Precision Dowel Pins

Overview

ORROMFG manufactures precision dowel pins and locating pins for assembly alignment, tooling positioning, and fixture locating applications. Our CNC turned dowel pins are produced from hardened tool steel, carbon steel, and stainless steel, with precision ground diameters to achieve the exact press-fit and slip-fit tolerances required for reliable positioning in mating components.

We produce standard and custom dowel pins in diameters from 1 mm to 25 mm and lengths up to 150 mm. Pins can be supplied with internal threads for extraction, tapered lead-ins for easy insertion, and chamfered or radiused ends per customer drawings. Hardened dowel pins are heat treated to HRC 55-60 and ground to final diameter for maximum wear resistance and dimensional stability.

These precision dowel pins are essential components in injection mold bases, fixture assemblies, machine tool alignment, and automotive positioning systems. For related precision fastening components, explore our Cold Forged Fasteners, or learn more about our CNC Machining capabilities.

Key Features

• Precision diameters — Ground to ±0.01 mm for accurate press-fit and slip-fit locating
• Hardened options — Heat treated to HRC 55-60 for wear resistance and long service life
• Custom configurations — Internal threads, tapers, grooves, and custom head shapes per drawing
• Material flexibility — Tool steel, carbon steel, and stainless steel for diverse environments
• Surface treatments — Black oxide, nitriding, and chrome plating for enhanced corrosion resistance

Materials

• SUJ2 (GCr15) Bearing Steel — Hardened and ground dowel pins for precision tooling applications
• AISI 1045 Carbon Steel — General-purpose dowel pins with optional case hardening
• AISI 4140 Alloy Steel — High-strength dowel pins for heavy-duty locating applications
• 304 / 316 Stainless Steel — Corrosion-resistant dowel pins for food, medical, and marine use
• SKD11 / D2 Tool Steel — High-hardness dowel pins for mold and die applications

Manufacturing Process

1. Material selection — Certified bar stock in tool steel, carbon steel, or stainless steel
2. CNC turning — Precision turning of pin body, chamfers, and any custom features
3. Thread machining — Internal thread tapping for extraction-type dowel pins
4. Heat treatment — Quenching and tempering to achieve HRC 55-60 for hardened pins
5. Centerless grinding — Precision grinding of pin diameter to final tolerance
6. Surface treatment — Black oxide, nitriding, or plating per customer specification
7. Inspection — Diameter verification, hardness testing, and visual inspection

For precision mold base assemblies using dowel pins, see our Precision Mold Base Plates.