d b audiotechnik SI 631 Torque Settings Guideline Instructions

: May 15, 2024
: d b audiotechnik

Table of Contents

d b audiotechnik SI 631 Torque Settings Guideline
Product Specifications
Product Usage Instructions
Introduction
Conversion factors
Torque chart
References
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Download This Manual (PDF format)

d b audiotechnik SI 631 Torque Settings Guideline

d-b-audiotechnik-Torque-Settings-Guideline-PRODUCT

Product Specifications

Product Name: SI 631 Torque settings guideline 1.0 en
Manufacturer: d&b
Compatibility: Various screws commonly used with d&b products

Product Usage Instructions

Introduction

Specifying correct torque values for fasteners depends on various parameters affecting the desired result, such as material type and strength, insertion depth, hole diameter, tools used, tightening speed, and more.

Torque Chart

In this guideline, the assumption is made that the tightening torque is applied smoothly and slowly until the full torque is reached, using new screws with standard finish and no lubrication.
Always refer to exploded view drawings for product-specified torque values.

Fastener Types and Torque Values

Fastener Type| Drive Type| Thread Size Grade/Class| Torque Values (SI unit/Imperial unit)
---|---|---|---
Machine screw| TORX T20| M3 SPAX 4×15|

Usage/Remarks

Note: The torque values provided may not consider specific tightening sequences, additional mounting specifications, or the use of thread-locking fluid on certain fasteners.

Frequently Asked Questions (FAQ)

Q: Can I use lubricated screws with this product?

A: The guideline assumes screws are not lubricated. Always follow manufacturer recommendations for lubrication.

Q: How can I convert torque units?

A: You can use calculation tools available on websites like Norbar Torque Tools Ltd.’s Torque Unit Converter or other manufacturers’ websites.

This Service Information (SI) provides basic knowledge of fastener tightening specifications and lists general torque values for various screws commonly used with d&b products.

Introduction

Specifying correct torque values for fasteners depends on many parameters that affect the desired result.
These include, for example, the type of material and its strength, the required insertion depth (material thickness), the hole diameter, the used tools, the tightening speed, the surface treatment, the effect of the mating surfaces or even human error.

Generic information on tightening fasteners

The quality of a screw joint is significantly affected by the tightening process.
A joint tightened by hand behaves completely differently from one tightened using a power tool.
Different types of tools also have a decisive influence on the result.
Overtightening can overstress the fastener or part and damage threads.
Damage to the thread leads to an increased resistance when turning the screw so that the specified torque is reached before the correct clamping force is achieved.
Insufficient torque may allow movement between parts, which can cause premature failures or loosening of fasteners.
The International System of Units (SI)

Denotation of units

Torque can be specified in various measurement systems. The most widely accepted system worldwide is the International System of Units (SI) with the unit newton meter (N·m). The Imperial and US customary measurement systems are also commonly used.
The proper way to express torque in these systems is pound-force foot (lbf·ft) or pound-foot (lb·ft).
Note: In common practice, however, numerous specifications incorrectly express torque as foot-pound, denoted as ft·lb, or inch-pound, denoted as in·lb.
To ensure compatibility and precision of torque measurements, it is important to convert units accurately.

Conversion factors

Pound-force foot ⇒ Newton meter

To convert pound-foots (lb·ft) to Newton meters (N·m), multiply by 1.356
1 N·m ≈ 0.737 lb·ft

Pound-force inch ⇒ Newton meter

To convert inch-pounds (lb·in) to Newton meters (N·m), multiply by 0.113
1 N·m ≈ 8.851 lb·in
Note: For your convenience, you can also use calculation tools for converting torque units, which you can find on the websites of various manufacturers e.g.: the Torque Unit Converter of Norbar Torque Tools Ltd.

Torque chart

In preparing this guideline, the following basic assumptions have been made:

The tightening torque is achieved smoothly and slowly until the torque tool indicates that the full torque has been reached. Screws are new, standard finish and not lubricated.
Only tools and test equipment suitable for the task at hand are used.
No worn or damaged tools are used.
Some torque values can only be determined by testing with actual parts under actual fastening and assembly conditions.
For this reason, our technical documentation does not contain specific torque values for every screw connection.
Always check the exploded view drawings available on Backstage first for available product-specified torque values.

Fastener type| Drive Type| Thread size Grade/Class| Torque values SI unit (Imperial unit)| Usage/Remarks
---|---|---|---|---
Construction screw| TORX T20| SPAX 4×15| 1.5 N·m (13.3 in·lb)| Crossover, Distribution board
Machine screw| TORX T10| M3| 1.0 N·m (8.85 in·lb)| Housing cover amplifiers
Machine screw| TORX T20| M4x20| 4.0 N·m (35.4 in·lb)| Rigging parts
Machine screw| TORX T25| M5x18/20| 3.0 N·m (26.6 in·lb)| Driver mounting
Machine screw| TORX T25| M5x25/30| 6.0 N·m (53.1 in·lb)| Pole mount socket, Driver mounting
Machine screw| TORX T25| M5x35| Slightly countersunk only| J Cover plate
Machine screw| TORX T25| M5x35| 3.0 N·m (26.6 in·lb)| MF Driver mounting (GSL/KSL)
Machine screw| TORX T25| M5x35| 5.0 N·m (44.3 in·lb)| Front grill mounting
Machine screw| TORX T30| M6x20| 8.0 N·m (70.8 in·lb)| Rigging components
Machine screw| TORX T30| M6x30/35| 10.0 N·m (88.5 in·lb)| Driver mounting, Threaded flange,

Rigging components

Notes: The torque values quoted in the chart above do not consider the following points
A required specific (e.g. criss-cross) tightening sequence of the screws.
Additional mounting specifications e.g. “first tighten only slightly, then retighten to the final torque”.
The use of thread-locking fluid on certain fasteners.
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Trademarks

TORX®, and TORX PLUS® are registered trademarks of Acument Intellectual Properties, LLC. Torxproducts.com.
PT®, DELTA PT®, and Cell PT® are registered trademarks of EJOT Holding GmbH & Co. KG.
SPAX® is a registered trademark of SPAX International GmbH & Co. KG.
Other company, product, or service names used herein are for identification purposes only and might be trademarks or service marks of their respective companies.