Overview of Fittings and Accessories

This document provides detailed specifications and descriptions of various mechanical fittings and accessories used primarily for wire blocking, fork assemblies, adjustment screws, angular joints, sheath heads, sleeves, and protective bellows. The components are described with their dimensions, materials, and functional features, often referencing standard norms such as UNI 1676, DIN 71752, and DIN 71802.

1. Holdfasts (Morsetti)

Holdfasts are devices used for wire blocking, available in different shapes and configurations:

• Hexagonal Holdfasts: Made of brass with a threaded grub screw for securing wire. Dimensions vary by code (e.g., COD. 03622010 with A=5.5mm, B=7mm, C=2.3mm).
• Round Holdfasts: Feature a screw at the end or lateral screws, with bodies made of brass or other metals. Some include an internal brass plate to protect wire integrity during blocking (notably COD. 03824135).
• Variants: Holdfasts with one or two lateral screws, with or without wire blocking nibs, and versions designed for sheath support or adjustment screw bearing.

Key Parameters: Dimensions A, B, C, D, E, CH (wrench size), and material composition (brass, zinc plated iron) are specified for each code. Some holdfasts are designed to prevent wire damage by including internal brass plates.

2. Forks and Fork Clips (Forcelle and Clips per Forcelle)

Forks are components with threaded holes standardized according to UNI 1676 and DIN 71752. Fork clips are accessories designed to fit these forks, also conforming to the same standards.

• Forks: Available in various sizes with detailed dimensions (A, B, C, D, E, F, G) and thread sizes (M5 to M14).
• Fork Clips: Designed to secure forks, with dimensions and thread sizes matching the forks. Some clips are noted as out of norm due to different thread specifications.

3. Adjustment Screws (Registri)

Adjustment screws are zinc-plated iron components suitable for all types of lever supports. They come in various thread sizes (M5 to M12) and detailed dimensions (A, B, C, D, E, F, CH).

4. Fork Pins (Perni per Forcelle)

Fork pins with heads are standardized according to UNI 1676 and DIN 71752. They come in multiple sizes with detailed dimensional data (A, B, C, D, E, F, G).

5. Angular Joints (Snodi Angolari)

Angular joints comply with DIN 71802 standards and are available in various sizes with dimensions A, B, C, D, E, F, G. They are designed for angular movement and wire blocking applications.

6. Sheath Heads (Capiguaina)

Sheath heads are components made from zinc-plated iron or nickel-coated brass, designed to cap or finish wire sheaths. They come in round turned or other shapes with specified dimensions.

7. Sleeves (Bussole)

Sleeves are round components made of zinc-plated iron used for sheath support. They are available in various sizes with detailed dimensional specifications (A, B, C, D, E, F).

8. Protective Bellows (Soffietti di Protezione)

Protective bellows are flexible covers designed to protect cables. They come in different sizes with specified minimum and maximum lengths and diameters (L, ØD, Ød, De).

Standards and Norms

• UNI 1676 and DIN 71752: Referenced for forks, fork clips, and fork pins ensuring standardized dimensions and compatibility.
• DIN 71802: Referenced for angular joints ensuring compliance with angular movement requirements.

Critical Information and Best Practices

• Material choice (brass, zinc-plated iron, nickel-coated brass) is critical for corrosion resistance and mechanical strength.
• Internal brass plates in some holdfasts prevent wire damage during blocking, enhancing durability.
• Thread sizes and dimensions must be matched carefully to ensure proper fitting and function.
• Some components are marked as "out of norm" due to non-standard thread sizes, requiring special attention during selection.

Summary

This document serves as a comprehensive technical reference for selecting and specifying mechanical fittings related to wire blocking and fork assemblies. It provides detailed dimensional data, material specifications, and compliance with relevant standards to ensure proper application and durability of components in mechanical systems.