SKU: 75941118778

Harken 57mm Aluminum Low Load Black Magic Block w/Swivel

$95.37 $105.97
Save 10%
No.2 Bestseller on bieltoni.com >

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 15 - Jul 20

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

Harken 57mm Aluminum Low Load Black Magic Block w/Swivel57mm Aluminum Low Load Black Magic Block with Swivel Black Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep the line from

57mm Aluminum Low Load Black Magic Block with Swivel

Black Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep the line from twisting. Low-load blocks have red isolators. They use Torlon® rollers and 316 stainless steel shackles. Standard blocks have 17-4 PH stainless head posts. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C. 

Specifications:

  • Sheave: 57mm/2-1/4in
  • Length: 119mm/4-11/16in
  • Weight: 154g/5.44oz
  • Shackle Pin: 6mm/1/4in
  • Maximum Line: 12mm / 7/16in
  • Maximum Working Load: 7/16kg / 1655lbs
  • Breaking Load: 1500kg / 3300lb
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 75941118778

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.6 ★★★★★
Based on 1402 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
K
Verified Purchase
Kelly Mikulcik
Boise, US
★★★★★ 5
Great design
Size: 25in
Ball is very durable yet soft. Whistles when you throw it and goes very far. Handle is ergonomic with a nice rubber grip. Both the launcher and ball glow green in the dark. My GSD loves it. She’s 75 lbs and the medium ball is fine.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 23, 2026
R
Verified Purchase
Rider1
San Leandro, US
★★★★★ 5
Husband and dogs highly approve.
Size: 25in
My husband wanted us to replace one from a different company that broke. It had to have a glow in the dark ball, since he sometimes plays fetch with the dogs at night. He couldn’t love this more. Says it’s so much better than the other one, the whole thing glows in the dark and it throws farther. According to him, it’s the best ever.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 9, 2025
M
Verified Purchase
Megan
Los Angeles, US
★★★★★ 4
Glow In The Dark Ball
Size: 18in
I gave this 4/5 stars because the ball is a little small for my dog size so I was hoping the sizing was easier to read. It could have been an error on my end. The ball is great though! It lights up nicely when it is out in the sunlight or under a light for a long periods of time, it lights up at night so you can play with your dog at night when it is cooler!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 2, 2025
B
Verified Purchase
Barbara Wheeler
Lexington, US
★★★★★ 5
Ball launcher
Size: 25in
The toy dog ball laucher well made holds up. Would purchase again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 24, 2025
Z
Verified Purchase
Zealfi
Los Angeles, US
★★★★★ 5
Well designed, well built.
Size: 25in
The stick facilitates powerful, long distance throws. The ball makes a light whistling noise (to help your dog track the ball) through the air, flys far, and has held up well. I live in an area with mountain lions, and they often hunt at night, so I haven’t taken advantage of the glow-in-the-dark feature.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 28, 2026

recommand products

Dunkerque - 1909 - Cap
29.00
ON SEMICONDUCTOR LM385D-2.5G Voltage Reference, Micropower, Shunt - Fixed, LM385 Series, 2.5V, NSOIC-8
114.42
Lindlar - 1966 - Cap
24.95
VISHAY MMA02040E7500BB100 Surface Mount MELF Resistor, 750 ohm, 200 V, 250 mW, ± 0.1%, MMA 0204 Series, Metal Film
174.90
IQD FREQUENCY PRODUCTS LFXTAL010595 Crystal, 25 MHz, SMD, 11.4mm x 4.9mm, 50 ppm, 16 pF, 30 ppm, HC-49/4HSMX Series
73.15