![Ronstan Series 30 Ball Bearing Block - Single - Loop Top [RF30101]](https://cdn.shopify.com/s/files/1/0855/3916/0358/files/55171XL.jpg?v=1706698073)
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Ships within 48 hours · Estimated delivery Aug 6 - Aug 11
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Description
Ronstan Series 30 Ball Bearing Block - Single - Loop Top [RF30101]Series 30 Ball Bearing Block Single Loop Top Features: Low friction 2 stage ball bearing system provides consistent performance over the full working load range High static and dynamic load capacity Light weight Versatile head fittings Sheaves running on Acetal or Torlon ball bearings provide high performance & low friction Can be fitted with a shackle in either of two planes to allow correct alignment of the block Applications: Primary lead blocks on
Series 30 Ball Bearing Block - Single - Loop Top
Features:
- Low friction 2-stage ball bearing system provides consistent performance over the full working load range
- High static and dynamic load capacity
- Light weight
- Versatile head fittings
- Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction
- Can be fitted with a shackle in either of two planes to allow correct alignment of the block
Applications:
- Primary lead blocks on dinghies and catamarans
- Control lines on larger yachts
Materials:
- U.V. stabilized Acetal sheaves
- Acetal ball bearings
- Impact modified, fiber reinforced and U.V. stabilized Nylon cheeks
- Grade 316 stainless steel load straps and head fittings
Specifications:
Sheave Ø: 30mm(1-3/16")
Max. Rope Ø: 8mm(5/16")
M.W.L.: 300kg(660lbs)
B. L.: 750kg(1,650lbs)
Weight: 28g(1.0oz)
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 21 reviews
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Product Reviews
★★★★★ 5
Worth it for peace of mind to have in car
Works as described. Have used twice now. Takes a few minutes but will put air in tire. The cord is long enough to reach every tire.
Certainly loud when using
car must be on to use
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Reviewed in the United States on February 19, 2026
★★★★★ 5
Great true inflator
Great tire inflator also own a jumper pack in this brand, easy to use and great function to set the disired psi and auto shut off.
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Reviewed in the United States on January 18, 2026
★★★★★ 5
Delivers great PSI for a small package
Unit works great ! I love the fact you can preset the psi. cut off ( I had to pump up some air shocks to 135 the unit did it with no problem ! )
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Reviewed in the United States on May 6, 2026
★★★★★ 4
Good inflator
Not the best one but works well!
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Reviewed in the United States on March 8, 2026
★★★★★ 5
Excellent Value for Price
I highly recommend one of these in your vehicle for emergencies. Don't fall for those handheld cordless ones you see on social media. Those will only inflate 1-2 tires before depleting. You have unlimited power for the plugins and it will inflate at least 4x faster.
The AstroAI is compact, lightweight and powerful for its price. Everything folds into its rectangular form factor for easy storage. The UI is simple and to the point. You can easily set the target pressure and it will auto stop. It's also a nice looking design with black and yellow which are common colors for power tools and emergency equipment.
If I were being picky, the 2 minor cons that you'll find in other brands are: no option to plug into wall outlet & doesn't come with a case or bag.
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Reviewed in the United States on November 22, 2025