Spark Plug Thread Repair Kit M14 x 1.25 with Tap and Installation Tools

Brief Overview

This comprehensive spark plug thread repair kit addresses one of the most common cylinder head failures in automotive service — stripped spark plug threads. The kit includes everything needed to restore damaged threads in a single job: a precision M16 x 1.25 x 70L tap, 15 threaded inserts in two critical lengths, and dedicated installation tools. For shops handling engine rebuilds, warranty work, or high-mileage vehicle repairs, this kit eliminates costly cylinder head replacement. If you service glow plugs as well, complementary solutions like our glow plug re-threading equipment are available to expand your service capabilities.

Key Features

• M16 x 1.25 x 70L Re-Threading Tap: Professional-grade tap with optimal geometry for precise thread creation in aluminum cylinder heads
• Dual-Length Insert Assortment:
  • 5 × M14 x 1.25 inserts (11.2 mm length) — Standard shallow-seated applications
  • 10 × M14 x 1.25 inserts (17.5 mm length) — Deep-seated or retrofit installations
• Mixed Material Inserts: Black-coated steel and brass-colored (likely copper-nickel or similar) coated inserts for corrosion resistance and thermal stability
• Complete Installation Hardware: Tap wrench and dedicated insert driver tool included
• Durable Carrying Case: Molded blue plastic case with integrated hinge and latch; organized recesses prevent tool loss and simplify inventory management

Business Advantages for Resellers

High-Margin Service Offering: Spark plug thread repair commands a premium labor rate ($200–$400+ per cylinder) when performed in-house, with minimal material cost. A single kit enables dozens of repairs, making this a profitable upsell for any engine work.

Customer Retention: Offer customers a cost-effective alternative to cylinder head replacement (often $1500+). This positions your shop as solution-focused and builds customer loyalty for future work.

Inventory Efficiency: The compact carrying case occupies minimal shelf space while supporting multiple repair scenarios. The mixed insert assortment handles the majority of common spark plug thread failures.

Recurring Revenue: Once customers learn you can repair stripped threads, you'll see repeat business. Stock multiple kits to handle seasonal demand (spring/fall tune-ups).

Technical Specifications

Parameter	Specification
Tap Size	M16 x 1.25 x 70L
Insert Type	Helical coil thread inserts
Insert Sizes	M14 x 1.25
Insert Lengths	11.2 mm (5 units) / 17.5 mm (10 units)
Insert Materials	Steel (black-coated) and brass/copper-nickel alloy
Tools Included	Tap wrench, installation driver
Case Material	Durable molded plastic with integrated hinge
Total Insert Count	15 units

Application Context

Ideal for automotive shops servicing:

• Vehicles with high-mileage engines prone to stripped spark plug holes
• Engine rebuilds where cylinder head threads have been compromised
• Warranty work requiring cost-effective solutions to thread damage
• Fleet maintenance where cylinder head replacement is economically unjustifiable

Why This Kit Stands Out

The inclusion of two insert lengths (11.2 mm and 17.5 mm) demonstrates engineering for real-world variability — different spark plug designs and installation depths demand different insert lengths. Rather than forcing a one-size-fits-all approach, this kit gives your technicians options. The mixed material composition (steel + brass/copper) provides thermal cycling resistance critical for the harsh environment around spark plugs.

The precision-ground M16 tap ensures clean thread geometry, reducing the risk of insert misalignment during installation. Combined with the purpose-built installation driver, this minimizes learning curve and reduces installation errors.

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Stock this kit as a cornerstone of your engine service capability. Whether you're servicing spark plugs or performing full engine work, the ability to restore damaged threads in-house is a measurable competitive advantage. Pair with our M12 x 1.0 spark plug repair kit to cover additional engine variants in your customer base.