YF-Series Brushless Electric Screwdrivers

Quick Answer

The YF-Series is a programmable brushless electric screwdriver system designed for medium- to high-torque production fastening applications. Paired with the YFC-35D controller, the system provides programmable speed, angle, soft start, multi-hit fastening, auto reverse, screw counting compatibility, and repeatable torque control for demanding manufacturing environments.

Who This Is For

Manufacturing engineers
Process engineers
Automation engineers
Quality engineers
Production supervisors
Electronics manufacturers
Medical device manufacturers
Aerospace manufacturers
Automotive manufacturers
Industrial assembly facilities

When Should You Use This?

Use the YF-Series when:

Programmable fastening is required
Multiple fastening parameters are needed
Medium- to high-torque production fastening is performed
Continuous-duty operation is required
Adjustable speed and angle control are important
Soft Start or Multi-Hit fastening improves joint quality
Screw counting or error-proofing is required
ESD-safe tools are needed

When Should You NOT Use This?

The YF-Series may not be the best choice when:

A simple mechanical clutch screwdriver is sufficient
Torque-angle traceability with full data collection is required
Portable or cordless fastening is preferred
Applications require advanced networked controllers or transducerized fastening systems

For advanced torque-angle monitoring and complete fastening traceability, consider the Mountz ECT-Series or HD-Series.

How the YF-Series Works

The YF-Series combines a brushless electric screwdriver with the programmable YFC-35D controller.

During operation, the system:

Automatically controls screwdriver speed and torque.
Allows operators to program fastening speed, angle, Soft Start, and Multi-Hit parameters.
Supports programmable automatic reverse after fastening.
Provides LED tool status indication.
Protects the screwdriver through built-in Over Heat Protection (OHP) and Over Current Protection (OCP).
Can integrate with the Mountz Scout Screw Counter for screw counting and error-proofing.

Result:

Accurate torque control
Repeatable fastening performance
Reduced maintenance
Increased production flexibility
Improved assembly quality

Core Features

YF-Series System

High-performance 4-pole brushless motor
Precision automatic shut-off clutch
Programmable speed control
Programmable angle control
Programmable Soft Start (30–2000 ms)
Programmable Multi-Hit mode
Programmable auto reverse
Three-step multi-sequence mode
External torque adjustment
Continuous-duty operation with minimal heat buildup
Over Heat Protection (OHP)
Over Current Protection (OCP)
LED tool status display
Scout Screw Counter compatible
ESD-safe construction
Automation models available with remote I/O
Requires the YFC-35D controller

Configuration Options

Configuration	Best For
Lever Start	Standard production fastening
Push-to-Start	High-volume repetitive fastening
Pistol Grip	Improved ergonomics
Automation Models	PLC integration and remote operation

Available Screwdriver Models

The YF-Series includes brushless electric screwdrivers covering torque ranges from 6.1 to 86.8 lbf.in (68.7–981 cN·m). Models are available in lever-start, push-to-start, and pistol-grip configurations. Automation versions with external I/O are also available upon request.

YF-Series Model Chart

Model	Item Number	Configuration	Torque Range	Adjustable RPM	Drive Size
YF35N-A ESD	145966	Lever Start	6.1–30.4 lbf.in	500–1500	1/4" Female Hex
YF35NP-A ESD	145967	Push-to-Start	6.1–30.4 lbf.in	500–1500	1/4" Female Hex
PYF35NP-A ESD	145900	Pistol Grip	6.1–30.4 lbf.in	500–1500	1/4" Female Hex
YF50N-A ESD	145968	Lever Start	8.7–43.4 lbf.in	400–1100	1/4" Female Hex
YF50NP-A ESD	145969	Push-to-Start	8.7–43.4 lbf.in	400–1100	1/4" Female Hex
PYF50NP-A ESD	145901	Pistol Grip	8.7–43.4 lbf.in	400–1100	1/4" Female Hex
YF100N-A ESD	145970	Lever Start	34.7–86.8 lbf.in	250–500	1/4" Female Hex
PYF100NP-A ESD	145902	Pistol Grip	34.7–86.8 lbf.in	250–500	1/4" Female Hex

Specifications are based on the YF-Series Product Bulletin.

YFC-35D Controller

The YFC-35D controller provides programmable fastening control for every YF-Series screwdriver.

Controller Specifications

Controller	Item Number	Input	Output	Compatible Drivers
YFC-35D	145877	110/230 VAC, 50–60 Hz	DC35V, 5A	All YF-Series models

Model Selection Guide

If you need:	Recommended Model
General production fastening	YF35 Series
Medium-torque applications	YF50 Series
High-torque fastening	YF100 Series
Push-to-start operation	YF35NP or YF50NP
Improved ergonomics	PYF Pistol Grip models
Automation integration	Automation versions with external I/O
Programmable fastening strategies	Any YF-Series with YFC-35D controller

Compatible Accessories

Accessory	Purpose
YFC-35D Controller	Required controller for all YF-Series screwdrivers
Mountz Scout Screw Counter	Screw counting and error-proofing
1/4" Hex Power Bits	Fastening applications
Tool Balancer	Reduces operator fatigue during repetitive fastening
Torque Cover	Helps prevent accidental torque adjustment
Automation I/O Interface	Enables remote start, driver lock, and reverse functions on automation models

YFC-35D Controller Overview

The YFC-35D controller provides programmable control for all YF-Series screwdrivers, allowing operators to configure fastening parameters for a wide range of production applications.

Key controller capabilities include:

Programmable speed adjustment
Programmable angle control
Soft Start programming (30–2000 ms)
Programmable Multi-Hit mode
Programmable automatic reverse
Three-step multi-sequence mode (CW angle, CCW angle, and holding time)
LED tool status display
Over Heat Protection (OHP)
Over Current Protection (OCP)
Compatibility with the Mountz Scout Screw Counter

The controller operates from 110/230 VAC input and provides 35 VDC, 5A output for all YF-Series screwdriver models.

Setup & Adjustment

Connect the YF-Series screwdriver to the YFC-35D controller.
Connect the controller to an appropriate AC power source.
Install the correct 1/4" hex driver bit for the application.
Program the desired fastening parameters, including speed, Soft Start, angle, Multi-Hit mode, and automatic reverse.
Adjust the external torque setting on the screwdriver.
Verify torque output using a calibrated torque analyzer before production.
If using an automation model, connect the external I/O for remote start, driver lock, or reverse functions.
If required, connect the Mountz Scout Screw Counter for screw counting and error-proofing.
Perform sample fastening cycles and verify all programmed settings before beginning production.

Common Applications

The YF-Series is commonly used in:

Electronics assembly
Medical device manufacturing
Aerospace assembly
Automotive manufacturing
Industrial equipment assembly
High-volume production lines
Production environments requiring programmable fastening
Assembly processes requiring screw counting and error-proofing

Use Cases (Real-World Examples) Multi-Product Production Lines

Problem: Different assemblies require different torque values, speeds, and fastening sequences throughout production.

Solution: The YFC-35D controller allows operators to program fastening parameters such as speed, angle, Soft Start, Multi-Hit mode, and automatic reverse, reducing setup time between products.

Soft Joint Applications

Problem: Soft materials can produce inconsistent clamp loads when tightened using conventional fastening methods.

Solution: The programmable Multi-Hit mode helps improve fastening consistency by applying additional controlled tightening cycles for soft joint applications.

ESD-Sensitive Manufacturing

Problem: Electrostatic discharge can damage sensitive electronic components during assembly.

Solution: All YF-Series models are ESD designed to help reduce electrostatic discharge in static-sensitive manufacturing environments.

High-Volume Production

Problem: Continuous production environments require fastening tools that operate reliably with minimal maintenance.

Solution: The brushless motor minimizes maintenance while generating minimal heat during continuous-duty operation, making the YF-Series well suited for high-production manufacturing.

Automation Integration

Problem: Automated workstations require fastening tools that can be remotely controlled by production equipment.

Solution: Automation versions of the YF-Series are available with external I/O for remote start, driver lock, and reverse operation, allowing integration into automated assembly systems.

Maintenance

Verify torque output regularly using a calibrated torque analyzer.
Inspect the drive spindle and bit holder for wear or damage.
Keep the screwdriver and controller clean and free of dust and debris.
Inspect all cables and electrical connections before operation.
Verify the controller is operating normally and check for status or fault indications.
Replace worn driver bits as needed to maintain fastening accuracy.
Periodically confirm programmed fastening parameters as part of your preventive maintenance program.

Integration & Advanced Features

The YF-Series is designed to support modern production environments through programmable fastening control and flexible integration.

Key features include:

High-performance 4-pole brushless motor
Precision automatic shut-off clutch
Intelligent YFC-35D controller
Programmable speed control
Programmable angle control
Soft Start programming
Multi-Hit fastening mode
Automatic reverse
Three-step multi-sequence fastening
External torque adjustment
LED tool status indication
Over Heat Protection (OHP)
Over Current Protection (OCP)
Scout Screw Counter compatibility
Automation models available with external I/O for remote start, driver lock, and reverse functions
Continuous-duty operation with low heat generation
ESD-safe construction
Designed for high-volume production environments

Media & Supporting Content

Need Help?

Contact Applications Engineering for setup guidance
Speak with Sales for product selection
Call us:
- North America:(408) 850-9978
- International: +44 1428 741756

YF-Series Brushless Electric Screwdrivers – FAQ & User Guide