# HELIFOUNER 3/8-16 x 20mm Wood Threaded Inserts, 20 Pieces

Pieces: HELIFOUNER wood threaded inserts are a 20-piece set with 3/8-16 internal threads and a stated 20mm length. The zinc-finished carbon steel inserts are driven through an internal hex, with the listing describing use in wood and composite materials.

- [Original product page](https://best-deals.pro/product/helifouner-3-8-16-x-20mm-wood-threaded-inserts)
- [View offer](https://best-deals.pro/visit/helifouner-3-8-16-x-20mm-wood-threaded-inserts)
- Market: US
- Language: en-US
- Currency: USD
- Brand: HELIFOUNER
- Model: HELIFOUNER-Nut-Inserts
- Category: Tools & Garden > Hardware & Building Materials
- Price: 6.49 USD
- Previous price: 12.99 USD
- Discount: 50%
- Price checked: 2026-11-12T11:10:18.914Z
- Rating: 4.6 / 5
- Reviews: 306

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- Designed for screw-in installation into drilled wood holes using an internal hex drive.
- The listing describes use in soft wood, plywood, fiberboard and composite materials, as well as furniture repair.
- A 15mm drill bit is specified for the pilot hole, with a countersink to the insert head size.

## Pros

- The 3/8"-16 internal thread suits projects using that stated coarse thread size.
- The internal hex drive and listed 20mm insert length support screw-in installation in furniture and woodworking projects.
- The listing claims zinc-plated carbon steel construction and includes a hex wrench in its package description.

## Specifications

### Identity and set
- Brand: HELIFOUNER
- Model: HELIFOUNER-Nut-Inserts
- Set quantity: 20
### Materials and finish
- Material listed: Carbon Steel
- Exterior finish: Zinc
### Thread and dimensions
- Thread size: 3/8"-16
- Thread type: Unified National Coarse
- Thread coverage: Fully Threaded
- Thread class: Coarse
- Size name: 3/8"-16 x 20mm
- Item diameter: 15 millimeters
- Outside diameter: 0.38 inches
- Compatible groove diameter: 0.59 inches
### Drive
- Drive style: Internal Hex

## Before you buy

- Listing details are inconsistent about compatible bolts: the title and specifications state 3/8-16, while installation text also says 5/16-18. The stated 15mm pilot-hole size, 0.38-inch outside diameter and 0.59-inch compatible groove diameter do not align clearly. Confirm the correct screw thread and hole dimensions for the selected listing before installation.

## A good fit for

- Wood furniture repairs such as chair legs, cabinets, headboards and footboards, where a 3/8-16 threaded insert is the intended fit.
- Woodworkers seeking a set of 20 inserts for soft wood, plywood or composite materials.

## Less suited to

- Projects needing a confirmed screw size or hole dimension without first resolving the listing's inconsistent fit details.
- Applications requiring a different insert thread size or a verified material-performance rating.

## Customer feedback

Aggregate ratings lean positive, with most ratings in the top two star categories, but they do not reveal specific strengths, complaints or reasons for satisfaction. For a furniture repair, verify the screw thread and hole dimensions first, since the listing gives inconsistent fit guidance.

## Frequently asked questions

### What size thread do these inserts use?
The listed thread size is 3/8"-16, described as Unified National Coarse. However, installation text also mentions 5/16-18 bolts, so confirm the intended screw compatibility before buying.
### What hole size does the listing recommend?
It specifies a 15mm drill bit and separately gives a 0.59-inch compatible groove diameter. Those details are not clearly consistent, so verify the required hole size for the selected insert.
### What materials are these inserts intended for?
The listing describes applications in soft wood, plywood, fiberboard and composite materials, including furniture repairs.
### Is a wrench included?
The package description claims one 8mm hex wrench is included. Check the selected listing because its package details are not independently confirmed.

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## Add-ons

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## Images

![HELIFOUNER 3/8-16 x 20mm Wood Threaded Inserts, 20 Pieces — 1](https://best-deals.pro/i/4iOwgvwo3GYHmET4PlZxiC6IqkfUCjilvBOiFXxln6r92GufGpbRm6rta_4mVvR8BMOvP6wf1SbroWzJSMZGihZhp0GkmEfHM_ZhMlLGgP-av0_8vf1E.jpg)

![HELIFOUNER 3/8-16 x 20mm Wood Threaded Inserts, 20 Pieces — 2](https://best-deals.pro/i/8jRW9HY63xN_W2fKOU5OxhGzgSM9_ZbFxeu1C6ytrfSyCPGW87AGfyEzBNAwjWzza4DDzREjNhDLR8__4Y17B3kV6xBqINNBUZFc0PIdmytb9_r4isSJ.jpg)

![HELIFOUNER 3/8-16 x 20mm Wood Threaded Inserts, 20 Pieces — 3](https://best-deals.pro/i/8G40tZab4Y7ZRHVwUlfKBoCCjMDqxHajQ5PaVhnl8qUkKwI1azx1t1-k7qEfQbzbCP7DnjVIWq7V79Iv3hoHvOtFE_f5BClXH0w8snLVh--sm1i2rvEW.jpg)

![HELIFOUNER 3/8-16 x 20mm Wood Threaded Inserts, 20 Pieces — 4](https://best-deals.pro/i/aV6nOaR8TRoRkpk39g7SLIlZgDsZB7nzHDKuEhBi_DM83x6D4QRHk6AimalbiWph6k0JpJcvJtu5dSTihxZxsqzCcxQJvDoKcmYhCwPk3fsZvpAQjFQE.jpg)

![HELIFOUNER 3/8-16 x 20mm Wood Threaded Inserts, 20 Pieces — 5](https://best-deals.pro/i/ea41uI4M2t7fdAMZZZYW9h3mHGc6zVc-IdhMgdNoCGKeg-BkycyVoZtN0pr27cjWARfT7jJupdAvKHhBDRjU1odJ-tRlCj81NzKGTJAolI9gSdGHjo4e.jpg)

![HELIFOUNER 3/8-16 x 20mm Wood Threaded Inserts, 20 Pieces — 6](https://best-deals.pro/i/oOBkKA685LkpEPI7gWxypK5dXHB39oVIBxw2gjvNGYDl-FsBbOelFdIhUa5THR5brEBP1jsakr0ynPV13FrnvQR1xqRK_1N7S5cOSUZbJs4u5jcyED9w.jpg)