SKD61 Flanged Multi-Step Guide Bushing (Black Nitride Coated)

High-Precision Engineering

Integrated flange mounting plate delivers stable bolt-locked positioning inside mold plates, eliminating axial shifting under impact loads. Segmented stepped structure matches multi-layer mold plate stacking heights for unified assembly depth. Nitride-coated sliding zones provide low-friction, scratch-resistant contact surfaces with mating guide posts, extending wear life drastically compared to uncoated steel. The thick solid steel wall provides high radial rigidity to resist oval deformation under heavy clamping and side pressure.

Heat-Resistant SKD61 Base Steel Performance

Premium SKD61 hot work steel forms the structural core with reliable high-temperature performance:

Excellent thermal shock and fatigue resistance for continuous high-temperature die casting and hot injection molding
Low thermal expansion coefficient to retain tight tolerance fit during cyclic heating and cooling
Balanced substrate hardness and impact toughness to avoid cracking from repeated mold collision loads
Strong bonding compatibility with ion nitriding coatings for durable surface reinforcement

Fully Customizable Structural Design

All dimensions and surface treatment schemes can be tailored to project requirements:

Custom flange diameter, mounting hole layout, step heights and overall length
Adjustable inner bore size to fit customer standard or custom guide posts
Flexible coating options: full nitriding, partial selective nitriding, TiN coating or plain ground finish
Modified wall thickness for light, medium or extreme heavy load working conditions

Key Features & Advantages

Selective Hardened Wear Zones: Nitride coating boosts sliding surface hardness while preserving tough SKD61 core for impact resistance.
Flange Bolted Stability: Secure flange mounting prevents axial movement under repeated mold impact.
High-Temperature Dimensional Stability: SKD61 substrate minimizes thermal expansion drift in hot molding workflows.
Long Cycle Wear Durability: Nitride layer reduces friction and abrasion, cutting component replacement frequency.

Technical Specifications

Parameter	Specification
Base Material	SKD61 Hot Work Tool Steel
Surface Treatment	Selective Ion Nitriding (Black Coating)
Substrate Hardness	HRC 48–52
Nitrided Surface Hardness	HRC 60–64
Critical Diameter Tolerance	±0.001mm
Full-Part Concentricity	≤0.002mm
Surface Roughness	Ra ≤0.04μm (Ground Bright Zones), Ra ≤0.05μm (Nitrided Zones)
Manufacturing Processes	CNC Turning, Cylindrical Grinding, Inner Honing, Hardening & Tempering, Selective Ion Nitriding
Customization	100% Supported via Drawings & Samples

Applications

Automotive Manufacturing

Used as flange guide components for automotive aluminum die casting molds and glass-filled plastic injection molds; SKD61 handles sustained high mold temperatures from metal casting and high-volume auto component production cycles.

Medical Molding Production

Applied in precision injection mold guide systems for rigid medical device housings and disposable plastic fittings; S136 material swap available for molding corrosive medical-grade PVC resins.

Consumer Electronics Mass Fabrication

Deployed in high-cycle injection molds for miniature electronic frames, connector shells and battery housing parts; stable concentric guiding maintains tight dimensional repeatability for tiny electronic molded geometries.

General Plastic Packaging

Ideal for high-speed packaging cap, container and food vessel mold guide assemblies; nitride low-friction surface supports non-stop fast-cycle packaging molding lines.

Industrial Automated Fixturing

Utilized as fixed-flange positioning guides on automated CNC clamping fixtures and assembly tooling, rigid stepped structure delivers repeatable precision for batch workpiece machining and assembly.