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Torque Unit Converter
User Guide for dandb audiotechnik models including: SI 631, SI 631 4S Loudspeaker, 4S Loudspeaker, Loudspeaker
15 ore fa — Specifying correct torque values for fasteners depends on many parameters that affect the desired result. These include, for.
Rigging components (GSL/KSL/XSL). Machine screw. TORX T40. M8x31. 18.0 N·m (159.3 in·lb). Rigging components (J). Screw/washer assy. TORX T20. M4x8. 2.0 N·m ( ...
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DocumentDocumentD6674.INT.01, 04/2025, © d&b audiotechnik GmbH & Co. KG SI 631 Torque settings guideline 1.1 en 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, there are numerous specifications that incorrectly express torque as foot-pound, denoted as ft·lb or inch-pound, denoted as in·lb. Conversion factors To ensure compatibility and precision of torque measurements, it is important to convert units accurately. 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.. www.dbaudio.com, service@dbaudio.com dbr SI 631 Torque settings guideline 1.1 en D6674.INT.01, 04/2025, © d&b audiotechnik GmbH & Co. KG 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. First check the technical documentation on Backstage , i.e. the available exploded view drawings, to determine whether product-specific torque data is available. Fastener type Drive type Construction screw Machine screw Machine screw Machine screw Machine screw Machine screw Machine screw Machine screw Machine screw Machine screw TORX T20 TORX T10 TORX T20 TORX T25 TORX T25 TORX T25 TORX T25 TORX T25 TORX T30 TORX T30 Thread size Grade/Class SPAX 4x15 M3 M4x20 M5x18/20 M5x25/30 M5x35 M5x35 M5x35 M6x20 M6x30/35 Torque values SI unit (Imperial unit) 1.5 N·m (13.3 in·lb) 1.0 N·m (8.85 in·lb) 4.0 N·m (35.4 in·lb) 3.0 N·m (26.6 in·lb) 6.0 N·m (53.1 in·lb) Slightly countersunk only 3.0 N·m (26.6 in·lb) 5.0 N·m (44.3 in·lb) 8.0 N·m (70.8 in·lb) 10.0 N·m (88.5 in·lb) Machine screw Machine screw Screw/washer assy. Screw + washer Screw + washer Self-tapping screw Self-tapping screw Self-tapping screw Self-tapping screw TORX T40 TORX T40 TORX T20 TORX T25 TORX T25 TORX T10 TORX T10 TORX PLUS T20IP TORX PLUS T20IP M8x31/35 M8x31 M4x8 M5x35 M5x35 PT K 30x10 PT K 35x10/16 DELTA PT 40x14 Cell PT 45x20 12.0 N·m (106.2 in·lb) 18.0 N·m (159.3 in·lb) 2.0 N·m (17.7 in·lb) 2.5 N·m (22.1 in·lb) 4.0 N·m (35.4 in·lb) 0.4 N·m (3.5 in·lb) 1.2 N·m (10.6 in·lb) 1.5 N·m (13.3 in·lb) 3.0 N·m (26.6 in·lb) Serrated flange hex HX AF13 head bolt M8x20 8.8 (DIN EN 1665) 18.0 N·m (159.3 in·lb) Usage/Remarks Crossover, Distribution board Housing cover amplifiers Rigging parts Driver mounting Pole mount socket, Driver mounting J Cover plate MF Driver mounting (GSL/KSL) Front grill mounting Rigging components Driver mounting, Threaded flange, Rigging components Rigging components (GSL/KSL/XSL) Rigging components (J) PCB mounting amplifiers Horn mounting (M4 monitor) Horn mounting (M2 monitor) Direct fastening into thermoplastics Direct fastening into thermoplastics Direct fastening into thermoplastics Direct fastening into cellular foamed thermoplastics (XSL) Swivel caster mounting (Subwoofers) Notes: 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. www.dbaudio.com, service@dbaudio.com dbr D6674.INT.01, 04/2025, © d&b audiotechnik GmbH & Co. KG SI 631 Torque settings guideline 1.1 en Trademarks TORX®, 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. www.dbaudio.com, service@dbaudio.com dbr