16mm Forkhead Block
The 16 mm is Harken’s® smallest block. It is perfect for small synthetic control lines found on high-tech dinghies. The patented bearing system uses stainless steel balls in a captive grooved race and has a 250 lb (113 kg) maximum working load.
Specifications:
- Sheave: 16mm / 5/8in.
- Length: 29mm / 1-1/8in.
- Weight: 11g / .38oz
- Maximum line: 5mm / 7/32in
- Maximum working load: 113kg/ 250lb
- Breaking load: 544kg / 1200lb

![Ronstan Series 30 Fiddle Block - Narrow w/Tube Rivet HeadV-Jam Cleat [RF187]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-series-30-fiddle-block-narrow-w-tube-rivet-headv-jam-cleat-rf187.webp)
![Ronstan Kite Block - Black w/White Sheave (Pair) [RF13101-2]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-kite-block-black-w-white-sheave-pair-rf13101-2.webp)
![Ronstan Race Sheave - Rope/Wire - Nylatron - 25mm (1") OD [RF131]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-race-sheave-rope-wire-nylatron-25mm-1-od-rf131.webp)
![Ronstan Series 20 Ball Bearing Block - Double - 2-Axis Shackle Head [RF20202]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-series-20-ball-bearing-block-double-2-axis-shackle-head-rf20202.webp)
![Ronstan Race Acetal Sheave - 39mm (1-1/2") OD [RF251]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-race-acetal-sheave-39mm-1-1-2-od-rf251.webp)
![Ronstan Series 20 Ball Bearing Block - Upright Lead [RF20171]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-series-20-ball-bearing-block-upright-lead-rf20171.webp)
![Ronstan Race Sheave - Acetal Ball Bearing - 28mm (1-1/8") OD [RF1020]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-race-sheave-acetal-ball-bearing-28mm-1-1-8-od-rf1020.webp)
![Ronstan Series 20 Ball Bearing Block - Swivel Hook Head [RF20180]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-series-20-ball-bearing-block-swivel-hook-head-rf20180.webp)