DSSERVO BLS3355 All-Metal Brushless Digital Servo, 55kg Class

Description

DSSERVO BLS3355 is an all-metal brushless digital servo marketed in the 55 kg class. Its product artwork identifies a 5–8.4 V supply range and IP67-rated protection. The “55 kg” marking is a product class label; voltage-specific torque, speed and current require confirmation from DSSERVO. The supplied performance data is inconsistent, so these values are not listed here.

All-metal build and weather protection

The BLS3355 product illustration shows a CNC aluminum middle shell, stainless-steel gears, output gear, waterproof gaskets, top and bottom bearings, and a brushless motor. The product artwork states IP67. Protect the system connector and installation according to their own ratings; the servo rating does not make the complete vehicle or robot waterproof.

Fitment and dimensions

The supplied BLS3355 dimensional graphics show a 40 × 20 mm body footprint, approximately 38 mm body height, 45.5 mm maximum height, 54.5 mm overall mounting-tab span and 49.5 mm mounting reference. Check the mounting holes, clearance, output spline and selected horn against the drawing and your installation before ordering. A packaged shipping weight is not provided here.

PWM control and wiring

The supplied control diagram identifies a JR-style 3-pin, 2.54 mm connector and PWM position control. It shows a 500–2500 µs pulse range, 1500 µs neutral, 2 µs deadband, 50–330 Hz operating frequency and 180° or 270° control options. The graphic shows brown or black as ground, red as positive supply, and orange or white as signal. Confirm connector polarity and the actual travel configuration before powering the servo. Test the linkage unloaded and set endpoints to prevent mechanical binding.

Applications

The product graphic presents the BLS3355 for 1:8, 1:10 and 1:12 RC cars or robotics. Select a servo using the actual load, linkage geometry, horn length, controller travel and power-supply capacity. The model-specific voltage/current performance table needs confirmation before designing around peak torque or current.

Package contents

The supplier quotation lists one BLS3355 digital metal servo, one 25T adjustable metal servo arm and an accessory set “like pictures.” It does not enumerate every accessory or quantity. Confirm a specific horn, fastener or accessory quantity before purchase if it is critical.

Frequently asked questions

Does 55 kg mean 55 kg of continuous force? No. It is the class marking shown on the product artwork. Stall torque is a locked-shaft rating and must not be treated as continuous output.

What torque and speed should I use for design? Ask DSSERVO for a model-matched performance table before sizing the load or power supply.

Is the whole RC car IP67? No. IP67 is the rating stated for the servo; the connector, cable entry and other electronics need suitable installation protection.