Identify Sea-Dog Brass and Stainless Boat Snaps by MPN
Sea-Dog boat snaps may look similar in a bin, but the attachment eye and latch style can differ substantially. This guide separates three polished brass snaps from four cast 316 stainless versions using the original part number, fixed or swivelling eye, trigger action and bull-nose profile.
Recognize the metal, eye and closure
Brass boat snaps · 139 series
139120-1 is a polished fast-eye brass snap, 139132-1 uses a swivelling eye, and 139800-1 uses an overlapping trigger closure. These are separate mechanisms.
316 stainless boat snaps · 146 series
146120-1 uses a fast-eye latch, 146131-1 a swivel eye, 146333-1 a bull-nose swivel and 146590-1 an easy-open swivel-eye bolt snap.
Match the exact Sea-Dog number and mechanism
| Part number | Material | Closure design | Eye and latch details |
|---|---|---|---|
| 139120-1 | Polished sand-cast brass | Fast-eye snap | Spring latch; fixed eye |
| 139132-1 | Polished sand-cast brass | Swivel-eye snap | Spring latch; 360° swivelling eye |
| 139800-1 | Polished sand-cast brass | Trigger snap | Overlapping hinged snap with thumb lever; swivelling strap eye |
| 146120-1 | Investment-cast 316 stainless steel | Fast-eye snap | Spring latch; fast-eye attachment |
| 146131-1 | Investment-cast 316 stainless steel | Swivel-eye snap | Spring latch; 360° swivel |
| 146333-1 | Investment-cast 316 stainless steel | Bull-nose swivel snap | Bull-nose spring latch; 360° swivel |
| 146590-1 | Investment-cast 316 stainless steel | Swivel-eye bolt snap | Easy-open thumb lever; swivelling strap eye |
Hardware selection: The closure type, metal, eye dimensions and service requirements must all match the intended application. Similar-looking snaps should not be treated as interchangeable.
Inspect the snap, latch and eye
- Match the exact Sea-Dog number, material and closure type. A brass trigger snap is not the same as a stainless fast-eye snap.
- Check that the latch closes positively. Look for worn spring parts, broken trigger levers and interference at the hook nose.
- Test whether a specified swivelling eye rotates freely without excessive wear or binding.
- Check for cracks, distorted metal, looseness, corrosion or evidence of an overloaded connection.
- Confirm the required eye size and working requirements independently; the product's appearance and stainless grade do not prove a safe working-load rating.
Check each listing for condition and completeness. Viewing and pickup at UsedRVParts in Kelowna are by appointment.
Match a boat snap to the product listing
Inspect each listing for its actual item condition and included components.
More marine fastening references
For spring-gate hooks and threaded links, see the Sea-Dog hook and quick-link identification guide.
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