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Assembly Torque Specifications
The Torque Specifications apply to all internal and external fasteners in sizes 4.0, 5.0 and 6.0 mm in general at
ISO 4762 Screw class 8.8. The torque specifications are also generally classified as soft-jointed and are listed
according to size and placement in the machine.
1. 4 mm Allen socket head cap screws, Class 8.8 @ 2.5 Nm (uses 3 mm Allen tool)
• Head-frame, bearing retainers, front cover small
2. 4 mm Allen set screw, class 8.8 @ 1.2 Nm (uses 2.0 mm Allen tool)
• Tension assembly, 3 hole thread guide, motor pulley, hook
3. 5 mm Allen socket head cap screw class 8.8@ 5.6 Nm (uses 4 mm Allen tool)
• Front cover large
• Belt tensioner
• Drive-train bracket
4. 5 mm Allen set screw, Class 8.8 @ 2.4 Nm (uses 2.5 mm Allen tool)
• Main shaft timing pulley, hook-shaft timing pulley
• Main shaft timing collar, hook-shaft timing collar
5. 6 mm Allen socket-head cap screws Class 8.8 @ 9.9 Nm. (Uses 5 mm Allen tool)
An exception must be observed here since the screws are considered soft-jointed and shallow-threaded and
are used externally. It is therefore advised that this torque specification not exceed 6 Nm.
• Base plates
• Handlebars
6. 6 mm Allen set screw, Class 8.8@ 4.5 Nm (Uses a 3 mm Allen tool)
• Hand wheel
Page 4
Baby Lock Crown Jewel Service Manual
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