Spark Plug Thread Repair Kit M14 x 1.25 with HSS Tap and 4 Threaded Inserts

Brief Overview

This spark plug thread repair kit addresses one of the most common engine head failures in automotive service—stripped or damaged spark plug threads. Rather than recommending cylinder head replacement, you can now offer your customers a cost-effective repair solution that restores proper thread integrity in minutes. The kit includes a precision HSS cutting tap and four threaded inserts in varying depths, allowing you to match the repair to the exact damage profile. For shops working with multiple engine types, consider pairing this with glow plug thread repair options to cover diesel and alternative fuel applications.

Key Features

• HSS Cutting Tap (M14 x 1.25): Precision-ground fluted design with 65 mm length and 14 mm hex shank for reliable engagement in power tools or hand wrenches
• Four Threaded Inserts: M12 x 1.25 metric inserts in graduated lengths (9.5 mm, 11.5 mm, 12.7 mm, 19 mm) to accommodate varying damage depths
• Black Oxide Finish: Hard-wearing surface treatment protects against corrosion during storage and repeated use
• Internal Threads Pre-Cut: Inserts arrive ready to install—no additional machining required
• External Ribbed Design: Stepped exterior surface ensures secure seating and prevents rotation once installed

Why This Kit Works for Your Shop

Margin Opportunity: Thread repair kits command premium pricing compared to their material cost. A single successful spark plug thread restoration justifies the kit investment through markup alone.

Customer Retention: Instead of turning away cylinder head repairs, you now retain jobs that would otherwise go to machine shops or require engine rebuilds. This expands your service capability and repeat business.

Quick Turnaround: Tap cutting and insert installation takes 10–15 minutes per hole. You can often complete repairs same-day, improving customer satisfaction and shop throughput.

Inventory Efficiency: One universal M14 x 1.25 kit covers the most common spark plug thread size across gasoline engines. The four insert depths eliminate guesswork about damage severity.

Technical Specifications

Specification	Detail
Tap Size	M14 x 1.25
Tap Material	High-Speed Steel (HSS)
Tap Length	65 mm
Tap Shank	14 mm hex for power tool or wrench engagement
Insert Size	M12 x 1.25
Number of Inserts	4 pieces
Insert Depths	9.5 mm, 11.5 mm, 12.7 mm, 19 mm
Coating	Black oxide finish
Application	Gasoline engine spark plug thread repair

What Resellers Should Know

This kit is engineered for single-use efficiency—one tap per job, multiple insert options per kit. Stock it alongside oil drain plug thread repair sets to build a complete thread-rescue product line. Mechanics appreciate kits with graduated insert sizes because they reduce frustration when assessing damage depth in real time.

The HSS tap is hardened for repeated use across multiple cylinders, and the insert quality ensures lasting grip on the spark plug electrodes without loosening over engine life cycles.

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Ready to add professional thread repair capability to your inventory? Order in bulk and establish yourself as the go-to supplier for engine head restoration.