Button 4-hole | A4 | M8218

A cleat with 4 mounting holes (M8218) in A4 stainless steel is a robust and reliable component for mooring boats and securing ropes, lines, and hawsers. It is manufactured from high-quality acid-proof stainless steel to provide maximum durability and corrosion resistance, even during prolonged exposure in demanding marine and industrial environments. Sold individually.

AREA OF USE

The cleat is used for mooring boats and for securing lines, ropes, halyards, and sheets on decks, docks, and masts. It is mounted with four screws or through-bolts in acid-proof A4 and is suitable for both recreational boats and docks in salt and fresh water.

TECHNICAL SPECIFICATIONS

• Product type: Cleat / bollard

• Material grade: Stainless steel A4 / AISI 316

• Surface finish: Untreated – natural polished stainless steel

FREQUENTLY ASKED QUESTIONS (FAQ)

What is the difference between a cleat and a bollard, and what are they used for?

Both cleats and bollards are attachment devices for ropes, lines, and hawsers, but their design differs slightly:

• Cleat: Features a T-shaped or two-armed profile where the line is locked quickly and securely by wrapping it in figure-eights (cleat hitching). Ideal for mooring recreational boats, handling sheets and halyards, and securing lines on decks, docks, and masts.

• Bollard: Often consists of one or two vertical posts/cylinders (sometimes with a crossbar) designed to withstand high tensile forces from heavier moorings.

Both provide a reliable and quick attachment point where lines can easily be secured or released without advanced knots.

Why is acid-proof stainless steel A4 (AISI 316) a must for cleats and bollards?

Mooring hardware is exposed to some of the most grueling environments in existence:

• Saltwater and marine climate: A4 steel (1.4401 / AISI 316) contains molybdenum, which provides complete protection against crevice and pitting corrosion in brackish water and harsh saltwater.

• High mechanical load: Moorings are affected by continuous jerks from waves, wind, and currents. Acid-proof A4 steel combines high tensile strength with toughness, preventing fatigue cracks in the material.

• No staining: Unlike simpler metals or surface-treated steel, A4 does not produce rust stains that discolor plastic decks, wooden docks, or mooring lines.

What should one consider regarding mounting and screw selection for an A4 cleat?

Since a cleat or bollard can be subjected to very high tensile forces, proper installation is critical for safety:

1. Correct screw grade: Always use acid-proof A4 screws for mounting. Never mix materials (e.g., electro-galvanized or A2 screws) as galvanic cells will arise, which quickly break down the attachment.

2. Through-bolt and backing washer: For maximum strength on a deck or thin surface, the cleat should be attached with through-going M-threaded bolts (e.g., DIN 603 or DIN 933 A4) and large fender washers (DIN 9021 A4) or a reinforcement plate on the underside to distribute the force.

3. Sealing for deck mounting: Use marine sealant (e.g., polyurethane or MS polymer) around the screw holes to prevent water from penetrating the deck core.