Spars, Rigging, and Hardware for Sailboats

Rig-Rite, Inc.
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Stemball Backing Shell Tangs


Stemball Backing Shells are designed to fit through a mounting slot in the mast while attached to a piece of Rigging with a Stemball wire swage 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 also commonly used with Swageless (mechanical) wire fittings and with specialized Rod Rigging fittings.
Note: When used with a fitting that will not pass through the hole, the Backing Shell becomes a part of the rigging assembly, and must be put on the wire before the ends are attached. In all cases it must be removed from the mast to take the rigging off.

Formed or cast Backing Shells install from outside through slot in mast for use with Stemball wire swage and Rod fittings. One or more Stemball Cup Washers are often required. Tangs are designed to fit through the mounting slot and are then fastened from the outside. Note: This type of tang actually becomes part of the rigging. It must be put on the wire before the wire is attached to the Mast. It must be removed from the mast to take the rigging off.

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. Cast Backing Shells are listed separately.   See also Stemball Cup Washers.

Round Stemball Backing Shell Tangs

Oval Stemball Backing Shell Tangs

Teardrop Shaped Stemball Backing Shell Tangs

Cast Stemball Backing Shell Tangs
 


Round Stemball Backing Shell Tangs
Round Stemball Backing 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). Ac

 

RR 86-BSR-5S

Round Stemball Backing 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). 

 

Round Stemball Backing 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). 

 

Round Stemball Backing Shell for 3/8" 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 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). 

 

RR 86-BSR-10S

Round Stemball Backing Shell for 7/16" 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). 

 

RR-86-BSR-12S

Oval Stemball Backing Shell Tangs
Oval Stemball Backing Shell for 3/16" & 5mm wire: RR 86-BSO-5:
Formed SS Stemball Backing Shell Tang for 3/16" and 5mm wire using standard Stemball fittings and appropriate Cup Washers. 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

 

RR 86-BSO-4

Oval Stemball Backing 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" high x 1 1/4" 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).

 

Oval Stemball Backing 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).

 

RR 86-BSO-7
Oval Stemball Backing Shell for 3/8" & 7/16" wire: RR 86-BSO-10:
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) 1/4" (6mm) 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).

 

RR 86-BSO-10


Teardrop Stemball Backing Shell Tangs
Teardrop Stemball Backing 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

 

RR 86-BST-4

Teardrop Stemball Backing 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

 

RR 86-BST-8

Cast Stemball Backing Shell Tangs
Cast SS Stemball Backing Shell for 4mm & 5mm wire: RR 86-BSC-45:
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.

 

Cast SS Stemball Backing Shell for 5mm & 6mm wire: RR 86-BSC-56:
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.

 

Cast SS Stemball Backing Shell for 7mm & 8mm wire: RR 86-BSC-78:
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.

 

Cast SS Stemball Backing Shell for 10mm wire: RR 86-BSC-10:
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.

 

Cast Alu. Stemball Backing Shell for 10mm, 11mm & 12mm wire: RR 86-BSC-1012:
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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