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45# Tempered Steel Knurled Automation Positioning Pin Shaft Set
This batch of uniform cylindrical locating pins are precision CNC turned & knurled for mechanical automation equipment, equipped with top circumferential serrated knurling, axial vertical spline grooves and integrated flange mounting base. They serve as anti-slip positioning core pins for fixture clamping, product indexing and rotary station alignment on automated assembly lines.
- Material: 45# Tempered Carbon Steel
- Hardness: HRC 22–26
- Tolerance: ±0.002 mm
- Surface Finish: Uniform Fine Matte Grinding Finish
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Anti-Slip Knurled Indexing Pin Engineering
Dual anti-slip knurling structure delivers reliable friction locking during rotary positioning: dense circular serrated knurl on the top end prevents workpiece slip during high-speed indexing, vertical parallel spline grooves on the cylinder body boost fitting friction with fixture sleeves to eliminate rotational offset. Integrated bottom flange base realizes flat bolt mounting on fixture plates and rotary tooling platforms, ultra-tight coaxial tolerance ensures consistent indexing accuracy after millions of repeated rotation cycles.
Solid monolithic cylindrical shaft structure resists bending deformation under clamping radial load, maintaining stable indexing precision for long-term mass automated production.
Cost-Effective Tempered 45# Steel Construction
Tempered 45# carbon steel provides balanced performance for medium-load automation positioning pins:
- Moderate hardness and impact toughness, resistant to surface denting from frequent workpiece contact and clamping impact
- Excellent turning & knurling machinability, enabling uniform dense serrated and vertical spline grooves without burrs
- Stable dimensional consistency under workshop temperature fluctuation, low raw material cost for large-batch fixture spare parts
- Supports secondary surface hardening treatments to upgrade wear resistance for high-cycle production scenarios Ideal for medium-load indexing, clamping and rotary positioning stations in electronics, automotive and packaging automation equipment.
Custom Knurled Pin Machining Support
- Custom overall shaft length, knurl tooth density, spline groove quantity and flange outer diameter based on customer fixture CAD drawings
- Optional surface upgrades: Gas Nitriding, Hard Chrome Plating, Anti-Rust Black Oxide Coating, Mirror Polishing
- DFM positioning consultation: friction force optimization, knurl depth matching, flange mounting load balance design
- Fast single-piece prototype sampling and large-batch uniform pin mass delivery
Key Features & Advantages
- Dual Anti-Slip Knurling Design: Top circular serrations + body vertical splines double friction to avoid workpiece rotation slip during indexing.
- Integrated Flange Mounting Base: One-piece flange simplifies fixture installation, evenly distributes clamping pressure to prevent pin tilt.
- Ultra-High Coaxial Precision: Multi-axis turning ensures concentricity error ≤0.002mm for stable rotary indexing positioning.
- Cost-Effective Tempered Steel Material: Balanced rigidity and processing cost for mass fixture spare part replacement.
- Fully Customizable Knurl & Shaft Geometry: Adjust tooth pitch, groove depth and shaft diameter to match unique workpiece friction positioning demands.
Technical Specifications
| Parameter | Specification |
|---|---|
| Base Material | 45# Tempered Carbon Steel |
| Alternative Materials | 718H Mold Steel, SUS304 Stainless Steel, 40Cr Alloy Steel |
| Hardness | HRC 22–26 (As-tempered); HRC 48–52 (Post nitriding) |
| Dimensional Tolerance | ±0.002mm for shaft OD, knurl outer diameter & flange flatness |
| Coaxiality of Cylindrical Shaft | ≤0.002mm per 100mm shaft length |
| Surface Roughness | Ra ≤0.6μm matte ground finish |
| Manufacturing Processes | CNC Turning, Precision Knurling, Spline Milling, Flange Turning, Tempering Heat Treatment |
| Surface Treatments | Gas Nitriding, Black Oxide Anti-Rust Coating, Hard Chrome Plating |
| Customization | 100% Fully Customized via CAD Drawings & Workpiece Samples |
Applications
Consumer Electronics Rotary Assembly Lines
Knurled indexing pins for wireless earphone, charger shell rotary positioning stations. Dual anti-slip knurl structure fixes plastic electronic housings firmly without slip during multi-angle assembly and screw tightening.
Automotive Component Automated Fixtures
45# steel locating pin sets for automotive wiring terminal, plastic bracket rotary clamping jigs. Tempered steel withstands medium-load clamping impact, large-batch uniform pins reduce fixture maintenance cost for vehicle mass production lines.
Cosmetic Packaging Indexing Equipment
Anti-slip knurled pins for lipstick tube, cosmetic cap rotary printing and labeling stations. Uniform friction knurl prevents cosmetic packaging scratch and rotation offset during high-speed labeling cycles.
Food Packaging Conveying Automation
Nitrided surface variant pins for food container rotary sorting equipment, nitriding layer improves wear resistance and anti-rust performance against grease and water splash.
Precision Stamping Rotary Auxiliary Tooling
Flange base knurled pins for thin metal strip rotary indexing stamping machines, stable anti-deformation shaft body guarantees consistent strip positioning accuracy for continuous high-speed stamping production.
