e.g., 21000-28-...) |
| Outer Diameter (D) | 38 mm | Standard press-fit diameter for mounting |
| Total Length (L) | 50 mm | Overall length of the bushing |
| Effective Guiding Length | 24 mm | Length of the precision-ground internal bore |
| Material | High-Carbon Chrome Steel (e.g., SUJ2) | Hardened to 58-60 HRC |
| Surface Finish (Bore) | Super-finished / Honed | Ultra-smooth for minimal friction and wear |
| Weight (Approx.) | ~0.29 kg | Calculated based on steel density (7.85 g/cm³) and hollow cylindrical geometry. |
| Bore Tolerance | H7 | Standard precision fit for guide bushings (clearance fit with g6 pillar). |
| Hardness | 58-60 HRC | Matches the hardness of the mating guide pillar. |
| Mounting Type | Press Fit | The outer diameter is designed for an interference fit into a machined housing plate. |
Note on Weight: The weight is an approximation. The suffix 03-02 may indicate specific internal features like spiral oil grooves or a specific chamfer style, which would cause a negligible variation in the final weight.
Application Scenarios
This guide bush is applied in conjunction with a corresponding guide pillar in systems requiring precise linear guidance:
Mold Bases (Injection Molds, Die-Casting Molds): Pressed into the fixed half (cavity plate) or moving half (core plate) of a mold to receive the guide pillar from the opposite plate. This is its most common application, critical for daily mold operation.
Precision Stamping Dies: Installed in the die shoe (lower half) to guide the posts mounted on the punch shoe (upper half), ensuring accurate hit every stroke and prolonging die life.
Jigs and Fixtures for Machining: Used in milling or drilling fixtures where a part or a sub-fixture must be accurately located and guided into position repeatedly.
Indexing and Positioning Units: Incorporated into rotary indexing tables or linear sliding units as a durable, high-load-bearing bearing/sleeve component.
General Machinery Alignment: Serves as a robust sleeve bearing in custom machinery where a hardened, wear-resistant interface is needed between a rotating or sliding shaft and its housing.
Key System Function: The 28mm nominal bore of this bush (31000-28-...) is designed to create a precise H7/g6 clearance fit with a 28mm guide pillar (21000-28-...). This combination guarantees smooth movement while eliminating play, making the 31000-28-05-00-024-03-02 an essential component for durable and reliable precision tooling.
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