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KO BSx4S-Grasper Std w/Selector 4S
Brand: KO Propo
Part No: SCH-KO30221
Out Of Stock
Request Stock NotificationThe KO Propo BSx4S-Grasper Std w/Selector 4S (SCH-KO30221) brings the acclaimed Grasper philosophy of strong positional holding to a standard-size, brushless servo. With rapid response at 0.09s/60° and a class-leading 40.0kgf·cm of torque at 7.4V, it delivers confident steering authority and precision for demanding RC applications.
Durability matches the performance. A reinforced stainless steel final gear receives nitriding treatment to withstand maximum torque, while the serration height is set slightly higher to accommodate multiple servo horn types (tooth count and diameter remain unchanged). A hard alumite aluminium gear train, dual ball bearings, a hard servo gear shaft, and an aluminium top case with a heat-sink middle case complete a robust, thermally efficient build. Black cable and gold-plated connector, plus Serial and HCS compatibility, round out the spec. Made in Japan.
Holding Power Explained
Holding power is the force with which the servo output shaft maintains its position. True to its name, the Grasper captures the surface feel and holds the intended line with authority, contributing to consistent cornering performance.
Key Specifications
- Torque & speed @7.4V: 40.0kgf·cm, 0.09s/60°
- Torque & speed @6.0V: 33.0kgf·cm, 0.12s/60°
- Reference @8.4V: 44.0kgf·cm, 0.08s/60°
- Dimensions: 40.4 × 37.5 × 20mm (standard size)
- Weight: 76.5g
- Operating voltage: 6.0–7.4V (LiPo, LiFe, Ni-MH)
- Brushless motor
- Reinforced stainless steel final gear with nitriding treatment
- Hard alumite aluminium gear
- Dual ball bearings; hard servo gear shaft
- Aluminium top case; aluminium heat-sink middle case
- Black cable; gold-plated connector
- Serial compatible; HCS compatible
- Made in Japan
Suggested Applications
- Suggested compatibility: 1/8 Off Road
- Suggested compatibility: 1/8 On Road
- Suggested compatibility: 1/8 GT
- Suggested compatibility: 1/10 EP Off Road
Secured by Stripe
What is holding power
The holding force is the force that the servo shaft tries to hold a position. Grasper has meanings such as "grasping tightly" and "grasping firmly", and is a name that expresses the characteristics of this servo that firmly captures the road surface.
Reinforced stainless steel final gear
The durability of the servo has been strengthened to match the improved servo specifications. Stainless steel is used for the final gear. Furthermore, nitriding treatment has been applied to achieve the strength to withstand the maximum torque of 40.0kgf.cm(@7.4V). In addition, the height of the serrations on the final gear has been adjusted slightly higher to allow the use of multiple servo horns. The number of teeth and diameter of the serrations are unchanged.
[Specifications]
#Torque: 40.0Kg-cm Speed: 0.09sec/60deg(@7.4V)
#Torque: 33.0Kg-cm Speed: 0.12sec/60deg(@6.0V)
Reference Spec
#Torque: 44.0Kg-cm Speed: 0.08sec/60deg(@8.4V)
#Dimensions: 40.4×37.5×20mm (Standard size)
#Weight: 76.5g
#Operating voltage: 6.0～7.4V (Lipo, Life, Ni-MH)
#Brush-less motor
#Reinforced stainless steel final gear
#Hard alumite aluminum gear
#Dual ball bearings
#Hard servo gear shaft
#Aluminum top case
#Aluminum heat sink middle case
#Black cable
#Gold plated connector
#Serial Compatible
#HCS Compatible
#Recommend category
1/8 Off road, 1/8 On road, 1/8GT, 1/10 EP Off road
Made in Japan.
Key Info:
- Brand: KO Propo
- Part No: SCH-KO30221
- Barcode: 5051294177775
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