Heat Insert Nuts, Brass Knurled Threaded Inserts for 3D Printing
These heat insert nuts are turned from BG brass, golden brown and rust-resistant. Straight, cross and diamond knurling can be produced to change pull-out resistance, and CNC-turned threads cover M2 to M20, with M2–M8 charted. As brass knurled inserts, they place a durable metal thread inside thermoplastic: the knurl grips the softened wall so screws can be driven and reopened without stripping the plastic. The same part serves as threaded inserts for 3D printing, molded housings and electronic enclosures. Plain, tin and nickel finishes are available; product and packaging can be customized.
5.0
Sample:
Y
Quality control:
Y
Brand name:
GG Screw
Product name:
Heat Insert Nuts
MOQ:
10000pcs but can negotiate
Place of origin:
China
OEM&ODM:
Y
Standard:
ISO,DIN, ANSI/ASME, JIS ,GB
Delivery time:
5-7 DAYS
Quality guarantee:
Y
Spec:
m3 m4 m5 m6 m8 m10 m12 1/4 3/8 5/16，customized
Finish:
Brass, customized
design customization
Please fill out the form below to request a quote or to request more information about us. Please be sure to upload customized requirement documents or pictures, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
View size guide
Please fill out the form below to request a quote or to request more information about us. please be as detailed as possible in your message, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
| Feature | What the image states | What it means in use |
|---|---|---|
| Brass body | BG brass, surface color golden brown | A metal thread inside plastic parts, with a warm golden appearance |
| Rust resistance | Fastness, no rust | Suitable for indoor housings and equipment that must stay clean |
| Corrosion resistance | Corrosion resistance listed as a benefit | Better tolerance of humid indoor environments than plain steel inserts |
| Lustre | That has luster | Visible metal finish on exposed or semi-exposed parts |
| High hardness | High hardness badge | Brass body resists thread wear during repeated assembly |
| No pollution | No pollution badge | Cleaner assembly compared with adhesive-based thread repair |
| CNC turning | CNC turning process for precision thread | Consistent thread form and a clean knurl edge |
| Authentic guarantee | Authentic guarantee badge | Material and process declared by the manufacturer |
Knurl Options
| Knurl type | Visual pattern | Effect on grip | Typical use |
|---|---|---|---|
| Straight knurl | Parallel vertical ridges around the body | Axial resistance, straightforward press and heat set | General plastic housings, simple wall thickness |
| Cross knurl | Two opposing ridge directions forming a lattice | Higher resistance against both rotation and pull-out | Parts under repeated screw torque |
| Diamond knurl | Diamond-shaped raised pattern | Balanced grip in multiple directions | Enclosures, brackets, mixed-load joints |
| Other patterns | Produced to drawing | Depends on pattern geometry | Custom projects |
Dimensions and Published Size Chart
Dimension definitions from the drawing
| Symbol | Meaning | Notes |
|---|---|---|
| D | Thread inner diameter | Matches the screw size, e.g. M3 = 3 mm |
| P | Thread pitch | Standard coarse pitch per size |
| DK | Outer diameter | Body diameter across the knurl |
| K | Slot width | Range shown per size in the chart |
| L | Height | Defined in the drawing; numeric values are not listed |
Published size chart (M2–M8)
| Size | Thread inner diameter D (mm) | Pitch P (mm) | Outer diameter DK (mm) | Slot width K (mm) |
|---|---|---|---|---|
| M2 | 2 | 0.4 | 3.5 | 1.3–3.5 |
| M2.5 | 2.5 | 0.45 | 3.5 | 1.5–4 |
| M3 | 3 | 0.5 | 4.3 | 1.2–6 |
| M4 | 4 | 0.7 | 5.5 | 0.4–6.6 |
| M5 | 5 | 0.8 | 7 | 0.8–2 |
| M6 | 6 | 1 | 8 | 1–2.8 |
| M8 | 8 | 1.25 | 10 | 1.4–2.3 |
Materials and Finishes
| Option | Description from the images | Consideration |
|---|---|---|
| BG brass, plain | Golden brown surface, no additional plating | Natural brass appearance, suited to visible parts |
| Tin plated | Listed as an available finish | Lighter, solder-friendly appearance |
| Nickel plated | Listed as an available finish | Silver tone, suited to parts that should match nickel hardware |
| Other finishes | "etc." per the product display | Confirmed per project |
Installation Sequence
| Step | Action | Why it matters |
|---|---|---|
| 1 | Confirm insert size against the plastic part drawing | D, DK and L must suit wall thickness and boss diameter |
| 2 | Set the hole to the recommended diameter for the resin | Too tight cracks the boss; too loose reduces pull-out strength |
| 3 | Heat the insert with a soldering iron or thermal press | The insert must reach the softening point of the plastic |
| 4 | Press in perpendicular to the surface | Tilting opens a gap on one side and weakens the joint |
| 5 | Hold until the plastic sets around the knurl | The knurl must fill with plastic to lock the insert |
| 6 | Cool, then verify thread and flush height | Confirms the screw will start cleanly and seat properly |
Typical Applications
These are the standard uses for this insert type. The images show the product itself and do not enumerate application cases.
| Application | Why a heat insert nut fits |
|---|---|
| 3D printed enclosures | Printed bosses accept heat-set inserts and gain machine-screw threads |
| Injection-molded housings | Adds a serviceable metal thread where repeated opening is expected |
| Electronic device shells | Allows repeat assembly during testing and repair |
| Control boxes and panels | Provides a durable fastening point in thin plastic walls |
| Prototype and small-batch builds | Inserts can be reworked if a boss is reprinted |
| Equipment covers and brackets | Metal thread in plastic avoids thread stripping over time |
Customization — Product and Packaging
| Customization area | Adjustable items | What the buyer provides |
|---|---|---|
| Thread | M2 to M20 range, including M2.5, M3, M4, M5, M6, M8 | Target thread size list |
| Length | Insert height L to drawing | Drawing with L and tolerance |
| Knurl | Straight, cross, diamond or custom pattern | Reference image or drawing |
| Material | BG brass as standard; other copper alloys on request | Material specification |
| Finish | Plain, tin plated, nickel plated, other | Finish requirement and appearance sample |
| Packaging | Poly bag, blister, plastic box, carton | Packing method and quantity per pack |
| Label and box | Logo, product name, size table, warning text, barcode | Artwork and label copy |
| In-box contents | Size mix and quantity per size | Size list and quantity per size |
| Carton | Carton mark, packing list, carton size | Marking file and shipping data |
Quality Checkpoints
| Checkpoint | What is verified | Method |
|---|---|---|
| Thread | Size, pitch, start and run-through | Go/no-go gauge and matching screw |
| Outer diameter | DK within drawing tolerance | Measurement per batch |
| Height | L within drawing tolerance | Measurement per batch |
| Knurl | Pattern, depth and uniformity | Visual and sample comparison |
| Bore | D and concentricity with the thread | Gauge and section check |
| Finish | Color, coverage, absence of bare patches | Visual inspection against sample |
| Cleanliness | No burrs, chips or oil residue | Visual and handling check |
FAQ
Q1. What are heat insert nuts used for?
They put a reusable metal thread into thermoplastic parts. The insert is heated and pressed into a boss, the plastic softens around the knurl, and after cooling the part accepts a machine screw.
Q2. Which sizes can be produced?
M2 to M20 per the product display. The published size chart covers M2, M2.5, M3, M4, M5, M6 and M8 with thread diameter, pitch, outer diameter and slot width.
Q3. What is the difference between straight, cross and diamond knurl?
Straight knurl gives axial grip with parallel ridges, cross knurl adds resistance in two directions, and diamond knurl spreads grip across a diamond pattern. Cross and diamond patterns generally resist rotation better under repeated torque.
Q4. Is the material really brass?
The image states BG brass with a golden brown surface. If your project needs a specific copper alloy or a material certificate, state it at quotation stage.
Q5. Which finishes are available?
Plain brass, tin plated, nickel plated and other options per the product display. No plating thickness is stated, so specify it if the appearance or corrosion requirement is tight.
Q6. Can these brass knurled inserts be used in 3D printed parts?
Yes. Printed bosses are a common host for heat-set inserts, provided the boss wall is thick enough and the hole is sized for the resin. PETG, ABS, ASA and similar thermoplastics are typical hosts; verify on a test print first.
Q7. Do you supply the hole size and installation temperature?
The images do not publish them, because they depend on the resin and insert size. Follow the resin supplier's data and confirm with a test boss.
Q8. Are these threaded inserts for 3D printing also suitable for molded parts?
Yes. The same insert works in injection-molded bosses, and it is often chosen where a housing must be opened repeatedly for service.
Q9. Can the length and knurl be customized?
Yes. Height, knurl pattern, thread size and finish can all be adjusted to a drawing or sample.
Q10. Can packaging be customized?
Yes. Bag, blister, plastic box and carton options are available, together with custom labels, logo, size table and barcode.
Q11. What is the minimum order quantity?
Not stated in the images. MOQ depends on size, material and packaging, and is confirmed at quotation stage.
Q12. Is there a warranty or test report?
No certification or test report is shown in the images. If your market requires one, raise it before production so the test scope can be agreed.
Q13. How do I avoid cracking the plastic boss?
Keep adequate wall thickness, use the recommended hole diameter, control the insertion temperature and press perpendicular to the surface. A test boss is the fastest way to confirm the setup.
Q14. Can the insert be removed and reused?
A heat-set insert can usually be reheated and reset, but the surrounding plastic is disturbed each time. For parts that must be reworked repeatedly, plan a slightly larger repair insert or a new boss.
Send your thread size, insert height, knurl pattern, finish and packaging requirement to receive a quotation for heat insert nuts in brass, with samples before mass production and custom labels for your own brand.
{{item.score}} Stars
{{item.pre}}%
{{item.nickname ? (item.nickname.slice(0, 2) + '*****') : item.source === 1 ? 'mall buyer' : '--'}}
{{item.comment_time}}
Review in the {{item.country}}
{{itemAttr.params_key}}: {{itemAttr.params_value}}
820 pieces in one case: this M2 socket head cap screw kit covers seven lengths from M2 × 4 mm to M2 × 20 mm, 60 screws each, plus 200 M2 nuts and 200 M2 flat washers. The black zinc plated M2 screws are carbon steel with a clean black appearance and basic surface protection, and the hex socket drive allows controlled tightening in tight spaces. Makers and repair shops often reuse the same M2 hardware across printers, housings and small mechanisms, so the kit also serves as stock of M2 screws for 3D printing, electronics builds and RC models. A hex key is included, not counted in the 820 pieces. Case 125 × 64 × 20 mm, 195 g, 96 boxes per carton. Ready stock available; box, label, logo and contents customizable.
458 pieces, ten sizes, one case: this cotter pin assortment kit combines split cotter pins and R clips in 304 stainless steel with a natural silver finish. Four split cotter pin sizes run from 1 × 16 mm to 3 × 30 mm (270 pcs); six R clip sizes run from 1 × 18 mm to 2.5 × 45 mm (188 pcs). The 304 stainless steel cotter pins resist corrosion, keep a smooth surface and stay strong yet flexible when the legs are spread. The R clip assortment handles quick pin and shaft retention. Case 172 × 95 × 22 mm, 315 g, 24 boxes per 28 × 25 × 25 cm carton. Ready stock available; box, label, logo and in-box contents customizable.
Stainless Steel CNC Machining for custom CNC stainless steel parts in 303, 304, 316L and 17-4PH. Milling, turning and multi-axis work run in one shop, holding ±0.01 mm and Ra 0.8, with passivation, electropolishing and bead blasting for corrosion-critical surfaces. We machine manifolds, flanges, housings, impellers, brackets and instrument bodies for food, medical and marine equipment, from 1 to 5,000 pcs, with material certificates and CMM reports. 316L Stainless Steel Machining is quoted with grade-specific tooling notes, so the price reflects what the alloy actually costs to cut.
5 axis CNC machining service for custom CNC machine spare parts and aluminum CNC milling parts. Simultaneous five-axis milling cuts undercuts, compound angles and contoured pockets in one setup, holding ±0.01 mm position and Ra 0.8 on functional faces. We reproduce obsolete or undocumented parts from a sample and produce replacement flanges, spools, valve blocks, threaded rings and impellers in 6061-T6, 7075-T6 and 304 stainless, 1 to 5,000 pcs, with CMM reports and material certificates. Send a STEP file or a photo with dimensions for a quotation within one week.
Contact Us
Feel free to contact with us
If you have any questions about our products or services, feel free to reach out to customer service team.
Contact: Angel
Contact number: +86 18602085825
Email: angel@ganggus.com
WhatsApp: +86 18602085825
Address: Room 101, Building 2, No.11 jintang Road,changping Town, Dongguan City, Guangdong Province, CN
Quick Links
Product
Solution
Contact social media