![Ronstan Series 40 Ball Bearing Block – Single – Universal Head[RF40100]](https://www.boatmotorwarehouse.com/wp-content/uploads/2026/10/ronstan-series-40-ball-bearing-block-single-universal-head-rf40100.webp)
Series 40 Ball Bearing Block – Single – Universal Head
Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.Captive Lock universal head can be fixed in either of two planes, or free to swivel as required.
Features:
- Low friction Acetal or Torlon® bearing system
- Lightweight
- Cheek cut-outs for easy bearing maintenance
- Captive Lock universal head
- Slotted pin shackle eliminates fouled lines
Applications:
- Mainsheet
- Halyard
- Vang
- Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8M(26′)
Materials:
- U.V. Stabilized Acetal sheaves
- Acetal ball bearings
- Impact and U.V. resistant, fiber reinforced Nylon cheeks
- Grade 316 stainless steel load strap and head fitting
Specifications:
Sheave Ø:40mm(1-9/16″)
Max. Rope Ø:10mm(7/16″)
Pin Ø:5mm(3/16″)
M.W.L.:350kg(770lbs)
B. L.:1,000kg(2,200lbs)
Weight:70g(2.5oz)
View AllClose
