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TIME-SERT 6250BS Big Sert M10x1.25 Metric Head Bolt Thread Kit

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6250 BS
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6.00 LBS
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  • TIME SERT 6250 BS Metric Head Bolt Thread Kit 10x1.25 Oversize (6250BS)
  • TIME-SERT 6250BS Big Sert M10x1.25 Metric Head Bolt Thread Kit


Includes Free Shipping. The TIME-SERT 6250BS head bolt thread repair kit is a universal head bolt thread kit that can be used on a variety of automobile engines that use the 10 millimeter by 1.25 millimeter bolt size. This is for a "2nd time" repair which means it has had a previous repair done with a Heli Coil or some other competitive brand thread repair kit. If doing a "first time" repair use the Time Sert 6250 standard size kit. Either 6250 or 6250BS will accept the same size M10x1.25 head bolts, the difference is with the OD (Outside Diameter). We have a partial application list below.

The 6250BS is considered a "universal" kit because the tooling has an adjustable stop that can be adjusted to work on holes of different depths. Although, it works on other cars is is mostly used Honda engines. We recommend installing ALL the inserts while the head is off to help eliminate the possibilty threads pulling when installing the head bolts and torquing to the maufacturer's specifications (torque specs). That also eliminates weak links that the remaining aluminum threads would end up being, that could possibly fail shortly after the car is back on the road. Therefore it's recommended to upgrade to the much stronger tensil strength steel, bushing type inserts (part number 50125) that are included in the Time-Sert 6250 head bolt thread repair kit. TIME-SERT is recommended by leading automobile manufacturers. 10 inserts included in each Universal head bolt kit 2 of each size of head alignment dowel (.550 p/n 6255BS and .530 p/n 7588BS). 

Time Sert 6250BS Head Bolt Thread Repair Kit Includes: 

Qty  Item Number Tool

1  - 9216 Drill Fixture

1  - J-42385-307 Drill Bushing 

1  - J-42385-308 Alignment Pin

1  - 31081  Core Drill

1  - 6251 Tap

1  - 6252 Insert Driver 

2  - 6253 Bolts, Short 

2  - 6254 Bolts, Medium 

1  - 7586 Ink Marker, Sharpie

1  - Metal Ruler

1  - 6010 Driver Oil

1  - 6020 Loctite Sealer

2  - 6255BS Alignment Dowels

2  - 7588BS Alignment Dowels

10 - 50125 M10x1.25mm Replacement Big Sert Inserts

pdficon-small.png See the Time-Sert 6250 Thread Repair Kit Instructions pdf - Also see the Youtube video linked above for more tips for a proper repair.

*Note TTY head bolts should be replaced as per service manual. Reusing stretched head bolts can cause repeat thread and/or head gasket failure.

Mercedes, Nissan and Honda Vehicles with M10x1.25mm Head Bolt

Mouse over the images above for a more detailed view of the kit components. Also notice our bulk discount prices on TIME-SERT replacement inserts for thread repair kits. Need more information on TIME-SERT thread repair kits? Visit our auto repair blog section on thread repair kits for tips, advice and all your thread repair questions answered. Just comment and we will be quick to respond.

See the pdficon-small.png TIME-SERT products pdf for more information on thread repair kits and inserts. Some are listed for certain applications on cars, trucks and motorcycles. The pdf is a partial application list so feel free to email or call if we can assist with your particular need. We also accept inquiries regarding our daily TIME-SERT specials. Remember TIME-SERT is recommended by leading car manufacturers like the General Motors Corporation. In fact TIME-SERT is GM's only authorized repair for head bolt threads.

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