DIN5903 Fish Bolt | Oval Neck Track Bolt for Ship Deck Rail
TheFish Bolt manufactured to DIN5903 standard features a distinctive dome-shaped head combined with an elliptical Oval Neck Track Bolt profile that prevents rotation during installation and service—a critical design requirement where access for torque wrench engagement is limited or impossible from both sides of the joint. Unlike a conventional Anchor Bolt designed for embedment into concrete substrates, the fish bolt functions as a through-bolting solution for pre-drilled rail baseplates and structural channels.
On ship decks, these bolts secure crane travel rails, hatch cover guide tracks, winch base sliding guides, and stowage rack mounting channels. The oval neck seats precisely into the slotted hole of the rail base or channel flange, locking the assembly against turning forces generated by crane traverse motion, wave-induced deck flexure, and thermal expansion cycles. Where full-depth anchoring is required—such as heavy equipment foundation plates cast directly into deck concrete—a Sleeve Anchor Bolt may serve as an alternative; however, for removable rail segments requiring periodic inspection and replacement, the Fish Bolt with split-pin retained nut offers superior maintainability.
| Product Name | Fish Bolt / Oval Neck Track Bolt |
| Standard | DIN5903 (Railway Fish Bolt) / Custom Marine Spec |
| Type | Fish Bolt/Oval Neck Track Bolt / Mushroom Head Track Bolt |
| Size Range | M12 – M27 |
| Length Range | 60 mm – 300 mm |
| Head Shape | Dome Head / Mushroom Head / Round Head |
| Neck Profile | Oval Neck (Anti-Rotation) / Square Neck (Alternative) |
| Material / Grade | Carbon Steel 4.6 / 4.8 / 8.8 |
| Surface Finish | Black Oxide / Hot-Dip Galvanized / Zinc Plated |
| Application | Crane Rail / Hatch Cover Track / Winch Guide / Deck Equipment Mounting |
| Packaging | Bulk Carton + Pallet / Wooden Case with Desiccant |
SINOFASTENER supplies DIN5903 fish bolts with consistent oval neck dimensional tolerance ±0.2 mm, ensuring precise fitment in rail base slots across every production batch. For shipyards comparing Sleeve Anchor Bolt permanent foundation options against Anchor Bolt embedment methods versus Fish Bolt through-bolting solutions, our technical team provides joint-design recommendations based on load class, maintenance frequency, and corrosion environment classification.
E-mail: sales@sinofastener.com | SINOFASTENER
