Manufactured by Ningbo Junwei Trading Co., Ltd., a specialized wheel fastener factory with over 20 years of production history, J&W Auto Parts M12x1.5 Bulge Acorn Wheel Lug Nuts combine cold-heading density, automated thread precision, and verified surface treatment to deliver a reliable, long-lasting wheel connection.
Evidence-Backed Performance: Each production lot undergoes mandatory 72-hour salt spray testing per QC/T 625-2013. SGS and TÜV test reports — with report numbers and dates — are available on request.
Cold-Forged Structural Integrity: The one-piece cold-heading process preserves uninterrupted metal grain flow, achieving a stable 8.8 hardness grade (verified by Rockwell and Vickers testing on every batch). Material utilization exceeds 80%, contributing to consistent clamping reliability.
Controlled Thread Tolerance: Threads are produced on fully automated tapping machines with class 6H fit tolerance. This helps reduce the risk of cross-threading and contributes to smoother installation feel when the nut is started by hand.
Flexible Surface Finishing with Verified Corrosion Resistance: Choose from chrome plating, electrophoretic coating (custom colors), or Dacromet — all applied in our in-house automated line and validated by salt spray and coating adhesion tests.
Global Supply, Local Support: We ship to over 30 countries, with 60% of exports to North America. Standard payment terms: T/T 30% deposit, balance before shipment. FOB Ningbo or EXW. MOQ as low as 2 boxes for stock specifications.
The nut is formed from a single steel blank in a cold-heading die, which preserves the natural fiber flow of the metal. After controlled heat treatment, the surface hardness falls within the range of HRC 22–34 (8.8 grade). This design is intended to maintain clamping integrity under specified installation torque and normal service loads, and to resist permanent deformation better than multi-piece or stamped alternatives.
Each M12x1.5 Bulge Acorn Wheel Lug Nut undergoes fully automatic tapping, delivering a thread pitch tolerance that meets class 6H standards. The result is a consistent thread engagement that helps reduce galling and installation resistance. During our batch inspection, every nut is checked with Go/No-Go thread gauges, and any deviation leads to immediate line adjustment.
Our automated plating and coating lines apply:
Chrome Plating (silver): High gloss, tested to 72h NSS per QC/T 625-2013.
Electrophoretic Coating (black, red, custom): Uniform matte finish, good chip resistance.
Dacromet (silver-gray): Zinc-aluminum flake coating offering extended corrosion protection in heavy-duty applications.
Test reports from SGS and TÜV are part of our technical documentation package. You can request a copy before placing your order.
The 60° conical bulge seat provides a larger bearing surface against the wheel’s lug hole, which helps distribute clamp load and reduces the risk of damage to aluminum or painted wheels. Available hex sizes: 17mm, 19mm (standard), 21mm, 22mm, 24mm, matching common socket sets without the need for special tools.
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Parameter |
Specification |
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Product Name |
M12x1.5 Bulge Acorn Wheel Lug Nuts |
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Brand / Model |
J&W Auto Parts JLN001 |
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Material |
High-strength carbon steel (standard); Stainless steel (optional) |
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Thread Size |
M12 x 1.5, class 6H fit tolerance |
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Hex Size |
17mm, 19mm, 21mm, 22mm, 24mm (others customizable) |
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Overall Length |
32 mm (1.28 in) |
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Seat Type |
60° conical bulge acorn |
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Forming Process |
Cold heading integrated forming |
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Hardness Grade |
8.8 (HRC 22–34 surface, verified per batch) |
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Surface Treatments |
Chrome plating, Electrophoresis (custom colors), Dacromet |
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Salt Spray Endurance |
≥72 hours, QC/T 625-2013 (SGS/TÜV certified, reports available) |
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MOQ |
2 boxes (standard specs); negotiable for custom orders |
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Warranty |
12 months against manufacturing defects (installation must follow torque specs) |
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Certifications |
SGS, TÜV (test report copies provided upon request) |
To support our technical claims, we maintain batch-level quality records and third-party certifications. Below is a summary of our standard compliance documentation. Actual reports can be shared during the inquiry process.
Salt Spray Test (per QC/T 625-2013):
Test solution: 5% ±1% NaCl
pH: 6.5–7.2
Chamber temperature: 35°C ±2°C
Duration: 72 hours continuous spray
Acceptance criteria: No red rust, no blistering on tested samples
Typical result: Pass (verified on chrome, e-coat, and Dacromet samples)
SGS/TÜV Reports Available: We hold valid SGS and TÜV test reports covering dimensional inspection, hardness, and salt spray resistance. Report numbers and issue dates can be viewed upon request.
In-House Inspection Checklist (Every Batch):
Thread Go/No-Go gauge test
Rockwell/Vickers hardness sampling
Coating thickness measurement
Cross-hatch adhesion test (ISO 2409)
Practical torque assembly test on calibrated stud
Our production base in Ningbo, Zhejiang covers over 10 acres with 100+ trained operators. The facility is equipped with:
12 large cold heading machines
20+ CNC machining centers
Fully automated electroplating and electrophoretic coating lines
2 large stamping presses
We operate under 5S lean management, and all staff undergo mandatory quality and safety training before taking up their posts. Monthly production capacity for M12x1.5 lug nuts exceeds 500,000, ensuring stable supply for both stock and custom orders.
Case 1: Aftermarket Distributor in Southeast Asia (Malaysia)
Product Supplied: M12x1.5 Bulge Acorn Wheel Lug Nut, chrome plated, 19mm hex
Application: Replacement lug nuts for popular passenger car models (Toyota Vios, Honda City) sold through retail workshops
Problem Observed with Previous Supplier: Frequent reports of nut seizure and red rust during rainy season, leading to 8 returns per 100 units sold over 12 months
J&W Auto Parts Solution: Supplied chrome-plated, cold-forged nuts with batch salt spray certification
Results After 12 Months: Zero seizure or rust-related returns on the tested batch. The distributor increased order quantity by 40% in the following year.
We encourage you to contact us for a sample to conduct your own comparative evaluation.
J&W Auto Parts M12x1.5 Bulge Acorn Wheel Lug Nuts are a universal-fit solution for any vehicle that uses M12x1.5 wheel studs and requires conical (60°) bulge seat nuts. Common applications include:
Passenger Cars: Toyota Corolla, Camry; Ford Focus, Mondeo; Chevrolet Cruze, Malibu; Geely Emgrand, Haval H6, and many other sedans/hatchbacks.
Light Commercial Vans & Pickups: Ford Ranger, Toyota Hilux (check seat type), and similar light trucks.
Modified & Aftermarket Wheels: Aftermarket alloy wheels frequently use conical seats and benefit from the bulge’s extra clamping area.
Trailers & RVs: Ideal for single-axle and tandem-axle trailers requiring durable, rust-resistant fasteners.
Always confirm your vehicle’s thread pitch (M12x1.5) and required seat type before ordering. Installation follows OEM torque specifications — no special modifications needed.
1. Verify that your vehicle’s wheel stud is M12x1.5 and the wheel requires conical (60°) bulge seat nuts.
2. Hand-start each nut until the threads engage smoothly; do not force if resistance is felt.
3. Snug all nuts in a star pattern using a standard hex socket.
4. Apply the vehicle manufacturer’s recommended torque (typically 90–120 Nm for M12 fasteners) with a calibrated torque wrench.
5. Re-check torque after the first 50–100 km of driving to compensate for initial seating.
Low MOQ & Flexible Packaging: Starting at 2 boxes for standard items; larger quantities benefit from tiered pricing. Neutral strong cartons or custom-branded boxes available.
Mixed Container Consolidation: Combine M12x1.5 Bulge Acorn Wheel Lug Nuts with our spline lug nuts, wheel spacers, or tools to fill a container and reduce freight.
Custom Development: Send us your sample or drawing, and we can quote custom hex sizes, thread lengths, seat profiles, and colors. Mold development and sampling charges communicated transparently upfront.
Pre-Shipment Transparency: Before balance payment, we send photos of the finished goods and packaging. Shipping documentation, including SGS/TÜV reports, is provided for customs clearance.
A: Our chrome-plated and Dacromet versions have consistently passed 72-hour salt spray tests per QC/T 625-2013 in independent lab evaluations. This indicates strong resistance to red rust under standardized corrosive conditions. However, actual service life depends on environmental factors, maintenance, and physical damage to the coating. We provide SGS/TÜV reports to support our corrosion resistance claims.
A: If your vehicle has M12x1.5 wheel studs and uses 60° conical bulge seat nuts, these should be mechanically compatible. We recommend checking your owner’s manual or consulting our sales team with your car make, model, and year.
A: Yes. We routinely share SGS and TÜV test report copies (with confidential details redacted) during the inquiry process. We also offer evaluation samples so you can verify fit and finish.
A: Yes. We can laser engrave your logo on the nut top and use custom packaging. MOQ for branding depends on order volume; contact us for details.
Your next batch of M12x1.5 Bulge Acorn Wheel Lug Nuts can come with full traceability: cold-forged density, automated thread precision, batch-level salt spray records, and SGS/TÜV certification. Join the distributors and workshops in over 30 countries who rely on J&W Auto Parts fasteners.
Request a Sample, Test Report, or Wholesale Quotation Today Response within 12 hours. We’ll provide pricing, lead time, and the documentation you need to make a confident sourcing decision.
Ningbo Junwei Trading Co., Ltd. — "Reputation First, Quality Assurance"
Address
No.539 Guangyi Road, Guanhaiwei Town, Cixi, Ningbo, Zhejiang, China
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