Sea-Dog 270100-1 — Top cap
316 stainless steel · 7/8 in tubing
Stainless top cap rather than an internal nylon insert; fits 7/8-inch OD tube.
Identify Sea-Dog Bimini Top Caps vs Inserts by Tube Size and MPN
Bimini top fittings with the same 1/4-inch pin can still attach to the frame differently. A top cap fits the outside of a tube; a top insert goes into its end. Identify Sea-Dog's exact part number, tube diameter and material before selecting a replacement.
Identify the Bimini tube-end fitting
Outside-fitting top caps
270100-1 and 270101-1 are stainless caps for 7/8- and 1-inch tubes. Nylon 273100-1 and 273101-1 fit 7/8-inch tubing in black or white.
Inside-fitting top insert
273180-1 fits inside a 7/8-inch OD round tube. A top insert is not interchangeable with a cap simply because both use a 1/4-inch pivot pin.
Single or pair
The stainless caps are individual parts. The black and white nylon caps and black nylon insert in these listings are pairs.
Tubing and hardware
The manufacturer lists a 0.049-inch stainless tubing wall reference. Stainless cap set screws are separate (299999-1) and use a 1/8-inch Allen key.
Sea-Dog part-number reference
The models shown have a shared 1/4-inch pin size but different tube sizes and attachment styles. Use the part number to distinguish them.
| MPN | Style | Material | Tube OD | Pin | Listing quantity |
|---|---|---|---|---|---|
| 270100-1 | Top cap | 316 stainless steel | 7/8 in | 1/4 in | Single |
| 270101-1 | Top cap | 316 stainless steel | 1 in | 1/4 in | Single |
| 273100-1 | Top cap | Black nylon | 7/8 in | 1/4 in | Pair |
| 273101-1 | Top cap | White nylon | 7/8 in | 1/4 in | Pair |
| 273180-1 | Top insert | Black nylon | 7/8 in | 1/4 in | Pair |
Important fit detail: A 7/8-inch external cap does not become an internal insert simply because it shares a 1/4-inch pin with another fitting. Check the tube profile and the installation hardware. Sea-Dog lists its stainless top-cap set screws separately as part 299999-1.
Checks before reusing an old frame
- Check whether the original fitting slips over the tubing (cap) or sits inside its end (insert).
- Measure the tubing's outside diameter. The stainless cap 270101-1 is for 1-inch tube; the other listed fittings are for 7/8-inch tube.
- Check the pivot pin hole for the specified 1/4-inch pin and compare material, finish and quantities.
- Confirm whether a set screw or connecting pin is reusable or needs to be purchased separately before installation.
Find the exact replacement component
These product cards identify the manufacturer number for each component. Review the listing's current condition and included items before ordering.
Sea-Dog 270101-1 — Top cap
316 stainless steel · 1 in tubing
This is the 1-inch stainless end cap. Do not substitute 270100-1 on a different tube diameter.
Sea-Dog 273100-1 — Top cap
Black nylon · 7/8 in tubing
Black external top caps in a pair; distinguish from the black internal insert 273180-1.
Sea-Dog 273101-1 — Top cap
White nylon · 7/8 in tubing
White external nylon cap, not an insert; confirm the 7/8-inch round tube and 1/4-inch pin.
Sea-Dog 273180-1 — Top insert
Black nylon · 7/8 in tubing
This black fitting is an internal insert, not a cap over the outside of the tube.
Other Bimini hardware identification
Identify Sea-Dog Bimini jaw slides · Identify Sea-Dog rail bases
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