Ever spent hours hunting for the perfect custom parts supplier, only to end up more confused than when you started? You’re not alone. With so many factories promising top-notch quality, on-time delivery, and unbeatable prices, choosing the right partner feels overwhelming. Finding the best manufacturer isn’t just about price—it’s about reliability, craftsmanship, and peace of mind. Imagine smoother projects, fewer headaches, and products you can truly trust.

Ready to discover the top custom parts factories and make your next choice with confidence? Let’s dive in!

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The World’s Largest Custom Manufacturing Marketplace – MFG

Product Details:
MFG is an online manufacturing marketplace connecting buyers seeking custom parts with a global network of manufacturers. The platform enables users to submit RFQs (Requests for Quotes) for processes including CNC machining, 3D printing, engineering and design services, injection molding, sheet metal fabrication, stamping, and fabrication. MFG provides tools to manage supplier communications, quotes, payments, and order tracking from a single platform.

Technical Parameters:
– RFQ submission system with automatic NDA protection
– Supports multiple manufacturing technologies: 3D Printing (SLA, SLS, Binder
– Integrated manufacturer directory and quoting interface
– Order management system with live status updates and secure payment processing

Application Scenarios:
– Prototyping and sourcing custom parts for engineering projects
– Production runs requiring multiple manufacturing processes (e.g., sheet metal
– Small businesses or enterprises needing to compare manufacturing quotes quickly
– Organizations seeking vetted suppliers for defense, automotive, or industrial

Pros:
– Single submission of RFQ provides access to a broad manufacturer network and
– Free-to-use platform for buyers
– Integrated platform streamlines communication, quoting, order tracking, and
– NDAs available to protect intellectual property

Cons:
– No disclosed technical details or tolerances for supported manufacturing
– Platform effectiveness limited by the quality and responsiveness of the
– May not be suitable for projects requiring in-person supplier interaction

Summit Racing | Aftermarket Parts & Accessories, Performance Parts, OEM …

Product Details:
Summit Racing offers a wide range of aftermarket and OEM automotive parts and accessories for performance, restoration, stock replacement, tools, clothing, gifts, and more. Products are organized by vehicle type and enthusiast interests such as Truck/SUV, Jeep, Restoration, Circle Track, Street Rod, Powersports, Marine, and Jr Dragster. The site also provides a rewards program, branded payment card, gift cards, and a mobile app for additional savings.

Technical Parameters:
– Parts compatible with specific vehicle makes, models, and engines via detailed
– Offers both OEM and aftermarket performance parts.
– Product categories include stock replacement, restoration components, tools,
– Mobile app enables additional discounts on purchases.

Application Scenarios:
– Vehicle performance upgrades for muscle cars, trucks, SUVs, Jeeps, and
– Restoration of classic or vintage vehicles.
– General maintenance and stock part replacements.
– Customization and accessorizing with gifts, clothing, and memorabilia.

Pros:
– Extensive selection of parts for various vehicle types and enthusiast niches.
– Potential for discounts via mobile app, special offers, and rewards program.
– Easy parts search by vehicle, make, model, or engine to ensure compatibility.
– Multiple customer support and self-service options (order status, returns, wish

Cons:
– No specific technical specifications for individual products are listed on the
– Selection may be overwhelming for beginners without advanced automotive
– Full pricing and detailed part data require account sign-in or further
– Promotions and savings may require additional app download or enrollment in

Custom Precision Parts & Components Manufacturing – WM Berg

Product Details:
WM Berg specializes in the manufacturing of custom precision parts and components, including assemblies, belts, chains, sprockets, pulleys, shafting, precision bearings, couplings, gears, hardware, and fasteners. They offer both standard and custom solutions for gearing, drive, and motion control applications.

Technical Parameters:
– Precision engineered components such as gears, sprockets, pulleys, bearings,
– Variety of product sub-types including anti-backlash gears, helical gears,
– Available in both custom and standard configurations with options for

Application Scenarios:
– Automation and robotics requiring precise mechanical motion
– OEM machinery and industrial equipment involving power transmission
– Aerospace, defense, and laboratory equipment necessitating custom mechanical

Pros:
– Wide selection of specialized precision components and assemblies
– Capability for custom part design and manufacturing tailored to client
– Comprehensive service offerings including machining, quality assurance, and

Cons:
– Technical specifications and tolerances for specific products not explicitly
– Potential lead time and cost considerations for custom manufacturing

Custom Parts Manufacturing & Sourcing Platform | Jiga

Product Details:
Jiga is a custom parts manufacturing and sourcing platform offering on-demand production services that include CNC machining, sheet metal fabrication, 3D printing, and injection molding. The platform also provides solutions for quoting, order tracking, team and supplier collaboration, and supplier management.

Technical Parameters:
– CNC Machining: CNC Milling, CNC Turning
– Sheet Metal Fabrication: Bending, Cutting
– 3D Printing: Fused Deposition Modeling (FDM), Selective Laser Sintering (SLS),
– Injection Molding: Plastic Injection Molding, Overmolding, Insert Molding

Application Scenarios:
– Prototyping and low-volume manufacturing
– Mass production of custom mechanical parts
– Rapid iteration for product development
– Collaborative part sourcing and supplier management

Pros:
– Wide range of manufacturing processes available on a single platform
– Integrated quoting, order tracking, and supplier collaboration tools
– Facilitates fast turnaround from prototyping to mass production
– Simplifies RFQ, contract, and supplier management processes

Cons:
– No explicitly detailed materials, tolerances, or industry certifications on the
– Potential limitations or lack of information on geographic manufacturing

CNC Manufacturing, Fast Quotes & Free CAD | eMachineShop

Product Details:
eMachineShop offers custom manufacturing services including CNC machining, sheet metal fabrication, injection molding, 3D printing, surface finishing, and secondary processes. They also provide free CAD software for custom part design and fast quoting, serving both prototypes and production quantities for metal and plastic parts.

Technical Parameters:
– Precision milling and turning for metals and plastics (CNC machining)
– Over 50 material options available (metals and plastics)
– Tight tolerances and quick turnaround times
– Surface finishes include powder coating, anodizing, electroplating, brushing,

Application Scenarios:
– Prototyping new parts and assemblies
– Small to large production runs for custom components
– Manufacturing plastic and metal components for various industries
– Rapid, on-demand fabrication for engineers, businesses, and individuals

Pros:
– No minimum or maximum order quantity—prototype to production supported
– Free, easy-to-use CAD software offered
– Comprehensive quality control and responsive customer support
– Free ground shipping within the continental USA

Cons:
– Services may be limited to users able to provide or create CAD files
– Instant quoting limited to users of their own CAD software for full automation

PARTMFG | Custom Manufacturing & CNC Parts Supplier

Product Details:
Custom manufacturing of precision plastic and metal parts, offering services including CNC machining, sheet metal fabrication, 3D printing, and surface finishing, from prototyping to production. The company is ISO 9001:2015 and ISO 13485:2016 certified and supplies high-tolerance parts to various industries.

Technical Parameters:
– CNC machining capabilities: milling, turning, 5-axis machining, precision and
– Works with a range of materials: metals, plastics, ceramics, carbon fiber,
– Certified to ISO 9001:2015 and ISO 13485:2016 standards.

Application Scenarios:
– Medical devices manufacturing
– Aerospace and defense component production
– Automotive and electrical part supply
– Consumer and sporting goods prototyping and production

Pros:
– Average cost savings of 30%
– Fast global delivery within 3 days
– Over 15 years of global market and design experience
– Serving over 2,000 customers in more than 30 countries

Cons:
– Main manufacturing is based in China, which could imply longer shipping times
– No specific technical tolerances or maximum/minimum production capabilities

CARDONE Industries | Top Aftermarket Auto Parts Manufacturer

Product Details:
CARDONE offers remanufactured and new automotive parts and components for a wide range of vehicles, focusing on both replacement and performance upgrades.

Technical Parameters:
– Original Equipment (OE) fit and function for most products
– Parts remanufactured to meet or exceed OE specifications
– Available for domestic and import cars, trucks, and SUVs
– Includes complex assemblies such as brake calipers, steering racks, and

Application Scenarios:
– Automotive repair and maintenance shops replacing faulty components
– Vehicle owners seeking cost-effective, sustainable parts
– Fleet maintenance for extending vehicle life
– Performance upgrades and component replacements for improved vehicle efficiency

Pros:
– Cost-effective alternative to new OE parts
– Environmentally friendly remanufacturing process
– Wide coverage for domestic and import vehicles
– Products engineered for OE fit and function

Cons:
– Some remanufactured parts may have perceived lower reliability compared to
– Availability may vary depending on make and model
– Limited lifetime warranties on certain products

Custom Components to Your Specifications | MW Components

Product Details:
MW Components offers custom-manufactured components to precise customer specifications, including springs, fasteners, bellows/couplings, precision components, shims, threaded inserts, spring energizer products, and wire forms. Products cater to a wide range of size, configuration, and material requirements, and can be tailored for unique or high-performance applications.

Technical Parameters:
– Manufacture of custom springs (compression, extension, torsion, machined, flat,
– Production of custom fasteners (bolts, rivets, screws, threaded inserts,
– Precision bellows, couplings, shims, spring energizer products (canted coil,
– Material and specification options including NAS/MS/mil-spec, custom geometries

Application Scenarios:
– Aerospace and defense components requiring certified fasteners and precision
– Automotive manufacturing involving specialty springs and precision fasteners
– Industrial machinery needing shims, couplings, and spring energizer products
– Custom OEM projects needing unique part geometries or high-performance materials

Pros:
– Wide range of product customization for dimensions, material, and standards
– Capability to deliver specialty, high-performance, and made-to-specification
– Large catalog covering diverse component categories for consolidated sourcing
– Support and resources available (engineering calculators, technical data,

Cons:
– Website navigation may be complex due to extensive product categories and links
– Details about lead times, minimum order quantities, and pricing are not

Atech Motorsports | Wholesale Car & Truck Parts Distributor

Product Details:
Atech Motorsports is a global wholesale distributor offering millions of car and truck parts from over 1,600 top brand names, serving various automotive categories such as truck, Jeep, offroad, high performance, late model, Detroit muscle, European, restoration, stock replacement, and tools & shop equipment.

Technical Parameters:
– Same day shipping for orders placed by 7 PM EST
– Reliable 1–2 day delivery available 6 days a week
– Products available from over 1,600 top brand names
– Customer service available in English, Spanish, Portuguese, Italian, and French

Application Scenarios:
– Wholesale supply for automotive shops and dealers
– Performance and specialty automotive upgrades
– Restoration projects for classic and late model vehicles
– General parts replacement and repair for cars and trucks

Pros:
– Extensive inventory with millions of parts in stock
– Fast shipping options, including same day shipping
– Multilingual customer service
– No stock requirement for dealers (‘We stock it, so you don’t have to’)

Cons:
– No specific product fitment or compatibility details listed directly
– Wholesale focus may not cater to individual retail customers

Custom Mechanical Parts from Prototypes to Production | OEM – Zintilon

Product Details:
Custom mechanical parts manufacturing, from prototypes to production, utilizing CNC machining, sheet metal fabrication, metal casting, EDM machining, metal etching, rapid tooling, and offering solutions for rapid prototyping, low volume production, and various surface finishing processes.

Technical Parameters:
– Tolerance down to 0.001mm for precision parts
– Selection from 50+ metals and plastics
– 30+ surface finishing options
– Certified to standards such as ISO 9001:2015, IATF 16949, ISO 13485:2016,

Application Scenarios:
– Aerospace: high precision, high strength parts
– Automotive: wear-resistant, lightweight components
– Medical: smooth and highly precise parts
– Robotics, Automation, Consumer goods, New energy, and Semiconductor

Pros:
– Comprehensive range of manufacturing techniques and services
– Ability to handle both rapid prototyping and low volume production
– High-precision manufacturing with broad material and surface finishing choices
– International quality certifications (ISO, IATF, AS)

Cons:
– Specialization in custom and precision parts may not suit high-volume,
– Limited information on maximum size, weight limits, or production speed for

Comparison Table

Company	Product Details	Pros	Cons	Website
The World’s Largest Custom Manufacturing Marketplace – MFG	MFG is an online manufacturing marketplace connecting buyers seeking custom	Single submission of RFQ provides access to a broad manufacturer network and	No disclosed technical details or tolerances for supported manufacturing	www.mfg.com
Summit Racing	Aftermarket Parts & Accessories, Performance Parts, OEM …	Summit Racing offers a wide range of aftermarket and OEM automotive parts and	Extensive selection of parts for various vehicle types and enthusiast niches	No specific technical specifications for individual products are listed on the
Custom Precision Parts & Components Manufacturing – WM Berg	WM Berg specializes in the manufacturing of custom precision parts and	Wide selection of specialized precision components and assemblies Capability	Technical specifications and tolerances for specific products not explicitly	www.wmberg.com
Custom Parts Manufacturing & Sourcing Platform	Jiga	Jiga is a custom parts manufacturing and sourcing platform offering on-demand	Wide range of manufacturing processes available on a single platform Integrated	No explicitly detailed materials, tolerances, or industry certifications on the
CNC Manufacturing, Fast Quotes & Free CAD	eMachineShop	eMachineShop offers custom manufacturing services including CNC machining,	No minimum or maximum order quantity—prototype to production supported Free,	Services may be limited to users able to provide or create CAD files Instant
PARTMFG	Custom Manufacturing & CNC Parts Supplier	Custom manufacturing of precision plastic and metal parts, offering services	Average cost savings of 30% Fast global delivery within 3 days Over 15 years of	Main manufacturing is based in China, which could imply longer shipping times
CARDONE Industries	Top Aftermarket Auto Parts Manufacturer	CARDONE offers remanufactured and new automotive parts and components for a	Cost-effective alternative to new OE parts Environmentally friendly	Some remanufactured parts may have perceived lower reliability compared to
Custom Components to Your Specifications	MW Components	MW Components offers custom-manufactured components to precise customer	Wide range of product customization for dimensions, material, and standards	Website navigation may be complex due to extensive product categories and
Atech Motorsports	Wholesale Car & Truck Parts Distributor	Atech Motorsports is a global wholesale distributor offering millions of car	Extensive inventory with millions of parts in stock Fast shipping options,	No specific product fitment or compatibility details listed directly Wholesale
Custom Mechanical Parts from Prototypes to Production	OEM – Zintilon	Custom mechanical parts manufacturing, from prototypes to production, utilizing	Comprehensive range of manufacturing techniques and services Ability to handle	Specialization in custom and precision parts may not suit high-volume,

Frequently Asked Questions (FAQs)

How do I find reliable custom parts suppliers or manufacturers?

Start by searching online marketplaces, industry directories, or attending trade shows. Ask for recommendations from industry contacts. Always check company reviews and request references from previous clients to assess their reputation and reliability.

What factors should I consider when choosing a supplier?

Key factors include product quality, pricing, production capacity, lead times, communication responsiveness, and experience with your specific type of part. Also, ensure they meet relevant certifications or quality standards for your industry.

How can I verify a manufacturer’s credibility?

Review their business licenses, certifications, and client references. Request product samples and conduct a site visit if possible. You can also look for third-party audits or quality inspection reports to confirm their operational standards.

What information should I provide to get an accurate quote?

Be clear about your part’s specifications (materials, dimensions, tolerances), quantities, design files or drawings, required certifications, packaging needs, and shipping destination. The more detail you provide, the more accurate your quote will be.

How do I handle communication and avoid misunderstandings?

Establish clear communication channels and use detailed written agreements outlining expectations. Confirm all technical details and timelines in writing. Regular updates and prompt responses help prevent confusion and ensure a smooth collaboration.