Spars, Rigging, and Hardware for Sailboats

Rig-Rite, Inc.
Phone: (001) 401-739-1140 -- FAX: (001) 401-739-1149
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Rod Stemballs


Rod Stemballs were developed by Navtec with the aim of increasing the useful life of rod rigging. The Stemball builds on the weight-saving approach of a simple ball terminal for rod. Stemball rigging systems provide significant fatigue life with minimal weight and size increase. Used to attach Rod Rigging to the Mast with Rod Stemball Tangs, Micro Tangs, and also used with a variety of Spreader Tip Cups.
See also, other Rod Rigging Components.
 

  Rod Stemballs

F220, F221 - Tapered Stemballs
F222 - Titanium Tapered Stemballs
F230, F231 - Fatigue Indicating Stemballs
F210X - Straight-Shank Stemballs
F235, F245 - Micro Stemballs

M523 - NG1 & NG2 Removable Rod Stemballs

OS 57 - Stemballs w/ Socket
 


  Navtec Tapered Stemballs - F220
Industry-standard Navtec Tapered Rod Stemballs are turned from 316 Stainless Steel.
 
 Part #  Rod Size  Head Diameter  Max. Shank Diameter  Length OA  
  Nav F220-004  -4  .48"  .281"  1 1/16"  50
  Nav F220-006  -6  .55"  .312"  1 1/8"  50
  Nav F220-008  -8  .68"  .402"  1 3/8"  22
  Nav F220-010  -10  .68"  .402"  1 1/2"  
  Nav F220-012  -12  .77"  .464"  1 11/16"  
  Nav F220-015  -15  ."  ."  "  000
  Nav F220-017  -17  .91"  .562"  2"  1
  Nav F220-022  -22  1.03"  .625"  2 1/16"  13
  Nav F220-030  -30  1.19"  .72"  2 5/8"  
  Nav F220-040  -40  1.38"  .84"  3"  
  Nav F220-048  -48  1.53"  .96"  3 3/8"  
  Nav F221-012-01  -.312  .77"  .464"  1 11/16"  34
  Nav F221-022-03  -12  1.03"  .625"  2 1/16"  1

 


  Navtec Titanium Tapered Stemballs - F222
Produced to the same dimensions as the Industry-standard Navtec F220 Tapered Rod Stemballs, Titanium Stemballs are approximately half the weight of the Stainless Steel version. Available in limited sizes.
 
 
 Part #  Rod Size  Head Diameter  Max. Shank Diameter  Length OA  
  Nav F222-010  -10  .68"  .402"  1 1/2"  30
  Nav F222-012  -12  .77"  .464"  1 11/16"  16
  Nav F222-030  -30  1.19"  .72"  2 5/8"  1
  Nav F222-030-01  -.463"  1.19"  .72"  2 5/8"  3
  Nav F222-040-01  -.406"  1.38"  .84"  3"  2
  Nav F222-040-02  -48  1.38"  .84"  3"  001

 


  Navtec Fatigue Indicating Stemballs - F230
With Head dimensions as Industry-standard Navtec F220 Tapered Rod Stemballs, Fatigue Indicating Stemballs are longer, featuring a recess at the length of the standard Tapered Rod Stemballs designed to break off and slide down the Rod to indicate incipient bending stresses in advance of failure.
 
 
 Part #  Rod Size  Head Diameter  Max. Shank Diameter  Length OA  
  Nav F230-004  -4  .48"  .281"  1.64"  19
  Nav F230-006  -6  .55"  .312"  1.88"  000
  Nav F230-008  -8  .68"  .402"  2.14"  1
  Nav F230-010  -10  .68"  .402"  2.38"  18
  Nav F230-012  -12  .77"  .464"  2.68"  8
  Nav F230-017  -17  .91"  .562"  3.14"  33
  Nav F230-022  -22  1.03"  .625"  3.57"  14
  Nav F230-030  -30  1.19"  .72"  4.16"  
  Nav F230-040  -40  1.38"  .84"  4.76"  9
  Nav F230-048  -48  1.53"  .96"  5.35"  1
  Nav F230-060  -60  1.66"  .99"  6.28"  2
  Nav F230-076L  -76LR  1.93"  1.08"  6.71"  4
  Nav F230-091L  -91LR  2.10"  1.27"  7.31"  8
  Nav F230-115L  -115LR  2.20"  1.31"  8.33"  4
  Nav F230-260  -260  3.31"  1.97"  12.49"  1
  Nav F231-060-01  -.705"  1.66"  .96"  6.28"  2

 


  Navtec Straight-Shank Stemballs - F210X
Early Navtec Type 1 Straight-Shank Stemballs have Head dimensions that are the same as F220 Tapered Rod Stemballs, but Shank is tapered on the inside. Available in limited sizes.
 
 
 Part #  Rod Size  Head Diameter  Max. Shank Diameter  Length OA  
  Nav F210-004  -4  .48"  .281"  1 3/4"  099
  Nav F210-006  -6  .55"  .312"  1 15/16"  99
  Nav F210-010  -10  .68"  .402"  2 1/2"  14
  Nav F210-017  -17  .91"  .562"  3 1/4" 180
  Nav F210-022  -22  1.03"  .625"  3 11/16"  50

 


  Navtec Micro Stemballs - F235, F245
Smaller than Navtec F220 Tapered Rod Stemballs, Micro Stemballs are approximately half the weight. Used exclusively with Micro Tangs, Micro Tip Cups, Micro Stemball Navtangs, and Custom Racing Tangs.
 
 Part #  Rod Size  Head Diameter  Max. Shank Diameter  Length OA  
  Nav F235-004  -4  .37"  .25"  1.04"  111
  Nav F235-006  -6  .43"  .29"  1.20"  
  Nav F235-008  -8  .49"  .32"  1.36"  
  Nav F235-010  -10  .54"  .36"  1.51"  
  Nav F235-012  -12  .61"  .41"  1.70"  
  Nav F235-015  -15  ."  ."  "  000
  Nav F235-017  -17  .71"  .48"  2.00"  
  Nav F245-.330  -17  .71"  Titanium  .48"  Titanium  2.00"  1
  Nav F235-022  -22  .81"  .54"  2.27"  
  Nav F235-030  -30  .95"  .66"  2.64"  
  Nav F235-437-01  -30  1.08"  .76"  3.02"  2
  Nav F235-040  -40  1.08"  .76"  3.02"  
  Nav F235-535-02  -.535"  1.22"  .85"  3.40"  1
  Nav F235-048  -48  1.22"  .85"  3.40"  
  Nav F235-562-02  -48  1.43"  1.01"  3.99"  1
  Nav F235-605-02  -.605"  1.43"  1.01"  3.99"  1
  Nav F235-060  -60  1.43"  1.01"  3.99"  
  Nav F235-076  -76  1.53"  1.02"  4.27"  4

 


  NG1 & NG2 Removable Stemballs - M5233
These Removable Rod Stemballs were designed specifically for use in Isomat, Z-Spar, and other masts with seats or tangs for Stemballs, commonly found in Mastheads and Spreader Bases. These Stemballs have head diameters equal to wire-rope Stemballs of equivalent strength. Two-piece construction allows use with tangs too small to allow for passage of rod turnbuckle studs - the Stemball can be inserted through the tang before the rod socket is attached to it. As with all components of the Merriman Rod system, Removable Socket is secured with a machine screw, allowing for inspection of the rod head at any time, as well as complete reusability. Complete with one Stemball Cup, NG1 Stemballs can be converted for use in NG2 applications, using NG2-CW20 Cup Washer. *Head Diameter with included Stemball Cup.
 
 
 Part #  Rod Size  Head Style  Head Diameter*  Shank Diameter  Length OA  
  Mer 5233-004   -4  NG1  1" (26mm)  .422"  4 3/8"  001
  Mer 5233-006   -6  NG1  1" (26mm)  .422"  4 1/2"  
  Mer 5233-008   -8  NG1  1" (26mm)  .487"  5 1/4"  
  Mer 5233-010   -10  NG1  1" (26mm)  .487"  5 1/4"  
  Mer 5233-012   -12  NG2  1 5/16" (34mm)  .630"  5 7/8"  
  Mer 5233-017   -17  NG2  1 5/16" (34mm)  .630"  5 7/8"  
  Mer 5233-022   -22  NG2  1 5/16" (34mm)  .740"  6"  

 


  OS Stemballs w/ Socket - 57-
Rod Stemballs with Socket for use in applications where a standard Stemball is not optimal. In most applications use requires 1 or more Stemball Cup Washers. All OS Sockets feature a pre-drilled hole to simplify 'dinging'.
 
 Part #  Rod Size  Head Diameter  Shank Diameter  Length OA  
  OS 57380045   -4  3/4" (19mm)  9.5mm  3" (75mm)  001
  OS 57716050   -6  13/16" (20mm)  11mm  3 1/8" (80mm)  
  OS 57716057   -8  13/16" (20mm)  11mm  3 1/8" (80mm)  
  OS 57120064   -10  13/16" (20mm)  12.7mm    
  OS 57120071   -12  13/16" (20mm)  12.7mm    
  OS 57180071   -12  1 1/16" (27.4mm)  16mm    
  OS 57580075   -15  1 1/16" (27.4mm)  16mm    
  OS 57580084   -17  1 1/16" (27.4mm)  16mm    
  OS 57340095   -22  1 1/16" (27.4mm)  20mm    
  OS 57780111   -30  1 3/8" (35mm)  22mm    
  OS 57100127   -40  1 1/2" (39mm)  25.4mm    

 


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