Single Lead Block – 19mm(3/4″) Sheave Diameter
Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers.
Applications:
Typically used in dinghy spars for control lines
Materials:
- U.V. stabilized Acetal sheave
- Grade 316 stainless steel load housing
Sheave Ø:19mm(3/4″)
Max. Rope Ø:8mm(5/16″)
Fastener Ø:5.0mm(3/16″)
M.W.L.:250kg(550lbs)
B. L.:550kg(1,100lbs)
Weight:20g(0.7oz)
SKU:RON-RF917
![Ronstan Series 20 BB Block Single Becket Option Lashing High Load [RF25109HL]](https://www.marinerailparts.com/wp-content/uploads/2026/10/ronstan-series-20-bb-block-single-becket-option-lashing-high-load-rf25109hl.webp)
![Schaefer Series 7 Stand Up Ball Bearing Swivel Block - 2-3/8" 60mm [706-62]](https://www.marinerailparts.com/wp-content/uploads/2026/10/schaefer-series-7-stand-up-ball-bearing-swivel-block-2-3-8-60mm-706-62.webp)
