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Ships within 48 hours · Estimated delivery Jul 6 - Jul 11
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Description
HobbyStar HCS-4521 High-Torque Digital Waterproof Crawler ServoThe HobbyStar HCS 4521WP servo features a fully waterproof design and massive torque (444oz in @7. 4V) for the ultimate crawler servo. All steel gears for reliable operation and an aluminum center case to aid in cooling and add strength this is a perfect servo for crawling rig. Specifications: Speed @4. 8V: 0. 16 sec Speed @6. 0V: 0. 13 sec Speed @7. 4V: 0. 10 sec Torque @4. 8V: 287 oz in Torque @6. 0V: 347 oz in Torque @7. 4V: 444 oz in Pulse
The HobbyStar HCS-4521WP servo features a fully waterproof design and massive-torque (444oz/in @7.4V) for the ultimate crawler servo. All-steel gears for reliable operation and an aluminum center-case to aid in cooling and add strength this is a perfect servo for crawling rig.
Specifications:
- Speed @4.8V: 0.16 sec
- Speed @6.0V: 0.13 sec
- Speed @7.4V: 0.10 sec
- Torque @4.8V: 287 oz/in
- Torque @6.0V: 347 oz/in
- Torque @7.4V: 444 oz/in
- Pulse/Frequency: 1500µ/330Hz
- Dimensions: (LxWxH) 40.5x20x37.5mm
- Weight: 58g
- Bearing: Dual ball bearing
- Gears: Steel
- Motor: Digital Coreless
- Input Voltage: 4.8V-7.4V
- Output Shaft: 25T spline
- Wire Harness Length: 260mm
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
4.1 ★★★★★
Based on 1302 reviews
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Product Reviews
★★★★★ 5
Great buy
Color: Orange
My did loves this ball
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Reviewed in the United States on May 27, 2026
★★★★★ 5
Our German Sheppard loves these
Size: Medium
These cost a bit more than tennis balls, but they are so much nicer and longer lasting. For starters, they stay cleaner than tennis balls because they’re smooth rubber. Dirt won’t build up on them and if anything does stick, like grass or soil, it falls off once the dog slobber dries. They’re also thick, so they don’t fall apart or blow out like a normal tennis ball does in our dog’s jaws after 30 seconds. Our GS chomps on these like crazy and the only damage they’ve suffered is a crack that developed from the edge of the hole, but the crack is growing very slowly and none of these balls have totally failed yet. The balls do whistle when thrown ant high speed and that may help a dog track and locate it, but I’m not sure. Our neighbors hear the whistling too so it’s far from silent. Lastly the orange ball is easy to locate out in our yard, but the dark blue practically disappears.
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Reviewed in the United States on April 6, 2025
★★★★★ 5
Great for smaller dogs
Size: Small
These two balls are perfect for the smaller mouthed dog that loves to play fetch.
These balls are not only super durable (lots of teeth biting), but float in the baby pool we use for our miniature dachshunds.
The value here is much better than you’d find anywhere else. The noise, if bitten hard enough, was “low” at best. Easy to spot/find if overthrown. Will definitely buy again once these are in bad repair; so far, so good-love these for my fur babies!
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Reviewed in the United States on October 8, 2024
★★★★★ 5
My dogs favorite balls
Size: Medium
These are great for my dog who always has to have a ball in her mouth. Not too hard so I don't have to worry about her teeth. They last for ever. They do lose their shape a little over time (like I said, she always has a ball in her mouth) they become a little oval in shape. They still bounce, she still chases it and she still chews on it so I don't think she notices or cares. I've gotten her a bag full of these over time and I have only seen one that she chewed a chunk out.
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Reviewed in the United States on September 28, 2023
★★★★★ 5
My Dachshunds Love These
Size: Small
These balls are durable, flexible material, highly chewable without being easily destroyed. I stuff them with Milkbone Maro Snacks, which are just the right size to twist into the holes in the ball. My dogs literally get an hour+ chewing and chasing entertainment from these. They chew them, they sometimes 'pop' out of their mouths, go rolling across the floor, dogs chasing them. This satisfies their urge to hunt prey. Dachshunds can easily tear this kind of stuff-it-toy apart. These have lasted for a long time without tearing or shredding. I would NOT recommend them for a dog much larger than a tweenie weenie. They're a bit on the small side and might be swallowed by a larger dog. It would be cool it they also came in a larger size (and probably ball wall thickness also) for the bigger dogs to enjoy. These stuff-it chew balls are better than the kong balls my dogs had before these. Highly recommend them.
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Reviewed in the United States on April 19, 2024