Custom Metal Fasteners Manufacturer
For over 30 years, Prime has been an ISO 9001-certified manufacturer of custom metal fasteners. We produce non-standard bolts, nuts, screws, and washers to your exact drawings or samples. Using our dedicated fastener production lines, we deliver consistent quality, competitive pricing, and on-time shipment to clients across North America, Europe, and global markets.
Custom made metal fasteners
In industrial manufacturing, construction engineering, automotive assembly, and other critical applications, every fastener directly impacts performance and safety. We supply custom metal fasteners engineered precisely to your specifications—ensuring perfect fit, reliable clamping force, and long-term durability in your assemblies.
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Your Trusted Partner for Industrial Fasteners
Quality You Can Rely On
Our ISO 9001 certification is your guarantee of quality. We implement rigorous quality control from raw material inspection to final product testing, ensuring every fastener meets the highest industry standards for strength and durability.
Fully Customized to Your Needs
Standard parts don't always fit. We excel at manufacturing custom fasteners based on your drawings, samples, or specific requirements, including unique dimensions, threads, head types, and materials.
Competitive Pricing & Flexible MOQ
As a direct manufacturer, we eliminate middlemen to offer you the best possible price. We support projects of various sizes and are flexible on Minimum Order Quantity (MOQ) for long-term partners.
Fast & On-Time Delivery
With multiple dedicated production lines for fasteners, we ensure your order is manufactured and shipped on schedule, helping you avoid costly project delays.
Our Custom Fastener Capabilities
Metal fasteners can be divided into several main types according to different processes, and each process has different characteristics and application fields. The following are some common fastener processes and their features and applications:
Custom Screws
We manufacture machine screws, self-tapping screws, and set screws in various materials and drive types. Tell us your requirements for a high-performance, custom-fit solution.
- Applications:Widely used in electronic equipment, automobile manufacturing, mechanical equipment, construction and other fields, especially for the need for high-strength connection industries.
Custom Nuts
From standard hex nuts and lock nuts to custom-designed flange nuts and wing nuts, we manufacture high-precision nuts that ensure secure fastening for your application.
- Applications:Commonly used in mechanical assembly, automotive industry, building structures, home appliances, equipment and other fields, especially suitable for the need to firmly fasten the environment.
Custom Bolts
We produce a wide range of custom bolts, including hex bolts, carriage bolts, flange bolts, and specialty bolts. Provide us with your specifications for head style, thread type, length, and material.
- Application:Common in heavy machinery, building structures, bridge construction, energy fields and other high-intensity demand scenarios, especially for long-term use of the connection point.
Custom Washers & Other Parts
Beyond standard fasteners, we also produce custom washers, pins, rivets, and other small metal components to complete your assembly needs.
- Application:Widely used in automobiles, mechanical equipment, electrical devices and other fields, especially in high vibration environment, to prevent fasteners loose and wear.
Materials & Surface Finishes
A quick, engineer-friendly reference for selecting fastener materials and coatings based on strength, corrosion resistance, appearance, and compliance. Use the filter to search by grade, standard, or finish.
Fastener Material Selection
Typical options for bolts, screws, studs, nuts, washers & special fasteners.
| Material Family | Common Grades / Standards | Best For | Compatible Finishes | Notes |
|---|---|---|---|---|
| Carbon Steel | ISO 898-1 (4.8 / 8.8 / 10.9), ASTM A307, SAE J429 | General machinery, structural assemblies, cost-sensitive builds | Zinc plating, Zinc-Nickel, Black oxide, Phosphate, Zinc flake | Balance cost & strength; protect from corrosion |
| Alloy Steel | ISO 898-1 (10.9 / 12.9), ASTM A325/A490 (structural), custom heat-treat | High-strength joints, impact/vibration loads, automotive & equipment | Zinc-Nickel, Zinc flake, Phosphate + oil, Black oxide | Hydrogen embrittlement control for high strength |
| Stainless Steel | ISO 3506 (A2/A4), ASTM F593 / F594, 304 / 316 / 410 | Outdoor, marine, chemical exposure, clean appearance | Passivation, Electropolish, PTFE, PVD (decorative) | 316/A4 for chloride environments; watch galling |
| Brass | C360/CW614N (typical), custom brass alloys | Electrical, low-spark, decorative, good machinability | Nickel plating, Chrome (decorative), clear lacquer | Not for very high strength; consider stress cracking risks |
| Aluminum | 6061 / 5052 (typical), custom grades | Lightweight assemblies, non-magnetic, corrosion-friendly builds | Anodizing (Type II/III), powder coating | Lower strength than steel; avoid galvanic couples |
| Titanium | Grade 2 / Grade 5 (Ti-6Al-4V) | High strength-to-weight, marine, aerospace, premium hardware | Passivation/cleaning, PVD (color), shot peen | Excellent corrosion resistance; higher cost/lead time |
| Plastics / Nylon | Nylon, PEEK, PPS (for special fasteners) | Electrical insulation, chemical resistance, lightweight fixtures | — | Temp/creep limits; specify load + environment carefully |
Surface Finishes & Coatings
Choose corrosion protection, appearance, and assembly performance.
| Finish / Treatment | Typical Standard | Corrosion Level | Appearance | When to Choose |
|---|---|---|---|---|
| Zinc Plating (clear/blue, yellow) | ASTM B633 / ISO 4042 | Good (indoor / mild) | Bright metallic | General hardware, cost-effective protection |
| Zinc-Nickel (Zn-Ni) | OEM specs / ISO 19598 (common reference) | Very Good | Silver/gray | Automotive under-hood, higher salt-spray targets |
| Zinc Flake (Geomet/Dacromet-type) | ISO 10683 | Very Good | Matte gray | High-strength fasteners; lower embrittlement risk |
| Black Oxide | Military/OEM specs (varies) | Basic | Deep black | Appearance, low reflection; use with oil for protection |
| Phosphate (Mn/Zn) + oil | ASTM D769 (common reference) | Good | Dark gray | Improves lubrication, torque control; automotive & machinery |
| Hot-Dip Galvanizing | ASTM A153 / ISO 1461 | Excellent (outdoor) | Thick zinc, rough | Outdoor steel structures; allow for coating thickness on threads |
| Passivation (Stainless) | ASTM A967 / ASTM A380 | Restores SS resistance | Clean metallic | Removes free iron; recommended after machining |
| Electropolishing (Stainless) | ASTM B912 | High (SS) | Bright, smooth | Hygienic/clean applications; improves surface finish |
| PTFE / Dry-Film Lubricant | OEM specs (friction-controlled) | Depends on base | Colored/film | Stable torque, anti-galling, controlled friction (K-factor) |
| Anodizing (Aluminum) | MIL-A-8625 (Type II/III) | Good–Excellent | Various colors | Wear + corrosion protection for aluminum fasteners |
The Process Flow & Duration Estimation
The production process of metal fasteners is a precise engineering involving multiple steps, each of which is crucial to ensure the quality and performance of the final product. The following are the main steps in the production of metal fasteners:
Step 1: Preparation of raw materials
The production of metal fasteners begins with the sourcing of high-quality raw materials. Common raw materials include stainless steel, carbon steel, aluminum alloy, etc. . These materials are usually subjected to a rigorous screening process to ensure that they meet the required specifications and standards.
Step 2: Cutting and shaping
In this step, the raw material is cut to the desired length or shape. Cutting is usually done mechanically or by laser to ensure accuracy and consistency. Subsequently, the material is fed into forming equipment, such as stamping machines, thread rolling machine, etc. , a preliminary molding treatment.
Step 3: Heat Treatment
In order to improve the strength and durability of metal fasteners, many metal materials need to be heat treated. The heat treatment process includes heating, quenching and tempering to change the structure of the material and improve its hardness and tensile strength.
Step 4: Surface treatment
In order to enhance the corrosion resistance and aesthetics of metal fasteners, surface treatment is essential. Common surface treatment methods include zinc plating, plastic spraying, phosphating, electroplating and so on. These treatments can effectively prevent metal surface rust or wear, and prolong service life.
Step 5: Machining and cutting
After heat treatment and surface treatment, metal fasteners into the finishing stage. This stage includes thread processing, hole processing, end trimming, etc. , to ensure that the size of fasteners and threads meet the design requirements.
Step 6: Quality inspection
In the production process, strict quality control is an indispensable link. Each batch of production will be subject to detailed inspection, including dimension, strength, thread accuracy, surface quality and other aspects of testing to ensure that the products meet international quality standards.
Step 7: Packaging and shipping
After all production and inspection work is completed, the metal fasteners are cleaned, packed and ready for shipment. According to customer requirements, fasteners can be classified and packaged by batch, model, size, etc. to ensure safety and convenience during transportation.
Step 8: Delivery of finished product
Upon completion of all inspection and post-processing, the castings will become the final product, ready to be delivered to the customer or used for assembly.
Want to know how to compress lead times?
In order to shorten the production and delivery cycle, we suggest that you tell us your needs in detail, and we will adjust the strategy flexibly according to your requirements to ensure your production and help you succeed!
From corrosion resistance to consistent torque performance, finishing is what makes a screw “production-ready”. We support small batches to mass production with stable appearance and measurable coating control.
Surface Treatments That Protect Threads, Improve Assembly, and Look Consistent
PRIME provides end-to-end finishing for custom metal screws and fastener parts: pretreatment, coating, post-bake, inspection, and export packaging—aligned to your specs.
Tip: If your screw is high-strength steel, tell us the grade/class and the corrosion target (e.g., salt spray hours), so we can confirm plating + baking requirements (hydrogen embrittlement control).
Zinc / Zinc-Nickel Plating
Reliable corrosion protection with good cost-performance.
Black Oxide / Phosphate
Low build-up, keeps thread geometry sharp, improves oil retention.
Passivation / Dry Film / PTFE
Cleaner surfaces, better assembly feel, and stable torque behavior.
Finishing Flow (Thread-Safe)
-
1Pretreatment Degreasing → rinsing → mild activation. Removes oil/oxide without damaging thread profile.
-
2Masking / Racking For critical thread class or bearing faces: selective masking + stable racking to avoid marks.
-
3Coating / Treatment Plating / oxide / passivation / dry film per drawing and performance target.
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4Post-Bake (If Required) Hydrogen embrittlement relief for high-strength steels after plating—time/temperature controlled.
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5Inspection + Documentation Thickness, appearance, adhesion, thread fit, and optional torque-tension / salt spray reports.
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6Packaging Anti-rust protection, labeled lots, and export-ready cartons to keep finish stable during shipping.
How do you prevent coating build-up that affects thread fit?
We manage racking orientation, thickness targets, and (when needed) masking on functional thread zones. For tight tolerance threads, we recommend finishes with controlled build-up and confirm thread gauges after finishing.
Can you match a specific color or appearance standard?
Yes. Provide a standard (or sample) for confirmation. We can align to common appearance expectations by controlling pretreatment, topcoat type, sealing, and post-rinse drying.
Do you support compliance requirements like RoHS / REACH?
We can use compliant finishing options and provide related documents when requested. Tell us your market and any restricted substances list.
What information should I include in an RFQ for surface finishing?
Material + strength grade, finish type (or performance target), corrosion requirement (e.g., salt spray hours), functional areas (threads/bearing faces), and any required test reports.
| Requirement | Recommended Finish | Notes |
|---|---|---|
| General outdoor corrosion protection | Zinc plating + passivation | Good balance of cost and protection; thickness control matters for thread fit. |
| Higher corrosion performance / automotive use | Zinc-Nickel + topcoat | Stable performance; confirm torque behavior if needed. |
| Low build-up, keep threads sharp | Black oxide / phosphate | Often used with oil/seal for improved corrosion resistance. |
| Stainless steel corrosion improvement | Passivation | Clean surface; verify grade (304/316/other) and application environment. |
| Assembly feel & anti-galling | Dry film / PTFE coating | Helps repeatable tightening; optional torque-tension validation. |
All finishes can be customized based on your drawing, environment, and assembly needs. If you’re unsure, send a photo/sample or tell us the application—we’ll propose 2–3 finish stacks with pros/cons.
The Common Pitfalls When Purchasing
Please note that the final cost depends on the customized service you require, the specifications of the raw materials used, the relevant national laws, and the distance of transportation. Take the example of booking a tall container of products:
- Improper material selection: improper material selection may lead to fasteners can not reach the strength, corrosion resistance and other performance requirements, affecting the service life.
- Poor design: immature design can lead to fastener production difficulties, increased costs, and delivery delays.
- Supplier is not reliable: some unprofessional suppliers may not be strict in quality control, resulting in substandard products or delivery is not timely.
Our Certificate
Third-party verification supports supplier approval. Below are our ISO 9001 certificate, SGS test report, and CNIPA utility model patents. If you need a PDF copy for internal review, tell us which document you require.
Frequently Asked Questions about Custom Metal Fasteners
What types of custom metal fasteners can you manufacture?
We produce custom screws, bolts, studs, nuts, washers, and special formed fasteners—including non-standard heads, shoulder features, captive washer designs, and combined stamped + machined parts.
What materials are available for custom fasteners?
Common options include carbon steel, alloy steel, stainless steel (304/316), brass, and aluminum. We can manufacture to ASTM / DIN / ISO / JIS requirements or per drawing.
Can you make metric and imperial threads?
Yes. We support Metric (M), UNC/UNF, and other thread standards as specified. Thread quality can be verified with GO/NO-GO gauges and inspection reports when needed.
What surface finishes or coatings do you offer for corrosion resistance?
Typical finishes include zinc plating, zinc-nickel, nickel plating, black oxide, phosphate, and passivation (stainless). We can control coating thickness and recommend the best option for your environment.
How do you ensure quality (FAI, inspection, traceability)?
We can provide first article inspection (FAI), dimensional reports, material certificates (MTC), hardness testing, and coating thickness reports. For critical parts, we align inspection to your CTQs and sampling plan.
What information should I include in an RFQ to get an accurate quote?
Send 2D drawing (PDF) + 3D (STEP), material/standard, thread spec, finish, tolerances/CTQs, quantities (prototype + annual), application environment, and packaging requirements. This helps us quote faster and avoid rework.
A Brief Self-Nomination, Why Choose Prime?
Choose Us, and you will get affordable, high-quality, on-time delivery of metal fasteners solutions.
Experience: We have more than 30 years of metal fastener production experience, can provide high-quality customized metal fasteners for various industries.
Professional team: Our Engineering team is familiar with metal fastener technology and can provide precise design and production services.
Quality assurance: WE are ISO 9001 certified to ensure that each fastener meets the highest standards of quality.
Rapid Response: We are committed to providing fast sample production and production cycle, to ensure that your needs can be met in a timely manner.
Global Services: No Matter where you are, we can provide you with quality services to ensure the smooth progress of your business.
Your Trusted Resource for Metal Parts Sourcing
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Get in touch
Custom Hardware Parts Made Easy
Tell Us Your Requirements
Share detailed information about your needs, including drawings, reference images, and any specific ideas or specifications you have in mind.
Receive Tailored Solutions & Quote
Based on your requirements and design, we’ll provide a custom solution and send you a detailed quote within 24 hours.
Approve for Production
Once you approve the design and quote, we’ll begin mass production and take care of the shipping, ensuring timely delivery.
Get a Free Quote
Reach out to us for a free quote and expert advice on your custom hardware needs. At Prime, we’ll provide the right solution for your project, ensuring quality and precision every step of the way.