Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Internally Threaded Solid Dowel Pin |
| Standard | ISO 8735 / DIN 7979 |
| Material | Hardened Steel / Stainless Steel |
| Outer Diameter | Standard / Custom |
| Length | Standard / Custom |
| Internal Thread | Metric |
| Thread Size | According to Pin Size |
| Thread Depth | Standard / Custom |
| Hardness | Standard / Custom |
| Surface Treatment | Natural / Black Oxide / Oil / Custom |
| Tolerance | Standard / Custom |
Internally Threaded Solid Dowel Pin Design & Function
Internally threaded solid dowel pins combine a precision-ground locating diameter with an internal threaded hole. The outer diameter provides accurate positioning between mating components, while the internal thread provides a functional interface for installation or extraction.
Precision Locating Surface: The cylindrical outside diameter establishes the primary locating fit in the mating bore.
Internal Threaded Bore: The threaded hole provides access for a mating screw or an extraction tool.
Solid Construction: A solid pin body maintains dimensional stability under repeated positioning and assembly loads.
Dual-Function Design: Combines locating and threaded access in one component, reducing the need for a separate extraction feature.
Internal Thread & Fastener Compatibility
The internal thread must be selected together with the mating fastener to ensure correct engagement and usable thread depth.
- Thread Size: The internal thread should correspond to the specified screw or bolt diameter.
- Thread Pitch: Metric thread pitch must match the mating fastener to prevent cross-threading or incomplete engagement.
- Thread Depth: Sufficient usable thread length is required to achieve the intended fastener engagement without bottoming out.
- Fastener Engagement: The screw length should account for the required thread engagement and the available internal thread depth.
We manufacture internally threaded solid dowel pins with integrated control of pin sizing, internal threading, heat treatment, grinding, and dimensional inspection.
- Precision Grinding: Ground locating diameters are produced for controlled fit and dimensional consistency.
- Thread Machining: Internal threads are processed and checked according to the specified thread requirements.
- Heat Treatment Control: Material hardness is verified after heat treatment to maintain the required mechanical condition.
- Inspection Capability: Diameter, length, thread dimensions, hardness, and critical geometric requirements can be inspected during production.
Custom Internally Threaded Solid Dowel Pins
Custom production is available when the required pin dimensions or internal thread configuration falls outside standard ISO 8735 or DIN 7979 specifications.
- Custom Diameter & Length: Non-standard outside diameters and pin lengths can be manufactured according to drawings.
- Custom Internal Thread: Thread size, pitch, and usable thread depth can be specified for the mating fastener.
- Custom Tolerances: Outside diameter, length, and other critical dimensions can be controlled according to customer drawings.
- Drawing & Sample Production: Production can be developed from technical drawings, samples, or defined dimensional specifications.
Material, Hardness & Surface Treatment
Material and hardness selection should be based on locating load, wear conditions, corrosion exposure, and the requirements of the mating components.
- Hardened Steel: Suitable for applications requiring wear resistance and dimensional stability during repeated positioning.
- Stainless Steel: Available for assemblies where corrosion resistance is a primary requirement.
- Hardness Control: Heat treatment can be controlled according to the specified material and application requirements.
- Surface Treatment: Natural finish, black oxide, oil, or other specified treatments can be selected according to the operating environment.
Dimensional Accuracy & Thread Concentricity
For internally threaded locating pins, the relationship between the outside diameter and internal thread axis directly affects assembly alignment.
- Outside Diameter Tolerance: Controlled to achieve the specified fit with the mating bore.
- Length Tolerance: Maintained to control the installed position and available locating depth.
- Thread Position: Internal thread machining is controlled relative to the pin axis to avoid excessive eccentricity.
- Concentricity Inspection: Critical parts can be inspected for the relationship between the locating diameter and threaded bore according to drawing requirements.
Our Customers & Cooperation
Quality Control
We implement a strict multi-stage quality control system to ensure stable performance and consistent quality of every pin. The process covers raw material inspection, in-process monitoring during production, heat treatment verification, and final inspection before shipment. Key parameters such as dimensions, hardness, and surface condition are carefully checked using precision measuring equipment to ensure compliance with technical requirements. Each batch is fully traceable and controlled under standardized procedures, ensuring reliable quality for industrial and OEM applications.
FAQ
Are ISO 8735 and DIN 7979 interchangeable for internally threaded dowel pins?
ISO 8735 and DIN 7979 cover internally threaded dowel pins, but dimensional requirements should be checked against the applicable standard before substituting one for the other.
Can these dowel pins be used with a standard socket-head screw?
Yes, provided the screw thread matches the pin's internal thread specification and the screw length does not exceed the available usable thread depth.
Can the pin be installed with an interference fit?
Yes. The required fit depends on the bore tolerance, pin diameter, assembly method, and service requirements. The specified bore and pin tolerances should be confirmed before production.
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