Sea-Dog 290901-1
A standard 90-degree tee for assembling a compatible 1-inch handrail connection.
Sea-Dog 1-Inch Handrail Tees: Universal vs Hinged 90° Fittings
Sea-Dog offers two 90-degree handrail tee designs for 1-inch boat railing: a conventional universal fitting and a hinged version. Both are investment-cast 316 stainless steel, but the hinged design is useful where a rail is already assembled and a standard tee cannot easily be slid into place.
Choosing the right 90-degree handrail tee
Conventional rail connection
290901-1 is the 1-inch, 90-degree universal tee, appropriate when the rail can be assembled around it.
Hinged installation
290904-1 opens around an existing 1-inch rail, helping avoid sliding the fitting down the tube.
Stainless construction
Both are investment-cast 316 stainless steel and use a 0.049-inch stainless tubing wall reference.
Set-screw details
Sea-Dog says set screws are included where appropriate and lists 299999-1 as the separately available replacement.
Sea-Dog handrail tee comparison chart
| Part number | Style | Tube OD | Material | Assembly |
|---|---|---|---|---|
| 290901-1 | 90° universal tee | 1 inch | 316 stainless steel | Conventional |
| 290904-1 | 90° hinged tee | 1 inch | 316 stainless steel | Hinged |
Sea-Dog specifies a 0.049-inch stainless tube wall reference. The manufacturer's handrail tee range includes set screws where appropriate; replacements are identified as 299999-1. A 1/8-inch Allen wrench is specified for installation. Match the original rail design before ordering.
Check the fit before installation
- Confirm the rail tube is 1 inch outside diameter.
- Verify a 90-degree tee is needed; the manufacturer also makes 60-degree versions under other MPNs.
- Use a hinged fitting where the original rail cannot conveniently be dismantled.
- Check set-screw requirements and follow the manufacturer's installation guidance.
Shop Sea-Dog one-inch handrail fittings
Both linked items belong to this store and are sold individually under their corresponding manufacturer part numbers.
Sea-Dog 290904-1
The hinged 90-degree tee can fit around existing tubing, reducing the need to dismantle the rail.
More marine rail hardware
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