Optoelectronic Products BU., UV Project

SP-QR-C-15810-3

14/23

Copyright © 2018 Nichia Corporation. All rights reserved. The information in this document is subject to change without notice.

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Recommended Tightening Torques

Appearance

Thermal Interface Material

Tightening Torque

Result

Thermal Grease

30cN･m (0.30N･m)

No issue

35cN･m (0.35N･m)

No issue

40cN･m (0.40N･m)

No issue

45cN･m (0.45N･m)

No issue

50cN･m (0.50N･m)

No issue

55cN･m (0.55N･m)

No issue

60cN･m (0.60N･m)

No issue

M3 steel pan-head

screw

Material

Strength Grade

Type of Head

Tightening Torque (N m)

M2

M2.6

M3

M4

Steel

4.6

Pan-head

0.12

0.25

0.43

0.98

Stainless steel

A2 - 50

Pan-head

0.11

0.22

0.37

0.87

Brace

ー

Pan-head

0.09

0.18

0.28

0.74

•

Nichia has performed a tightening torque test for the NVCUQ096A/-D4 UV LEDs and confirmed that that there are no

issues with the following conditions:

Recommended screw: M3 steel pan-head screw

Recommended tightening torque range: 0.25 to 0.60N･m

Table 3. Results of a tightening torque test

Note:

15

The tightening torque values are only typical values and are not the specification values for the indicated screws.

•

Cautions/Suggestions:

Use the test results/data presented above for reference purposes only. Nichia strongly recommends performing a

verification to ensure the optimal tightening torque for the chosen application.

◦ If the tightening torque is too low, it may cause issues with heat dissipation.

◦ If the tightening torque is too high, it may cause the ceramic substrate to be damaged.

◦ The optimal tightening torque varies depending on the material of the screw being used.