Annapolis Performance Sailing (APS) - Ronstan Core Blocks
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Ronstan 45mm Core Blocks

Ronstan 45mm Core Blocks

Core blocks are designed to be affordable and friction reduced to nearly half compared to traditional alternatives. It focuses on an exclusive two stage bearing system housed in durable alloy cheeks. The first stage is an ultra low friction system for moderate loads. Stage two is designed for higher loads that engages for superior high stress performance. High quality materials make up the Core blocks. Sheave are made of U.V. stabilized Acetal or anodized aluminum (AW models). Cheek plates are aluminum alloy. Ball bearings are high compression strength carbon black Acetal. Shackle, post and hub are grade 316 stainless steel and the padeye of grade 15.5PH stainless steel.

Part # Description Sheave Diameter Max Rope Pin Diameter M.W.L Breaking Load Weight
in mm in mm in mm lbs kg lbs kg oz g

RF44100

Single Block, Swivel Shackle Head

1-3/4

45

1/2

12

3/16

5

1540

700

3090

1400

3.6

104

RF44140

Single Stand-Up Block, Swiveling

1-3/4

45

1/2

12

3/16

5

1540

700

3090

1400

5.3

151

RF44188

Single Halyard Block w/ Swivel Head

1-3/4

45

1/2

12

3/16

5

1540

700

3090

1400

4.2

121


* Full block rate load can only be achieved with uniformly distributed load across full length of clevis pin.

RF44100 45mm Core Single Block Price: $49.94 RF44140 45mm Core Single Stand-Up Block Price: $84.15
RF44188 45mm Core Single w/ Swivel Head Price: $67.15


Ronstan 60mm Core Blocks

Ronstan 60mm Core Blocks

Core blocks are designed to be affordable and friction reduced to nearly half compared to traditional alternatives. It focuses on an exclusive two stage bearing system housed in durable alloy cheeks. The first stage is an ultra low friction system for moderate loads. Stage two is designed for higher loads that engages for superior high stress performance.

High quality materials make up the Core blocks. Sheave are made of U.V. stabilized Acetal or anodized aluminum (AW models). Cheek plates are aluminum alloy. Ball bearings are high compression strength carbon black Acetal. Shackle, post and hub are grade 316 stainless steel and the padeye of grade 15.5PH stainless steel.

Cheek blocks are shaped from the highest quality alloy to maximize strength, minimize weight and allow for easy maintenance. The unique design also reduces rope wear because of a flare at the block throat.

Great for sheet blocks on cruisers or racing cruisers or high load applications like halyards or backstays. Great for boats up to 14m (46ft).

Part # Description Sheave Diameter Max Rope Max Wire Pin Diameter M.W.L Breaking Load Weight
in mm in mm in mm in mm lbs kg lbs kg oz g

RF64100

Single Block

2 3/8

60

1/2

12

-

-

1/4

6

2200

1000

4410

2000

8.3

235

RF64100AW

Single Block with Aluminum Wire Sheave

2 3/8

60

1/2

12

3/16

5

1/4

6

2200

1000

4410

2000

10.3

292

RF64103

Single Block with Trunnion Snap Shackle Head

2 3/8

60

1/2

12

-

-

-

-

2200

1000

4410

2000

10.1

285

RF64110

Single Block with Removable Becket Pin

2 3/8

60

1/2

12

-

-

1/4

6

2200

1000

4410

2000

9.7

275

RF64108

Halyard Block

2 3/8

60

1/2

12

-

-

5/16

8

2200

1000

4410

2000

6.6

186

RF64108AW

Halyard Block with Aluminum Wire Sheave

2 3/8

60

1/2

12

3/16

5

5/16

8

2200

1000

4410

2000

7.5

212

RF64108A 

Mast Base Block with Removable Clevis Pin Head

2 3/8

60

1/2

12

-

-

5/16

8

2200*

1000*

4410*

2000*

6.4

182

RF64151

Single Foot Block

2 3/8

60

1/2

12

-

-

-

-

2200

1000

4410

2000

6.4

180

RF64202

Double Block with Non-swivel Head

2 3/8

60

1/2

12

-

-

-

-

2200

1000

4410

2000

13.8

390

RF64140

Stand Up Block with Swivel Head Post and Padeye Base

2 3/8

60

1/2

12

-

-

-

-

2200

1000

4410

2000

13.2

372


* Full block rate load can only be achieved with uniformly distributed load across full length of clevis pin.

RF64100 60mm Core Block, Single Price: $84.96 RF64100AW 60mm Core Block, Alum Rope/Wire Sheave Price: $123.21
RF64103 60mm Core Block, Trunnion Snap Shackle Price: $142.76 RF64108 60mm Core Block, Halyard Price: $87.51
RF64108A 60mm Core Block, Mast Base, 8mm Clevis Pin Price: $70.51 RF64108AW 60mm Core Block, Halyard Alum. Rope/Wire Price: $158.06
RF64110 60mm Core Block, Single, Becket Price: $99.41 RF64140 60mm Core Block, Stand-Up Price: $138.51
RF64151 60mm Core Block, Foot Price: $87.51 RF64202 60mm Core Block, Double, Non-Swivel Head Price: $152.96


Ronstan 75mm Core Blocks

Ronstan 75mm Core Blocks

Core blocks are designed to be affordable and friction reduced to nearly half compared to traditional alternatives. It focuses on an exclusive two stage bearing system housed in durable alloy cheeks. The first stage is an ultra low friction system for moderate loads. Stage two is designed for higher loads that engages for superior high stress performance.

High quality materials make up the Core blocks. Sheave are made of U.V. stabilized Acetal or anodized aluminum (AW models). Cheek plates are aluminum alloy. Ball bearings are high compression strength carbon black Acetal. Shackle, post and hub are grade 316 stainless steel and the padeye of grade 15.5PH stainless steel.

Cheek blocks are shaped from the highest quality alloy to maximize strength, minimize weight and allow for easy maintenance. The unique design also reduces rope wear because of a flare at the block throat.

Great for sheet blocks on cruisers or racing cruisers or high load applications like halyards or backstays. Great for boats up to 14m (46ft).

Part # Description Sheave Diameter Max Rope Max Wire Pin Diameter M.W.L Breaking Load Weight
in mm in mm in mm in mm lbs kg lbs kg oz g

RF74100

Single Block

3

75

9/16

14

-

-

5/16

8

3300

1500

6600

1500

12.5

354

RF74100AW

Single Block with Aluminum Wire Sheave

3

75

9/16

14

5/16

8

5/16

8

3300

1500

6600

1500

15.3

432

RF74110

Single Block with Becket and Removable Pin

3

75

9/16

14

-

-

-

8

3300

1500

6600

1500

15.1

428

RF74140

Stand Up Block with Swivel Head Post and Padeye Base

3

75

9/16

14

-

-

-

-

3300

1500

6600

1500

16.5

468

RF74108

Halyard Block with Removable Threaded Pin

3

75

9/16

14

5/16

8

5/16

8

3300

1500

6600

1500

8.3

234

RF74108A

Mast Base Block with Removable Clevis Pin

3

75

9/16

14

5/16

8

5/16

8

3300

1500

6600

1500

8.1

230

RF74151

Single Foot Block

3

75

9/16

14

-

-

-

-

3300*

1500*

6600*

1500*

9.2

259

RF74202

Double Block with Non-swivel Head

3

75

9/16

14

-

-

-

-

3300

1500

6600

1500

17.9

506


* Full block rate load can only be achieved with uniformly distributed load across full length of clevis pin.

RF74100 75mm Core Block, Single Price: $107.06 RF74100AW 75mm Core Block, Alum Rope/Wire Sheave Price: $144.46
RF74108 75mm Core Block, Halyard Price: $98.13 RF74108A 75mm Core Block, Mast Base, 8mm Clevis Pin Price: $71.78
RF74110 75mm Core Block, Single Becket Price: $127.46 RF74140 75mm Core Block, Stand-Up Price: $192.06
RF74151 75mm Core Block, Foot Price: $115.98 RF74202 75mm Core Block, Double, Non-Swivel Head Price: $192.91

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104 Severn Avenue
Annapolis, MD 21403
(410) 268-3676