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Harken Line/Wire High Strength

Harken Line/Wire High Strength

These lightweight, low-friction wire blocks carry wire halyards and high-strength control lines on boats of all sizes. High-load, composite bearings carry axial loads. The sheave is Hardkote-anodized and Teflon impregnated for strength and corrosion resistance. 1.00" wire blocks use low-friction thrust washers while 1.50" and 2.00" wire blocks have sideload balls between the sheave and the sideplate to minimize friction from unfair leads.

The sideplates of the H302, H306 and H310 Thru-Decks can be rotated before installation to allow the insertion of pre-swaged or crimp swage wire fittings.

The Cheeks include fasteners: #10 (5 mm) RH for the H301, 1/4" (6 mm) RH for the H302 and 5/16" (8 mm ) RH for the H309. The Thru-Decks do not included fasteners. The H302 and H306 require 2x #10 (5 mm) RH and the H310 requires 2x 1/4" (6 mm) RH fasteners.

The H321 Split Backstay Plate works with the H308 and comes with two 1/4" (6 mm) pins and the H321 comes with two 5/16" (8 mm) pins. Each comes with cotter pins and o-rings.

This range is great for wire halyards, vangs and other control lines with high loads where the line doesn't travel a lot.

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
H300 Single 1 25 1 28 3/32 2 5/32 4 3/16 5 1000 454 2000 907 - - - -
H312 Single, Becket 1 25 1.25 35 3/32 2 5/32 4 3/16 5 1000 454 2000 907 - - - -
H301 Cheek 1 25 1.25 35 3/32 2 5/32 4 - - 1000 454 2000 907 7/8 22 - -
H302 Thru-Deck 1 25 1 28 3/32 2 5/32 4 - - 1000 454 2000 907 2 1/8 54 13/32 x 1 17/32 11 x 39
H304 Single 1 1/2 38 2.75 78 1/8 3 3/16 5 1/4 6 1500 680 3000 1361 - - - -
H313 Single, Becket 1 1/2 38 3 85 1/8 3 3/16 5 1/4 6 1500 680 3000 1361 - - - -
H320 Single, Ferrule Head 1 1/2 38 3 85 1/8 3 3/16 5 1/4 6 1500 680 3000 1361 - - - -
H305 Cheek 1 1/2 38 3.25 92 1/8 3 3/16 5 - - 1500 680 3000 1361 1 1/4 32 - -
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
H308 Single 2 51 5.25 149 3/16 5 1/4 6 5/16 8 2000 907 4000 1814 - - - -
H314 Single 2 51 5.75 163 3/16 5 1/4 6 5/16 8 2000 907 4000 1814 - - - -
H309 Cheek 2 51 6 170 3/16 5 1/4 6 - - 2000 907 4000 1814 1 5/8 41 - -
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


H300 Wire Single 1 Price: $32.38 H301 Wire Cheek 1 Price: $34.10
H302 Wire Thru-deck 1 Price: $41.01 H304 Wire Single 1.5 Price: $53.24
H305 Wire Cheek 1.5 Price: $54.34 H306 Wire Thru-deck 1.5 Price: $58.08
H308 Wire Single 2 Price: $77.70 H309 Wire Cheek 2 Price: $77.70
H310 Wire Thru-deck 2 Price: $86.33 H312 Wire Single w/Bec 1 Price: $37.58
H313 Wire Single w/Bec 1.5 Price: $56.98 H314 Wire Single w/Bec 2 Price: $84.83
H320 Wire Ferrule Head Single 1.5 Price: $60.28 H321 Split Backstay Plate SM Price: $23.06
H322 Split Backstay Plate LG Price: $26.31


Harken Wire Bullet Blocks

Harken Wire Bullet Blocks

These are Bullet Blocks upgraded for use with wire with roller bearings, which carry higher loads than ball bearings and Teflon-impregnated, Hardkote-anodized aluminum sheaves. Wire sheaves are dark grey compared to non-Wire Bullet Blocks' black sheaves, which can help you tell them apart.  Sheaves are 1-1/8 inch (29mm) and support a max wire size of 5/16" (8mm). Use these blocks for halyards and other small boat wire controls or for more highly loaded high-tech lines.

Part No. Description Sheave Dia. Length Weight Max Line Shackle Dia. SWL Break Strength
in mm in mm oz g in mm in mm lbs kg lbs kg
H098 Wire Single 1-1/8 29 2 51 1 28 5/16 8 - - 500 227 2000 907
H099 Wire Single/becket 1-1/8 29 2-3/4 70 1.25 35 5/16 8 - - 500 227 2000 907
H100 Wire Double 1-1/8 29 2-3/4 70 2.75 78 5/16 8 3/16 5 750 340 2000 907
H106 Wire Thru-deck* 1-1/8 29 3 76 1.25 35 5/16 8 - - 500 227 2000 907
H108 Wire Upright** 1-1/8 29 1.1/2 38 1.5 43 5/16 8 - - 500 227 2000 907
H109 Wire Cheek** 1-1/8 29 2-7/8 73 1.25 35 5/16 8 - - 500 227 2000 907
H183 Wire Single/swivel 1-1/8 29 2-3/4 70 1.5 43 5/16 8 3/16 5 500 227 2000 907
H288 Wire Thru-deck (SS)** 1-1/8 29 3 76 1.5 43 5/16 8 - - 400 181 2000 907
H290 Wire In-line exit (SS)** 1-1/8 29 3-3/4 95 2.25 64 5/16 8 - - 400 181 2000 907

*#10 (5mm) FH Fasteners **#8 (4mm) RH Fasteners



H098 Wire Bullet Single Price: $18.66 H099 Wire Bullet Single w/Bec Price: $22.00
H100 Wire Bullet Double Price: $48.05 H106 Wire Bullet Thru-deck Price: $25.74
H108 Wire Bullet Upright Price: $26.00 H109 Wire Bullet Cheek Price: $22.44
H183 Wire Bullet Single w/Swivel Price: $29.00 H288 Wire Bullet Thru-deck Price: $35.77


Allen Brothers 16mm High Tension Micro Block

Allen Brothers 16mm High Tension Micro Block

Allen Brothers 16mm High Tension range is made from 316 stainless throughout, giving incredible strength to weight ratios. The ball race is milled using the latest CNC technology. This precision machining ensures absolute consistency in production which in turn ensures maximum sheave efficiency and minimum friction for all high load applications.

Part No. Description Sheave Dia Length Wire Dia. Shackle Pin Dia. Breaking Load Weight
mm in mm in mm in mm in kg lb g oz
HA4568 Single 16 5/8 29 1-5/32 2-4 1/16 - 3/16 4 3/16 400 882 11 .39
HA4569 Double 16 5/8 40 1-9/16 2-4 1/16 - 3/16 4 3/16 400 882 25 .88
HA4669 Double/becket 16 5/8 50 1-31/32 2-4 1/16 - 3/16 4 3/16 400 882 26 .92
HA4570 Triple 16 5/8 40 1-9/16 2-4 1/16 - 3/16 4 3/16 400 882 36 1.27
HA4670 Triple/becket 16 5/8 50 1-31/32 2-4 1/16 - 3/16 4 3/16 400 882 38 1.34


HA4568 16mm High Tension Micro Single Price: $26.54 HA4569 16mm High Tension Micro Double Price: $56.71
HA4570 16mm High Tension Micro Triple Price: $90.08 HA4669 16mm High Tension Micro Double, Becket Price: $63.50
HA4670 16mm High Tension Micro Triple, Becket Price: $93.53


Allen Brothers 25mm High Tension Blocks

Allen Brothers 25mm High Tension Blocks

Allen Brothers 25mm High Tension range is made from 316 stainless throughout, giving incredible strength to weight ratios. The ball race is milled using the latest CNC technology. This precision machining ensures absolute consistency in production which in turn ensures maximum sheave efficiency and minimum friction for all high load applications.

Part No. Description Sheave Dia Length Wire Dia. Shackle Pin Dia. Breaking Load Weight
mm in mm in mm in mm in kg lb g oz
HA4279 Single Cheek 25 1 41 1-5/8 2 - 7 1/16 - 9/32 5 3/16 750 1654 44 1.55
HA4379 Single Fixed Head 25 1 41 1-5/8 2 - 5 1/16 - 3/16 5 3/16 750 1654 25 .88
HA4393 Single with Becket 25 1 59 2-5/16 2 - 5 1/16 - 3/16 5 3/16 750 1654 31 1.09
HA4479 Single with Shackle 25 1 41 1-5/8 2 - 5 1/16 - 3/16 5 3/16 750 1654 33 1.16
HA4993 Single with Clevis Pin Head 25 1 41 1-5/8 2 - 5 1/16 - 3/16 5 3/16 750 1654 31 1.09
HA4679 Double 25 1 51 2 2 - 5 1/16 - 3/16 5 3/16 750 1654 54 1.90
HA4593 Triple 25 1 51 2 2 - 5 1/16 - 3/16 5 3/16 750 1654 78 2.75
HA4693 Triple Becket 25 1 68 2-11/16 2 - 5 1/16 - 3/16 5 3/16 750 1654 84 2.96


HA4279 25mm Single w/Shackle High Tension Block Price: $40.70 HA4379 25mm Single High Tension Block Price: $27.74
HA4393 25mm High Tension Single w/Becket Price: $37.54 HA4479 25mm Single w/Shackle High Tension Block Price: $39.87
HA4593 25mm High Tension Triple Price: $102.62 HA4679 25mm Double High Tension Block Price: $72.52
HA4693 25mm Triple High Tension Block w/Becket Price: $106.29 HA4779 25mm High Tension Double, Becket Price: $76.00
HA4993 25mm Single w/Clevis Pin High Tension Block Price: $38.57


Holt Allen 38mm High Tension Macro Blocks

Holt Allen 38mm High Tension Macro Blocks

Holt Allen's 38mm High Tension range is made from 316 stainless throughout, giving incredible strength to weight ratios. The ball race is milled using the latest CNC technology. This precision machining ensures absolute consistency in production which in turn ensures maximum sheave efficiency and minimum friction for all high load applications.

Part No. Description Sheave Dia Length Wire Dia. Shackle Pin Dia. Breaking Load Weight
mm in mm in mm in mm in kg lb g oz
HA4196 Single 38 1-1/2 60 2-3/8 80 3-5/32 5 3/16 1000 2205 62 2.19
HA4296 Single/shackle 38 1-1/2 60 2-3/8 77 3-1/32 5 3/16 1000 2205 60 2.12
HA4396 Single/becket 38 1-1/2 78 3-1/16 77 3-1/32 5 3/16 1000 2205 77 2.72
HA4496 Double 38 1-1/2 74 2-29/32 134 5-7/32 5 3/16 1000 2205 68 2.40
HA4596 Double/becket 38 1-1/2 74 2-29/32 134 5-7/32 5 3/16 1000 2205 68 2.40



HA4196 38mm Single Macro High Tension Block Price: $58.39 HA4296 38mm Single w/Shackle Macro High Tension Block Price: $67.44
HA4396 38mm High Tension Macro Single, Becket Price: $68.16 HA4496 38mm High Tension Macro Double Price: $128.97
HA4596 38mm High Tension Macro Double, Becket Price: $134.19


RWO Series 19 Nova Blocks

RWO Series 19 Nova Blocks

The RWO Series 19 Micro Blocks offer a compact comprehensive range of plain bearing blocks for small lines. These economical blocks are very popular in our store, especially the thru-deck versions. Ideal for control lines (max line size 1/4 inch) where space is at a premium and for lines that do not require low friction, ball-bearing blocks. Stainless steel straps and a plain bearing 19mm (3/4 inch) sheave result in a high breaking load of 1250 lbs and Max working load of 625 lbs.

Part No. Description Max Line Working Load Breaking Load Weight Fittings
mm in lbs kg lbs kg g oz
R7101 Single 6 1/4 625 283.5 1,250 567 11 .38
R7102 Single/Becket 6 1/4 625 283.5 1,250 567 14 .49
R7103 Single/Swivel 6 1/4 625 283.5 1,250 567 13 .45
R7104 Single/Swivel/Becket 6 1/4 625 283.5 1,250 567 16 .56
R7105 Thru-Deck 6 1/4 625 283.5 1,250 567 14 .49 M4 Fixings
R7106 Cheek 6 1/4 625 283.5 1,250 567 13 .45 M4 Fixings
R7113 Swivel hook 6 1/4 625 283.5 1,250 567 19 .67
R7126 Upright 6 1/4 625 283.5 1,250 567 25 .88 M4 Fixings
R7117 Back to Back 6 1/4 625 283.5 1,250 567 19 .67
R7129 Fixed Fork 6 1/4 625 283.5 1,250 567 12 .42
R7108 Double Thru-Deck 6 1/4 625 283.5 1,250 567 22 .77 M4 Fixings
R7111 Double 6 1/4 625 283.5 1,250 567 35 1.23
R7112 Double/Becket 6 1/4 625 283.5 1,250 567 38 1.34
R7114 Triple 6 1/4 625 283.5 1,250 567 50 1.76
R7115 Triple/Becket 6 1/4 625 283.5 1,250 567 53 1.86


R7101 19mm Nova Single Price: $9.38 R7102 19mm Nova Single w/Bec Price: $11.30
R7103 19mm Nova Single w/Swivel Price: $14.89 R7104 19mm Nova Single Swivel/Bec. Price: $13.79
R7105 19mm Nova Sgl Thru Deck Price: $16.26 R7106 19mm Nova Cheek Price: $10.48
R7108 19mm Nova Dbl Thru Deck Price: $24.26 R7111 19mm Nova Double Price: $22.88
R7112 19mm Nova Double w/Bec Price: $25.36 R7113 19mm Nova Single Swvl Hook Price: $15.16
R7114 19mm Nova Triple Price: $40.25 R7115 19mm Nova Triple w/Bec Price: $42.45
R7126 Single Upright Price: $38.59 R7129 19mm Nova Single Fixed Fork Price: $13.79



Holt Allen Micro Swivel Lead

Holt Allen Micro Swivel Lead From the Holt Allen 20mm Micro Block range. Holt Allen calls this Micro a --Flip-Flop-- block. The sheave swivels approximately 80 degrees from side-to-side. Incorporates the Holt Dynamic Bearing making the block incredibly weight-efficient with excellent durability under load. Acetal resin ball-bearing sheave is 20mm (3/4 inch)and works best with a 3/16 inch line (max line size 1/4inch). Great for use with small high-tech lines like Spectron 12, Vectran 12, Tech 12, or PBO. Breaking load is rated at 770 lbs with a Max dynamic load of 230 lbs.

Part # Description MWL BL Max Line
kg lbs kg lbs mm in
HA4968 Flip Flop Block 100 230 350 770 6 1/4


HA4968 20mm Flip-Flop Block Price: $45.17


Sea-Sure 25mm Metal Sheaves for Wire

Sea-Sure 25mm Metal Sheaves for Wire

These Sea-Sure blocks have been designed to withstand high loads imposed when using wire or the latest small diameter high-tech lines; Stainless steel side plates with 25mm (1 inch) diameter chromium plated brass sheaves. Supports a max wire size of 5/32 inch or line up to 3/16 inch. Breaking stengths are 1000 lbs or greater.

Part No. Description Max Wire Breaking Load Weight
in mm kg lb g oz
SS0101 Single block with shackle 5/32 4 2094 950 40 1.41
SS0102 Single block with clevis pin 5/32 4 2094 950 35 1.23
SS0103 Single block with becket 5/32 4 2094 950 42 1.48
SS0104 Single block with hollow rivet 5/32 4 2094 950 33 1.16
SS0106 Spar mounted block (Curved lugs) 5/32 4 2094 950 30 1.05
SS0108 Spar mounted block (Flag lugs) 5/32 4 2094 950 30 1.05
SS0109 Wire guide block (Aluminium sheave) 5/32 4 2094 950 22 .77
SS0110 In line fixing mast sheave (Small side plates) 5/32 4 2094 950 33 1.16
SS0112 In line fixing mast sheave 5/32 4 2094 950 41 1.44
SS0114 Deck lead block 5/32 4 2094 950 40 1.41
SS0116 General purpose block 5/32 4 2094 950 30 1.05
SS0118 Single bolt down block 5/32 4 2094 950 37 1.30


SS0101 25mm Wire Single w/Shackle Price: $26.29 SS0102 25mm Wire Single w/Clevis Pin Price: $14.40
SS0103 25mm Wire Single w/Bec Price: $21.36 SS0104 25mm Wire Single Hollow Rivet Price: $19.84
SS0106 25mm Wire Sheave Exit (Curved) Price: $18.08 SS0108 25mm Wire Sheave Exit (Strght) Price: $47.08
SS0109 25mm Wire Mast Sheave (Alumin) Price: $22.60 SS0110 25mm Wire Mast Sheave Price: $47.08
SS0112 25mm Wire Mast Sheave (HD) Price: $20.20 SS0114 25mm Wire Single Thru-deck Price: $21.27
SS0116 25mm Wire General Purpose Price: $47.01 SS0118 25mm Wire Cheek Upright Price: $17.72


Racelite Economy Blocks

Racelite Economy Blocks

Great prices on good utility blocks. Stainless steel construction with 7/8 inch nylon plain bearing sheaves. Max 5/16 inch line diameter.

Part No. Description Weight Strength Max Line Sheave Dia
oz g lb kg in mm in mm
RL201 Single 0.5 15 600 272 5/16 8 7/8 22
RL201AR Single w/ring 0.5 15 600 272 5/16 8 7/8 22
RL203 Single/shackle 0.5 15 600 272 5/16 8 7/8 22
RL205 Single/swivel/shackle 0.5 15 600 272 5/16 8 7/8 22
RL206 Traveler w/ 2 swivel sngls 0.5 15 600 272 5/16 8 7/8 22
RL207 Traveler w/ 2 looptop sngls 0.5 15 600 272 5/16 8 7/8 22
RL221 Single/swivel loop 0.5 15 600 272 5/16 8 7/8 22


RL201 Single Block Price: $4.22 RL201AR Single Block w/Ring Price: $5.97
RL203 Single w/Shackle Price: $6.86 RL205 Single w/Swivel Shackle Price: $6.86
RL206 Traveler w/2 Swivel Singles Price: $9.07 RL207 Traveler w/2 Loop Top Sgls Price: $8.29
RL221 Single w/Swivel Loop Price: $6.56



Harken Wire 3.00 Inch Blocks

Harken Wire 3.00 Inch Blocks

These are 3.00 Inch Blocks upgraded for use with wire. Harken Wire 3.00 Inch Blocks feature Teflon-impregnated sheaves.  Their large diameters prevent wire breakdown. Sheaves are 3.00 inch (76mm) and support a max wire size of 7/16 inch (12mm). There are two versions of the Wire 3.00 Inch Block - a basic single, and a high-load single. The high-load block uses Torlon bearings to achieve its higher working load.  Use these blocks for wire halyards.

Part No. Breaking Strength Safe Working Load Shackle Pin Dia
lb kg lb kg in mm
H202 3000 1360 850 385 1/4 6


H202 Wire 3.00 Single Price: $97.57


Ronstan Kite Block

Ronstan Kite Block

This block has been developed for the hot new sport of kite boarding. It offers outstanding performance and incredible value. Ronstan has packed some remarkable features into this tiny package. The applications are nearly limitless, Whenever a tough, durable block for small diameter cordage is required, with no extra weight and plenty of strength, this colorful new block will be the obvious choice. •660 lbs. Breaking Load! •Weighs only 5 grams! (0.176 Ounces) •Takes up to 5/32” (4mm) line •Corrosion free The smooth profile won’t allow this block to catch on spinnaker cloth and it's kind to gelcoat or varnished finishes. The eye at the head of the KiteBlock has been designed specifically to suit up to 9/16” (15mm) webbing, and for use with almost any shackle. The RF13101 KiteBlock is available in a choice of four standard cheek/sheave colour Combinations. Gray/White, Black/White or Red/White.

Part No. Description Sheave Dia Max Line Dia Safe Working Load Breaking Strength Weight
in mm in mm lb kg lb kg oz g
RF13101NC Kite Block, Black 5/8 16 5/32 4 330 150 660 300 0.2 6
RF13101BGNC Kite Block, Grey 5/8 16 5/32 4 330 150 660 300 0.2 6
RF13101RNC Kite Block, Red 5/8 16 5/32 4 330 150 660 300 0.2 6


RF13101BGNC KiteBlock - Gray Price: $5.50 RF13101NC KiteBlock - Black Price: $5.50
RF13101RNC KiteBlock - Red Price: $5.50

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