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Spars, Rigging, and Hardware for SailboatsRig-Rite, Inc. |
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Stemball Backing Shell Tangs |
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Spars, Rigging, and Hardware for SailboatsRig-Rite, Inc. |
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Stemball Backing Shell Tangs |
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Stemball Backing Shells are specialized Tangs
for use with a variety of Wire and Rod Stemball fittings.
Backing Shells are designed to fit through a mounting slot in the mast while already attached to
a piece of Rigging with a Stemball fitting; they are then fastened from the outside using one or
more screws or rivets.
One or more Stemball Cup Washers are often required.
Stemball Backing Shells are commonly used with Swage and Swageless (mechanical) wire fittings and
with specialized Rod Rigging fittings. Note: The Stemball Backing Shell becomes a part of the Rigging during assembly, as it must be put onto the Wire (or Rod) before the ends are attached. In all cases the Backing Shell must be removed from the mast to take the rigging off. When replacing Rigging it is recommended that the Stemball Backing Shells (and any Cup Washers) also be replaced, as interior wear is unavoidable in the design. Stemball Backing Shell Tangs come in Four basic Types.
Formed SS Backing Shells are identified by the shape of the portion of the Tang that protrudes
from the Mast after installation. Narrower Cast Backing Shells are listed separately. Round Stemball Backing Shell Tangs Oval Stemball Backing Shell Tangs |
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| Round Stemball Backing Shell Tangs | |
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Round Stemball Shell for 5/32" & 3/16" wire: RR 86-BSR-5S:
Formed SS Stemball Backing Shell Tang for 5/32" & 3/16", and 4mm & 5mm wire using standard Stemball fittings and appropriate Cup Washers. Mounts internally in mast cutout 1 3/4" (46mm) high x 1 1/4" (33mm) wide using (1) 3/16" (5mm) rivet. Plate is 3 3/16" (81mm) long x 1 7/16" (36mm) wide, and is contoured for use with most Mast Sections. Hole is 7/16" (11mm).
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Round Stemball Shell for 7/32" & 1/4" wire: RR 86-BSR-6S:
Formed SS Stemball Backing Shell Tang for 7/32" & 1/4", and 6mm wire using standard Stemball fittings and appropriate Cup Washers. Mounts internally in mast cutout 1 3/4" (46mm) high x 1 1/4" (33mm) wide using (1) 3/16" (5mm) rivet. Plate is 3 3/16" (81mm) long x 1 7/16" (36mm) wide, and is contoured for use with most Mast Sections. Hole is 9/16" (14.5mm).
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Round Stemball Shell for 9/32" & 5/16" wire: RR 86-BSR-8S:
Formed SS Stemball Backing Shell Tang for 9/32" & 5/16", and 7mm & 8mm wire using standard Stemball fittings and appropriate Cup Washers. Mounts internally in mast cutout 2 1/2" (64mm) high x 1 5/8" (42mm) wide using (1) 1/4" (6mm) rivet. Plate is 4" (101mm) long x 1 3/4" (45mm) wide, and is contoured for use with most Mast Sections. Hole is 11/16" (18mm).
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Round Stemball Shell for 3/8", 10mm wire: RR 86-BSR-10S:
Formed SS Stemball Backing Shell Tang for 3/8", and 9.5mm & 10mm wire using standard Stemball fittings and appropriate Cup Washers. Mounts internally in mast cutout 3" (77mm) high x 1 3/4" (45mm) wide using (1) 1/4" (6mm) rivet. Plate is 4 3/4" (122mm) long x 1 15/16" (49mm) wide, and is contoured for use with most Mast Sections. Hole is 7/8" (22mm).
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Round Stemball Shell for 7/16", 12mm wire: RR 86-BSR-12S:
Formed SS Stemball Backing Shell Tang for 7/16", and 11mm & 12mm wire using standard Stemball fittings and appropriate Cup Washers. Special reinforced, welded unit mounts internally in mast cutout 3 3/16" (82mm) high x 1 1/2" (50mm) wide using (1) 1/4" (6mm) rivet. Plate is 4 3/4" (122mm) long x 1 15/16" (49mm) wide, and is contoured for use with most Mast Sections. Hole is 7/8" (22mm).
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| Oval Stemball Backing Shell Tangs | |
| Oval Stemball Shell for 5/32", 3/16" & 4/5mm wire: RR 86-BSO-5: | |
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Formed SS Stemball Backing Shell Tang for 5/32" & 3/16" and 4 & 5mm wire using standard Stemball
fittings. Mounts internally in mast cutout 1 1/2" (38mm) high x 1" (25mm) wide using (1) 3/16"
(5mm) rivet. Plate is 2 9/16" (65mm) long x 1 1/4" (32mm) wide, and is contoured for use with
most Mast Sections. Hole is 3/8" (10mm). 1570
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Oval Stemball Shell for 7/32", 1/4"& 6mm wire: RR 86-BSO-6:
Formed SS Stemball Backing Shell Tang for 7/32" & 1/4", and 6mm wire using standard Stemball fittings and appropriate Cup Washers. Mounts internally in mast cutout 1 7/8" (48mm) high x 1 1/4" (32mm) wide using (2) 3/16" (5mm) rivets. Plate is 3 1/8" (80mm) long x 1 1/2" (38mm) wide, and is contoured for use with most Mast Sections. Hole is 9/16" (14mm).
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Oval Stemball Shell for 9/32" & 7mm wire: RR 86-BSO-7:
Formed SS Stemball Backing Shell Tang for 9/32" and 7mm wire using standard Stemball fittings and appropriate Cup Washers. Mounts internally in mast cutout 2 3/4" (70mm) high x 1 1/2" (39mm) wide using (1) 3/16" (5mm) rivet. Plate is 3 7/8" (98mm) long x 1 3/4" (46mm) wide, and is contoured for use with most Mast Sections. Hole is 9/16" (14.5mm).
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| Oval Stemball Shell for 3/8", 7/16" & 10/12mm wire: RR 86-BSO-10: | |
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Formed SS Stemball Backing Shell Tang for 3/8" & 7/16", and 9.5, 10, 11, & 12mm
wire using standard Stemball fittings and appropriate Cup Washers. Mounts internally in
mast cutout 3 5/8" (92mm) high x 2 3/8" (60mm) wide using (1) 3/16" (5mm) rivet.
Plate is 4 7/8" (123mm) long x 2 5/8" (67mm) wide, and is contoured for
use with most Mast Sections. Hole is 7/8" (22mm).
This item is no longer available having been replaced by the RR 86-BSO-10C, below.
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| Oval Stemball Shell for 3/8", 7/16" & 10/12mm wire: RR 86-BSO-10C: | |
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Cast SS Stemball Backing Shell Tang for 3/8" & 7/16", and 9.5, 10, 11, & 12mm
wire using standard Stemball fittings and appropriate Cup Washers. Mounts internally in
mast cutout 3 5/8" (92mm) high x 2 3/8" (60mm) wide using (1) 3/16" (5mm) rivet.
Investment cast unit is (maximum) 5 1/4" (133mm) long x 2 1/2" (63mm) wide, and is contoured for
use with most Mast Sections. Hole is 7/8" (22mm).
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| Teardrop Stemball Backing Shell Tangs | |
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Teardrop Stemball Shell for 1/8" & 5/32" wire: RR 86-BST-4:
Formed SS Stemball Backing Shell Tang for 1/8" & 5/32", and 4mm wire using standard Stemball fittings and appropriate Cup Washers. Mounts internally in tapered mast cutout 1 5/8" (42mm) high x (maximum) 1 1/8" (28mm) wide using (2) 3/16" (5mm) rivets. Mounting surface is slightly curved to fit a variety of mast surfaces. Plate is 3 3/16" (80mm) long x 1 1/4" (32mm) wide, hole is 3/8" (9.5mm). 40
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Teardrop Stemball Shell for 5/16" & 8mm wire: RR 86-BST-8:
Formed SS Stemball Backing Shell Tang for 5/16" and 8mm wire using standard Stemball fittings and appropriate Cup Washers. Mounts internally in tapered mast cutout 3 1/2" (90mm) high x (maximum) 2 1/8" (54mm) wide using (1) 3/16" (5mm) rivet. Mounting surface is slightly curved to fit a variety of mast surfaces. Plate is 4 3/8" (111mm) long x 2 5/16" (59mm) wide, hole is 11/16" (18mm). 80
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| Narrow Cast Stemball Backing Shell Tangs | |
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Cast SS Stemball Shell for 4mm & 5mm wire: RR 86-BSC-45:
Narrow Cast SS Stemball Backing Shell Tang for use with standard Stemballs for 4mm & 5mm wire (13.5mm head diameter), and some for 1/8" wire, do not require use of Cup Washers. Backing Shell mounts internally in mast cutout 35mm (1 3/8") high x 21mm (>13/16") wide. Unit is secured with (1) 6mm screw (included). Mounting surface is slightly curved to fit a variety of internal mast surfaces. Unit is 67mm (2 5/8") long x 21mm (>13/16") wide, hole is 10.5mm (>13/32"). Cast in 316 Stainless, unit is marked 423.
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Cast SS Stemball Shell for 5mm & 6mm wire: RR 86-BSC-56:
Narrow Cast SS Stemball Backing Shell Tang for use with standard Stemballs for 5mm & 6mm wire (20mm head diameter), and some for 7/32" & 1/4" wire, most do not require use of Cup Washers. Backing Shell mounts internally in mast cutout 46mm (1 3/8") high x 29mm (1 1/8") wide. Unit is secured with (1) 6mm screw (included). Mounting surface is slightly curved to fit a variety of internal mast surfaces. Unit is 81mm (3 3/16") long x 29mm (1 1/8") wide, hole is 16mm (5/8"). Cast in 316 Stainless, unit is marked 428.
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Cast SS Stemball Shell for 7mm & 8mm wire: RR 86-BSC-78:
Narrow Cast SS Stemball Backing Shell Tang for use with standard Stemballs for 7mm & 8mm wire (21mm head diameter), and some for 1/4" & 9/32" wire, most do not require use of Cup Washers. Backing Shell mounts internally in mast cutout 60mm (2 3/8") high x 36mm (>1 3/8") wide. Unit is secured with (1) 6mm screw (included). Mounting surface is slightly curved to fit a variety of internal mast surfaces. Unit is 100mm (<4") long x 36mm (>1 3/8") wide, hole is 19mm (3/4"). Cast in 316 Stainless, unit is marked 424.
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Cast SS Stemball Shell for 10mm wire: RR 86-BSC-10:
Narrow Cast SS Stemball Backing Shell Tang for use with standard Stemballs for 10mm wire (27mm head diameter), and some for 5/16" & 3/8" wire, does not require use of Cup Washers. Backing Shell mounts internally in mast cutout 75mm (<3") high x 45mm (1 3/4") wide. Unit is secured with (1) 6mm screw (included). Mounting surface is slightly curved to fit a variety of internal mast surfaces. Unit is 126mm (<5") long x 45mm (1 3/4") wide, hole is 21mm (>13/16"). Cast in 316 Stainless, unit is marked 426.
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| Cast Alu. Stemball Shell for 10mm, 11mm & 12mm wire: RR 86-BSC-1012: | |
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Cast Aluminum Stemball Backing Shell Tang for use with standard Stemballs for 10mm, 11mm & 12mm wire
(27mm head diameter), and some for 5/16" & 3/8" wire, Aluminum Shell requires use of SS
Cup Washer. Backing Shell mounts internally in mast cutout 105mm (4 1/8") high x 60mm (2 3/8") wide.
Unit is secured with (2) 8mm bolts (included). Mounting surface is slightly curved to fit a variety
of internal mast surfaces. Unit is 185mm (7 1/4") long x 60mm (2 3/8") wide, hole is 25mm (1").
4097
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