Split pins & bolts
"Cots & Bolts" is a specialized subcategory within the main category "Tools & Fasteners" (fastening accessories). Here you will find push pins, ring cotter pins, safety cotter pins, and safety cables for typical onboard applications: e.g., on steering systems, fittings, shroud/stay terminals, blocks, folding and push-fit fittings, tiller extensions, lifesaving equipment, or movable connections that need to be securely fastened yet quickly releasable.
Our product range (subject to availability) includes brands such as L’Ocean, Talamex, and Seasure. Brand names are retained in their original form—this is important for ensuring a perfect fit for replacement parts, consistent quality, and the correct selection of materials (e.g., A2/A4) for the specific operating environment.
For split pins and bolts, dimensions, material, and fastening method determine function and safety. Especially in salty environments, under vibrations, and with dynamic loads, the right design pays off: corrosion-resistant, a snug fit with no play, and secured so that nothing can come loose unintentionally—yet remains quick to disassemble when service is required.
- Dimensions & Fit: Bolt diameter, effective length, head shape, hole position for the split pin, and component thickness must all match.
- Material selection: A4 for saltwater/high corrosion exposure, A2 for less aggressive environments; consider galvanic coupling (e.g., aluminum/stainless steel).
- Securing: Ring cotter pin, cotter pin, retaining clip, or retaining wire depending on risk, accessibility, and vibration exposure.
- On-board practice: Keeping a set of spare split pins/bolts on board saves time—especially for frequently disassembled connections (trailers, mast lowering, rudder installation).
Examples from the product range: L’Ocean stainless steel ring cotter pin A4 (e.g., 10 mm); L’Ocean retaining wire with plug pin 250 mm (INOX A2); L’Ocean plug pin 10 × 34 mm (INOX A4); L’Ocean pin 8 × 24 mm (A4).
FAQ
How do I find the right bolt (diameter, length, hole position)?
Check the pin diameter (must fit snugly but move smoothly), the effective length (component thickness + washers/tolerance), and the hole position for the split pin/clip. The head shape (e.g., with a grip/ring) is also important, as is whether the pin should be quickly removable as a push-in pin. The safest approach: measure the old pin or compare it to a sample.
Which type of retaining element is suitable for what (ring cotter, retaining clip, cotter pin, retaining wire)?
Ring split pins are quick to use and ideal for frequent loosening (e.g., trailers, rudder mounting). Retaining clips are compact and quick, but require a proper fit and good accessibility. A classic split pin (bent) is very secure but less convenient for repeated opening. Retaining cables prevent loss (e.g., if there is a risk of falling overboard) and are very practical during maintenance work.
Which material: A2 or A4 – what makes sense on board?
A4 stainless steel is generally the best choice for saltwater and permanently damp, corrosive areas. A2 may be sufficient in less aggressive environments (inland waters, sheltered areas). Important: In case of contact with aluminum (e.g., mast/aluminum fittings), be aware of galvanic effects—insulate if necessary (washers/separators) and check regularly.
What are common sources of problems (rattling, jamming, coming loose)?
Common causes include incorrect diameter (too much play = rattling/wear; too tight = jamming), improper working length, unfavorable hole position, or missing washers. Loss is often caused by pins that are too small or unsuitable, or by strong vibrations. Remedy: Use the correct dimensions, select an appropriate fastener, and secure against loss with a safety cable if necessary.
Installation: What should I pay attention to (safety, wear, corrosion)?
Keep contact surfaces clean; use appropriate washers if necessary, and install moving joints so that nothing gets jammed. Ensure cotter pins/clips are fully engaged or bend cotter pins cleanly. In corrosive environments, regular rinsing with fresh water helps. For highly stressed joints: Check for signs of wear (scoring, ovality) and replace early.
How can the fastening remain reliable over the long term?
Regularly inspect for corrosion, deformation, and wear (worn-out holes, worn-in bolts). Briefly check cotter pins/clips every time you open the connection—it’s better to replace bent or corroded parts. A small on-board assortment (common diameters/lengths) saves time, especially on a cruise.
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