Sparcraft FM-50 Mast

FM-50 Fractional Masthead Assembly: FM50-1FA: Fractional Rig Masthead is standard on most FM-50 Masts. Cast aluminum Masthead includes provisions for Backstay and (2) upper shrouds using Stemball fittings, upper shrouds are internal and exit through slots near the top of the Mast Section. Assembly includes a single Main halyard Sheave, FM0-3, on an 8mm 'Drop-in' Sheave Axle, FM0-6. Masthead casting is (maximum) 7 5/8" (195mm) long x 2 15/16" (74mm) wide. Backstay Stemball seat (center) is 57mm (2 1/4") aft of Mast Section.
	FM0 Masthead Sheave: FM0-3: Black Delrin Sheave is 40mm (1 9/16") OD x 10mm (3/8") wide x 8mm (5/16") ID. Used in FM50-1FA Masthead Assembly. SM40R10-8
	FM0 Masthead Sheave Axle: FM0-6: SS 'Drop-in' Sheave Axle pin is 8mm (5/16") dia. x 18mm (<3/4") long. Used for Sheave Axle in FM50-1FA Masthead Assembly.

FM-50 Mast – Tangs A wide variety of Tangs are used on the FM-50 Mast Section, but most commonly used are Stemball Backing Shell Tangs. See also, other Tangs.

FM-50 Mast – Jib Boxes & Forestay Attachments Several other varieties of Jib Boxes and Forestay Attachments are used on the FM-50 Mast Section, See Isomat Jib Boxes and Forestay/Staysail Tangs.
*WE Double Jib Box Ass'y w/ Stemball Socket: FM0-30A:* Cast aluminum two (2) halyard internal Jib Box Assembly with Stemball Socket for Fractionally rigged Masts. Accommodates two (2) Jib halyards up to 5/16" (8mm) diameter, and features a 20mm Stemball Socket for Forestay attachment. Assembly uses (2) 40mm (1 9/16") Delrin Sheaves, FM0-3, for Jib halyards on an 8mm Axle, FM0-6L. Assembly fits in mast cutout 3" (76mm) high x 1 1/2" (37mm) wide. Assembly is designed to fit through the mounting slot and is then pulled down, a screw or rivet is then installed above the casting to keep it locked in place. Unit measures (maximum) 3 7/8" long x 1 11/16" wide and projects 1 1/4" (maximum) inside of mast. Commonly used with FM-35 thru FM-101 Mast Sections.
	FM0 Jib Box Sheave: FM0-3: Black Delrin Sheave is 40mm (1 9/16") OD x 10mm (3/8") wide x 8mm (5/16") ID. Used for Jib halyard sheaves in FM0-30A Jib Box. SM40R10-8
	FM0 Jib Box Sheave Axle: FM0-6L: SS 'Drop-in' Sheave Axle pin is 8mm (5/16") dia. x 31mm (1 1/4") long. Used for Sheave Axle in FM0-30A Jib Box.

FM-50 Mast – Exit Blocks Several varieties of Exit Blocks are used on the FM-50 Mast Section, See Isomat Exit Blocks.

FM-50 Mast – Spreaders The FM-50 Mast Section is commonly (but not always) used with BF-2 Spreaders. Standard Spreader Bases are listed below, for Spreaders, Spreader Parts, and other Spreader Bases, See Sparcraft Spreaders & Components.

FM-50 Mast – Spreader Bases
Spreader Base Clevis Pin: BF2-30: Attaches BF2 Spreader to standard Cast Aluminum Base. SS Clevis Pin is 8mm diameter x 22mm (7/8") long.
BF-2 Cast Spreader Base - Port: BF2-35P: BF-2 Cast Spreader Base - Starboard: BF2-35S: Unique spreader base design incorporates socket for use with stemballs on lower shrouds. Cast aluminum base fits into a 18mm (11/16") high x 53mm (2 1/8") wide slot in the mast and is locked in place with (1) 3/16" rivet. Base accommodates a variety of spreader angles depending on how the inboard spreader end is cut. BF-2 Spreader is attached with (1) 8mm clevis pin. Base (visible when installed) measures 1 9/16" high x 3" long, and projects 2 7/8" out from the Mast. Commonly used with FM-35 thru FM-101 Mast Sections.

FM-50 Mast – Spreader Bars
*Rectangular Aluminum Spreader Bar for BF-2 Spreader: BF2-40-0:*
Aluminum Spreader Bar for BF2 Spreader is 11 3/4" long x 12mm thick x 20mm wide (1/2" x 13/16"), and incorporates a 5 degree vertical angle for 0 degree (in-line) Spreaders. When ordering please specify Mast Section. Also available with a variety of sweep-back angles on special order.
*SS Spreader Bar for BF-2 Spreader, 30� aft: BF2-41-30:* Rectangular Stainless Steel Spreader Bar for BF2 Spreaders angled 30 degrees aft is (maximum) 10 5/8" long x 19mm wide x 12.5mm thick incorporates a 5 degree vertical angle. As used on Hunter 240 and 260 with FM-35 and FM-67 Mast Sections.
*SS Doubler Plate for BF-2 Spreader Bar: BF2-40N:* Formed SS Doubler Plate is formed to fit NG-28 Mast Section and reinforces it for use with any BF2 Rectangular Spreader Bar. Unit features boss to allow a straight cut on the spreader end. Plates (2 required) are attached to the mast with (4) 3/16" rivets, and have 12mm x 25mm (1/2" x 1") Slot for BF2-40 Spreader Bars. Plate is (maximum) 2 7/8" (75mm) long x 2" (50mm) high. For use with FM-35 thru FM-101, NG-28 and similar Mast sections.

Note: Aluminum and SS Spreader Bars for BF2 Spreaders also available in a variety of lengths and angles not listed here, and are sometimes machined for use with a variety of wire and rod Stemballs. When inquiring please specify Mast Section, sweepback angle, and rigging configuration.

FM-50 Mast – Spinnaker Cars Spinnaker Cars on the FM-50 Mast Section, normally run of one of several sizes of added T-Track, See Spinnaker Cars for T-Track.
FM1 Spinnaker Pole Mast Eye: FM1-37: Fixed Eye for attachment of whisker or spinnaker pole on the front of the mast. Used where vertical adjustment of inboard pole end is not required, Cast SS Pole eye is curved to fit the front of the Mast. Base is 46mm (1 3/4") high x 47mm (1 7/8") wide, and attaches to Mast with (4) 3/16" (5mm) screws or rivets on 32mm vertical x 35mm centers. 8mm Ring has 40mm (1 1/2") ID. Used with FM-35 through FM-101, and other Mast Sections. Part is marked 33501000114.

FM-50 Mast – Exit Plates Several varieties of Exit Plates are used on the FM-50 Mast Section, See Isomat Exit Plates.

FM-50 Mast – Cleats Several sizes of Cleats are used on the FM-50 Mast Section, See Isomat Cleats.

FM-50 Mast – Mainsail Gates & Feeders
FM1 SS Boltrope Feeder: FM1-BRF: SS Boltrope Feeder fits FM-35 through FM-101 Mast Sections. Cast SS Feeder is 3" (78mm) long x (maximum) 1 5/8" (42mm) wide and attaches to mast with (4) 3/16" (5mm) rivets on 28mm x 64mm vertical centers. Unit requires 65mm x 14mm cut-out in the Mast track. Replaces earlier Plastic version and fits in same cut-out. Part is marked 34203000034.

FM-50 Mast - Gooseneck Brackets & Hardware The FM-50 Mast Section is normally used with NG1 Gooseneck Brackets, for Booms up to FB125.
NG1 Narrow Gooseneck Bracket: NG1-11N: Cast aluminum Gooseneck/Vang Bracket is used on a variety of smaller FM Mast Sections. It is compatible with all FB and NB Goosenecks that use a 12mm Pin. Bracket is 3 7/8" (98mm) high x 1 15/16" (49mm) wide, and is fastened with four (4) 1/4" (6mm) rivets. Bracket has 12mm (7/16") holes for use with any of the NB1-1 Vertical Gooseneck Toggle Pins, below. Commonly used with FM-35 thru FM-101 Mast Sections.
	NB1 Gooseneck Pin Ass'y w/ Reef Hooks: NB1-1RA: Stainless Steel Reef Hook/Tack Assembly incorporates 12mm Vertical Gooseneck Bolt with Tack Shackle and dual Reef Hooks. Reef Hooks are formed from 8mm rod, Assembly is (maximum) 3 5/8" wide x 6" high, and includes 5mm SS Tack Shackle. Bolt is 12mm diameter x 3 5/8" long for use with any of the NG1-11 Gooseneck Brackets and a variety of Gooseneck Toggles for a 12mm Pin.
	NB1 Gooseneck Connector Kit: NB1-1K: NB1 Gooseneck Connector Kit for applications not requiring Reef Hooks. Kit has everything necessary to connect Gooseneck Casting to Mast Bracket and includes all 4 of the components below, NB1-1, NB1-2, NB1-3 and *NB1-4.*
	NB1 Vertical Gooseneck Pin: NB1-1: SS Clevis pin is 12mm (7/16") diameter with a 85mm (3 3/8") grip length, and has 8mm (5/16") hole for Shackle attachment. Fits vertically in any of the NG1-11 Gooseneck/Vang Brackets.
	NB1 Horizontal Gooseneck Cylinder: NB1-3: Plastic Cylinder slides through the Gooseneck Casting and the Gooseneck Toggle. Vertical Gooseneck Pin then slides through Mast Bracket, Gooseneck Toggle, and Horizontal Gooseneck Cylinder, in that order. Black plastic cylinder is 1" diameter x 1 1/2" long with hole for 12mm (7/16") pin.
	NB1 Gooseneck Toggle: NB1-4: Plastic Toggle fits in between the ears in the Gooseneck Casting. Horizontal Gooseneck Cylinder then slides through the Gooseneck Casting and the Gooseneck Toggle. All 3 pieces are held together by the Vertical Gooseneck clevis Pin.
	NB1 Tack Shackle: NB1-2: SS Tack Shackle fits through hole in top of vertical gooseneck clevis pins. Shackle has 5mm (3/16") pin.

FM-50 Mast – Winch Pads
*FM-50 Aft Winch Pad - Clear Anodized: FM50-21:* Formed aluminum Bracket fits aft side of FM-50 Mast Section. Designed to mount under the Boom for use with a Reef line winch. Winch mounting surface on Bracket is 4" (100mm) square and angles aft approximately 12 degrees to align Winch with Outhaul or Reef lines exiting from Boom. Anodized Bracket fastens to Mast with eight (8) 3/16" (5mm) rivets. 751226,67 NS

FM-50 Mast - Vang Brackets & Hardware Vang Brackets and Toggles used on the FM-50 Mast Section are listed below. For other Vang Toggles used with these Brackets, See NG1 Vang Toggles.
NG1 Vang Bracket Ass'y w/ Toggle for Rope Vang: NG1-16NA: Complete NG1 Vang Bracket Assembly has Toggle with Slot for attachment of Rope (soft) Vang. Assembly consists of Narrow Vang Bracket (NG1-11N), Vang Toggle Pin (NB1-1), and NG1-16 Vang Toggle with 3/8" x 7/8" (10mm x 22mm) Slot. Assembly is fastened to Mast with four (4) 1/4" (6mm) rivets or screws. Toggle can be replaced for later conversion to a Hard (solid) Vang.
	NG1 Narrow Gooseneck Bracket: NG1-11N: Cast aluminum Gooseneck/Vang Bracket is used on a variety of smaller FM Mast Sections. It is compatible with all FB and NB Goosenecks that use a 12mm Pin. Bracket is 3 7/8" (98mm) high x 1 15/16" (49mm) wide, and is fastened with four (4) 1/4" (6mm) rivets. Bracket has 12mm (7/16") holes for use with any of the NB1-1 Vertical Gooseneck Toggle Pins, below. Commonly used with FM-35 thru FM-101 Mast Sections.
	NB1 Gooseneck/Vang Vertical Toggle Pin: NB1-1: SS Clevis pin is 12mm (7/16") diameter with a 85mm (3 3/8") grip length, and has 8mm (5/16") hole for Cotter Ring or Block attachment.
	NG1 SS Vang Toggle w/ Slot for Rope Vang: NG1-16: SS Welded Vang Toggle with Slot for attachment of Block or Shackle fits *NG1-11* Vang Bracket. SS tube is 1 15/16" (50mm) long and is drilled for 12mm Vertical Pin, *NB1-1.* Welded SS Tab has Slot (3/8" x 7/8") suitable for attachment of most any shackle. Heavy-duty Tab is 7mm (.280") thick and projects 2" (50mm) out from tube.

FM-50 Mast - Mast Steps
FM-50 Hinged Mast Step Ass'y w/ Sheaves: FM0-2A: Aluminum Hinged Mast Step Assembly for use with FM-35 and FM-50 Mast Sections incorporates (12) Sheaves, FM0-2S, to allow for leading up to six (6) lines straight out or aft, at Deck level. Upper portion attaches to the Mast using (4) 3/16" (6mm) rivets, and has (2) 6mm holes to allow for Vang attachment. Upper and Base Plate hinge on 8mm (5/16") Pin. Base Plate attaches to Deck with (4) 6mm (1/4") FH screws. Unit places Mast tube at 40mm above Deck. WE 0570
	FM-50 Hinged Mast Step Sheave: FM0-2S: Replacement Sheave for FM0-2A Hinged Mast Step Assembly. Black plastic Sheave is 25mm (1") OD x 10mm (3/8") wide x 8mm (5/16") ID. SM25R10-8
	FM-50 Hinged Mast Step, Sheave Axle: FM0-2SA: Replacement Sheave Axle for FM0-2A Hinged Mast Step Assembly. Solid SS Sheave Axle is 8mm x 110mm long (5/16" x 4 5/16").
	FM-50 Hinged Mast Step, Sheave Cover Plate: FM0-2CP: Replacement Sheave Cover Plate only as used in FM0-2A Hinged Mast Step Assembly, above. Black anodized Plate is 110mm (4 3/8") long x 92mm (3 5/8") wide x 3mm thick with holes for vertical sheave axles.
	FM-50 Hinged Mast Step, Insert Casting only: FM0-2B: Replacement Upper Casting only as used in FM0-2A Hinged Mast Step Assembly, above. Black anodized Casting is 150mm (6") long x 90mm (3 9/16") wide and incorporates (6) 8mm vertical sheave axles. WE
	FM-50 Hinged Mast Step, Base Plate: FM0-2D: Deck-mounted Base Plate only, used in Hinged Mast Step Assembly, FM0-2A, above, has ears on aft side with 8mm (5/16") hole for hinge Pin. Cast Aluminum Base Plate is 5 1/4" (133mm) long x 2 3/4" (70mm) wide and attaches to Deck with (4) 6mm (1/4") FH screws on 3 5/16" (84mm) (fore & aft) x 1 13/16" (46mm) (athwartships) centers. WE 5651

FM-50 Internal Waterproofing Plug: FM50-WP: Internal Waterproofing Plug is installed in Keel-stepped Masts to prevent water intrusion below deck. Assembly consists of 2 plastic pieces carefully cut to fit Mast interior with central PVC standpipe to allow passage of electrical wires. Unit slides up from the bottom of the Mast to a point just above Deck level where a hole is drilled in Mast to allow for application of expanding foam between plastic pieces. Second hole is drilled just above upper plastic piece to allow water drainage.
	Internal Waterproofing Foam: NGA-Foam: Expanding foam is used for installation of Internal Waterproofing Plug. Single-use can is sufficient for installation of any Internal Waterproofing Plug.

Common Mast usage: Bavaria 606, 707; Dehler 18, 22; Edel 660; Fun 23; Gin 730; Graczyk 7.3M; HD 785SK; Jantar 21; JK 20er; Leisure 22; Neptun 22; RW 26; Sunbeam 22, 23; Unna 20; Waarship 570, 660;
See also Sparcraft Booms, and Sparcraft Spreaders. See also, Sparcraft FM Masts, and other Sparcraft Mast Sections.

FM-50 Mast Components
Mastheads Tangs Jib Boxes & Forestay Attachments Exit Blocks Spreaders Spreader Bases Spinnaker Cars Exit Plates Cleats	Mainsail Gates & Feeders Gooseneck Brackets Winch Pads Vang Brackets & Hardware Mast Steps Internal Waterproofing

Sparcraft FM-50 Mast Section Sparcraft FM-50 Mast Section is available in a variety of lengths fully anodized. Painted finishes and other lengths are available on special order. If you require a complete Mast Assembly, you can select from components below and contact us with specifications. If you require components not listed below please contact us with complete details.

FM-50 Mast – Mastheads

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