Sea-Dog 270100-1 — Top cap
316 stainless steel · 7/8 in tubing
A metal end cap for 7/8-inch round frame tubing; manufacturer's set screws are sold separately.
Sea-Dog Bimini Top Caps & Inserts: Tube Diameter and Material Guide
A Bimini top cap is not the same part as a top insert. These Sea-Dog end fittings provide the pivot connection at a canopy frame tube, but they differ in how they seat on the tubing and in the material used. Match the exact outside diameter and pin size, rather than ordering by colour alone.
Choosing a Bimini top cap or insert
316 stainless caps
270100-1 fits 7/8-inch OD tubing and 270101-1 fits 1-inch OD tubing. Both use a 1/4-inch pivot pin. Set screws are purchased separately.
Black and white nylon caps
273100-1 (black) and 273101-1 (white) are UV-resistant nylon top caps for 7/8-inch round tubing, supplied as pairs.
Nylon insert, not a cap
273180-1 is a black nylon top insert that seats inside a compatible 7/8-inch round tube. It also uses a 1/4-inch pin.
Check the mating frame
Pin diameter, tube outside diameter, and cap-versus-insert attachment must all match. The manufacturer references 0.049-inch stainless tube wall thickness.
Sea-Dog Bimini top fitting comparison
Compare the part numbers below; a matching pin diameter alone does not establish that a cap or insert will fit your frame.
| 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.
How to select the correct fitting
- Measure the Bimini frame tube's outside diameter, especially when replacing a fitting on an older frame.
- Inspect how the old part attaches: top caps fit over the tube end, while inserts seat inside it.
- Match the 1/4-inch pin size and the correct original fitting, not only the visible colour.
- Allow for separate fasteners on the stainless cap models. The manufacturer's set screw reference is 299999-1; it uses a 1/8-inch Allen wrench.
Shop Sea-Dog Bimini end fittings
Each card links to its exact manufacturer-numbered product in this store. These are separate fittings, not complete Bimini assemblies.
Sea-Dog 270101-1 — Top cap
316 stainless steel · 1 in tubing
A stainless end cap for larger 1-inch round tube, not the 7/8-inch variant.
Sea-Dog 273100-1 — Top cap
Black nylon · 7/8 in tubing
UV-resistant black nylon end caps for 7/8-inch Bimini tubing; supplied as a pair.
Sea-Dog 273101-1 — Top cap
White nylon · 7/8 in tubing
White nylon version of the 7/8-inch external cap, supplied in a pair.
Sea-Dog 273180-1 — Top insert
Black nylon · 7/8 in tubing
A black nylon top insert that sits inside a compatible 7/8-inch OD Bimini tube; sold as a pair.
Related Bimini hardware guides
Sea-Dog Bimini jaw slides  · Sea-Dog stainless rail bases
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