mouseover to enlarge
100 mm Runner Block 100 mm Runner Block
click thumbnail to select

Black Magic® Air Runner®

100 mm Runner Block

Part No. 3251
$715.20  Not available on-line. Please contact your Harken dealer.
Sheave Ø (mm)100 mm
Sheave Ø (in)3 15/16 in
Maximum line Ø (mm)16 mm
Maximum line Ø (in)5/8 in
Maximum working load (kg)3402 kg
Maximum working load (lb)7500 lb

Runners are used on running backstays of offshore boats to adjust mast bend for different wind conditions.

Integrated sideplate bails and recessed cotter key help produce a smooth design that won’t snag lifelines.

Sideplates and sheaves Hard Lube-anodized for maximum UV protection and a smooth surface. Center cage keeps Torlon® roller bearings separated and parallel to reduce friction.

Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.

Sheave Ø (mm)100 mm
Sheave Ø (in)3 15/16 in
Length (mm)157 mm
Length (in)6 3/16 in
Weight (g)481 g
Weight (oz)17 oz
Clevis pin Ø (mm)15.9 mm
Clevis pin Ø (in)5/8 in
Maximum line Ø (mm)16 mm
Maximum line Ø (in)5/8 in
Maximum working load (kg)3402 kg
Maximum working load (lb)7500 lb
Breaking load (kg)6802 kg
Breaking load (lb)15000 lb
DWG: 3251.DWG (open/save)
DXF: 3251.DXF (open/save)
IGS: 3251.IGS (open/save)
EPS: 3251.eps (open/save)
High-res JPG: 3251.jpg (open/save)
  • United States
  • Australia
  • France
  • Italia
  • New Zealand
  • Polska
  • Sverige
  • UK