DIN1445 Clevis Pins with Head and Threaded Portion T-Head Bolts

What are the dimensional specifications and thread configurations for DIN 1445 clevis pins?

The pin is defined by its nominal diameter d (shank diameter) ranging typically from 5 mm to 30 mm, with the threaded portion conforming to ISO metric coarse pitch threads (6g) . The T‑head dimensions—head width, height, and thickness—are standardised to ensure proper seating against the clevis fork. Overall lengths are specified in increments to accommodate various fork widths plus a protruding threaded section for nut engagement. The unthreaded shank length is precisely controlled to align with the shear plane within the clevis, minimising bending stress.

What material property classes and surface finishes are commonly applied?

For carbon steel versions, property classes 4.6, 5.6, or 8.8 to DIN EN ISO 898‑1 are available, with 8.8 offering minimum tensile strength of 800 MPa and yield strength of 640 MPa . Stainless steel options typically conform to A2‑70 (1.4301/304) or A4‑70 (1.4401/316) per ISO 3506, providing corrosion resistance in outdoor or marine environments. Surface treatments for carbon steel include electro‑zinc plating (5–12 μm) for basic corrosion protection, hot‑dip galvanizing (40–80 μm) for enhanced durability, or geomet / zinc flake coatings for consistent friction control.

How does the T‑head design influence installation and load transfer?

The T‑head provides a positive anti‑rotation feature that engages with the clevis fork, allowing the pin to be torqued without requiring a separate tool to hold the head. This design simplifies assembly, particularly in confined spaces. In service, the smooth shank carries the shear load across the clevis ears, while the threaded portion accepts a standard hexagon nut (e.g. DIN 934 or ISO 4032) to secure the assembly. The clearance between the shank and the clevis holes is controlled to ISO H11/h9 or similar, ensuring precise alignment and minimising wear under cyclic loading.