Prothread - 14.00 x 1.25 Solid Knurled Inserts | 3599-14125X1/2P

ProThread 14.00 x 1.25 Solid Knurled Inserts | 3599-14125X1/2P

The ProThread 3599-14125X1/2P Solid Knurled Inserts are specially engineered solid carbon inserts designed for repairing damaged spark plug threads in aluminium and cast iron applications. Featuring a knurled external design for a secure mechanical lock, these inserts provide a strong and permanent repair solution for workshop and engine maintenance applications.

► Key Features

• Designed for M14 x 1.25 spark plug thread repair applications
• Solid knurled insert design provides secure mechanical locking
• No drilling required — simply tap and install
• Suitable for aluminium and cast iron applications
• Ideal for taper and gasket seat spark plug ports
• Engineered for permanent and reliable thread restoration

► Technical Specifications

• Type: Solid Knurled Spark Plug Insert
• Thread Size: M14 x 1.25
• Insert Length: 1/2"
• Thread Style: Metric Fine
• Insert Quantity: 5
• Internal Thread Diameter: 14mm
• Pitch: 1.25mm
• Application: Spark Plug Thread Repair
• Suitable Materials: Aluminium & Cast Iron
• Material: Solid Carbon Steel
• Brand: ProThread
• Sub Brand: Plug Fix
• Part No.: 3599-14125X1/2P

► Why Tradies Grab This

Perfect for repairing stripped or damaged spark plug threads without major rework. The solid knurled design delivers a strong mechanical lock that helps keep inserts secure under high heat and vibration conditions common in automotive engine applications.

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• We Stand By Our Gear: Quality tools and inserts built for dependable trade performance.
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