Plastic knob mold

We specialize in custom plastic knob mold development, plastic knob component production, and optional assembly services—not finished product trading. Our molds are engineered to match your plastic knobs’ unique needs (e.g., smooth rotation, ergonomic grip, functional markings) , with tailored designs, tactile-friendly material compatibility, and optimized injection molding to deliver reliable plastic knob parts for appliances, instruments, and furniture.

1. Custom Mold Structures: Tailored to Plastic Knob Requirements

Plastic knobs (e.g., stove control knobs, audio equipment knobs, furniture drawer knobs) demand rotational precision, comfortable grip, and often functional markings—our mold structures are customized to address these key demands:

Cavity & Core: Machined via high-precision CNC machining (tolerance as tight as ±0.01mm for rotation shafts) to replicate critical features—such as central shaft holes (diameter tolerance ±0.008mm for smooth rotation), ergonomic grip textures (e.g., raised dots, grooved lines, 0.1–0.3mm depth), and functional markings (embossed/engraved numbers/scales, 0.05–0.1mm depth for visibility). For knobs with hollow or layered structures (to reduce weight), the mold’s internal cores ensure uniform wall thickness (1–2mm) and avoid deformation that affects rotation.

Gating System: Designed to avoid visible marks on grip surfaces and ensure uniform material flow. For small knobs (diameter ≤30mm), micro pin gates (0.4–0.6mm) positioned at the non-grip base (near the shaft hole) are used—they leave minimal residues and eliminate post-molding trimming. For large knobs (diameter ≥50mm) or those with complex textures, hot runner systems with single-point gates ensure consistent filling, reducing material waste by 10–15% and preventing texture distortion.

Cooling System: Optimized for knobs’ rounded or cylindrical shapes and thin-walled grip zones. Spiral cooling channels around the mold cavity ensure even heat dissipation—critical for maintaining rotational shaft hole precision (no shrinkage that causes tight rotation) and reducing cycle time by 20–30%. For knobs with thickened base areas (near the shaft hole), additional cooling pins accelerate cooling to avoid sink marks.

Ejection System: Uses ejector sleeves (for the central shaft hole, to protect rotation precision) or ejector pins (arranged at non-grip, non-marked areas) to avoid damage. Gentle ejection force preserves grip textures and functional markings—ensuring the knob’s usability and aesthetic appeal aren’t compromised.

2. Suitable Plastic Materials: Matched to Plastic Knob Applications

Plastic knobs face frequent rotation, hand contact (wear/ sweat), and environmental factors (temperature changes, chemical exposure)—we select materials based on tactile feel, durability, and use scenarios:

ABS (Acrylonitrile Butadiene Styrene): Ideal for general-purpose knobs (e.g., furniture drawer knobs, basic appliance knobs). Offers good impact resistance (no cracking from accidental drops), easy coloring (supports custom RAL/Pantone shades), and moderate rigidity—suitable for indoor, low-temperature-fluctuation environments (≤80°C).

PC (Polycarbonate): Perfect for high-temperature or transparent knobs (e.g., stove control knobs, oven knobs, backlit audio knobs). Features heat resistance (up to 130°C), shatterproof properties, and high transparency (85–90% for backlit markings)—withstands heat from appliances and ensures clear visibility of scales.

PP (Polypropylene): Used for lightweight, cost-effective knobs (e.g., small household appliance knobs, storage cabinet knobs). Provides good chemical resistance (to water, mild detergents), low density (reduces product weight), and easy processing—suitable for low-wear, low-temperature scenarios (≤60°C).

TPR/TPU (Thermoplastic Rubber/Urethane): Suitable for soft-grip knobs (e.g., fitness equipment knobs, medical device knobs). Offers elastic feel (Shore A 50–70) for comfortable grip (reduces hand fatigue), anti-slip properties (even with wet hands), and wear resistance—ideal for knobs requiring frequent, prolonged use.

POM (Polyoxymethylene): Great for precision-rotation knobs (e.g., scientific instrument knobs, audio volume knobs). Boasts low friction coefficient (0.15–0.3) for smooth rotation (no "sticking" or "jitter"), high dimensional stability (low shrinkage ≤2%), and wear resistance—ensures consistent rotational performance over long service life (≥10,000 rotations).

3. Injection Molding Process: Optimized for Plastic Knob Quality

Our injection molding process is fine-tuned to meet plastic knobs’ rotational precision, tactile feel, and aesthetic demands, with these core advantages:

Rotational Precision: Injection parameters (temperature 180–260°C, pressure 60–100MPa) are optimized to ensure uniform material density—central shaft holes have consistent diameter (variation ≤0.008mm) and smooth inner surfaces, enabling rotation with resistance variation ≤5% (no tight or loose spots).

Tactile & Aesthetic Consistency: Mold cavity polishing (Ra ≤0.4μm for smooth grips) and texture engraving (precision ±0.01mm for grip patterns) ensure each knob has identical tactile feel. Functional markings (numbers/scales) are reproduced with sharp edges—no blurring or fading, ensuring readability. Defect rate (e.g., burrs, uneven textures) is kept below 0.3%.

Efficient Production: Multi-cavity molds (16–48 cavities, based on knob size) maximize output. For standard 25mm-diameter knobs, daily production reaches 80,000–120,000 components. Automated sorting and quality checks (via rotation testing, visual inspection) reduce labor costs and ensure 99.8% defect-free output.

Cost Optimization: Hot runner systems reduce material waste by 10–15%; for high-volume orders (50,000+ knobs), per-unit cost can be reduced by 10–12%. Two-shot molding is optional for knobs needing dual properties (e.g., rigid ABS core + soft TPR grip), integrating functions in one step and cutting assembly costs.

4. Our Services: Beyond Molds—Plastic Knobs & Assembly

We provide end-to-end solutions for plastic knob production, not just molds:

Plastic Knob Manufacturing: Produce custom knobs in various sizes (diameter 10–80mm), shapes (cylindrical, spherical, fluted), and designs (with/without markings, soft-grip layers). Supports custom colors (RAL/Pantone codes), surface treatments (matte, glossy, anti-fingerprint), and shaft hole specifications (round, D-shaped, splined).

Value-Added Assembly: Optional assembly services for knob sub-assemblies—such as inserting metal rotation shafts (for enhanced durability), attaching anti-slip washers (for stable positioning), or assembling knobs with indicator rings (for clear scale alignment). Delivers ready-to-install sub-assemblies, saving your production time.

Custom Design Support: Offer 3D mold design and rapid prototyping (via SLA 3D printing). We can produce 30–50 prototype knobs in 2–3 days for you to test rotation smoothness, grip comfort, and marking readability—optimizing the mold design before mass production.

We are plastic mold maker and can provide custom mold service, we can make injection molds, blow molds, rotational molds and die-casting molds.

For custom injection molds, we can provide professional custom injection molding services. Usually Plastic injection mold manufacturing Molding are manufactured using injection molding technology. The mold materials for injection molds can be chosen from P20, 718, S136, H13 and so on. The mold material reflects the mold life and product material requirements.

For parts that require blow molding production, we can also provide professional custom blow molding services.

Plastic injection mold manufacturing Injection Mould making

1.We communicate product design according to samples/drawings and your requirements.

2.After the product design is confirmed, we carry out the mold design, we provide all kinds of injection molds, blow molds, silicone molds, die-casting molds services.

3.Material procurement, steel cutting and mold basic tools.

4.Mold assembly

5.Mold inspection, tracking and controlling mold processing.

6. We will inform you the date of mold trial and send you the sample inspection report and injection parameters together with the sample.

7.Your instruction and confirmation of shipment.

8.Prepare the mold before packing.

Plastic injection mold manufacturing molding Specification

1. Professional manufacturer, design, production injection mould and stamping mould quality control

2. rich export experience plastic injection mould and stamping mould

3. Reasonable price of design mould

4. Cavities: single or as per your requirements cavity

5. Treatment: S45C Pretreat>25Hrc,And Nitriding

6. Mould Steel: Cavity ,Core and slide: P20 ,2738,2136 available Moldbase :LKM available

7. Standard:DEM ,HUSKY,available

8. Hot runner: according to your demand

9. Life time: >300 Thousand Times

10. Package: Plywood case, anti-rust paint

Mold design：

Information you need to provide us

1. If you have drawings, 2D drawings, 3D drawings (preferably in STEP format).

2. If there are no drawings, you need to provide specific length, width, height and weight information. (It’s best to send us samples)

3. Should the mold be sent to your country, or leave the mold in our factory and we will help you produce the product.

4. Mold material requirements, cavity number requirements (you can tell us about the size of your injection molding machine)

5. Product material requirements and product quantity. (You can tell us about the use of the product and we can give you suggestions)

Transaction process:

Mold testing：

Once the mold is complete, I do a mold test. It usually takes about 3-5 days to complete. We need to assemble the mold, adjust the pressure data of the machine, and try production. We need to check whether there are problems during the normal production of the mold and make modifications.

Product packaging

Packaging according to your needs

1.By air ,it takes 3-7 days for delivery .The goods can be shipped by DHL ,Fedex ,UPS .

2.By sea ,the delivery time is based on your port .

To South East Asian Countries takes about 5-12 days

To Middle east countries takes about 18-25 days

To European countries takes about 20-28 days

To American countries takes about 28-35 days

To Australia takes about 10-15 days

To African countries takes about 30-35 days.

Factory

Video-1: (Factory Video)

Video-2: (Injection Molding)

Video-3: (Blow molding)

Video-4: (Blow molding)

Video-5: (Roll molding)

Customer satisfaction is our most important goal. We focus on communication and cooperation with our customers, always pay attention to their needs and provide quick response and quality customer service. Our injection production mold factory is committed to establishing long-term relationships and ensuring that our customers receive the best after-sales service during the purchase and use of our products, and we will definitely do our best to solve any problems for our customers.

FAQ

1. Who are we?

We are based in Zhejiang, China, start from 2014,sell to North America(30.00%),Southern Europe(10.00%),Northern.

Europe(10.00%),Central America(10.00%),Western Europe(10.00%),Mid East(10.00%),Eastern Europe(10.00%),South America(10.00%). There are total about 51-100 people in our office.

2. How can we guarantee quality?

Always a pre-production sample before mass production;

Always final Inspection before shipment.

3. What can you buy from us?

Mould,Plastic Product, Metal Product,Dental Product,CNC machining.

4. Why should you buy from us not from other suppliers?

Ningbo P&M Plastic Metal Product Co., Ltd. We main do all kinds of 3d design, 3d printing and plastic metal molds tooling and products. We have our own engineer and factory. One-stop supply:3d design - 3d printing - mold making - plastic injection.

5. What services can we provide?

Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU;

Accepted Payment Currency:USD,EUR;

Accepted Payment Type: T/T,L/C,PayPal,Western Union,Escrow;

Language Spoken:English,Chinese,Spanish,French,Russian.

6. What are the characteristics of your service?

1. Your inquiry related to our products or prices will be replied within 24hours.

2. Welltrained and experienced staffs to answer all your enquiries in fluent English.

3. Offering the support to solve the problem in the application or selling period.

4. Competitive prices based on same quality.

5. Guarantee samples quality same as mass production quality.