FG Preset Torque Screwdrivers

Quick Answer

FG preset torque screwdrivers deliver a fixed, repeatable torque using a precision cam-over clutch mechanism. They are ideal for assembly environments where operators repeatedly fasten components at the same torque setting and where over-torque prevention is critical.

Who This Is For

Manufacturing & process engineers
Assembly operators
Quality & calibration teams
Aerospace, electronics, and medical device manufacturers
CX and Sales teams supporting precision torque tools
Production environments requiring poka-yoke fastening control

When Should You Use This?

Use FG preset torque screwdrivers when:

Torque must remain fixed and repeatable
Multiple operators need consistent fastening results
Fasteners are repeatedly assembled to the same torque
Over-tightening could damage components or threads
Process control and quality compliance are important
You need a tamper-resistant torque setting

When Should You NOT Use This?

Do not use FG preset screwdrivers when:

Torque values need frequent adjustment → use an adjustable torque screwdriver
Torque traceability or data capture is required → use smart torque systems such as ECT/EPT tools
Very high torque ranges are required → use higher-capacity torque tools or wrenches
Operators need visible external torque adjustment scales

How FG Preset Torque Screwdrivers Work

FG preset screwdrivers use a cam-over clutch mechanism:

Torque builds as the fastener is tightened
Once the preset torque value is reached, the clutch “cams over” or slips
Additional torque is prevented from being applied to the fastener

This design minimizes operator influence, prevents over-tightening, and improves fastening consistency.

Result:

Improved fastening accuracy
Reduced fastener damage
Better process repeatability
Lower operator error rates
Increased assembly quality control

Core Features

Cam-over clutch mechanism for over-torque protection
Internal preset torque adjustment
Tamper-resistant design
Compact ergonomic handle for reduced fatigue
Designed for repetitive assembly applications
Precision torque repeatability
ISO-compliant torque accuracy
Double locking mechanism to prevent accidental torque changes
Available in multiple torque ranges and color labels

Configuration Options

Internal Preset Adjustment

Torque adjusted internally using a hex key
Torque verification performed using a torque analyzer or torque tester
Prevents unauthorized operator adjustments

Factory Preset Options

Tools can be ordered preset to a specified torque value from the factory
Ready for immediate production use upon receipt

Torque Range Variations

Available in multiple inch and ozf.in torque ranges depending on application requirements.

Available Models (FG Preset Torque Screwdrivers)

Inch Models

FG-8i

Torque Range: ~0.8–8 lbf.in

FG-20i

Torque Range: ~2–20 lbf.in

FG-40i

Torque Range: ~4–40 lbf.in

FG-125i

Torque Range: ~12–125 lbf.in

Ozf.in Models

FG-25z

Torque Range: ~3–25 ozf.in

FG-50z

Torque Range: ~10–50 ozf.in

Setup & Adjustment

Option 1: Internal Adjustment

Use the appropriate hex key
Adjust the internal torque mechanism
Verify torque using a torque analyzer or torque tester

Option 2: Factory Preset

Order the tool preset to the required torque value from the factory
Ready for immediate production use upon receipt

FG preset tools do not feature an external adjustment scale.

Can Torque Be Changed Later?

Yes.

The torque can be changed by:

Adjusting the internal mechanism using a hex key and torque analyzer
Sending the tool to a calibration or service lab for adjustment and recalibration

Decision Guide

FG Preset vs Other Torque Tool Options

Use FG Preset when:

Torque settings should remain fixed
Multiple operators perform the same fastening task
Over-torque prevention is required
Assembly consistency is critical

Consider other options when:

Adjustable Screwdriver: Torque changes frequently
Smart Tools (ECT/EPT): Traceability or data collection required
Torque Wrenches: Higher torque applications needed
Mini FG Models: Extremely low micro-torque applications required

Use Cases (Real-World Examples)

1. Medical Device Assembly

Problem: Small fasteners were being damaged due to inconsistent operator torque.

Solution: FG preset tools eliminated torque variation and reduced component failures.

2. Electronics Manufacturing

Problem: Operators were unintentionally over-tightening PCB fasteners.

Solution: Cam-over clutch prevented excessive torque and improved quality consistency.

3. Aerospace Assembly

Problem: Critical fasteners required precise repeatable torque.

Solution: FG preset screwdrivers provided repeatability and process control for production assembly.

4. Production Line Standardization

Problem: Operators adjusted torque settings incorrectly between shifts.

Solution: Internal preset configuration prevented unauthorized torque changes.

Troubleshooting

Issue 1: Torque feels inconsistent

Cause: Tool may be out of calibration.

Solution: Verify torque with analyzer and recalibrate if needed.

Issue 2: Tool slips too early

Cause: Torque set too low or adjustment drift.

Solution: Reset torque using a torque analyzer.

Issue 3: Fasteners are stripping

Cause: Incorrect torque specification for the application.

Solution: Verify engineering torque requirements.

Issue 4: Operator thinks tool is broken

Cause: Operator unfamiliar with cam-over function.

Solution: Train operator that clutch slip indicates target torque reached.

Issue 5: Torque cannot be externally adjusted

Cause: Preset design intentionally prevents external adjustment.

Solution: Use internal adjustment process with proper tools and verification equipment.

Calibration & Standards

FG preset torque screwdrivers are designed to comply with International Organization for Standardization ISO 6789-1:2017 requirements.

Recommended calibration intervals:

ISO guideline: every 5,000 cycles
Or according to internal quality requirements

Mountz references extensive lifecycle testing exceeding ISO minimum requirements.

Integration / Advanced Notes

No PLC or MES integration (manual hand tool)
No torque traceability or data capture
Requires torque analyzer verification for proper setup
Preset design supports poka-yoke error prevention strategies
Proper calibration management is essential for accuracy maintenance

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

FG Preset Torque Screwdrivers – FAQ & User Guide