3591-5CNPF312 HELICOIL Screw Thread Inserts

Review HELICOIL Screw Thread Inserts. 5/16

Helicoil 3591-5CNPF312 screw thread inserts are a reliable solution for restoring damaged or worn-out threads in 5/16 inch (8.3mm) diameter holes with a 24 threads per inch (TPI) pitch. These thread inserts are manufactured by Helicoil, a trusted brand known for producing high-quality thread repair products.

The 3591-5CNPF312 thread inserts are specifically engineered for use in steel and other ferrous materials. They are made from a special alloy, which ensures excellent strength and durability. The insert's tapered design allows it to be easily installed in a damaged thread using a Helicoil tap and die set. The tapered design also helps to distribute the load evenly across the insert, reducing the risk of thread failure.

These thread inserts have a self-locking feature, which ensures that they stay in place once installed. The self-locking mechanism also helps to prevent the insert from being stripped out during use, providing added security and reliability.

The Helicoil 3591-5CNPF312 thread inserts are easy to install, even in hard-to-reach locations. They are designed to be installed using a standard Helicoil tap and die set, which is available separately. The installation process is straightforward, and the tap and die set comes with clear instructions to guide users through the process.

These thread inserts offer several advantages over traditional methods of thread repair, such as welding or tapping. They are less time-consuming, as they do not require the removal of the old thread or the use of expensive equipment. They are also more cost-effective, as they can be used multiple times, making them a more economical choice for thread repair applications.

In summary, the Helicoil 3591-5CNPF312 screw thread inserts are a versatile and effective solution for restoring damaged or worn-out threads in 5/16 inch (8.3mm) diameter holes with a 24 threads per inch (TPI) pitch. They offer excellent strength, durability, and reliability, making them a popular choice for a wide range of industrial and mechanical applications.

Helicoil 3591-5CNPF312 thread inserts are helical inserts designed to repair or restore damaged threads in a part or component. Here are some pros and cons of buying these thread inserts:

1. Easy to install: Helicoil thread inserts can be installed without the need for special tools or extensive mechanical knowledge.

2. Cost-effective: Compared to other methods of thread repair, such as re-tapping or replacing the part entirely, Helicoil thread inserts are a cost-effective solution.

3. High tensile strength: Helicoil thread inserts have a high tensile strength, making them suitable for use in high-stress applications.

4. Can be used on various materials: Helicoil thread inserts can be used on a variety of materials, including aluminum, steel, and cast iron.

5. Can be used to repair damaged threads caused by overloading, wear and tear, or stripping.

1. Limited thread sizes: Helicoil thread inserts are available in a limited range of thread sizes, so they may not be suitable for all applications.

2. May not be suitable for very thin or delicate materials: Helicoil thread inserts may not be suitable for very thin or delicate materials, as they require a certain amount of material to be effective.

3. May not be suitable for very large threads: Helicoil thread inserts are typically only available for smaller thread sizes, so they may not be suitable for very large threads.

4. May not be suitable for threads with complex pitches: Helicoil thread inserts may not be suitable for threads with complex pitches or non-standard thread forms.

Helicoil 3591-5CNPF312 thread inserts offer a cost-effective and easy-to-install solution for repairing damaged threads in parts and components. They are suitable for use in a variety of materials and applications, and have a high tensile strength. However, they are only available in a limited range of thread sizes, and may not be suitable for very thin, delicate, large, or complex threads.

If you have a component with damaged threads that requires repair, and the thread size is available for Helicoil thread inserts, then these are a good option to consider. They are easy to install, cost-effective, and offer a high tensile strength. However, if you have a very large, thin, delicate, or complex thread, then alternative methods of thread repair may be more suitable.

Details:

Specifications for the product are: - size: 5/16 24 part no.: 3591-5CNPF312 several lots of ten are available see volume discounting greater savings. The Helicoil thread inserts are made of precision-formed stainless steel commonly used in automotive repair, aerospace components, industrial machinery, and electronics manufacturing. The inserts come in a variety of sizes and are designed to repair stripped threads materials such as, aluminum, magnesium plastics. Helicoil screw thread inserts are available in lots of 10 inserts per order.

specifications threadtoollot:

• for years: 2024
• brand: Helicoil
• mpn: 3591-5cnpf312
• part type: Screw
• set or single item: Set

payments threadtoollot:

• credit card: diners-club
• other
• wallet: apple-pay

offer threadtoollot:

• started: february 17, 2026
• prices: $14.55–$95.40
• item condition:
  • New
  • New – Open box
• in stock #: 5
• availability: in stock
• sold #: 15
• options: ship-to-home

returns threadtoollot:

• paid by: buyer
• policy: returns accepted
• time: 30 days

seller threadtoollot:

• city: gilbert, arizona
• rating: 100.0%
• # reviews: 25

shipping threadtoollot:

• transit: 4-10 days
• carrier: usps
• type: calculated
• service: usps ground advantage
• class: standard

general threadtoollot:

• category: Auto Parts > Supplies > Hand > Threading Tools