DIN 6325 Dowel Pins – Dimensions, Tolerances & Material Specifications
| Item | Specification |
|---|---|
| Standard Title | Parallel pins (DIN 6325‑1971, obsolete) |
| Nominal Diameter d Range | φ0.8 ~ φ20 (0.8,1,1.5,2,2.5,3,4,5,6,8,10,12,14,16,20) |
| Diameter Tolerance m6 | Max:0.808‑20.021;Min:0.802‑20.008 |
| Length Tolerance (JS14) | 6＜L≤10: ±0.1810＜L≤18: ±0.21518＜L≤30: ±0.2630＜L≤50: ±0.3150＜L≤80: ±0.3780＜L≤120: ±0.435 |
| Surface Roughness | Rt 4 |
| Material & Hardness | Steel, tensile strength ≥600 N/mm², quenched; hardness 60 ±2 HRC |
| Important Remark | Standard superseded by DIN EN ISO 8734‑2019 |
- Precision Ground Diameter
After heat treatment, the pin is precision ground to achieve the specified finished diameter. Controlled grinding stock and finishing parameters help maintain a stable diameter throughout the production batch.
- Roundness & Cylindricity Control
Grinding is controlled to limit radial variation and geometric deviation along the pin length, supporting uniform contact between the dowel pin and the mating bore.
- Surface Roughness Control
Fine grinding produces a controlled cylindrical surface suitable for precision locating applications. Surface roughness is checked according to the specified drawing or quality requirements.
- Consistent Finished Dimensions
Final grinding and dimensional inspection work together to control diameter, length, and geometric accuracy, helping maintain repeatable positioning performance from batch to batch.
Hardened Ground Dowel Pins DIN 6325 – Precision Fit & Tolerance Requirements
- Controlled Interference Fit
DIN 6325 hardened ground dowel pins are designed for precision locating applications where a controlled interference fit is required. Pin diameter and mating-hole size should be specified as a matched fit to achieve the required installation force and retention.
- Precision Hole Preparation
The mating bore should be machined to the specified diameter, roundness, and cylindricity before installation. Proper hole preparation ensures uniform contact with the DIN 6325 dowel pin and helps maintain positioning accuracy during assembly.
- Application-Specific Fit Selection
The appropriate pin tolerance and hole fit depend on the assembly design, installation method, and required positioning accuracy. Anhui Pins as a DIN 6325 dowel pin manufacturer in China, can review customer drawings and specifications to recommend the suitable fit.
- Custom OEM/ODM Fit Solutions
As a direct dowel pin factory in China, Anhui Pins Metal Products Co., Ltd. provides custom DIN 6325 hardened ground dowel pins for OEM/ODM applications. Custom dimensions, tolerances, materials, and production specifications can be manufactured according to customer drawings for bulk and recurring orders.
Manufacturing Process for Hardened Ground Dowel Pins DIN 6325
Cold Heading
Precision cold heading forms the basic pin geometry with controlled material flow and consistent dimensions. The process provides a stable starting profile for subsequent heat treatment and grinding operations.
Heat Treatment
The formed pins undergo controlled hardening to achieve the specified hardness and wear resistance. Process parameters are monitored to obtain consistent metallurgical properties while limiting dimensional distortion before precision grinding.
Precision Grinding
After heat treatment, the pins are centerless ground to the required finished diameter. Grinding controls diameter tolerance, roundness, cylindricity, and surface finish to achieve the precision fit required for DIN 6325 locating applications.
Surface Treatment & Finishing
The finished pins can be supplied with protective oil or specified surface treatments according to application requirements. Final finishing removes processing residues and prepares the parts for inspection, packaging, and shipment.
Applications of Hardened Ground Dowel Pins DIN 6325
Precision Machinery
Used for accurate alignment of machine components, housings, plates, and mechanical subassemblies where repeatable positioning is required.
Dies & Molds
Applied to locate mold plates, die components, and tooling elements, helping maintain accurate alignment during assembly and repeated production cycles.
Automotive Components
Used for positioning transmission parts, engine components, brackets, housings, and other assemblies requiring precise component alignment.
Jigs & Fixtures
Used as precision locating elements in machining fixtures, assembly tooling, and inspection equipment where consistent component positioning is essential.
Hardened Ground Dowel Pins DIN 6325 Manufacturer
Anhui Pins Metal Products Co., Ltd. manufactures DIN 6325 hardened ground dowel pins for precision positioning and mechanical assembly applications. Our production system covers cold heading, heat treatment, precision grinding, surface finishing, and quality inspection, allowing key dimensional and material characteristics to be controlled throughout the manufacturing process.
We support standard and custom dowel pin production based on customer drawings, technical specifications, or samples. With capabilities for custom sizes, material options, tolerance requirements, and OEM packaging, we provide DIN 6325 dowel pins from China for OEM projects, industrial manufacturers, and long-term bulk supply programs.
Custom DIN 6325 Hardened Ground Dowel Pins
Non-Standard Diameter & Length
Custom pin diameters and lengths can be manufactured when standard DIN 6325 sizes do not match the existing assembly. Diameter and length are produced according to customer drawings or specified dimensional requirements.
Tight Diameter Tolerance
For precision locating applications, the finished diameter tolerance can be controlled according to the required pin-to-hole fit. Custom tolerance requirements can be reviewed based on the mating bore and required installation condition.
Custom Material & Hardness
Material grade and hardness can be specified according to the application. Different mechanical property requirements can be accommodated for applications requiring higher wear resistance, strength, or dimensional stability.
Drawing-Based End & Surface Requirements
Chamfer dimensions, end geometry, surface roughness, protective finish, and other drawing-specific requirements can be incorporated into production. Anhui Pins supports custom DIN 6325 OEM/ODM production based on customer drawings and samples.
FAQ
When should I choose a hardened ground dowel pin instead of an unhardened pin?
A hardened ground design is more suitable when the assembly requires wear resistance, repeatable positioning, and stable dimensional performance over repeated assembly or service cycles.
Can DIN 6325 dowel pins be used in removable assemblies?
Yes, depending on the selected pin-to-hole fit and assembly design. If components need to be separated periodically, the fit and installation method should be selected to avoid excessive removal force or damage to the mating bore.
How do I select the correct DIN 6325 pin size for an existing hole?
The existing bore diameter, tolerance, roundness, depth, and required positioning accuracy should be evaluated together with the required pin diameter. For an existing assembly, a drawing or measured hole specification is preferable to selecting the pin based on nominal diameter alone.
Can you manufacture DIN 6325 pins from customer drawings?
Yes. Anhui Pins Metal Products Co., Ltd. can manufacture hardened ground dowel pins according to customer drawings, samples, or specified dimensional requirements, including non-standard diameter, length, tolerance, and end geometry.
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