---
product_id: 20734489
title: "Big-SERT M14x1.25x16.8mm TAPERSEAT Insert Qty 2# 51457"
brand: "time-sert"
price: "FREE"
currency: TND
in_stock: false
reviews_count: 8
url: https://www.desertcart.tn/products/20734489-big-sert-m14x1-25x16-8mm-taperseat-insert-qty-2-51457
store_origin: TN
region: Tunisia
---

# M14x1.25 precision thread Truck-grade heavy-duty repair 16.8mm taper seat depth Big-SERT M14x1.25x16.8mm TAPERSEAT Insert Qty 2# 51457

**Brand:** time-sert
**Price:** FREE
**Availability:** ❌ Out of Stock

## Summary

> 🔧 Fix it right, fix it once — the pro’s oversized spark plug insert!

## Quick Answers

- **What is this?** Big-SERT M14x1.25x16.8mm TAPERSEAT Insert Qty 2# 51457 by time-sert
- **How much does it cost?** FREE with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/20734489-big-sert-m14x1-25x16-8mm-taperseat-insert-qty-2-51457)

## Best For

- time-sert enthusiasts

## Why This Product

- Trusted time-sert brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Precision Fit:** M14x1.25 thread ensures seamless, professional-grade installation.
- • **Heavy-Duty Material:** Zinc-coated copper core insert built to withstand truck-level stress and heat.
- • **Tapered Seat Design:** 16.8mm taper seat guarantees optimal spark plug alignment and sealing.
- • **Oversized Durability:** Engineered for coil thread failure recovery—no more compromises.
- • **Complete Repair Solution:** Requires Time-Sert kit (5141S or 5141E) for flawless, long-lasting results.

## Overview

The Big-SERT M14x1.25x16.8mm Taper Seat Insert by Time-Sert is a premium oversized spark plug repair solution designed for heavy-duty truck applications. Featuring a zinc-coated copper core and precision M14x1.25 threading, it restores damaged coil threads with a durable 16.8mm taper seat insert. Sold in pairs, it requires the Time-Sert installation kit (5141S or 5141E) to ensure a professional, long-lasting repair.

## Description

BIG-SERT OVERSIZED REPAIR for use when a coil style insert has failed. M14x1.25x16.8mm Taper seat spark plug insert. Professional repair insert for a high quality repair. Solid bushing oversized spark plug insert. must have kit p/n 5141S or 5141E to install. for ( 5141E kit search B00JDO801K) for ( 5141S kit search B00IXP1MBU ) Special Note: This insert is also used in Triple oversized Time-Sert kit p/n 5600

Review: Expensive (especially the install kits) but permanent repair - These work great. They create a new thread where the original has been damaged. Especially good for spark plug thread repair. The installation kits are very expensive but cheaper than paying someone to replace the head (or to do it yourself on many cars). Most jobs can be done with the head in place.
Review: Big sert - Just what I needed

## Features

- BIG-SERT OVERSIZED REPAIR for use when a coil style has failed
- M14x1.25x16.8mm Taper seat spark plug insert
- Must have kit p/n 5141S or 5141E to install. see description below
- Solid bushing oversized spark plug insert
- Professional repair insert for a high quality repair

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00JTITL7W |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #976,479 in Automotive ( See Top 100 in Automotive ) #311 in Thread Metric Inserts & Repair Kits |
| Brand | TIME-SERT |
| Brand Name | TIME-SERT |
| Compatible with Vehicle Type | Truck |
| Core Material | Copper |
| Customer Reviews | 4.8 out of 5 stars 62 Reviews |
| Gap Size | 1.25 millimeters |
| Manufacturer | Time-Sert® |
| Manufacturer Part Number | 51457 |
| Model Number | 51457 |
| Number of Items | 2 |
| Thread Size | 14 |
| Top Material Type | Copper |
| UPC | 845617006539 |
| Unit Count | 14 Count |
| Vehicle Service Type | Truck |

## Product Details

- **Brand:** TIME-SERT
- **Core Material:** Copper
- **Gap Size:** 1.25 Millimeters
- **Thread Size:** 14
- **Vehicle Service Type:** Truck

## Images

![Big-SERT M14x1.25x16.8mm TAPERSEAT Insert Qty 2# 51457 - Image 1](https://m.media-amazon.com/images/I/515e-kZ8EwL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Expensive (especially the install kits) but permanent repair
*by 8***E on September 16, 2019*

These work great. They create a new thread where the original has been damaged. Especially good for spark plug thread repair. The installation kits are very expensive but cheaper than paying someone to replace the head (or to do it yourself on many cars). Most jobs can be done with the head in place.

### ⭐⭐⭐⭐⭐ Big sert
*by S***S on March 11, 2026*

Just what I needed

### ⭐⭐⭐⭐⭐ Easy to use and add the thread lock
*by D***L on April 19, 2021*

easy to use worked great on my project thank you

## Frequently Bought Together

- Big-SERT M14x1.25x16.8mm TAPERSEAT Insert Qty 2# 51457
- BIG-SERT M14x1.25x16.8mm INSERT QTY 2# 51407

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**Shop now:** [https://www.desertcart.tn/products/20734489-big-sert-m14x1-25x16-8mm-taperseat-insert-qty-2-51457](https://www.desertcart.tn/products/20734489-big-sert-m14x1-25x16-8mm-taperseat-insert-qty-2-51457)

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-08-29*