OEM & Custom Special Nuts Manufacturer
We specialize in non-standard fasteners that go beyond the catalog. Whether you need High-Torque Lock Nuts, Special Weld Nuts with ring projections, or custom T-Nuts, we provide the metallurgical expertise and dimensional precision your assembly requires. Materials include Carbon Steel, Alloy Steel, Stainless Steel, Brass, and Aluminum.
Drawing-to-Print & Reverse Engineering
IATF 16949 / ISO 14001 Certified System
Optical Sorting for 0-PPM Quality Targets
PPAP Level 3 Documentation Available
Custom & Turned
Made-to-print special nuts
& bushings from your drawings.
Weld & Lock Tech
Leak-proof weld projections
& vibration-resistant locking.
IATF 16949 Certified
Automotive grade quality
with full PPAP Level 3 docs.
Browse special nuts by function and design.
Navigate our custom capabilities. We combine cold forming efficiency with secondary machining to produce complex geometries like off-center holes, special threads, and knurled surfaces.
Custom Weld Nuts & Spacers
Designed for automated feeding and robust welding. We manufacture round base nuts with sharp ring tips for focused current density, as well as square, D-shape, and oblong weld nuts.
- Round Weld Nuts with Projections/Ring Tips
- Square & Rectangular Weld Nuts
- D-Shape & Off-Center Hole Weld Nuts
- Weld Bushings & Spacers
T-Nuts & Threaded Inserts
High-strength anchor points for wood, plastic, and composite materials. Featuring slab-base designs for stability and knurled bodies for anti-rotation torque resistance.
- Slab Base T-Nuts (Stamped/Cold Formed)
- Pronged Tee Nuts
- Knurled Threaded Inserts
- Blind Rivet Nuts / Clinch Nuts
Cap Nuts & Security Fasteners
Functional protection and tamper resistance. We produce high-profile cap nuts for exposed threads and specialized security nuts with Torx or Star drives to prevent unauthorized removal.
- High-Profile Cap Nuts / Acorn Nuts
- Torx / Star Drive Security Nuts
- Flange Cap Nuts
- Anti-Theft Shear Nuts
Precision Turned Parts & Bushings
For geometries that require tight tolerances or features impossible to cold form. Includes long blind hole bushings, slotted cylindrical nuts (cross dowels), and custom pivot pins.
- Long Blind Hole Bushings
- Slotted Cylindrical Nuts / Cross Dowels
- Custom Collars & Spacers
- Fine Pitch & Left-Hand Thread Nuts
Metallurgical Excellence
Supply Chain Reliability & Batch Control
Our production system is built for OEM reliability. For special automotive and industrial nuts, we maintain strict lot control to ensure every shipment meets your safety standards.
Traceability: Every box is labeled with a unique Lot Number, traceable back to the raw wire rod and heat treatment furnace.
Raw Material Verification: We utilize Spectrometers to verify chemical composition before production begins, ensuring material grades (like SCM435 or Stainless 316) meet specifications.
Logistics: We support FOB, CIF, and DDP terms with export-grade packaging designed to prevent corrosion during sea freight.
Surface Finishes & Heat Treatment
Custom nuts often require specific friction coefficients for automated assembly or high corrosion resistance for outdoor use. We offer a full range of in-house and partner finishing services.
Heat Treatment: Quenching & Tempering (to Class 8/10/12), Carburizing, and Annealing.
Plating & Coating:
Zinc Flake (Geomet/Dacromet): High corrosion resistance (1000h+ SST) without hydrogen embrittlement.
Zinc Plating: Trivalent Clear/Yellow/Black Zinc.
Passivation: For Stainless Steel parts.
Friction Control: Waxing or top-coat sealers to stabilize torque-tension relationships and prevent galling.
Testing, Inspection & Proof Load
As an IATF 16949 certified manufacturer, quality is embedded in our process. We utilize advanced metrology to ensure your special nuts perform under stress.
Key Capabilities:
✔ Proof Load Testing: Verifying the nut’s ability to hold load without stripping.
✔ Optical Sorting: Automated visual inspection machines to screen for thread presence, dimensions, and mix-ups (PPM level control).
✔ Thread Gauging: Go/No-Go testing to verify thread fit (6H/6g or custom).
✔ Hardness Testing: Verification of core and surface hardness (HRC/HV).
Cold Heading & Custom Tooling
We optimize your costs by converting machined parts into Cold Headed parts whenever possible.
Cold Forming: Our multi-station headers allow us to form complex shapes—like flanges, knurls, and non-round bodies—at high speed with minimal material waste. This process also improves the grain flow of the metal, increasing part strength.
Secondary Operations: For features that cannot be formed, we integrate CNC turning, drilling, tapping, and slotting.
Prototyping: We support the R&D phase with rapid prototyping (machined samples) before committing to mass production tooling.
Application Engineering
Materials & Grades for Demanding Environments
We manufacture strictly to your material specifications.
Carbon & Alloy Steel: Low Carbon (1010, 1018) to High Tensile Alloys (35CrMo, 42CrMo). Grades 4, 6, 8, 10, 12.
Stainless Steel: 304 (A2) and 316 (A4) for superior corrosion resistance.
Brass: For electrical applications and decorative finishes.
Aluminum: Lightweight options for aerospace and automotive weight reduction.
Custom Special Nuts Catalog
Explore our curated catalog of engineered fastening solutions. Featuring high-precision Weld Nuts, K-Lock Nuts, and Security Fasteners, with custom manufacturing available for your specific needs.
Engineer’s Toolbox
Technical specifications for weld projections, material grades, and plating standards.
| Design Type | Application Benefit |
|---|---|
| Ring Projection | Provides a 360° leak-proof seal ideal for Fuel/Oil tanks. |
| 3 / 4 Dimples | Standard configuration for DIN 929 & Square nuts. |
| Elongated | Designed for narrow flanges to provide anti-rotation. |
| Material | Grade | Typical Usage |
|---|---|---|
| Carbon Steel | 1008 / 1010 | Standard Weld Nuts (Excellent Formability). |
| Alloy Steel | 35CrMo | Class 10/12 High Strength applications. |
| Stainless | 304 / 316 | Corrosion Resistance & Food Grade. |
| Finish / Plating | SST (Red Rust) | Key Feature |
|---|---|---|
| Zinc Plating (Cr3) | 48 - 96 Hours | Standard economic protection. |
| Zinc Flake (Geomet) | 500 - 1000 Hours | No Hydrogen Embrittlement risk. |
| Zinc Nickel | 720+ Hours | Automotive High-Temp & Extreme protection. |
Engineering Case Studies
Real-world examples of how we translate customer requirements into controllable manufacturing processes, ensuring full traceability and compliance with global standards.
Critical Flange Joint Bolting
(Pressure Equipment)
Grade 12.9 & Hydrogen Embrittlement
(Corrosion Control)
Material & Grade Options
We offer a wide range of raw materials certified to ASTM, DIN, and ISO standards. Material certificates (EN 10204 3.1) are available upon request for all production lots.
Stainless Steel
Excellent corrosion resistance for standard environments. We offer passivation to further enhance durability and clean appearance.
Titanium Alloys
Offers a superior strength-to-weight ratio (60% lighter than steel) with exceptional corrosion immunity.
Duplex Steel
Dual-phase microstructure providing exceptional resistance to Stress Corrosion Cracking (SCC) and pitting in harsh chlorides.
Nickel Superalloys
Extreme high-temperature stability and superior resistance to strong oxidizing acids and creeping.
Request a Quote (Attach Drawing)
Recommended: standard, size list, grade/material, finish, quantity/EAU, destination,documents, and drawing if custom.
Technical FAQ: Special Nuts & Custom Parts
Can you manufacture custom special nuts based on drawings?
Yes. Over 60% of our production is dedicated to non-standard items. We can manufacture special nuts, bushings, and turned parts based on your PDF/CAD drawings. We handle complex geometries including oblong, D-shape, and specific projection designs for welding.
Are your weld nuts and lock nuts IATF 16949 certified?
Yes, our manufacturing facility is IATF 16949:2016 certified. We provide full PPAP Level 3 documentation, IMDS registration, and material certifications (3.1) for all automotive fasteners.
How do I choose between Ring Projection and Dimple welding points?
Ring Projections provide a continuous 360° seal, making them ideal for oil/fuel tanks to prevent leakage. Dimple Projections (3 or 4 points) are better for general structural assembly (DIN 929 type) where sealing is not the primary concern but high torque resistance is required.
When should I use All-Metal Lock Nuts vs. Nylon Insert Nuts?
Use Nylon Insert Nuts (DIN 985) for standard vibration resistance up to 120°C. For high-temperature environments (exhaust systems, engines) or chemical exposure, All-Metal Lock Nuts (Stover/Deformed Thread) are required to maintain locking torque without melting.
What plating options do you offer for high corrosion resistance?
Beyond standard Zinc Plating, we offer Zinc Nickel (720h+ SST) and Zinc Flake (Geomet/Dacromet, 1000h+ SST). Zinc Flake is highly recommended for Grade 10/12 high-strength nuts to eliminate the risk of hydrogen embrittlement.
What is the MOQ for custom turned parts?
For custom turned parts or special cold-forged nuts, our typical MOQ is 10,000 to 50,000 pieces depending on the complexity and tooling requirements. We can provide prototype samples for validation before mass production.