Halyard Lead Blocks

Fixed Halyard Lead Blocks - 4 Screw Fixed Halyard Lead Blocks are usually mounted to the Deck, for turning a Halyard or Reef line at the base of the Mast. Those listed here are attached with 4 Screws.
SS Lead Block w/ 1 1/16" Delrin Sheave: Sch 02-50: Schaefer 02 Halyard Lead Block has 1 1/16" Delrin Sheave for use with up to 5/16" line. Unit is (maximum) 1 5/8" tall, Base is 1 1/2" long x 1 1/2" wide, and attaches to deck with (4) 3/16" (#10) RH screws on 1" x 1 3/16" centers.

*Black Lead Block w/ 1 7/16" Delrin Sheave: Sch 303-50:* *SS Lead Block w/ 1 7/16" Delrin Sheave: Sch 03-50:* *SS Lead Block w/ 1 7/16" Delrin Sheaves - Double: Sch 03-51:*
Schaefer 03 Halyard Lead Block has 1 7/16" Delrin Sheave(s) for use with up to 7/16" line. Unit is (maximum) 2" tall, Base is 1 3/4" long x 1 11/16" wide, and attaches to deck with (4) 3/16" (#10) RH screws on 1 1/4" x 1 5/16" centers.

*Lead Block w/ 2" Delrin Sheave: Sch 504-60:* *Lead Block w/ 2" Delrin Sheaves - Double: Sch 504-61X:* Schaefer 05 Halyard Lead Block has 2" Delrin Sheave(s) for use with up to 7/16" line. Unit has Black Aluminum Cheeks, is (maximum) 2 5/8" tall, Base is 2 3/16" long x 2" wide (Double is 2 3/4" wide), and attaches to deck with (4) 3/16" (#10) RH screws on 1 7/16" x 1 1/2" (Double 2 3/4") centers.
Lead Block w/ 2" Delrin Sheave - Single: NF 1271: Lead Block w/ 2" Delrin Sheaves - Double: NF 1272: Nicro-Fico Halyard Lead Block with 2" Delrin Sheaves for use with up to 1/2" line. Units have Black plastic Cheeks, are (maximum) 2 1/2" tall with Base that is 2 3/8" long and attaches to deck with (4) 3/16" (#10) RH screws. Single is (maximum) 2 1/8" wide, with fasteners on 1 5/8" x 1 11/16" centers. Marked FG1271. Double is (maximum) 2 3/4" wide, with fasteners on 2 3/8" x 1 11/16" centers. Marked FG1272.
Lead Block w/ 2" Delrin Sheaves - Old-style Double: NF 1272X:
Old-style Double Nicro-Fico Halyard Lead Block with 2" Delrin Sheaves for use with up to 1/2" line. Unit has Black Aluminum Cheeks, is (maximum) 2 1/2" tall with Base that is 2 3/8" long x 2 3/4" wide and attaches to deck with (4) 3/16" (#10) RH screws 2 3/16" x 1 3/8" centers.
Swiveling Lead Block w/ 2" Delrin Sheave: NF 1273: Nicro-Fico Swiveling Halyard Lead Block with 2" Delrin Sheaves for use with up to 1/2" line. Unit has Black plastic Cheeks, is (maximum) 2 7/8" tall, Base is 2 3/16" diameter and attaches to deck with (4) 3/16" (#10) RH screws on 1 7/16" circle centers.

*Lead Block w/ 2 3/8" Delrin Sheave: Sch 704-60:* *Lead Block w/ 2 3/8" Aluminum Sheave: Sch 704-61:* Schaefer 07 Halyard Lead Block has 2 3/8" Sheave for use with up to 5/8" line. Unit has Black Aluminum Cheeks, is (maximum) 3 1/4" tall, Base is 2 7/8" long x 2 7/16" wide, and attaches to deck with (4) 1/4" RH screws on 2 1/16" x 1 13/16" centers.

Fixed Halyard Lead Blocks - 2 Screw Fixed Halyard Lead Blocks are usually mounted to the Deck, for turning a Halyard or Reef line at the base of the Mast. Those listed here are attached with 2 Screws.
Fixed Lead Block w/ 1 1/16" Delrin Sheave: Sch 200-31: Schaefer 02-Series Fixed Halyard Lead Block with 1 1/16" Ball-Bearing Sheave for use with up to 5/16" line. Unit is (maximum) 1 1/2" tall, Base is 1 5/8" long x 3/4" wide, and attaches to deck with (2) 3/16" (#10) screws on 1 1/4" centers. SWL is 500 lbs. (225Kg).
Fixed Lead Block w/ 1 7/16" Delrin Sheave: Sch 300-31: Schaefer 03-Series Fixed Halyard Lead Block with 1 7/16" Ball-Bearing Sheave for use with up to 7/16" line. Unit is (maximum) 2" tall, Base is 2 1/8" long x 3/4" wide, and attaches to deck with (2) 3/16" (#10) screws on 1 3/4" centers. SWL is 1000 lbs. (454Kg).
Fixed Lead Block w/ 2" Delrin Sheave: Sch 506-31: Schaefer 05-Series Fixed Halyard Lead Block with 2" Ball-Bearing Sheave for use with up to 7/16" line. Unit is (maximum) 2 5/8" tall, Base is 3" long x 13/16" wide, and attaches to deck with (2) 1/4" RH screws on 2 1/4" centers. SWL is 1000 lbs. (454Kg).

Fixed Lead Block w/ 2 3/8" Delrin Sheave: Sch 32-06: Schaefer 08 'Half-moon' Fixed Halyard Lead Block with 2 3/8" Delrin Sheave for use with up to 5/8" line. Unit is (maximum) 3 3/16" tall, Base is 3 5/16" long x 1 5/8" wide, and attaches to deck with (2) 1/4" RH screws on 3" centers. SWL is 3000 lbs. (1361Kg).
Fixed Lead Block w/ 2 3/8" Alu. Sheave: Sch 32-06A: Fixed Lead Block w/ 2 3/8" Alu. BB Sheave: Sch 32-06UC: Schaefer 08 'Half-moon' Fixed Halyard Lead Block with 2 3/8" Aluminum Sheave for use with up to 5/8" line. Unit is (maximum) 3 3/16" tall, Base is 3 5/16" long x 1 5/8" wide, and attaches to deck with (2) 1/4" RH screws on 3" centers. Aluminum UC Circuit Sheave has Torlon Ball Bearings for minimum friction. SWL is 3000 lbs. (1361Kg).
Fixed Lead Block w/ 3 1/4" Delrin Sheave: Sch 32-09X: Fixed Lead Block w/ 3 1/4" Alu. Sheave: Sch 32-08X: Schaefer 10-Series 'Half-moon' Fixed Halyard Lead Block with 3 1/4" Sheave for use with up to 3/4" line. Unit is (maximum) 4 3/16" tall, Base is 5" long x 1" wide, and attaches to deck with (2) 5/16" screws (1 RH & 1 FH) on 4" centers.

Hinged Halyard Lead Blocks Hinged Halyard Lead Blocks can be mounted to the Deck but are commonly used on the Mast, the Hinge allows the Block to align with off-center loads. Narrow Base varieties are especially useful when attachment to the Mast is required as several can be mounted in a small space. Note: When attached to the Mast, we recommend putting Nuts inside the Mast.
Hinged Block w/ 1 7/16" Delrin BB Sheave: Sch 300-32: Schaefer 03-Series Narrow Base Hinged Halyard Lead Block with 1 7/16" Ball-Bearing Sheave for use with up to 7/16" line. Unit is (maximum) 2 1/2" tall, Base is 2 1/2" long x 3/4" wide, and is attached with (2) 3/16" (#10) FH screws on 1 3/4" centers. Narrow Base with Hinge allows for Mast attachment on any Spar Section. SWL is 1000 lbs. (454Kg).
Hinged Lead Block w/ 2" Delrin BB Sheave: Sch 506-32: Schaefer 05-Series Narrow Base Hinged Halyard Lead Block with 2" Ball-Bearing Sheave for use with up to 1/2" line. Unit is (maximum) 3 1/8" tall, Base is 3 1/4" long x 7/8" wide, and is attached with (2) 1/4" FH screws on 1 3/4" centers. Narrow Base with Hinge allows for Mast attachment on any Spar Section. SWL is 1000 lbs. (454Kg).

Hinged Halyard Turning Block w/ 2" Alu. Sheave: K-10865: Kenyon Mast mounted Halyard Turning Block is attached to Mast at Deck level to allow halyards to be led aft at any angle. Swiveling Halyard Turning Block adjusts to any angle and features 2" Aluminum V-groove Sheave K-10861-B5, for wire or rope Halyards up to 7/16" diameter. Investment Cast Almag Block attaches to mast with (4) 1/4" FH screws or rivets. Base is 4 1/16" high x 1 7/8" wide. As used on J/29, J/30, J/35, J/36 and others. Limited Availabilty.
	Sheave, 2" for K-10865 Turning Block: K-10861-B5: Replacement Sheave for K-10865 Halyard Turning Block Assembly. Anodized Aluminum Sheave w/ integral Bronze bushing is 2" OD x 17/32" (.535") wide x 5/16" ID.
	5/16" Sheave Axle Pin w/ Snap Ring: K-11041: Sheave Axle Pin for K-10865 Halyard Turning Block Assembly. Headed SS Pin is 5/16" diameter with groove for Snap Ring, grip length is 1.03".
	*SS Snap Rings for 5/16" Axle Pin: K-63017-2P:* Used on Sheave Axle in Mast mounted Halyard Turning Block K-10865. Sold in 2-pack, they require small snap ring pliers for attachment.
Hinged Lead Block w/ 2" Aluminum Sheave: Sch 32-16X: Schaefer 05-Series Narrow Base Hinged Halyard Lead Block with 2" Aluminum Sheave for use with up to 1/2" line or up to 3/16" wire. Unit is (maximum) 3 5/8" tall, Narrow Base is 2 3/4" long x 3/4" wide, and attaches to mounting surface with (3) #12 (7/32") FH screws on 27/64" (<7/8") centers. Narrow Base with Hinge allows for Mast attachment on any Spar Section. SWL is 1750 lbs. (795Kg).
Hinged Lead Block w/ 2" Alu. Sheave w/ Long Base: Sch 32-16HD:
Schaefer 05-Series Narrow Base Hinged Halyard Lead Block with 2" Aluminum Sheave for use with up to 7/16" line. Unit is (maximum) 3 3/8" tall, Extra Long Narrow Base is 3 1/2" long x 3/4" wide, and attaches to mounting surface with (4) #12 (7/32") FH screws on 3/4" centers, extra hole is 1" further. Long Narrow Base with Hinge allows for Mast attachment on any Spar Section. Similar to Sch 32-16X, above, but with an Extra Long Heavy-duty welded Base that allows a 4th screw below the block for higher load applications. Specially developed for use on J/35 Mast.
Hinged Lead Block w/ 2 3/8" Aluminum Sheave: Sch 32-17: Hinged Lead Block w/ 2 3/8" Alu. Sheave w/ Long Base: Sch 32-17HD:
Schaefer 08-Series Narrow Base 'Half-moon' Hinged Halyard Lead Block with 2 3/8" Aluminum Sheave for use with up to 1/2" line. Unit is (maximum) 3 3/16" tall, Base is 4 9/16" long x 3/4" wide, and is attached to mounting surface with (4) 1/4" FH screws on 1 1/8" centers. SWL is 3000 lbs. (1361Kg). *Sch 32-17HD* is identical, but with an Extra Long Heavy-duty welded Base (5 9/16" long) that allows for a 5th screw below the block for higher load applications when mounted on the Mast.

Hinged Lead Block w/ 2 3/8" Alu. Sheave: Sch 32-15X: Schaefer 08-Series 'Half-moon' Hinged Halyard Lead Block with 2 3/8" Aluminum Sheave for use with up to 5/8" line. Spring-loaded Block is mostly used on Deck, Springs keeps Sheave upright when not under load. Unit is (maximum) 3 3/16" tall, Base is 3 5/16" long x 1 5/8" wide, and attaches to deck with (2) 1/4" RH screws on 3" x 1 5/16" centers. SWL is 3000 lbs. (1361Kg). Replacement Stand-up Springs are available (2 per Block), Sold each: Sch 32-03SP:
Hinged Lead Block w/ 2 3/8" Alu. Ball Bearing Sheave: Sch 32-15UC:
Schaefer 08-Series 'Half-moon' Hinged Halyard Lead Block with 2 3/8" Aluminum UC Ball-Bearing Sheave for use with up to 5/8" line. Spring-loaded Block is mostly used on Deck, Springs keeps Sheave upright when not under load. Unit is (maximum) 3 3/16" tall, Base is 3 5/16" long x 1 5/8" wide, and attaches to deck with (2) 1/4" RH screws on 3" x 1 5/16" centers. Aluminum UC Circuit Sheave has Torlon Ball Bearings for minimum friction. SWL is 3000 lbs. (1361Kg). Replacement Stand-up Springs are available (2 per Block), Sold each: Sch 32-03SP:

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Spars, Rigging, and Hardware for Sailboats

Halyard Lead Blocks Halyard Lead Blocks are designed to turn a line 90°, and commonly used for turning a Halyard or Reef line at the base of the Mast to lead it along the Deck. Fixed variety's are usually attached to the Deck. Hinged varieties are mostly used for attachment to the Mast. See also: Stand Up Spring Blocks, and other Blocks. See also: Isomat/ Sparcraft, and Z-Spar Mast Base Turning Blocks. Rig-Rite stocks a large selection of Halyard Lead Blocks from a variety of manufacturers, most are listed here. For Halyard Lead Blocks not listed, please contact us with complete information, including Manufacturer's part number or a sketch or photo of the item(s) with dimensions.