# Harken 40mm Twing Block [2699]

**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

  
[Owner's Manual (pdf)](https://productimageserver.com/literature/ownersManual/103566OM.pdf)

## Details

- **Price:** 77.35 USD
- **Type:** Fishing Accessories
- **Tags:** 1st Class Eligible, Brand_Harken, Hunting & Fishing, Hunting & Fishing | Fishing Accessories, MAP

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 77.35 USD | In stock |

## Images

- Harken 40mm Twing Block [2699] Harken

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> Source: [Besafe1st](https://besafe1st.com/products/harken-40mm-twing-block-2699)
> Updated: 2026-05-21