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TIME-SERT Big Sert 51457 Replacement Insert Fully Threaded M14x1.25

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  • TIME-SERT Big Sert 51457 Replacement Insert Fully Threaded M14x1.25
  • TIME-SERT 51459 Big Sert insert from showing outside measurement.
Now: $13.74
Was: $20.00


TIME-SERT 51457 14x1.25 Tapered Seat Over Size Steel Insert with 16.8mm reach - considered 3/4" reach. 51457 is fully threaded, unlike the 51459. It is made for spark plugs that have threads on the length of the plug that sits in the insert.  *Note, requires the Time Sert 51484A setting ring tool to be used on setting tool or thread damage may occur when installing. 


*Loctite sealer is required for ALL taper seat inserts. Use of PN 6020 is recommended.

Question - Why is there a chunk missing out of the side of the insert?

Answer - The piece missing is NOT a defect. Time-Sert calls this part of the insert the "socket with metal locking pin". It is an engineered locking design. Once the insert is installed with the driver, the locking pin is pushed out and locks the insert into place. This creates a "cam lock" which helps to insure the insert will NOT back out. 

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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3 Reviews

  • 5

    Time Sert

    Posted by C.W.Pence Rebuilders on 1st Feb 2023

    Great product . We use it often on repairs.

  • 5

    Great product for a Ford design flaw.

    Posted by Mike M on 25th Aug 2019

    I've been wrenching for 30 years and this was the first time I've had to perform this repair. It was straight forward. The instructions combined with the YouTube video was all anyone should need. Very effective process and technique. I did not grease the flutes, I opted for vacuum with air compression after each stage with a post bore-scope inspection.

  • 5

    Time-Sert 5553 Thread Repair Kit

    Posted by David F. on 22nd Apr 2016

    I used this tool to repair my 2002 Ford F150 with 5.4 liter Triton engine. Although not inexpensive, this tooling is high quality and gave me confidence that the repair would be a long term fix. I currently have almost 1000 miles on the repair (blown spark plug on cylinder #7) and so far no problems. Dennis at Wise Auto Tools was very helpful and his videos on these tools were a very decisive factor in choosing this kit.

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