Spars, Rigging, and Hardware for Sailboats

Rig-Rite, Inc.
Phone: (001) 401-739-1140 -- FAX: (001) 401-739-1149
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U-Bolt Type Chainplates


U-Bolt Type Chainplates
U-Bolt Type Chainplates are designed for use with Upset Toggle Turnbuckles, which have a U-shaped strap at the bottom. They pass directly through the deck and an Angle Bracket or Tie-rod Block, and are secured with nuts on the lower side. Angle Brackets are normally bolted to a bulkhead, units with Tie-rod Blocks generally use a rod, or cable, to transmit stresses to a lower load bearing point.

U-Bolt Type Chainplates were rare in North American production boats (as far as we can remember, used only on the O'Day 20 and 22), until the advent of the Navtec U-Bolt Chainplate System. This System allowed for the installation of Chainplates virtually anywhere on deck, without regard for bulkhead placement, by utilizing a tie-rod arrangement, which transmitted loads to off-center locations, or, frequently out-of-view, structural members in the floor pan.
Navtec U-Bolt Chainplates start at 3/8" diameter for boats in the 30' (9M) range. They were commonly used on a variety of boats including Bristol, Cal, Caliber, C&C, Ericson, O'Day, Santa Cruz, Southern Cross, the Hobie 33, and others.

All U-Bolt Type Chainplates are listed below by the diameter of the U-Bolt threads.
See also, (non-U-Bolt) Deck Mount Chainplates.
 


1/4" U-Bolt Chainplates
1/4" U-Bolt Chainplate Assembly: CP UB-O22X:
Special 1/4" U-Bolt Chainplate Assembly as used on early O'Day 20's and 22's. This item is no longer available, having been replaced by the stronger CP UB-O22, below, after a number of early failures. Measurements are identical except that the new-style U-Bolt is made from heavier 5/16" stock.

 


5/16" U-Bolt Chainplates
5/16" U-Bolt Chainplate Assembly: CP UB-O22:
Special 5/16" U-Bolt Chainplate Assembly as used on later O'Day 22's. This item is identical to the original 1/4" CP UB-O22X, except that U-Bolt is made from heavier stock. Special U-Bolt Shroud Chainplate is formed from 5/16" rod on 1 3/4" centers, with a welded deck plate. Bolts extend 1 1/2" below deck surface and are secured with locknuts (included). This item was used with (2) SS Angle Brackets, CP UB-O22AB, below. As used on O'Day 20, 22 and Cal 22.

 

 

 

5/16" U-Bolt Chainplate - Angle Bracket: CP UB-O22AB:
Designed for use with CP UB-O22 centered on a 1/2" Bulkhead, SS Angle Brackets (2) are bolted together through Bulkhead to secure the lower end of U-Bolt Shroud Chainplate. Angle Bracket is 2 7/8" (max.) long x 3/4" wide and fastens to Bulkhead w/ (2) 1/4" bolts on 1" centers. Upper leg has 5/16" hole for U-Bolt. As used on O'Day 20 and 22.

 


Navtec U-Bolt Chainplates
The Navtec U-Bolt Chainplate System allows for the installation of a Chainplate virtually anywhere on deck, without regard for bulkhead placement, by utilizing a tie-rod arrangement, which transmits loads to off-center locations, or, frequently out-of-view, structural members in the floor pan. Original forged U-Bolts exhibited a propensity for stress-crack corrosion, later machined versions greatly reduced this likelihood. For any non-replacement applications, please consult our Engineering Department for recommendations.
 
3/8" Navtec U-Bolt Chainplates
3/8" Navtec U-Bolt Chainplate Assembly: Nav UBA-6S-2:
Navtec 3/8" U-Bolt Chainplate Assembly bolts through Deck to special Tie-rod Block which accepts SS tie-rod at a specific angle. Formed, flattened SS U-Bolt has 3/8" thread with 1 5/8" between centers, and extends 2" below deck surface. Note that some units were produced extending only 1 3/4" below deck, these are no longer stocked. Assembly includes U-Bolt with SS Top and bottom plates, lock washers and nuts. All components in this Assembly are Type 316 SS.
As used on a variety of boats including Bristol, Cal 28, C&C LF 38, Ericson, O'Day 30, the Hobie 33, and others.

 

 

 

3/8" U-Bolt Chainplate Backing Plate: Nav UB6-BP:
SS Backing Plate for single 3/8" U-Bolt Chainplate. SS Plate is 2 5/16" long x 3/4" wide x .050" thick, with (2) holes for U-Bolt on 1 5/8" centers.

 

 

 

3/8" U-Bolt Chainplate Tie-rod Block: Nav UB6-TRB-__:
3/8" U-Bolt Chainplate Tie-rod Block: Nav UB6-TRB-0:
3/8" U-Bolt Chainplate Tie-rod Block: Nav UB6-TRB-14S:
3/8" U-Bolt Chainplate Tie-rod Block: Nav UB6-TRB-23S:
Tie-rod Block for single 3/8" U-Bolt Chainplate. Anodized Aluminum Tie-rod Block is 2 9/16" long x 1 1/2" wide x 5/8" thick, with (2) recessed holes for nuts and washers, and a machined socket for 3/8" cold-headed tie-rod. Note: These items were produced with the socket machined for a wide variety of simple fore/aft or side, or compound tie-rod angles, please specify. Common configurations are listed here, but many others were produced. Most units are stamped with a number indicating the angle. If not, measure side and/or fore & aft angles between Block and Tie-rod on current installation.

 

 

 

 

 

 

3/8" Tie-rod for U-Bolt Chainplate: Nav UB-TR6-__:
3/8" Tie-rod for U-Bolt Chainplate is made from Nitronic 50 Rod. Tie-rod has formed head for Backing Plate socket, and 3/8" x 3" RH thread for Tie-rod nut. Available in any length, please specify overall length.

 

 
 

 

3/8" Tie-rod Nut for U-Bolt Chainplate: Nav UB-TRN6-1:
3/8" Tie-rod Nut for U-Bolt Chainplate is 1" OD x 2" long. Anodized Aluminum Tie-rod Nut has 3/8" RH thread for 3/8" Tie-rod.

 


 

 

3/8" U-Bolt Chainplate Backing Plate - Double: Nav UB6-BP2:
SS Backing Plate for two (2) 3/8" U-Bolt Chainplates. SS Plate is 2 5/16" long x 1 3/4" wide x .050" thick, with (4) holes for (2) U-Bolts 1" apart.

 

  3/8" U-Bolt Chainplate Tie-rod Block - Double: Nav UB6-TRB2-__:
 

 

Tie-rod Block for two (2) 3/8" U-Bolt Chainplates. Anodized Aluminum Tie-rod Block is 2 9/16" long x 2" wide x 5/8" thick, with (4) recessed holes for nuts and washers, and a machined socket for 1/2" cold-headed tie-rod. Note: These items were produced with the socket machined for a wide variety of simple fore/aft or side, or compound tie-rod angles, please specify. Most units are stamped with a number indicating the angle. If not, measure side and/or fore & aft angles between Block and Tie-rod on current installation.  mmmw

 

 
 

 

1/2" Tie-rod for U-Bolt Chainplate: Nav UB-TR8-__:
1/2" Tie-rod for U-Bolt Chainplate is made from Nitronic 50 Rod. Tie-rod has formed head for Backing Plate socket, and 1/2" x 3" RH thread for Tie-rod nut. Available in any length, please specify overall length.

 

 

 

1/2" Tie-rod Nut for U-Bolt Chainplate: Nav UB-TRN8-1.2:
1/2" Tie-rod Nut for U-Bolt Chainplate is 1 1/4" OD x 2" long. Anodized Aluminum Tie-rod Nut has 1/2" RH thread for 1/2" Tie-rod.

 

 

 

1/2" Tie-rod Nut for U-Bolt Chainplate: Nav UB-TRN8-1.5:
1/2" Tie-rod Nut for U-Bolt Chainplate is 1 1/2" OD x 2" long. Anodized Aluminum Tie-rod Nut has 1/2" RH thread for 1/2" Tie-rod.

 


1/2" Navtec U-Bolt Chainplates
 
1/2" Navtec U-Bolt Chainplate Assembly: Nav UBA-8S-2.5:
Navtec 1/2" U-Bolt Chainplate Assembly bolts through Deck to special Tie-rod Block which accepts SS tie-rod at a specific angle. Formed, flattened SS U-Bolt has 1/2" thread with 2 1/8" between centers, and extends 2 1/2" below deck surface. Note that some units were produced extending only 1" or 2" below deck, these are no longer stocked, but can be produced by cutting the longer ones, if necessary. Assembly includes U-Bolt with SS Top and bottom plates, lock washers and nuts. All components in this Assembly are Type 316 SS.
As used on a variety of boats including Bristol, Cal, C&C, Ericson, O'Day, Santa Cruz, Southern Cross, and others.

 

 

 

1/2" U-Bolt Chainplate Backing Plate: Nav UB8-BP:
SS Backing Plate for single 1/2" U-Bolt Chainplate. SS Plate is 3 1/16" long x 1" wide x .060" thick, with (2) holes for U-Bolt on 2 1/8" centers. new is .072

 

 

 

1/2" U-Bolt Chainplate Tie-rod Block: Nav UB8-TRB-__:
1/2" U-Bolt Chainplate Tie-rod Block: Nav UB8-TRB-0:
1/2" U-Bolt Chainplate Tie-rod Block: Nav UB8-TRB-12F:
1/2" U-Bolt Chainplate Tie-rod Block: Nav UB8-TRB-19S:
1/2" U-Bolt Chainplate Tie-rod Block: Nav UB8-TRB-21F:
Tie-rod Block for single 1/2" U-Bolt Chainplate. Anodized Aluminum Tie-rod Block is 3 5/16" long x 2" wide x 3/4" thick, with (2) recessed holes for nuts and washers, and a machined socket for 1/2" cold-headed tie-rod. Note: These items were produced with the socket machined for a wide variety of simple fore/aft or side, or compound tie-rod angles, please specify. Common configurations are listed here, but many others were produced. Most units are stamped with a number indicating the angle.

If not, measure side and/or fore & aft angles between Block and Tie-rod on current installation.

 

 

 

 

 

 

1/2" Tie-rod for U-Bolt Chainplate: Nav UB-TR8-__:
1/2" Tie-rod for U-Bolt Chainplate is made from Nitronic 50 Rod. Tie-rod has formed head for Backing Plate socket, and 1/2" x 3" RH thread for Tie-rod nut. Available in any length, please specify overall length.

 

 

 

1/2" Tie-rod Nut for U-Bolt Chainplate: Nav UB-TRN8-1.2:
1/2" Tie-rod Nut for U-Bolt Chainplate is 1 1/4" OD x 2" long. Anodized Aluminum Tie-rod Nut has 1/2" RH thread for 1/2" Tie-rod.

 

 

 

1/2" Tie-rod Nut for U-Bolt Chainplate: Nav UB-TRN8-1.5:
1/2" Tie-rod Nut for U-Bolt Chainplate is 1 1/2" OD x 2" long. Anodized Aluminum Tie-rod Nut has 1/2" RH thread for 1/2" Tie-rod.

 


 

 

1/2" U-Bolt Chainplate Backing Plate - Double: Nav UB8-BP2:
SS Backing Plate for two (2) 1/2" U-Bolt Chainplates. SS Plate is 3 1/16" long x 2 1/4" wide x .060" thick, with (4) holes for (2) U-Bolts 1 1/4" apart.

 

  1/2" U-Bolt Chainplate Tie-rod Block - Double: Nav UB8-TRB2-__:
 

 

Tie-rod Block for two (2) 1/2" U-Bolt Chainplates. Anodized Aluminum Tie-rod Block is 3 5/16" long x 2 1/2" wide x 3/4" thick, with (4) recessed holes for nuts and washers, and a machined socket for 5/8" cold-headed tie-rod. Note: These items were produced with the socket machined for a wide variety of simple fore/aft or side, or compound tie-rod angles, please specify. Most units are stamped with a number indicating the angle. If not, measure side and/or fore & aft angles between Block and Tie-rod on current installation.

 

 

 

5/8" Tie-rod for U-Bolt Chainplate: Nav UB-TR10-__:
5/8" Tie-rod for U-Bolt Chainplate is made from Nitronic 50 Rod. Tie-rod has formed head for Backing Plate socket, and 5/8" x 3" RH thread for Tie-rod nut. Available in any length, please specify overall length.

 

 
 

 

5/8" Tie-rod Nut for U-Bolt Chainplate: Nav UB-TRN10-1.5:
5/8" Tie-rod Nut for U-Bolt Chainplate is 1 1/2" OD x 4" long. Anodized Aluminum Tie-rod Nut has 5/8" RH thread for 5/8" Tie-rod.

 


3/4" Navtec U-Bolt Chainplates
3/4" Navtec U-Bolt Chainplate Assembly: Nav UBA-12S-4:
Navtec 3/4" U-Bolt Chainplate Assembly bolts through Deck to special Tie-rod Block which accepts SS tie-rod at a specific angle. Fabricated from machined components, without welding, U-Bolt assembly has 3/4" thread with 3 3/8" between centers, and extends 4" below deck surface. Assembly includes U-Bolt with SS Top plate, lock washers and nuts. As used on a variety of boats including Bristol, C&C, O'Day, Southern Cross and others.

 

 

 

3/4" U-Bolt Chainplate Backing Plate: Nav UB12-BP:
SS Backing Plate for single 3/4" U-Bolt Chainplate. SS Plate is 5 1/8" long x 1 13/16" wide x 1/8" thick, with (2) holes for U-Bolt on 3 3/8" centers.

 

 
 

 

3/4" U-Bolt Chainplate Tie-rod Block: Nav UB12-TRB-__:
3/4" U-Bolt Chainplate Tie-rod Block: Nav UB12-TRB-10S:
Tie-rod Block for single 3/4" U-Bolt Chainplate. Anodized Aluminum Tie-rod Block is 4 13/16" long x 2 3/4" wide x 1 1/4" thick, with (2) recessed holes for nuts and washers, and a machined socket for 3/4" cold-headed tie-rod. Note: These items were produced with the socket machined for a wide variety of simple fore/aft or side, or compound tie-rod angles, please specify. Common configurations are listed here, but many others were produced. Most units are stamped with a number indicating the angle. If not, measure side and/or fore & aft angles between Block and Tie-rod on current installation.

 

 
 

 

3/4" Tie-rod for U-Bolt Chainplate: Nav UB-TR12-__:
3/4" Tie-rod for U-Bolt Chainplate is made from Nitronic 50 Rod. Tie-rod has formed head for Backing Plate socket, and 3/4" x 4" RH thread for Tie-rod nut. Available in any length, please specify overall length.

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