Overview

This document from STRACK NORMA GmbH & Co. KG serves as a comprehensive technical reference for mechanical fastening components including dowel pins, various types of screws, spring stops, and related accessories. It details dimensions, materials, hardness, and compliance with international standards to support correct selection and application in mechanical assemblies.

1. General Information

The catalog-style document provides product codes, material specifications, and contact information. It covers general accessories such as cylindrical dowel pins, cylinder head cap screws, countersunk screws, locking screws, and spring stops.

2. Dowel Pins

Dowel pins are specified with detailed dimensional tables including diameter, lengths, radii, and chamfer sizes. They conform to EN ISO 8735 and are primarily made from 1.7131 steel with hardness around 60 ±2 HRC. Stainless steel variants (INOX 17% Cr) with hardness 52-54 HRC are also available. Extraction tools for maintenance are recommended.

3. Screws

3.1 Cylinder Head Cap Screws

Available in metric sizes M3 to M24, these screws comply with DIN EN ISO 4762-10.9 and DIN 7984-8.8. Dimensions include length, head diameter, head height, and thread length. Material and hardness details ensure mechanical reliability.

3.2 Countersunk Head Screws

Sizes range from M3 to M12, conforming to ISO 2009 and ISO 10642-8.8. Dimensions cover length, head diameter, and head height.

3.3 Locking Screws

Locking screws sized M4 to M16 meet ISO 4026 and DIN 913 standards, with hardness around 45H. Dimensions include length, diameter, and wrench size.

4. Spring Stops

Spring stops are detailed with diameter, length, thickness, and force parameters (P1, P2 in Newtons). Materials include 1.0715 and stainless steel 1.4303, with maximum operating temperatures from 100°C to 250°C depending on the variant.

5. Spring Ejectors

Specifications include length, multiple diameters, thickness, wrench size, and force ratings (F1, F2 in Newtons). Materials are 1.0718 and stainless steel 1.4305, with max temperature up to 250°C.

6. Guide Screws

Partial data is provided for guide screws, listing diameter, length, thread size, and wrench size.

7. Standards and Materials

• Materials: Various steels such as 1.7131, 1.0715, 1.0718, and stainless steels 1.4303, 1.4305 with specified hardness levels.
• Standards: EN ISO 8735 for dowel pins; DIN EN ISO 4762 and DIN 7984 for cylinder head screws; ISO 2009 and ISO 10642 for countersunk screws; ISO 4026 and DIN 913 for locking screws.

8. Key Parameters and Limitations

• Maximum operating temperatures for spring stops and ejectors range between 100°C and 250°C depending on material.
• Hardness values are critical, e.g., dowel pins at 60 ±2 HRC, ensuring durability and performance.
• Dimensional tolerances and surface finishes (e.g., Rz 4) are specified for precision fitting.

9. Recommendations and Usage

Best practices include selecting fasteners based on size, material, and mechanical requirements. Use of extraction tools for dowel pins is advised for maintenance and replacement.

Technical Specifications Table

The document includes a table listing metric thread sizes (M10, M12, M16, M20) with associated dimensions such as lengths and diameters. Size ranges extend from 10 to 120 units (likely millimeters), providing critical data for engineering design.

Material and Mechanical Properties

• Material grades such as W 8305, Z 76, Z 148, R 1031 correspond to specific steel types.
• Tensile strength values range from 1180 to 1370 N/mm², indicating high-strength materials suitable for demanding applications.
• Dimensional tolerances (e.g., h11) and parameters like d2, L1, SW ensure proper fit and interchangeability.

Standards and Norms

The document references standard 2.2.110 D 3002 03.2012, governing component specifications. Manufacturer details for STRACK NORMA GmbH & Co. KG are provided for sourcing and support.

Summary of Critical Information

• Detailed dimensional and mechanical specifications for metric fasteners and accessories.
• Comprehensive size ranges and thread designations with precise measurements.
• Material grades and tensile strengths ensure suitability for high-stress environments.
• Standards and tolerances guarantee quality and interchangeability.
• Intended for engineers and procurement specialists to select and verify components in mechanical assemblies.