Flex Power In-Line Pulse Tools

Quick Answer

The Flex Power In-Line Pulse Tools are pneumatic pulse tools designed for medium- to high-torque production fastening applications. Featuring pulse technology, low reaction force, an excellent power-to-weight ratio, and both automatic shut-off and non shut-off models, the Flex Power Series improves operator comfort while delivering fast, repeatable fastening performance.

Who This Is For

Manufacturing engineers
Process engineers
Quality engineers
Assembly operators
Automotive manufacturers
Heavy equipment manufacturers
Aerospace manufacturers
General industrial assembly facilities

When Should You Use This?

Use Flex Power In-Line Pulse Tools when:

Medium- to high-torque fastening is required
High-speed production is important
Reducing operator fatigue is a priority
Low torque reaction is desired
Impact wrench vibration should be minimized
Pneumatic fastening is preferred

When Should You NOT Use This?

Flex Power In-Line Pulse Tools may not be the best choice when:

Programmable fastening is required
Torque-angle monitoring or traceability is needed
Very low torque precision fastening is required
Cordless operation is preferred
Electric fastening systems are required

For programmable fastening, consider the Mountz ECT-Series, HD-Series, or YF-Series.

How Flex Power Pulse Tools Work

Flex Power Pulse Tools use compressed air to drive a hydraulic pulse mechanism that delivers torque in short, controlled pulses.

During operation, the tool:

Uses compressed air to power the motor.
Transfers energy through specially formulated pulse fluid.
Delivers torque through hydraulic pulses rather than continuous impact.
Automatically shuts off (Auto Shut-Off models) or continues running (Non Shut-Off models) depending on the selected configuration.
Minimizes vibration and reaction force compared to traditional impact wrenches.

Result:

Fast rundown speeds
Repeatable torque output
Reduced operator fatigue
Lower vibration
Improved ergonomics

Core Features

Hydraulic pulse fastening technology
Available in Auto Shut-Off and Non Shut-Off models
High-speed rundown
Excellent power-to-weight ratio
Low noise operation
Minimal vibration
Reaction-free operation
Comfortable rubberized non-slip grip
Special pulse fluid extends service intervals
Double sealing reduces maintenance requirements
Wide range of torque capacities
Available with 1/4" female hex and 3/8" square drive outputs

Configuration Options

Configuration	Best For
Auto Shut-Off	Repeatable production fastening
Non Shut-Off	Operator-controlled fastening
1/4" Female Hex	Screwdriving applications
3/8" Square Drive	Nutrunner and socket applications

Available Models

The Flex Power In-Line Series includes both Auto Shut-Off and Non Shut-Off pulse tools covering torque ranges from 4.4 to 34.6 lbf.ft (6–47 N·m). Models are available with either 1/4" female hex or 3/8" square drive outputs.

Flex Power In-Line Model Chart

Auto Shut-Off Model	Non Shut-Off Model	Item Numbers	Drive Type	Torque Range	Free Speed
FLEXS-30SX	FLEX-30SX	360122 / 360130	1/4" Female Hex	4.4–9.2 lbf.ft (6–12.5 N·m)	4200 RPM
FLEXS-40SX	FLEX-40SX	360123 / 360131	1/4" Female Hex	7.4–13.2 lbf.ft (10–18 N·m)	4200 RPM
FLEXS-40S	FLEX-40S	360124 / 360132	3/8" Square Drive	8.1–14 lbf.ft (11–19 N·m)	4200 RPM
FLEXS-50SX	FLEX-50SX	360125 / 360133	1/4" Female Hex	10.3–19.1 lbf.ft (14–26 N·m)	7200 RPM
FLEXS-50S	FLEX-50S	360126 / 360134	3/8" Square Drive	11.1–19.9 lbf.ft (15–27 N·m)	7200 RPM
FLEXS-60SX	FLEX-60SX	360127 / 360135	1/4" Female Hex	14.8–22.1 lbf.ft (20–30 N·m)	6000 RPM
FLEXS-60S	FLEX-60S	360128 / 360136	3/8" Square Drive	16.2–25.8 lbf.ft (22–35 N·m)	6000 RPM
FLEXS-70S	FLEX-70S	360129 / 360137	3/8" Square Drive	22.8–34.6 lbf.ft (31–47 N·m)	5000 RPM

Specifications are based on the Flex Power In-Line Pulse Tool Product Bulletin.

Model Selection Guide

If you need:	Recommended Model
Lowest torque applications	FLEX-30SX / FLEXS-30SX
General production fastening	FLEX-40 Series
Medium-torque applications	FLEX-50 Series
Higher torque fastening	FLEX-60 Series
Maximum torque capacity	FLEX-70S / FLEXS-70S
Automatic torque shut-off	FLEXS models
Operator-controlled fastening	FLEX models
Socket applications	3/8" Square Drive models
Screwdriving applications	1/4" Female Hex models

Compatible Accessories

Accessory	Purpose
Air Filter, Regulator & Lubricator (FRL)	Provides clean, regulated compressed air
1/4" Hex Bits	Screwdriving applications
3/8" Drive Sockets	Nutrunner applications
Torque Analyzer	Verifies tool torque output
Digital Torque Wrench	Joint validation and verification

Setup & Adjustment

Connect the tool to a clean, dry, regulated compressed air supply.
Maintain a recommended operating pressure of 85 PSI.
Install the appropriate driver bit or socket.
Adjust the tool to the required torque setting.
Verify torque output using a calibrated torque analyzer before production.
Validate torque on the actual application joint, as extensions, adapters, joint conditions, and air pressure can affect final torque.
Periodically verify torque as part of your quality control program.

Common Applications

The Flex Power In-Line Pulse Tools are commonly used in:

Automotive assembly
Heavy equipment manufacturing
Aerospace assembly
Truck and commercial vehicle assembly
Industrial equipment manufacturing
General industrial production
High-volume fastening applications
Medium- to high-torque assembly operations

Use Cases (Real-World Examples)

Automotive Assembly

Problem: Operators require high-speed fastening while minimizing fatigue from torque reaction and vibration.

Solution: Flex Power Pulse Tools use hydraulic pulse technology to deliver fast rundown speeds with minimal reaction force and vibration, improving operator comfort during repetitive assembly.

High-Volume Production

Problem: Continuous production environments demand fastening tools that deliver consistent torque while reducing maintenance.

Solution: The specially formulated pulse fluid and double-sealing system extend service intervals and improve long-term reliability in continuous-duty applications.

Heavy-Duty Fastening

Problem: Production applications require higher torque than conventional screwdrivers while maintaining operator comfort.

Solution: Flex Power models provide torque capacities up to 34.6 lbf.ft (47 N·m) with an excellent power-to-weight ratio and reduced torque reaction.

Socket and Screwdriving Applications

Problem: Different fastening applications require different drive styles.

Solution: The Flex Power Series is available with both 1/4" female hex and 3/8" square drive outputs, allowing the same product family to support screwdriving and socket fastening applications.

Maintenance

Verify torque output regularly using a calibrated torque analyzer.
Inspect the drive spindle, anvil, and bit or socket for wear or damage.
Use clean, dry, regulated compressed air maintained at the recommended 85 PSI.
Install a high-quality air filter, regulator, and lubricator (FRL) to help remove moisture and debris from the air supply.
Inspect air hoses and fittings for leaks or damage.
Periodically check pulse tool performance and service the pulse mechanism according to the recommended maintenance schedule.
Validate torque on the actual joint whenever tooling, extensions, sockets, or air pressure conditions change.