NorDav Custom 316L Stainless Steel Indexing Bolt (M20x1.5)

Description

Custom-Milled 316L Marine Stainless Steel Replacement Plunger Bolt for Davit Locking Systems

The NorDav Custom 316L Stainless Steel Indexing Bolt (M20x1.5) provides a rugged, zero-tolerance structural restoration path for boat builders, luxury yacht maintainers and commercial watercraft mechanics. Heavy-duty marine swivel davits and personal watercraft handling systems operate under immense stress, absorbing thousands of kilograms of lateral torque force during heavy blue-water ocean passages. Over time, standard fasteners can suffer from thread elongation or micro-fatigue tracks. This custom-forged, low-carbon replacement bolt restores your anchoring block back to perfect factory tight boundaries.

Advanced 316L Metallurgy & High-Yield Structural Threading

Constructed entirely from premium, industrial-grade 316L stainless steel, this custom-milled indexing component contains reduced carbon ratios specifically to block intergranular corrosion after welding or heavy machining cycles. It possesses immense resistance to localized pitting and stress-cracking caused by constant contact with stagnant, highly oxygenated saltwater pools behind the transom. The fine M20×1.5 metric pitch tracks ensure maximum thread contact area, dispersing high-pressure torque forces across a broad cross-section to eliminate structural stripping tracks.

Bespoke Manufacturing & Precision Fitment Strategy

Adhering to NorDav’s strict standard of mechanical engineering excellence, this replacement hardware bit is turned to strict dimensional tolerances. The polished, unthreaded shoulder section slides perfectly inside your primary rotation swivel lock housing, creating a snug friction fitment that completely dampens structural vibration. Because this component is produced on an individual made-to-order basis, it represents a premium hardware option for yacht owners restoring older davit frames back to like-new marine operating specifications.

🔧 Official M20 Indexing Bolt Replacement & Fitment Guide

Follow these technical steps to ensure an accurate, binding-free installation sequence into your rotation housing:

1. Extract and Clean Tracks: Back out the worn or damaged indexing bolt from your rotation swivel lock casing using proper socket tools. Thoroughly flush the internal M20 internal thread lines with an industrial solvent cleaner to completely extract old grease crusts, salt crystals and metal slivers.
2. Thread Alignment Hand-Check: Coat the fresh custom 316L bolt threads lightly with a marine anti-seize paste or Teflon liquid compound. Hand-thread the bolt into the housing collar for the first 3 to 4 rotations to verify perfect alignment tracking and prevent accidental cross-threading damage.
3. Torque to Structural Spec: Drive the bolt down to its final seating depth using hand wrenches until the retention shoulder ring fits flush against the internal stopper seat. Do not over-torque using high-impact air tools, as this can crush the thread pitch walls over time.
4. Mechanical Clearance Validation: Perform multiple mock lock cycles by rotating your primary davit frame back and forth. The custom indexing bolt tip must drop cleanly into the swivel locking plates with zero resistance or sticky friction binding tracks.

📊 Technical & Engineering Specifications

Review the precise sizing parameters and material chemistry metrics for this custom marine-grade fastener: