Factors Affecting Tighten ing Torque

The tightening torque is affected by a wide variety of factors including the followings. After tightening, always check the torque with a torque wrench.

1)Voltage

When the battery pack becomes near- ly discharged, the voltage decreases and the tightening torque drops.

Bolt Tightening Conditions

Tightening conditions

•The following bolts are used. Standard bolts: Strength type 4.8 High tensile type 12.9

Explanation of the strength type 4.8

Bolt yield point

(80% of tensile strength)

32 kgf/mm2 (45000psi)

Bolt tensile strength

40 kgf/mm2 (56000psi)

2) Tightening time

Longer tightening time results in increased

Tightening torque

N·m (kgf-cm)

196.0

(2000)

147.0

(1500)

98.0

(1000)

49.0

(500)

M10×35 mm M12, M14, M16 ×45 mm Standard bolt

M16

M14

M12

M10

	tightening torque. Excessive tightening, how
	ever, adds no value and reduces the life of
	the tool.
3)	Different bolt diameters
	The size of the bolt diameter affects the tight
	ening torque.
	Generally, as the bolt diameter increases,
	tightening torque rises.
4)	Tightening conditions

Tightening torque will vary, even with the same bolt, according to grade, length, and torque coefficient (the fixed coefficient indi cated by the manufacturer upon produc tion).

0.0 0.5 1.0 1.5 2.0 2.5 3.0

Tightening torque will vary, even with the

Tightening torque

N·m (kgf-cm)

196.0

(2000)

147.0

(1500)

98.0

(1000)

49.0

(500)

Tightening time (Sec.)

M8, M10×35 mm M12×45 mm High tensile bolt

M12

M10

same bolting material (e.g. steel), accord ing to the surface finish.

Torque is greatly reduced when the bolt and nut start turning together.

5)Socket play

Torque is lowered as the six-sided configu ration of the socket of the wrong size is used to tighten a bolt.

6)Switch (Variable speed control trigger)

Torque is lowered if the unit is used with the switch not fully depressed.

7)Effect of Connecting Adaptor

The tightening torque will be lowered through the use of a universal joint or a connecting adaptor.

0.00.5 1.0 1.5 2.0 2.5 3.0

Tightening time (Sec.)

BoltWasher

Steel plate thickness10 mm (3/8")

Nut Washer Spring washer

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EY7541 specifications

The Panasonic EY7541 is a versatile and powerful cordless impact wrench designed for professionals and enthusiasts seeking reliability and performance in their tools. With a robust build and advanced technology, this tool stands out in the competitive landscape of power tools, particularly for automotive, construction, and industrial applications.

One of the standout features of the EY7541 is its impressive 18V lithium-ion battery system, which offers extended runtime and quick charging capabilities. This ensures that users can work longer without frequent interruptions, making it ideal for heavy-duty tasks. The tool is equipped with a compact design, lending it the maneuverability required for tight spaces, while still providing substantial torque and power.

The EY7541 boasts a powerful motor that delivers high torque output, making it suitable for driving large bolts and fasteners efficiently. Its dual speed settings allow users to adjust the wrench's performance based on their specific job requirements. The first speed is ideal for precision work or driving smaller screws, while the second speed maximizes the power for tougher applications, ensuring versatility across various tasks.

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In conclusion, the Panasonic EY7541 impact wrench is a reliable tool that integrates power, efficiency, and user-centric features. With its advanced battery technology, variable speed settings, ergonomic design, and durability, it is a top choice for professionals in need of a high-performing impact wrench that can handle a variety of tasks with ease.

Panasonic EY7541 Factors Affecting Tighten ing Torque, Bolt Tightening Conditions

Models: EY7541