Identify Sea-Dog Snap Hooks, Eye Inserts & Quick Links
In a mixed tray of marine connectors, first look at the closure mechanism. The 151-series Sea-Dog snap hooks close with an interlocking spring gate, while the 153-series oval quick links have a threaded hex sleeve. The exact number then identifies a material, size and eye configuration.
Spring gates versus threaded sleeves
151-series snap hooks
Formed stainless hooks with interlocking, spring-loaded gates. Some have an integral eye insert, which is a different component shape from the basic hook.
153-series quick links
Oval connectors with a hexagonal threaded closure for opening and resecuring a chain or accessory connection. Verify the specific alloy: these examples include both 304 and 316 stainless.
Identify the hook or link from its dimensions
| Sea-Dog MPN | Design | Material | Overall length | Distinguishing feature |
|---|---|---|---|---|
| 151560-1 | Snap hook | 316 stainless | 2-3/8 in | Spring gate, 5/16-in eye opening |
| 151580-1 | Snap hook | 316 stainless | 3-1/8 in | Spring gate, 7/16-in eye opening |
| 151585-1 | Snap hook with eye insert | 316 stainless | 3-1/8 in | Spring gate, 3/8-in eye opening |
| 151600-1 | Snap hook | 316 stainless | 3-15/16 in | Spring gate, 9/16-in eye opening |
| 151605-1 | Snap hook with eye insert | 316 stainless | 3-15/16 in | Spring gate, 7/16-in eye opening |
| 151620-1 | Snap hook | 316 stainless | 4-11/16 in | Spring gate, 11/16-in eye opening |
| 151625-1 | Snap hook with eye | Stainless (grade unconfirmed) | Verify MPN dimensions | Integral eye; confirm individual component dimensions |
| 153008-1 | Threaded oval quick link | 316 stainless | 2-7/8 in | Hex threaded sleeve; 5/16-in stock |
| 153708-1 | Threaded oval quick link | 304 stainless | 2-15/16 in | Hex threaded sleeve; 5/16-in stock |
| 153710-1 | Threaded oval quick link | 304 stainless | 3-1/2 in | Hex threaded sleeve; 3/8-in stock |
Breaking strength is not a working-load limit. Some listings provide breaking-strength or capacity figures; these should not be treated as a certified working-load rating or assumed safe for personnel support, overhead lifting, towing safety chains or other regulated load-bearing applications. Select certified hardware for those uses.
What to inspect on used hardware
- Confirm the full Sea-Dog number and whether the closure is a spring gate or a threaded sleeve.
- Check the shape, eye insert and overall length. Several snap hooks differ only in the attached eye or opening size.
- For snap hooks, verify the gate closes fully under spring pressure; examine the nose for distortion or wear.
- For threaded links, inspect sleeve threads, the ends of the opening and whether the hex sleeve can completely close without binding.
- Look for bending, rust, galling, cracks and signs of overloaded use. Match the material grade where specified, and do not infer a safe load rating from breaking strength.
Products at UsedRVParts can be inspected by appointment in Kelowna. Each listing should be checked for its actual condition and availability.
Locate the exact numbered item
Review the product listing for item condition and actual components.
Related marine hardware guides
Our Sea-Dog D and bow shackle identification guide covers screw-pin shackle styles and their lack of load ratings.
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