Prothread - 12 x 1.25 x 1/2", 3/4" Free Running Thread Repair Kit | 3598-12125K

$66.94
$0.00
$66.94
Vendor: Prothread
SKU: 3598-12125K

The ProThread 12 x 1.25 Free Running Thread Repair Kit (3598-12125K) is a professional-grade repair solution designed for restoring damaged spark plug and metric threads in automotive and workshop applications. Featuring multiple insert lengths, this kit delivers strong, wear-resistant threads that outperform...

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ProThread 12 x 1.25 x 1/2", 3/4" Free Running Thread Repair Kit | 3598-12125K

The ProThread 12 x 1.25 Free Running Thread Repair Kit (3598-12125K) is a professional-grade repair solution designed for restoring damaged spark plug and metric threads in automotive and workshop applications. Featuring multiple insert lengths, this kit delivers strong, wear-resistant threads that outperform standard tapped threads in high-temperature and repeated-use environments.

► Key Features

  • Repairs damaged or stripped 12 x 1.25 threads quickly and effectively
  • Includes multiple insert lengths for versatile repair applications
  • Free running stainless steel inserts provide smooth fastener engagement
  • Creates stronger replacement threads with improved wear resistance
  • Corrosion-resistant inserts designed for workshop and automotive environments
  • Ideal for spark plug thread repairs and general metric thread restoration
  • Suitable for aluminium, steel, cast iron, and other metal applications
  • Supplied as a complete repair kit in convenient clam shell packaging

► Technical Specifications

  • Thread Size: 12 x 1.25
  • Thread Type: Free Running
  • Insert Lengths Included: 1/2", 3/4"
  • Insert Quantity: 4 Inserts (2 each size)
  • Insert Material: Stainless Steel
  • Installation Tool Included: HIT15 ProThread Hand Installation Tool
  • STI Tap Included: 12 x 1.25 Chrome Pilot Nose STI Intermediate Tap
  • Application: Spark Plug & Metric Thread Repair
  • Brand: ProThread
  • Part No.: 3598-12125K

► Kit Includes

  • 2 x 12 x 1.25 Stainless Steel 1/2" Inserts
  • 2 x 12 x 1.25 Stainless Steel 3/4" Inserts
  • 1 x Chrome Pilot Nose STI Intermediate Tap
  • 1 x HIT15 Installation Tool

► Why Tradies Grab This

A reliable workshop solution for repairing stripped spark plug and metric threads without replacing costly components. Ideal for mechanics and maintenance crews needing strong, long-lasting repairs that handle repeated assembly and harsh operating conditions.

► Industrial Shed’s Trade Guarantee – Shop with Confidence

  • We Stand By Our Gear: Workshop-grade repair products built for demanding conditions.
  • Loyalty Matters: Trade pricing and account benefits for repeat customers.
  • Real Support, No Runaround: Practical advice from people who understand workshop repairs.
  • Fast Delivery, Every Time: Reliable shipping to minimise downtime.

► Stock won’t last — get yours now at Industrial Shed!

Product weight
1800 g
Material
Stainless Steel
Category
Thread Repair
Shipping calculated at checkout

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Subtotal: $66.94
Product specifications
Category
Thread Repair
Material
Stainless Steel
Product weight
1800 g
Length
12.7 mm
Width
12 mm
Height
0 mm
Diameter
12 mm
Barcode
9.32652E+12
  • On time, every time

    Delivery across Australia, with tracking sent after dispatch. Ordering a large or heavy item? Ask our team to confirm freight costs and delivery arrangements before you buy.

    Delivery information
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    Pay through our secure checkout with the card and express payment options available for your order. Review your items, delivery charges and total before confirming payment.

  • 100% happiness guarantee

    Need help after your purchase? Contact our Somerville team with your order number. We can help with product issues and explain your return options, including conditions and exclusions.

    Returns and support

ProThread 12 x 1.25 x 1/2", 3/4" Free Running Thread Repair Kit | 3598-12125K

The ProThread 12 x 1.25 Free Running Thread Repair Kit (3598-12125K) is a professional-grade repair solution designed for restoring damaged spark plug and metric threads in automotive and workshop applications. Featuring multiple insert lengths, this kit delivers strong, wear-resistant threads that outperform standard tapped threads in high-temperature and repeated-use environments.

► Key Features

  • Repairs damaged or stripped 12 x 1.25 threads quickly and effectively
  • Includes multiple insert lengths for versatile repair applications
  • Free running stainless steel inserts provide smooth fastener engagement
  • Creates stronger replacement threads with improved wear resistance
  • Corrosion-resistant inserts designed for workshop and automotive environments
  • Ideal for spark plug thread repairs and general metric thread restoration
  • Suitable for aluminium, steel, cast iron, and other metal applications
  • Supplied as a complete repair kit in convenient clam shell packaging

► Technical Specifications

  • Thread Size: 12 x 1.25
  • Thread Type: Free Running
  • Insert Lengths Included: 1/2", 3/4"
  • Insert Quantity: 4 Inserts (2 each size)
  • Insert Material: Stainless Steel
  • Installation Tool Included: HIT15 ProThread Hand Installation Tool
  • STI Tap Included: 12 x 1.25 Chrome Pilot Nose STI Intermediate Tap
  • Application: Spark Plug & Metric Thread Repair
  • Brand: ProThread
  • Part No.: 3598-12125K

► Kit Includes

  • 2 x 12 x 1.25 Stainless Steel 1/2" Inserts
  • 2 x 12 x 1.25 Stainless Steel 3/4" Inserts
  • 1 x Chrome Pilot Nose STI Intermediate Tap
  • 1 x HIT15 Installation Tool

► Why Tradies Grab This

A reliable workshop solution for repairing stripped spark plug and metric threads without replacing costly components. Ideal for mechanics and maintenance crews needing strong, long-lasting repairs that handle repeated assembly and harsh operating conditions.

► Industrial Shed’s Trade Guarantee – Shop with Confidence

  • We Stand By Our Gear: Workshop-grade repair products built for demanding conditions.
  • Loyalty Matters: Trade pricing and account benefits for repeat customers.
  • Real Support, No Runaround: Practical advice from people who understand workshop repairs.
  • Fast Delivery, Every Time: Reliable shipping to minimise downtime.

► Stock won’t last — get yours now at Industrial Shed!

Delivery options

We deliver across Australia. Freight costs depend on the item's size, weight and delivery address. Use the freight form above to request a price for this product.

Local delivery and collection

Local delivery is available on the Mornington Peninsula. You can also collect from Factory 1/30 Simcock Street, Somerville VIC 3912. Wait for your collection confirmation before coming in.

Tracking and delivery questions

Tracking details are sent after dispatch. For delivery timing, access requirements or help with a bulky item, call 03 5978 0078.

Read the shipping and delivery policy

Start a return

Contact us with your order number and the reason for the return. We will confirm the next steps before you send anything back.

Change of mind

The returns policy allows 14 days from delivery for eligible unused items in their original condition and packaging. Special orders and custom products are excluded from change-of-mind returns. Other exclusions may apply.

Faulty or damaged items

Send photos and a description of the problem to supportHQ@industrialshed.net.au, or call 03 5978 0078.

Read the full returns and refund policy

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