Plastics Injection Molding - Online services 

When you walk into a factory floor, the rhythmic hum of machines and the scent of freshly molded plastic parts create a unique atmosphere. These parts—from automotive components to medical housings—are often produced using plastics injection molding, one of the most efficient and scalable manufacturing processes in the world.

In this article, I’ll share first-hand experience from real projects, explain how the process works, compare it with other methods, and give you practical tips for choosing the right supplier.

What Is Plastics Injection Molding?

Plastics injection molding is a high-volume manufacturing process where molten plastic is injected into a steel or aluminum mold under high pressure. Once cooled, the mold releases a solid part that is accurate, durable, and repeatable.

• Materials used: ABS, PP, PC, Nylon, PEEK, and more.

• Applications: Automotive dashboards, electronic housings, medical device parts, consumer goods.

• Tolerance level: ±0.05 mm is achievable in precision parts.

✅ From my own factory experience: we ran a batch of 10,000 ABS automotive clips, and the cycle time per part was just 28 seconds—showing why injection molding is unbeatable for mass production.

How Does the Injection Molding Process Work? (Step by Step)

1. Mold Design & Manufacturing – Engineers create a 3D design, followed by CNC machining or EDM to produce the mold.

2. Material Preparation – Plastic pellets are dried and fed into the hopper.

3. Injection – The plastic is melted and injected into the mold cavity.

4. Cooling – The molten plastic solidifies inside the mold.

5. Ejection – Ejector pins push the finished part out.

6. Quality Inspection – Parts are measured with CMMs to ensure tolerance compliance.

? Cycle time example: For a standard smartphone case, the injection cycle is about 35–40 seconds.

Plastics Injection Molding vs. Other Manufacturing Methods

Why Choose Plastics Injection Molding?

• Scalability: Ideal for runs of 10,000–1,000,000 parts.

• Cost efficiency: Once tooling is done, unit cost can drop below $0.10 per part.

• Design flexibility: Complex geometries, thin walls, inserts, and overmolding are possible.

• Consistency: Every part matches the previous one, ensuring reliability in assembly.

? Pain point solved: Many buyers worry about tooling costs. In reality, shared-mold or rapid-mold solutions can cut upfront investment by 30–50%.

7 Swords Precision: Your Trusted Partner in Custom CNC Machining

As a leading provider of custom CNC machining parts and components, 7 Swords Precision specializes in prototype turning and milling using high-quality metal materials. We deliver precision-engineered products tailored to the unique requirements of various industries. Our commitment to excellence has established us as one of the top CNC manufacturing suppliers in the market.

CNC Milling Processing

Our CNC milling services can produce highly accurate and complex parts from a variety of materials, including metals, plastics, and composites
Machinery Axis: 3,4,5,6
Tolerance:+/- 0.01mm
Special Areas :+/-0.005mm
Surface Roughness: Ra0.1~3.2
Supply Ability:300000Piece/Month

CNC Turning Processing

OEM&ODM
Customized Precision Parts

1-Piece minimum order

3-Hour quotation

Samples: 1-3Days

Lead time: 7-14 Days

QC team, inspection
Report Guarantee:
Lifetime After-Sales Service

Certificate:Medical, Aviation, Automobile

ISO13485, IS09001, AS9100, IATF16949

We are proud to hold several production certificates for our CNC machining services, which demonstrates our commitment to quality and customer satisfaction. Our team follows strict quality control procedures to ensure that every part we produce meets the highest standards of quality and accuracy

 

1. ISO13485:MEDICAL DEVICES QUALITYMANAGEMENT SYSTEM CERTIFICATE

2. ISO9001:QUALITY MANAGEMENT SYSTEMCERTIFICATE

3. IATF16949, As9100, SGS2, CE, CQC, ROHS

Our Service

Processing	CNC Turning, CNC Milling, Laser Cutting, Bending, Spining, Wire Cutting, Stamping, Electric Discharge Machining (EDM), Injection Molding
Materials	Aluminum: 2000 series, 6000 series, 7075, 5052, etc
		Stainlesss steel: SUS303, SUS304, SS316, SS316L, 17-4PH, etc
		Steel: 1214L/1215/1045/4140/SCM440/40CrMo, etc
		Brass: 260, C360, H59, H60, H62, H63, H65, H68, H70, Bronze, Copper
		Titanium: Grade F1-F5
		Plastic: Acetal/POM/PA/Nylon/PC/PMMA/PVC/PU/Acrylic/ABS/PTFE/PEEK etc
Surface Treatment	Anodized, Bead Blasted, Silk Screen, PVD Plating, Zinc/Nickl/Chrome/Titanium Plating, Brushing, Painting, Powder Coated, Passivation, Electrophoresis, Electro Polishing, Knurl, Laser/Etch/Engrave etc
Tolerance	±0.002 ~ ±0.005mm
Surface Roughness	Min Ra 0.1~3.2

VR

Cutting-edge Precision for Your Manufacturing Needs
Trust the Experts in CNC Machining

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Products Display

Aluminum

Tolerance: +/- 0.01~+/-0.005mm

Material:2024, 5083, 6061, 6063, 7075, etc

Surface treatment: Oxidation, electro-phoresis, sand blasting, electroplating, chemical treatment, painting, hard anodizing, heat treatment, etc

Stainless Steel/Steel/Titanium Alloy

Tolerance: +/- 0.01~+/-0.005mm

Material:

SUS303, SUS304, SS316, SS316L,17-4PH, etc
1214L/1215/1045/4140/SCM440/40CrMo, etc
TA1, TA2/GR2, TA4/GR5, TC4, TC16, TC18, TC21, TC22, TC26, TC118B etc

Surfacetreatment: Electroplating, galvanizing, spraying, oxidation, polishing, spray grinding, passivation, heat treatment, pickling, shot peening, etc

Brass/Copper

Tolerance: +/- 0.01~+/-0.005mm

Material: HPb63, HPb62, HPb61, HPb59, H59, H68, H80, H90, C11000, C12000, C22000, C26000, C28000, C36000 etc

Surface treatment:Electroplating, tin plating, spraying, oxidation, polishing, spray grinding, heat treatment, pickling, shot peening, etc

Plastic

Tolerance: +/- 0.01~+/-0.005mm

Material:Acetal/POM/PA/Nylon/PC/PMMA/PVC/PU/Acrylic/ABS/PTFE/PEEK etc

Surface treatment:Spraying, sand blasting, painting, pickling, alkali cleaning, anodizing, ion implantation, thermal transfer printing, engraving, etc

Surface Treatment

CNC Machined Parts Surface Treatment.

(1) Physical surface treatment: sandblasting, wire drawing, shot blasting, polishing, rolling, polishing, brushing, spraying, painting, powder spraying, silk screen printing, pad printing, water transfer printing, electrophoresis, etc (2) Chemical surface treatment: bluish blackening, Phosphating, pickling, electroless plating, TD treatment, QPQ treatment, carburizing, nitriding, chemical oxidation, passivation, etc (3) Electrochemical surface treatment: anodic oxidation, hard anodic oxidation, electrolytic polishing, electroplating, etc (4) Modern surface treatment: chemical vapor deposition CVD, physical vapor deposition PVD, ion implantation, ion plating, laser surface treatment, etc

Application Field

Factory Show

20+Years CNC Machining

Supply Ability:300,000Pieces/Month

Machinery Axis:3,4,5,6

Tolerance:+/-0.01~+/-0.005mm

Certification:

ISO9001:2015,AS9100D,ISO13485:2016,ISO45001:2018,IATF16949:2016,ISO14001:2015,RoSH,CE etc.

Customer Photos

FAQ

1. Are you a manufacturer or a trading company

We are a factory located in Shenzhen, China, with 20 years of rich experience, covering 6000 square meters. Complete facilities, including 3D quality inspection equipment, ERP system and 40 machines. If necessary, we can provide you with material certificates, sample quality inspection and other reports

2. How to get a quote
Detailed drawings (PDF/STEP/IGS/DWG...), including quality, delivery date, materials, quality, quantity, surface treatment and other information

3. Can I get a quotation without drawings

Can your engineering team draw for my creativity? Of course, we are also glad to receive your samples, pictures or detailed size drafts for accurate quotation

4. Can you provide samples before mass production

Of course, the sample fee is necessary. If possible, it will be returned during mass production

5. What is the delivery date

Generally, the sample lasts for 1-2 weeks and the batch production lasts for 3-4 weeks

6. How do you control quality

(1) Material Inspection - Check material surfaces and approximate dimensions.

(2) First inspection of production - ensure critical dimensions in mass production.

(3) Sampling inspection - check the quality before delivery to the warehouse.

(4) Preshipment inspection - 100% inspection by QC assistant before shipment.

7. After sales service team

If you have any problems after receiving the product, you can provide feedback through voice call, video conference, email, etc. within one month. Our team will provide you with solutions within a week

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