Rigging screw | A4 | M8144

Stainless steel A4 clevis pin is intended for use in corrosive and marine environments. The product is used as a pivot pin in clevis joints where a detachable and movable attachment is required. The pin is inserted through components with matching holes and secured with a cotter pin through the cross-hole, which prevents axial displacement. It is suitable for installations where high corrosion resistance, precise fit, and reliable mechanical function are crucial.

APPLICATION AREA

The product is used in marine rigging, wire systems, fitting systems, and mechanical links. It is intended for applications where an articulated attachment is required, such as in fork fittings, turnbuckles, shackles, and other rigging components. The clevis pin allows for rotation in the joint while being secured with a cotter pin to prevent accidental loosening. The material choice provides resistance to saltwater, moisture, and chemically aggressive environments.

TECHNICAL SPECIFICATIONS

Product type: Bolt
Product family: Clevis pin
Material class: A4
Strength class: Not specified
Standard: Not specified
Diameter: 4–20 mm
Design: With cross-hole for cotter pin
Surface finish: Bright
Environment: Marine
Delivery unit: Piece

FREQUENTLY ASKED QUESTIONS (FAQ)

What is a clevis pin and how does it differ from a standard bolt?

A clevis pin has a completely smooth cylindrical body without threads and a pre-drilled cross-hole at the lower end. It acts as a pivot pin in clevis joints and linkage systems, allowing mobility in the joint without wear occurring on thread flanks. Instead of a threaded nut, the clevis pin is secured quickly and securely with a cotter pin, R-clip, or split ring.

How is the clevis pin correctly secured against axial displacement?

To prevent the pin from sliding out of its position, a suitable locking pin (e.g., cotter pin or split ring in A4 stainless steel) is inserted through the cross-hole at the end of the pin.

• For permanent installations: Use a cotter pin whose legs are bent outwards after installation.

• For frequent dismantling: An R-clip or split ring is advantageously used, which can be easily removed without tools.

Why is acid-proof A4 / AISI 316 crucial for clevis pins in marine and industrial environments?

Clevis pins are often subjected to high shear forces while being located in crevice-like spaces inside fork fittings and turnbuckles. Acid-proof A4 steel (AISI 316 / 1.4401) contains molybdenum, which provides maximum protection against crevice and pitting corrosion that can otherwise quickly occur in damp, salty, or chemically aggressive environments. This ensures that the pin retains its load-bearing capacity and does not seize during maintenance.