N-105-724-03 Genuine VW/Audi Internal 12-Point Socket Bolt - M8 x 16

Genuine VW/Audi internal 12-point socket bolt, part number N-105-724-03. This original M8 x 16 fastener is used at specified mounting positions, including the high-pressure fuel pump attachment on the A4 configurations below and the separately identified turbocharger cover plate attachment.

Technical details

• Original number: N-105-724-03 / N10572403.
• Published nominal size: M8 x 16.
• Internal 12-point socket drive, as shown in the original photographs.
• Cataloged earlier number: N01473910.
• One bolt supplied. Pump, cover plate, seals and other mounting hardware are separate.

Each mounting position has its own service requirements. At the fuel pump, the assigned hardware retains the pump in its factory mounting arrangement. At the cover plate, this bolt retains the specified protective component. The table distinguishes these uses so the bolt can be matched to the actual repair.

This fastener is not a fuel seal or a replacement pump component. A matching M8 thread alone does not establish compatibility; length, head form and assigned mounting position must also match.

Common reasons to replace

Replace a missing bolt, damaged threads, a rounded drive recess, deformation or corrosion that affects reliable assembly. Renew hardware after removal whenever the applicable factory procedure requires replacement.

Fuel pump removal or cover plate service can expose prior tool damage, an incorrect substitute bolt or damaged mating threads. Inspect the associated component and contact area before installing replacement hardware.

A fuel pressure fault requires diagnosing the pump, drive arrangement, electrical controls and fuel delivery system. A new mounting bolt cannot repair an internally worn pump or damaged separate seal. Likewise, a loose heat shield can involve a damaged plate or mounting point that also needs repair.

Installation and service notes

Identify the exact mounting position and original number before ordering. Follow the procedure for that assembly rather than transferring tightening instructions between the pump and cover plate applications.

For high-pressure fuel pump service, depressurize the system and prepare the components according to factory instructions before disconnecting anything. Inspect the pump mounting arrangement and renew separate seals when required by the repair procedure.

Align the component correctly and start the bolt by hand in undamaged mating threads. Use a correctly fitting internal 12-point driver fully engaged in the recess. Other drive types can damage the fastener.

Use the prescribed tightening sequence, torque and any required additional angle for the actual connection. Do not infer torque from the M8 x 16 designation. Follow the specified hardware renewal and thread preparation requirements.

If the bolt binds or the component does not seat normally, check the alignment, original part selection and mating threads before proceeding. Complete the required leak, clearance and functional checks for the serviced assembly.

This listing supplies one dry original fastener. It contains no fuel, pump or complete installation kit. Order other components and the repair quantity separately according to the actual assembly.

Fitment

Confirm the original bolt number and exact pump or cover plate attachment before ordering. One bolt supplied.