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Description
Ronstan Orbit Series 75 Double BlockProduct Description Ronstan Orbit Series 75 Double Block Features The highest strength to weight ratio Minimal friction loss, especially when working at high loads Totally reliable and trouble free performance Simplicity of design and construction to facilitate maintenance and servicing Elegant, functional styling and finish. Lockable swiveling head post High strength forged shackle Sheave 3 in. Max. Rope 9 16 in. Max. Wire in. Pin 5 16 in. Max.
Product Description
Ronstan Orbit Series 75 Double Block
Features
The highest strength-to-weight ratio
Minimal friction loss, especially when working at high loads
Totally reliable and trouble free performance
Simplicity of design and construction to facilitate maintenance and servicing
Elegant, functional styling and finish.
Lockable swiveling head post
High strength forged shackle
Sheave Ø - 3 in.
Max. Rope Ø - 9/16 in.
Max. Wire Ø - in.
Pin Ø - 5/16 in.
Max. Working Load - 7500 lb
B. L. - 14990 lb
Weight - 20.3 oz
Product Information
Orbit blocks™ are a no-compromise product range developed to meet the demands and expectation of the very dedicated and increasingly professional racing sailor. Side cheeks incorporating head structure and hub are precision machined as a single part from solid alloy, leaving material only where it contributes to the load carrying capacity of the block and eliminating the need for additional fasteners. The Orbit sheave has captive Acetal ball bearings for side thrust loads, eliminating the need for side retainer plates. This reduces weight and allows for a wider bearing surface that can accommodate longer Torlon® needles – achieving a substantially higher strength-to-weight ratio.
Head posts of swivel blocks can be locked at 0 or 90 degrees.
Applications
Primary mainsheet, halyard and spinnaker systems on boats to 14m (46ft)
Secondary mainsheet, vang blocks on boats to 15m (50ft)
Standard and running backstay systems on boats to 12m (40ft)
General control line and lead block applications on larger yachts
Materials
Fully machined Alloy cheek plates
Alloy sheaves with captive ball races
Torlon® needle rollers
Carbon black Acetal ball bearings
Forged grade 17-4PH stainless steel shackles
Grade 316 stainless steel head post
Features
Sheave Ø - 3 in.
Max. Rope Ø - 9/16 in.
Max. Wire Ø - in.
Pin Ø - 5/16 in.
Max. Working Load - 7500 lb
B. L. - 14990 lb
Weight - 20.3 oz
Product Information
Orbit blocks™ are a no-compromise product range developed to meet the demands and expectation of the very dedicated and increasingly professional racing sailor. Side cheeks incorporating head structure and hub are precision machined as a single part from solid alloy, leaving material only where it contributes to the load carrying capacity of the block and eliminating the need for additional fasteners. The Orbit sheave has captive Acetal ball bearings for side thrust loads, eliminating the need for side retainer plates. This reduces weight and allows for a wider bearing surface that can accommodate longer Torlon® needles – achieving a substantially higher strength-to-weight ratio.
Head posts of swivel blocks can be locked at 0 or 90 degrees.
Applications
Materials
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.7 ★★★★★
Based on 17 reviews
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Product Reviews
★★★★★ 4
Quality and durable socks
Size: Large, Color: White (6-pairs), Number of Items: 6
Great quality socks. This pack was a lot taller on the cuff and bigger than previous batches I have had. Not sure what the change was, but giving it 4 instead of 5 because I preferred the smaller shorter ones they previously made. But these are great quality socks, and last a long time.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 8, 2026
★★★★★ 5
A Game-Changer for Comfort
Size: Medium, Color: Black, Number of Items: 6
I recently upgraded my workout gear with the Under Armour Training Cotton Quarter Socks, and I must say, these socks have revolutionized my exercise experience. Comfortable, durable, and stylish, they truly stand out in the crowded world of athletic socks.
First and foremost, the comfort level of these socks is unparalleled. The blend of cotton and synthetic materials provides a soft and plush feel against my feet, making every step a pleasure. The quarter length strikes the perfect balance, offering ample coverage without being too restrictive or too short. It's like walking on clouds, even during the most intense workouts.
One of the standout features is the moisture-wicking technology. I've worn these socks during high-intensity cardio sessions, and they have consistently kept my feet dry and comfortable. The breathability is remarkable, preventing that uncomfortable feeling of sweaty feet that often accompanies strenuous workouts. No more distractions – just focus on pushing through your fitness routine.
Durability is another strong suit of these socks. After numerous washes, they maintain their shape and elasticity, showing no signs of wear and tear. The reinforced heel and toe areas provide extra support, ensuring longevity and preventing the dreaded sock holes that often plague other brands.
The sleek design of the Under Armour Training Cotton Quarter Socks adds a touch of style to my workout attire. The subtle logo and choice of colors make them versatile enough to pair with any athletic shoes. Whether you're hitting the gym, going for a run, or simply running errands, these socks seamlessly blend fashion with function.
In terms of sizing, I found that they fit true to size. The elastic band around the arch provides a snug yet comfortable fit, ensuring that the socks stay in place throughout any activity.
While the price point may be slightly higher than some other options on the market, the quality and performance of the Under Armour Training Cotton Quarter Socks more than justify the investment. When it comes to comfort, durability, and style, these socks have become an indispensable part of my workout wardrobe.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 3, 2024
★★★★★ 5
Well made
Size: Large, Color: Black (6-pairs), Number of Items: 6
These are the only socks that my 12 year old Grandson will wear. He's very picky. LOL
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 2, 2026
★★★★★ 5
Comfort and durability
Size: Large, Color: White (6-pairs), Number of Items: 6
Socks work really good. I have very rough and dry feet that tear up my bed sheets. They hold up to my destructive feet. They are soft and comfy!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 14, 2025
★★★★★ 5
Cotton socks
Size: Large, Color: Black (6-pairs), Number of Items: 6
I really love the cotton material. These socks are excellent quality, they don't wear out, my feet don't sweat, and they don't slip on the floor. I highly recommend them!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 29, 2025
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