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Description
40mm Twing Block
Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads for safe, easy trimming.
Features:
- Opening side plate - Easy to rig and remove from sheet
- Spring biased to open when unlatched - One-handed operation
- Roller at pivot base - Use 1:1 or 2:1 up-down control
- Carbo Air® block construction - High strength for durability and lightweight for maximum float in light air
Uses:
- Dinghies, sport boats, and small keelboats
- Spinnaker sheet and guy control
- Code zero sheet up-down control
Specifications:
- Sheave Ø (mm): 40 mm
- Sheave Ø (in): 1-9/16 in
- Length (mm): 89 mm
- Length (in): 3-1/2 in
- Weight (g): 86 g
- Weight (oz): 3 oz
- Maximum line Ø (mm): 12 mm
- Maximum line Ø (in): 3/8 in
- Maximum working load (kg): 275 kg
- Maximum working load (lb): 606 lb
- Breaking load (kg): 825 kg
- Breaking load (lb): 1818 lb
Accessories
No accessories listed for this product.
Specifications
| SKU | 2699 |
| UPC | 097653296966 |
| Brand | Harken |
| Category | Sailing |
| Country of Origin | — |
| Weight | 0.22 |
| Dimensions | 6 x 3 x 1 |
| Status | Active |
| Last Synced | 8/17/2026, 1:13:21 AM |
Compliance & Shipping
Returnable
Product Literature
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Frequently Bought Together
Compare Key Features
| Feature |  Harken 40mm Twing Block CURRENT |  Ronstan Series 30 Ball Bearing Orbit Block™ - Cheek |  Ronstan Series 30 Ball Bearing Orbit Block - Triple - Becket |  Harken 40mm Carbo Block 90° Fixed Head |  Barton Marine Ratchet Block - 55mm |
|---|---|---|---|---|---|
| Price | $65.75 | $19.25 | $57.81 | $41.35 | $111.66 |
| Brand | Harken | Ronstan | Ronstan | Harken | Barton Marine |
| Condition | New | New | New | New | New |
| Availability | In Stock | In Stock | In Stock | In Stock | In Stock |
| Weight | 0.22 | 0.06 | 0.19 | 0.11 | 0.3 |
| Dimensions | 6 x 3 x 1 | 4 x 2 x 1 | 4 x 2 x 2 | 5 x 3 x 1 | 6 x 3 x 2 |
| SKU | 2699 | RF35151 | RF35312 | 2659 | 90500 |
| Country | — | INDONESIA | INDONESIA | UNITED STATES | — |
| View Item | View Item | View Item | View Item | View Item |
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$65.75