Harken 3231 75 mm Aluminum Black Magic AirBlock, Swivel
- Brand:
- Harken
- Part no:
- 3231
Image: Fisheries Supply
Where to buy
Specifications
- Sheave diameter
- 75 mm
- Max line diameter
- 14 mm
- Bearing
- Roller
- Swivel
- Swivel
The Harken 3231 is a 75 mm Black Magic AirBlock with aluminum sideplates and Torlon roller bearings. It has a three-way head: a set screw locks the shackle in the front or side position, or the block can swivel to keep line from twisting. Maximum working load is 5000 lb with a breaking load of 10,000 lb, and the block takes line up to 14 mm. It weighs 11.68 oz.
Our take
A 5000 lb working load at 11.68 oz pairs the aluminum sideplates with Torlon roller bearings, and the 75 mm sheave takes line up to 14 mm. The three-way head lets you lock the shackle front or side, or leave the block free to swivel.
From our buying guide
Ball-bearing blocks give the lowest friction on lines running under moderate loads. Plain bearings have more friction, but handle very high and static loads.
Check before you buy:
- A ratchet block is rated for the full sheet load.
- Any becket's load limit suits the job, since a becket can be rated below the block itself.
- A soft-attach block will be looked after, since Harken warns soft attachments are prone to wear and recommends them only for regularly maintained race boats.