Guide Shaft Precision Dowel Pin
Product Overview
The Guide Shaft Precision Dowel Pin is a high-precision cylindrical shaft used for positioning, guiding, and aligning mechanical components with extreme accuracy. It serves as a fixed reference in mechanical assemblies, molds, dies, and machinery parts where tight tolerances and repeatability are critical.
These dowel pins are manufactured from hardened stainless steel, alloy steel, or tool steel, and undergo precision grinding to ensure dimensional accuracy, straightness, and surface finish. They often function as both guide shafts and positioning pins, combining rigidity, precision, and durability in compact forms.
Key Features
High Dimensional Accuracy: Tolerance typically within ±0.002 mm
Excellent Straightness and Roundness: Ensures tight fit and precision alignment
Superior Surface Finish: Surface roughness Ra 0.2–0.4 μm for smooth assembly
High Hardness and Wear Resistance: Typically hardened to HRC 58–62
Corrosion Resistant Options: Available in SUS304, SUS316, or passivated finish
Customizable Ends: Flat, chamfered, tapped holes, center-drilled, threaded ends, etc.
Standard and Non-standard Sizes: Available from diameter 1.0mm to 20mm and above
Typical Applications
Precision Machinery
Fixture location pins in CNC machines
Guide shafts in linear motion systems
Dowels in assembly jigs and gauges
Molds & Dies
Alignment pins for plastic injection molds and metal stamping dies
Core and cavity alignment to prevent mismatch
Replaceable guide pins in mold base sets
Automation Equipment
Reference pins in pick-and-place machines, conveyors, and robotics
Sensor alignment and repeatable mounting positions
Structural parts for sliding or guided movements
Electronics & Consumer Goods
Alignment of precision assemblies in smartphones, laptops, wearables
Hinge shafts and mechanical pivot points
Precision pinning in small motors and gear systems
Manufacturing Process
Step 1: Material Selection
Common materials:
SUS303 / SUS304 / SUS316 – rust-resistant for cleanroom or humid environments
SKD11 / SUJ2 / 440C / 52100 – hardened tool steels for wear resistance
Titanium – lightweight and non-magnetic applications
Step 2: CNC Turning
Raw material is turned to near-net shape on high-precision CNC lathes
Rough machining defines length and diameter
Step 3: Centerless Grinding
Achieves final dimensions with ultra-high accuracy
Ensures surface roundness and precision for interference or slip fit
Step 4: Heat Treatment
Through-hardening or case hardening (carburizing/nitriding)
Increases surface hardness and wear resistance (HRC 58–62 typical)
Step 5: Surface Finishing
Polishing, passivation, or electropolishing for corrosion resistance
Black oxide or chrome plating available on request
Chamfering or tapering for easy insertion
Step 6: Final Inspection
Dimensional inspection using micrometers and CMM
Runout and straightness testing
Optional: ultrasonic flaw detection for critical applications
Our Advantages
Over 16 years of experience in precision shaft and dowel pin production
Full control of CNC machining, grinding, heat treatment, and finishing processes
Tight tolerance control for global customers in automotive, medical, and tooling industries
In-stock standard sizes and fast turnaround for custom orders
ISO9001-certified quality system, with full inspection reports available
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