1 / 6HELIFOUNER 1/4"-20 x 20mm Blue Zinc-Plated Wood Threaded Inserts, 40-Piece
Blue Zinc-Plated: HELIFOUNER wood threaded inserts provide 1/4"-20 internal threads in a 20mm-long carbon-steel insert. This 40-piece set is presented for furniture repairs and woodworking in soft wood, plywood, fiberboard, and other listed materials, with hex-socket installation.
At a glance
- Hex-socket drive is specified for turning the insert into a prepared wood hole.
- The listing describes use in furniture repairs and names soft wood, plywood, and fiberboard among the intended materials.
- The product is specified for standard 1/4-20 screws and bolts.
Reference price: $9.99
Price checked: Nov 12, 2026
View offerAhead of Black FridayExplore the selectionOften bought together
Pros and cons
Pros
- The 1/4"-20 thread size suits projects using matching standard screws or bolts.
- A 40-piece quantity supports multiple repairs or installations.
- The listing gives a specific installation approach using a 3/8" drill bit and hex wrench.
Technical specifications
19 specifications| Brand | HELIFOUNER |
|---|---|
| Model | HELIFOUNER-Nut-Inserts |
| Fastener type | Insert |
| Number of pieces | 40 |
| Size | 1/4"-20 x 20mm |
|---|---|
| Thread size | 1/4"-20 |
| Thread type | Unified National Coarse |
| Inside thread size | #4 |
| Thread style | Right Hand |
| Thread coverage | Fully Threaded |
| Thread class | Coarse |
| Item diameter | 0.25 inches |
| Compatible groove diameter | 9.5 millimeters |
| Material listed | Carbon Steel |
|---|---|
| Exterior finish | Zinc |
| Color | Blue |
| Drive style | Internal Hex |
|---|---|
| Screw head style | Hexagonal with Flat Top |
| Grade rating | industrial |
What to know before buying
- The listing advises a precise 90-degree installation and says to countersink the hole to the head size. It suggests enlarging the hole in high-hardness wood. Keep the small parts away from children.
Listing details to confirm
The listing's description states that one 6mm hex wrench is included, but the separate package details do not confirm the full contents. It also gives a 3/8" drill-bit installation instruction and separately recommends a 9.5 +/- 0.2 mm hole, while the listed compatible groove diameter is 9.5 millimeters. The inside thread size is also shown as #4 despite the stated 1/4"-20 thread. Check the dimensions and wrench inclusion for your application before ordering.
Who is it for?
A good fit for
- Wood furniture repairs involving matching 1/4"-20 screws or bolts.
- DIY and woodworking projects using soft wood, plywood, or fiberboard.
- Buyers needing a multi-piece supply of blue zinc-plated inserts with internal hex drive.
Less suited to
- Projects requiring a different internal thread size or insert length.
- Buyers who need package contents or installation dimensions confirmed without checking the selected listing.
Customer reviews on Amazon
- 5 stars
70% 70% - 4 stars
14% 14% - 3 stars
8% 8% - 2 stars
2% 2% - 1 star
6% 6%
Customer feedback describes the inserts as good quality, as described, functional, and worthwhile for the money. For projects that match the listed 1/4"-20 size and wood applications, those reports are relevant, though experiences are not uniformly positive and do not resolve the listing's dimensional and package uncertainties.
Positive themes
- Customers describe the inserts as good quality and working as intended.
- The supplied feedback characterizes them as good value for money.
Frequently asked questions
What screws fit these inserts?
The listing specifies 1/4"-20 threads and says they fit standard 1/4-20 screws and bolts.
What hole size does the listing recommend?
It gives a 3/8" drill-bit instruction and separately recommends a 9.5 +/- 0.2 mm hole. It also lists a compatible groove diameter of 9.5 millimeters, so confirm the right preparation for your material and installation.
Is a hex wrench included?
The detailed description lists one 6mm hex wrench, but the separate package details do not confirm it. Check the selected listing if the wrench is essential.
What materials are these intended for?
The listing names soft woods, plywood, and fiberboard, and also refers to composite materials and hardwood. It recommends enlarging the hole when the wood material is high-hardness.
Alternative options
50 Pcs 5/16"-18x15mm Threaded Inserts for Wood for Furniture Reinforcement | 5/16-18 Threaded Inserts for Wood Inserts Wood Insert Nut Perfect for Crafting & Wooden Furniture Reinforcement
$9.99
1/4"-20 x 20mm Threaded Inserts for Wood, Zinc Plated Carbon Steel Hex Socket Drive Insert Nuts for Wood Furniture, Hex Spanner Included, 40 PCS
$6.74
SVLING Threaded Inserts and Bolts Set, 40 Sets, 1/4-20 x 19/32" Threaded Inserts for Wood, 1/4-20 x 3/4" Furniture Screws, 1/4 Bolt Flat Head 304 Stainless Steel, Hex Socket Drive, 2Pcs Hex Wrench
$8.99
Kindroufly 1/4"-20 x 25mm Threaded Inserts, Nut Inserts, Wood Inserts, Zinc Plated Carbon Steel, 1/4-20 Threaded Inserts with Hex Wrench for Wood Furniture Screw, Total 31 Pieces
$6.98
Taiss 64PCS Threaded Inserts for Wood Furniture Screws | 1/4‑20x3/4",1/4‑20x19/32" Threaded Insert Nuts and Bolts,Hex Socket Drive,12.9 Galvanizing of Alloy Steel,With Allen Wrench
$8.99
QWORK Stainless Steel Threaded Insert for Hard-Wood, 1/4-20 Internal Threads 20 Pack 5/8" Long Nut Inserts for Hardwoods, Softwoods, Plywood and Composites
$19.97
E-Z LOK Knife Thread Insert for Hard Wood, 0.25-28, 0.500 in, 25 ct | Brass construction
$21.67
E-Z LOK Knife Thread Insert for Soft Wood, Hex Flush, 10-32, 13mm, 50 ct | Zinc construction
$9.78
E-Z LOK Thread Insert for Hard Wood, 0.3125-18, 1.00 in, 10 ct | Brass construction, Model 400-510
$19.69
1/4"-20 Threaded Inserts for Wood, Kit Has 40 Pcs Inserts & Assorted Bolts | 40 Pcs...
$15.99
30 Sets 1/4-20 Threaded Inserts for Wood Kit for Woodworking & DIY Projects | Screw...
$9.99
51Pcs 1/4"-20 Threaded Inserts, Female Thread SAE Knurled Nuts Assortment Kit, Bras...
$12.98
