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Non-reusable Fasteners and Tightening Torques
 
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Pelican Technical Article:

Non-reusable Fasteners and Tightening Torques

Nick Czerula

Time:

1 hours1 hrs

Tab:

$100

Talent:

**

Tools:

Socket set

Applicable Models:

BMW 525i/xi Sedan (2004-07)
BMW 528i xDrive Sedan (2009-10)
BMW 528i/xi Sedan (2008-10)
BMW 530i/xi Sedan (2004-07)
BMW 530xi Wagon (2006-07)
BMW 535i xDrive Sedan/Wagon (2009-10)
BMW 535i/xi Sedan (2008-10)
BMW 535xi Wagon (2008)
BMW 545i Sedan (2004-05)
BMW 550i Sedan (2006-10)
BMW M5 Sedan (2006-10)

Parts Required:

New fasteners dependent on component

Hot Tip:

Always replace aluminum and torque to yield fasteners

Performance Gain:

Proper fastener torque and lifespan

Complementary Modification:

Check to see what fasteners are needed before beginning repair

BMW E60 models utilize fasteners that can only be tightened once. When these fasteners are removed or loosened, they are to be immediately discarded and replaced with new parts. At times, a torque specification for a specific fastener is not provided. In that case, BMW has provided the torque specification depending on bolt size and type. See the table below for standard tightening torques. These torques do not apply to torque-to-yield fasteners. There are different surface colors depending on fastener type. Fasteners may be colored yellow (ZN) or silver (ZNS). The torque values specified in this table apply to noted fastener types only. The following specifications are not applicable when using a different surface or lubricant on the thread, or if the height of the nut differs. The specs are also not applicable to necked-down bolts, self-tapping screw connections or to connections between parts made of different materials.

Size   Type              Grade    Torque Value

M4     Yellow (ZN)    8.8         3 Nm

M4     Silver (ZNS)   8.8         2 Nm

M4     Yellow (ZN)   10.9        4 Nm

M4     Silver (ZNS)  10.9        3 Nm

M4     Yellow (ZN)   12.9        5 Nm

M5     Yellow (ZN)    8.8         6 Nm

M5     Silver (ZNS)   8.8         5 Nm

M5     Yellow (ZN)   10.9        8 Nm

M5     Silver (ZNS)  10.9        7 Nm

M5     Yellow (ZN)   12.9      10 Nm

M5     Silver (ZNS)  12.9        8 Nm

M6     Yellow (ZN)    8.8       10 Nm

M6     Silver (ZNS)   8.8         8 Nm

M6     Yellow (ZN)   10.9     14 Nm

M6     Silver (ZNS)  10.9      12 Nm

M6     Yellow (ZN)   12.9      17 Nm

M6     Silver (ZNS)   12.9     13 Nm

M7     Yellow (ZN)     8.8      15 Nm

M7     Silver (ZNS)    8.8      13 Nm

M7     Yellow (ZN)   10.9     21 Nm

M7     Silver (ZNS)   10.9    19 Nm

M7     Yellow (ZN)    12.9    26 Nm

M7     Silver (ZNS)    12.9    21 Nm

M8     Yellow (ZN)       8.8    24 Nm

M8     Silver (ZNS)     8.8     19 Nm

M8     Yellow (ZN)    10.9    34 Nm

M8     Silver (ZNS)    10.9    28 Nm

M8     Yellow (ZN)     12.9   40 Nm

M8     Silver (ZNS)    12.9    32 Nm

M8x1  Yellow (ZN)     8.8     26 Nm

M8x1  Silver (ZNS)   8.8      21 Nm

M8x1   Yellow (ZN)   10.9    36 Nm

M8x1   Silver (ZNS)  10.9    30 Nm

M8x1   Yellow (ZN)   12.9    44 Nm

M8x1   Silver (ZNS)  12.9    33 Nm

M10    Yellow (ZN)     8.8     47 Nm

M10    Silver (ZNS)    8.8     38 Nm

M10     Yellow (ZN)  10.9     66 Nm

M10     Silver (ZNS)  10.9    56 Nm

M10     Yellow (ZN)   12.9    79 Nm

M10     Silver (ZNS)   12.9   62 Nm

M10x1  Yellow (ZN)    8.8    54 Nm

M10x1  Silver (ZNS)   8.8    41 Nm

M10x1  Yellow (ZN)   10.9   75 Nm

M10x1  Silver (ZNS)  10.9   60 Nm

M10x1  Yellow (ZN)   12.9   91 Nm

M10x1  Silver (ZNS)  12.9   67 Nm

M12     Yellow (ZN)     8.8    82 Nm

M12     Silver (ZNS)    8.8    66 Nm

M12     Yellow (ZN)    10.9  115 Nm

M12     Silver (ZNS)   10.9    98 Nm

M12     Yellow (ZN)     12.9   140 Nm

M12     Silver (ZNS)    12.9   108 Nm

M12x1.5  Yellow (ZN)   8.8     87 Nm

M12x1.5  Silver (ZNS)  8.8     68 Nm

M12x1.5  Yellow (ZN)  10.9  123 Nm

M12x1.5  Silver (ZNS)  10.9  100 Nm

M12x1.5  Yellow (ZN)   12.9  147 Nm

M12x1.5  Silver (ZNS)  12.9  110 Nm

M14      Yellow (ZN)     8.8     130 Nm

M14     Silver (ZNS)     8.8     104 Nm

M14     Yellow (ZN)     10.9    180 Nm

M14     Silver (ZNS)    10.9    155 Nm

M14     Yellow (ZN)     12.9    220 Nm

M14     Silver (ZNS)    12.9    170 Nm

M14x1.5  Yellow (ZN)   8.8   143 Nm

M14x1.5  Silver (ZNS)  8.8    110 Nm

M14x1.5  Yellow (ZN)  10.9   200 Nm

M14x1.5  Silver (ZNS)  10.9  165 Nm

M14x1.5  Yellow (ZN)   12.9  240 Nm

M14x1.5  Silver (ZNS)   12.9 180 Nm

M16     Yellow (ZN)      8.8      200 Nm 

M16     Silver (ZNS)     8.8     160 Nm

M16     Yellow (ZN)     10.9    280 Nm

M16     Silver (ZNS)    10.9    235 Nm

M16     Yellow (ZN)    12.9    340 Nm

M16     Silver (ZNS)    12.9    260 Nm

M16x1.5  Yellow (ZN)   8.8    216 Nm

M16x1.5  Silver (ZNS)  8.8    170 Nm

M16x1.5  Yellow (ZN)  10.9   303 Nm

M16x1.5  Silver (ZNS)  10.9  250 Nm

M16x1.5  Yellow (ZN)   12.9   364 Nm

M16x1.5  Silver (ZNS)  12.9   275 Nm

M18      Yellow (ZN)       8.8     280 Nm

M18      Silver (ZNS)      8.8     225 Nm

M18      Yellow (ZN)     10.9    390 Nm

M18      Silver (ZNS)    10.9    330 Nm

M18      Yellow (ZN)     12.9     470 Nm

M18      Silver (ZNS)    12.9    365 Nm

M18x1.5  Yellow (ZN)   8.8     313 Nm

M18x1.5  Silver (ZNS)  8.8    245 Nm

M18x1.5  Yellow (ZN)  10.9   440 Nm

M18x1.5  Silver (ZNS)  10.9  360 Nm

M18x1.5  Yellow (ZN)   12.9   527 Nm

M18x1.5  Silver (ZNS)  12.9   400 Nm

Self-locking fasteners have a built in locking component and once removed the locking feature is degraded and most times ruined.
Figure 1

Self-locking fasteners have a built in locking component and once removed the locking feature is degraded and most times ruined. The green arrow in this photo points to the self-locking component on the nut. Once tightened, this component is degraded and is no longer secure. You can also damage a bolt if you try to reuse a self-locking fastener, one more very good reason not to try to. Torque to yield bolts are designed to stretch only once when tightened. Therefore, once installed and tightened, they do not return to their previous length like a standard bolt would. Once removed, you cannot trust them to provide a proper fastening torque or a secure clamping force. Torque to yield bolts are known to break if reused. In our tech articles, these bolts will be noted as to be discarded when removed, but always check when ordering parts to be sure we didn't miss one somewhere. Aluminum fasteners are used all over the engine of BMW E60 models and have to be replaced each time they are removed. These bolts can break and you can end up with a corrosion problem if reused, creating a major problem if not noticed immediately.

Some aluminum fasteners have a blue paint mark on them to identify them (green arrow).
Figure 2

Some aluminum fasteners have a blue paint mark on them to identify them (green arrow). However, many fasteners have no identifying mark. It is best to test removed fasteners using a magnet to see if it is made of aluminum.

Aluminum fasteners are sold in sets depending on what repair you are performing.
Figure 3

Aluminum fasteners are sold in sets depending on what repair you are performing. It is a good idea when ordering parts for your vehicle to ask if there is a bolt kit related to your repair. The set of fasteners shown in this photo are required when replacing the water pump, sold as a set. Remember to always make a complete part list and check with our parts specialists to be sure you have everything you need. There is no worse feeling than tearing into a weekend project and not being able to finish the procedure due to not having everything you need.




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Page last updated: Fri 12/9/2016 02:39:57 AM