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Brass Dowel Pins
Brass Dowel Pins
Brass dowel pins are precision-machined cylindrical locating pins used for accurate component alignment, position fixing, and mechanical fastening in electrical panel assemblies, switchgear enclosures, terminal block bases, transformer cores, precision tooling, and electromechanical devices. Manufactured from CW614N free-cutting brass, CW102C leaded brass, and DZR brass CW602N, brass dowel pins offer non-magnetic, non-sparking, and corrosion-resistant locating capability. Electrical Accessories India manufactures precision brass dowel pins to IS 6688, DIN 6325, ISO 8734, and ASME B18.8.2 standards. Price: US$ 11.50/kg
Product Overview
Function of Dowel Pins in Electrical Assemblies
Brass dowel pins serve as precise locating elements between mating components, ensuring accurate and repeatable assembly alignment. In electrical panel manufacturing, dowel pins locate bus bar assemblies, DIN rail mounting frames, transformer lamination stacks, and switchgear component modules. Their non-magnetic property (brass vs. steel) prevents interference with magnetic components such as relay cores, transformer windings, and current transformer circuits. In connector tooling and mold tooling, brass dowel pins maintain die alignment across production cycles.
Types of Brass Dowel Pins
Solid cylindrical dowel pins (chamfered ends) are the most common form, available in h6 and m6 interference fit tolerances per ISO 8734. Knurled brass dowel pins with diamond or straight knurling provide press-fit retention in blind holes without adhesive. Grooved drive pins have longitudinal grooves that allow air escape during insertion and prevent hydraulic lock. Slotted spring pins (split pins) are hollow cylindrical spring-steel or brass pins that compress during insertion, providing self-locking retention. Taper dowel pins with 1:50 taper per ISO 8737 provide adjustable alignment and easy removal for maintenance.
Dimensional Standards and Tolerances
Brass dowel pins are manufactured to ISO 8734 (solid dowel pins, tolerance m6), ISO 8735 (dowel pins with internal thread), and DIN 6325 tolerances. Pin diameters from 1 mm to 25 mm, lengths from 4 mm to 100 mm. Diameter tolerance per ISO 8734: h6 (sliding fit) for through-hole location; m6 (interference fit) for press-fit retention. Roundness within 0.003 mm, straightness within 0.005 mm per 100 mm length, surface roughness Ra ≤ 0.4 µm per ISO 1302.
Non-Magnetic and Non-Sparking Properties
Brass dowel pins are inherently non-magnetic (relative magnetic permeability µr ≈ 1.0) making them suitable for use near magnetic components in transformers, motors, generators, and sensitive measurement instruments. In potentially explosive atmospheres (ATEX Zone 1 and Zone 2), brass is a non-sparking material per EN 13463-1 and IEC 60079 series, allowing use in oil and gas, chemical, and mining electrical installations without spark ignition risk.
Corrosion Resistance
Brass dowel pins resist atmospheric oxidation, mild acids, alkalis, and petroleum-based lubricants. DZR brass (CW602N) variants resist dezincification in high-zinc-leaching environments such as coastal and marine electrical installations. Nickel-plated brass dowel pins provide enhanced resistance to salt fog (500 hours NSS per IEC 60068-2-11) and industrial chemicals. Hard chrome plating is available for brass dowel pins requiring wear resistance on sliding contact surfaces.
Applications in PCB and Connector Tooling
Precision brass dowel pins locate PCB panels in SMD assembly fixtures, wave solder pallets, and reflow oven carriers, ensuring ±0.02 mm placement accuracy of PCB assembly panels. In injection mold tooling for connector housings, brass dowel pins align cavity and core halves with ±0.005 mm precision. Related components used with brass dowel pins include Brass Solid Pins, Brass Hollow Pins, Brass Terminal Pins, and Brass Plug Pins for complete panel and connector assembly systems.
Key Features
- Diameter tolerance to ISO 8734 h6/m6 (±0.003–0.005 mm)
- Diameters: 1 mm – 25 mm; Lengths: 4 mm – 100 mm
- Non-magnetic (µr ≈ 1.0) and non-sparking (ATEX compatible)
- DZR brass variant for marine and corrosive environments
- Nickel, chrome, and bare brass finish options
- Taper dowel pins per ISO 8737 for adjustable location
- Thread versions (ISO 8735) for extractable dowel pins
- Surface roughness Ra ≤ 0.4 µm
Precision Machined Tolerances
All brass dowel pins are ground on cylindrical grinders to achieve dimensional tolerances tighter than standard turning. Roundness control within 0.003 mm ensures consistent fit in location holes. Surface finish Ra ≤ 0.4 µm minimizes fretting wear in repeated assembly/disassembly applications.
ATEX and Non-Sparking Applications
Brass dowel pins meet ATEX Directive 2014/34/EU non-sparking material requirements for use in Zone 1 and Zone 2 explosive atmospheres. Applicable to electrical installations in oil refineries, chemical plants, offshore platforms, and mining installations per IEC 60079-14.
Knurled Retention Dowels
Knurled brass dowel pins with diamond knurling pattern provide 3–5× higher push-out force than smooth press-fit pins in aluminum and plastic housings, enabling secure installation in soft materials without adhesive or retaining compound.
Threaded Dowel Pins (ISO 8735)
Internally threaded brass dowel pins (ISO 8735 Type A) allow extraction using threaded puller tools, enabling non-destructive disassembly of precision assemblies for maintenance and calibration. Threads M2 to M12 internal thread, full-length or partial thread configurations.
Standard Dimensions Summary
Brass dowel pins are available from stock in 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, and 16 mm diameter in lengths from 6 mm to 80 mm per ISO 8734 dimensional tables. Non-standard lengths and diameters manufactured per customer drawing.
Technical Specifications
| Parameter | Specification |
|---|---|
| Diameter Range | 1 mm – 25 mm |
| Length Range | 4 mm – 100 mm |
| Diameter Tolerance | h6 (sliding) or m6 (interference) per ISO 8734 |
| Roundness | <0.003 mm TIR |
| Straightness | <0.005 mm per 100 mm |
| Surface Roughness | Ra ≤ 0.4 µm per ISO 1302 |
| Chamfer (standard) | 0.3 mm × 30° both ends |
| Material | Brass CW614N / CW602N (DZR) / CW102C |
| Finish | Natural / Nickel plated / Hard chrome |
| Operating Temp. | -40°C to +200°C |
| Magnetic Permeability | µr ≈ 1.0 (non-magnetic) |
| Price | US$ 11.50/kg |
Material Grade Equivalents
| Material | EN | ASTM | BS | DIN | India IS |
|---|---|---|---|---|---|
| Free-Cutting Brass | CW614N | C36000 | CZ121 | CuZn39Pb3 | IS 319 |
| DZR Brass | CW602N | C35300 | CZ132 | CuZn36Pb2As | — |
| Leaded Brass | CW102C | C31400 | CZ118 | CuZn38Pb1.5 | — |
Product Types
| Type | Standard | Application |
|---|---|---|
| Solid Cylindrical Dowel | ISO 8734 | General alignment, press-fit location |
| Threaded Dowel Pin | ISO 8735 | Extractable precision alignment |
| Taper Dowel Pin | ISO 8737 (1:50) | Adjustable/removable alignment |
| Knurled Dowel Pin | Custom | Press-fit in soft materials |
| Slotted Drive Pin | ISO 8739 | Quick-fit retention with air escape |
| DZR Dowel Pin | Custom | Marine and corrosive environments |
Applications by Industry
| Industry | Application |
|---|---|
| Switchgear / Panel Manufacturing | Bus bar alignment, enclosure assembly location |
| Transformer Manufacturing | Core lamination alignment, non-magnetic requirement |
| PCB Assembly / EMS | SMD fixture, wave solder pallet, AOI fixture location |
| Connector / Tooling Mfg. | Injection mold cavity alignment, die location |
| Precision Instruments | Metrology equipment, calibration jig alignment |
| Oil & Gas / ATEX | Non-sparking mechanical assembly in hazardous areas |
| Marine / Offshore | Corrosion-resistant panel assembly in salt environments |
Manufacturing Process
Brass dowel pins begin as precision-drawn or turned brass rods meeting EN 12164 dimensional tolerances. Rods are centerless ground on precision cylindrical grinders with diamond dressing wheels, achieving diameter tolerances within ±0.003 mm and surface roughness Ra ≤ 0.4 µm. Both ends are chamfered using CNC chamfering machines per drawing specification. Thread versions are threaded on CNC lathes with verified thread form and pitch accuracy. All dimensions are checked using high-accuracy air gauges, CMM measurement, and surface profilometers. 100% dimensional inspection is performed on precision-tolerance lots.
Quality Standards
| Standard | Scope |
|---|---|
| ISO 9001:2015 | Quality Management System |
| ISO 8734 | Solid cylindrical dowel pins, tolerance m6 |
| ISO 8735 | Threaded dowel pins with internal thread |
| DIN 6325 | Precision cylindrical pins, hardened and ground |
| ASME B18.8.2 | Taper pins and dowel pins (US standard) |
| EN 13463-1 | Non-electric equipment for explosive atmospheres |
| RoHS 2011/65/EU | Hazardous substances restriction |
Why Choose Electrical Accessories India
- Centerless grinding capability for ±0.003 mm diameter tolerances
- Non-magnetic brass (µr ≈ 1.0) confirmed by magnetic permeability testing
- ATEX-compatible non-sparking brass material certified
- Full dimensional inspection with CMM and air gauge measurement
- ISO 9001:2015 certified; export to precision engineering industries worldwide
- Competitive pricing at US$ 11.50/kg
FAQ – Brass Dowel Pins
Q1. What tolerance do you supply for brass dowel pins?
Standard tolerances are h6 (sliding/clearance fit) and m6 (interference/press fit) per ISO 8734. Custom tolerances per drawing are available.
Q2. Why use brass dowel pins instead of steel?
Brass dowel pins are non-magnetic, non-sparking, and corrosion-resistant — important for transformer assemblies, ATEX hazardous areas, and marine environments where steel pins would be unsuitable.
Q3. What is the smallest brass dowel pin you manufacture?
We manufacture brass dowel pins from 1 mm diameter. Sub-millimeter brass pins are also available per customer specification.
Q4. Do you supply threaded dowel pins for extraction?
Yes. ISO 8735 Type A brass dowel pins with internal thread M2–M12 are available for extractable alignment applications.
Q5. Can brass dowel pins be used in ATEX Zone 1 areas?
Yes. Brass is a non-sparking material per EN 13463-1 and is approved for use in ATEX Zone 1 and Zone 2 explosive atmospheres.
Q6. What surface roughness do your dowel pins achieve?
Standard centerless-ground finish achieves Ra ≤ 0.4 µm. Super-finished Ra ≤ 0.1 µm available for precision metrology applications.
Q7. What is the operating temperature range?
Brass dowel pins operate from -40°C to +200°C without significant dimensional change. For higher temperatures, nickel or chrome-plated variants are recommended.
Q8. Do you offer custom lengths and diameters?
Yes. Any diameter from 1 mm to 25 mm and length from 4 mm to 100 mm is available. Longer or larger pins per customer drawing at tooling charge.
International Terminology
| Language | Term 1 | Term 2 | Term 3 |
|---|---|---|---|
| Spanish | Pasadores de guía de latón | Pines de alineación de latón | Pasadores de localización latón |
| Russian | Латунные штифты для выравнивания | Направляющие штифты латунь | Фиксирующие штыри из латуни |
| French | Goupilles de guidage en laiton | Broches de localisation laiton | Goupilles d’alignement laiton |
| Portuguese | Pinos de alinhamento de latão | Pinos de localização latão | Pinos de guia de latão |
| Italian | Spine di posizionamento in ottone | Perni di allineamento ottone | Spine di guida ottone |
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Request a Quote
📧 Email: sales@elecaccs.com | 📞 Phone: +91-22-43449300
📍 Plot 10, GIDC Industrial Estate, Jamnagar 361004, India