Sea-Dog D vs Bow Shackles: 316 Stainless Sizes and Selection
Sea-Dog offers two visually distinct cast stainless shackle patterns: a straight-sided D shape and a rounded bow. Both families use removable screw pins, but their body geometry and nominal sizes differ. This chart covers seven stocked 316 stainless models by exact manufacturer number.
Recognize the two shackle patterns
D shackles: narrower sides
The 147006-1, 147008-1 and 147010-1 family has straight sides and a U-shaped rounded end. Match the original body and the mating connection clearance.
Bow shackles: rounded body
The 147056-1, 147058-1, 147060-1 and 147062-1 family has a visibly wider rounded outline with a removable screw pin for repeated connection and disconnection.
Sea-Dog stainless shackle part-number comparison
| Sea-Dog MPN | Body shape | Manufacturer size A | Construction |
|---|---|---|---|
| 147006-1 | Straight-sided D | 1/4 in | Investment-cast 316 stainless steel |
| 147008-1 | Straight-sided D | 5/16 in | Investment-cast 316 stainless steel |
| 147010-1 | Straight-sided D | 3/8 in | Investment-cast 316 stainless steel |
| 147056-1 | Rounded bow | 1/4 in | Investment-cast 316 stainless steel |
| 147058-1 | Rounded bow | 5/16 in | Investment-cast 316 stainless steel |
| 147060-1 | Rounded bow | 3/8 in | Investment-cast 316 stainless steel |
| 147062-1 | Rounded bow | 7/16 in | Investment-cast 316 stainless steel |
“Size A” follows Sea-Dog's dimension labels. Compare the full shackle dimensions and the mating hardware—not just the listed size—before selecting a replacement.
Important: no manufacturer's load rating. Sea-Dog specifically states that these investment-cast D and bow shackles are not load rated. Do not infer a safe working load from the diameter, stainless grade or appearance. For any connection requiring a rated working load, use an appropriately documented, rated component selected for that application.
Select by geometry, not by an assumed load capacity
- Start with the connection geometry: straight-sided D versus rounded bow.
- Compare the manufacturer's nominal size A and the clearance required by your chain, strap, fitting or eye.
- Confirm the screw pin operates correctly and the selected part can be fully secured in the intended installation.
- Check for any specified working-load requirement. These investment-cast Sea-Dog shackles carry no load rating, even though they are corrosion-resistant 316 stainless steel.
- Use a rated, application-appropriate alternative when the project requires a certified working load or overhead lifting capability.
Sea-Dog D and bow shackles
Open the corresponding manufacturer part number for further item details.
More marine hardware references
Our Sea-Dog stainless hinge guide covers other marine hardware size and style differences.
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