APS - Sheave Boxes and Halyard Exit Plates
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Harken Sheave Box and Reinforced Cover Plates

Harken Sheave Box and Reinforced Cover Plates

These lightweight, low-friction wire blocks carry wire and line halyards on boats like the Mumm 30 and Melges 30. High-load, composite bearings carry axial loads. The sheave is Hardkote-anodized and Teflon impregnated for strength and corrosion resistance. Has sideload balls between the sheave and the sideplate to minimize friction from unfair leads. The sideplates can be rotated before installation to allow the insertion of pre-swaged or Nico pressed wire fittings. The H310 comes with a standard non-reinforced coverplate. Reinforced coverplates are sold separately and do not include the block assembly.

Part # Description Sheave Dia. Weight Max Wire Dia. Max Line Dia. Shackle Pin Safe Working Load Breaking Strength Hole Spacing Cutout
in mm g oz in mm in mm in mm lb kg lb kg in mm in mm
H306 Thru-Deck 1 1/2 38 3.25 92 1/8 3 3/16 5 - - 1500 680 3000 1361 2 15/16 75 17/32 x 2 5/16 13 x 59
H310 Thru-Deck 2 51 5.75 163 3/16 5 1/4 6 - - 2000 907 4000 1814 3 11/16 94 9/16 x 2 23/32 14 x 73


H306 Wire Thru-deck 1.5 Price: $58.08 H310 Wire Thru-deck 2 Price: $86.33
HCP1200 Coverplate for the H310 Wire Block w/5/32 Support Rods Price: $38.20 HCP1201 Coverplate for the H310 Wire Block w/1/4 Crossbar Price: $62.58
HCP1687 Coverplate for H310 Wire Block w/1/4 Crossbar w/Open Ends Price: $52.39


Ronstan Sheave Boxes

Ronstan Sheave Boxes

Sheave boxes are ideal for applications where lines (rope or wire) need to be led through decks, bulkheads or spars minimising friction and chafing. Nylatron sheaves, grade 316 stainless box.

Part # Sheave Diameter Max Rope Max Wire A B C D MWL BL Weight
mm in mm in mm in mm in mm in mm in mm in kg lbs kg lbs g oz
RF452 22 7/8 3 1/8 3 1/8 25.5 1 26 1 7.5 5/16 5 3/16 160 350 320 700 30 1.1
RF31712 30 1 3/16 8 5/16 4 5/32 44 1 3/4 27 1 1/16 14 9/16 5 3/16 375 830 800 1760 45 1.6
RF41712 40 1 9/16 10 3/8 5 3/16 54 2 1/8 33 1 5/16 17 11/16 5 3/16 500 1100 1000 2200 75 2.6
RF51712 50 2 12 1/2 5 3/16 62 2 7/16 42 1 5/8 21 13/16 5 3/16 800 1760 1500 3300 145 5.1


RF31712 Line Sheave Box 1-1/2 Acetal Price: $25.46 RF41712 Line Sheave Box 1-3/4 Acetal Price: $28.86
RF452 Sheave Box Wire Rope 1/8 Price: $28.01 RF51712 50mm Sheave Box Price: $38.21


Holt Allen Sheave Boxes

Holt Allen Sheave Boxes

Holt Allen alloy sheave boxes are suitable for all types of spar. They can also be used in thru-deck or bulkhead applications. The pressure die cast aluminum casing incorporates special side flanges to minimize friction and rope wear. Available with either a plain bearing acetal sheave or a high-load stainless steel ball bearing sheave.  The HA8, HA8A, and HA28 yacht sheave boxes are ideal for halyard exit and entry boxes with special side flanges to minimize friction. The HA8 and HA8A have a nylon casing. 

Part # For Sheave Material Sheave Type Sheave
Width
Sheave
Diameter
Slot Size Box Depth
in (mm) in (mm) in mm in mm
HA4 Line Acetal Plain Bearing 5/16 inch (8mm) 1 inch (25mm) 1-11/16 x 21/32 43mm x 17mm 1-1/4 inch 32
HA5 Line Acetal Plain Bearing 1/4 inch (6mm) 1-3/8 inch (36mm) 1-31/32 x 9/16 50mm x 14mm 1-1/2 inch 38
HA6 Line Acetal Plain Bearing 5/16 inch (8mm) 1-1/2 inch (38mm) 2-1/16 x 19/32 52mm x 15mm 1-5/8 inch 41
HA6H Line Aluminum Plain Bearing 5/16 inch (8mm) 1-1/2 inch (38mm) 2-1/16 x 19/32 52mm x 15mm 1-5/8 inch 41
HA6B Wire Stainless Ball Bearing 5/16 inch (8mm) 1-1/2 inch (38mm) 2-1/16 x 19/32 52mm x 15mm 1-5/8 inch 41
HA7 Line Acetal Plain Bearing 5/16 inch (8mm) 1 inch (26mm) 1-21/32 x 1-1/2 42mm x 38mm 1-1/4 inch 32
HA8 Line Nylon Plain Bearing 1/2 inch (12mm) 1-1/2 inch (38mm) 2-23/32 x 15/16 69mm x 24mm 1-5/8 inch 41
HA8A Line Aluminum Plain Bearing 1/2 inch (12mm) 1-1/2 inch (38mm) 2-23/32 x 15/16 69mm x 24mm 1-5/8 inch 41
HA9 Line Acetal Plain Bearing 5/16 inch (8mm) 1 inch (25mm) 1-23/32 x 1/2 44mm x 13mm 1-1/4 inch 32
HA9H Line Aluminum Plain Bearing 5/16 inch (8mm) 1 inch (25mm) 1-23/32 x 1/2 44mm x13mm 1-1/4 inch 32
HA9B Wire Stainless Ball Bearing 5/16 inch (8mm) 1 inch (25mm) 1-23/32 x 1/2 44mm x 13mm 1-1/4 inch 32
HA28 Line Acetal Plain Bearing 1/2 inch (12mm) 1-1/2 inch (38mm) 2-5/32 x 29/32 55mm x 23mm 1-7/8 inch 48


HA28 Sheave Box 38mm Sheave Price: $42.97 HA4 Sheave Box-25mm Sheave Price: $14.45
HA5 Sheave Box 36mm Sheave Price: $14.45 HA6 Sheave Box 38mm Sheave Price: $15.50
HA6B Sheave Box 38mm SS Sheave Price: $56.93 HA6H Sheave Box 38mm Alum Sheave Price: $22.40
HA7 Double Sheave Box 26mm Sheaves Price: $21.58 HA8 Sheave Box 38mm Nylon Sheave Price: $12.21
HA8A Sheave Box 38mm Alum Sheave Price: $24.82 HA9 Sheave Box 25mm Sheave Price: $12.17
HA9B Sheave Box 25mm SS Sheave Price: $34.83 HA9H Sheave Box 25mm Alum Sheave Price: $20.54


Holt Allen Low Profile Sheave Boxes

Holt Allen Low Profile Sheave Boxes

Holt Allen low profile alloy sheave boxes feature the Holt Allen --hook-in-- cage which was developed to withstand the high loading of todays modern rigs. The pressure die cast aluminum casing incorporates special side flanges to minimize friction and rope wear. Available with either a plain bearing acetal sheave or a high-load stainless steel ball bearing sheave.
Part # For Sheave Material Sheave Type Sheave
Diameter
Sheave
Width
Slot Size Box Depth
in/mm in/mm in mm in mm
HA15 Line Acetal Plain Bearing 1/4 inch (6mm) 1 inch (25mm) 1-1/2 x 13/32 38mm x 10mm 1 inch 25
HA15B Wire Stainless Ball Bearing 1/4 inch (6mm) 1 inch (25mm) 1-1/2 x 13/32 38mm x 10mm 1 inch 25
HA16 Line Acetal Plain Bearing 1/4 inch (6mm) 1-1/2 inch (38mm) 2-1/8 x 1/2 54mm x 13mm 1-7/8 inch 48
HA16B Wire Stainless Ball Bearing 1/4 inch (6mm) 1-1/2 inch (38mm) 2-1/8 x 1/2 54mm x 13mm 1-7/8 inch 48


HA15 Sheave Box 25mm Low-Pro Price: $17.09 HA15B Sheave Box 25mm SS Low-Pro Price: $48.46
HA16 Sheave Box 38mm Low-Pro Price: $20.95 HA16B Sheave Box 38mm SS Low-Pro Price: $65.59


Selden Mast Sheave, Cleats & Exit Boxes

Selden Mast Sheave, Cleats & Exit Boxes

Part # Description Additional Information
SLD50506901 Halyard Exit Box Nylon Ball Bearing Sheave
SLD50506902 Halyard Exit Box Stainless Steel Ball Bearing Sheave
SLD50508401 Double Halyard Exit Box For Peened Open Track
SLD50507901 Spinnaker/Topping Lift Sheave Box Stainless Steel Ball Bearing Sheave
SLD50509202 Jib Box High-load stainless steel jib box with bronze sheave
SLD50507101 Jib Halyard Box Nylon Ball Bearing Sheave
SLD50507102 Jib Halyard Box Stainless Steel Ball Bearing Sheave
SLD505075 Jib Halyard Box Wear Guard Stainless Steel, Fits SLD505071
SLD50508501 Double Halyard Exit Box Includes flange for fixings
SLD504109 Stainless Steel Ball Bearing Sheave For Halyard Exit Box SLD50506901/02
SLD504361 Plain sheave For Jib Box SLD50507101/02
SLD504360 Plain sheave For Exit Box SLD50506901/02
SLD50872901 Spinnaker Halyard Crane Stainless Steel
SLD5110301D Composite Cleat 110 Composite
SLD51163001PH Tooth Rack ---


SLD165621 Clevis Pin for main Halyard Sheave Price: $3.00 SLD50506901 Halyard Sheave Box Plastic Ball Bearing Price: $26.00
SLD50506902 Halyard Sheave Box SS Ball Bearing Price: $50.00 SLD50507101 Jib Sheave Box - Nylon Ball Bearing Price: $36.00
SLD50507102 Jib Sheave Box - Aluminum Sheave Price: $48.00 SLD505075 SS Jib Box Wear Gaurds (Fits SLD505-071) Price: $7.00
SLD50507901 Sheave Box Stainless Ball Bearing Price: $32.00 SLD50508401 Double Exit Box (no flange) Price: $70.00
SLD50508501 Double Exit Box (w/flange) Price: $57.00



Super Spars Sheave Box

Super Spars Sheave Box The Super Spars Sheave Box has an alloy body and 1-7/16 inch diameter x 1/4 inch wide sheaves. It has a plain bearing Acetal sheave. Hole size is 2-3/16 x 1/2 inch.

SPS012 Sheave Box Jib Plain Bearing Price: $32.11



Race Lite Exit Plates

Race Lite Exit Plates

RaceLite exit plates are ideal for entrance or exit points of internal halyards and control lines on dinghies and small keelboats. Stamped from stainless steel and formed to provide a smooth halyard lead and a finished look to mast and boom slots. Maximum line diameter 5/16"



RL255C Halyard Exit Plate Curved Price: $6.35 RL255F Halyard Exit Plate Flat Price: $6.35



Schaefer Exit Plates

Schaefer Exit Plates Schaefer exit plates are ideal for entrance or exit points of internal halyards and control lines. Use these for big boats. Stamped from stainless steel and formed to provide a smooth halyard lead and a finished look to mast and boom slots. Welded rub bar on the inner surface prevents halyards from wearing a slot in the mast. The surface plate prevents halyards from damaging painted spars.

Part # Mast Slot Opening Type Max Line
in mm in mm
SC3446 2-1/4 x 13/16 57 x 21 Flat 1/2 13
SC3449 3-1/4 x 1 83 x 25 Curved 3/4 19


SC3446 Halyard Exit Plate Flat Price: $16.60 SC3449 Halyard Exit Plate Curved Price: $39.08



Forespar Nylon Exit Box

Forespar Nylon Exit Box Made of Nylon, this exit box has stainless steel bars. We found these exit boxes on big boat carbon spinnaker poles. They are perfect for dinghy masts. Dimensions are 3" x 7/8" overall and will fit in to a 2" x 5/8" hole. This is a suitable replacement for the discontinued Z-spar aluminum exit box (ZSHE).

FP030016 Exit Box Price: $12.76

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