What are the standard salt spray test requirements for exterior bolts?

For standard exterior applications, you should specify a minimum of 48 to 96 hours in a neutral salt spray test. For coastal or marine environments, specify 316 stainless steel or specialized PVD coatings capable of withstanding 200 hours or more without red rust.

Can I mix finishes to meet the factory's MOQ?

Generally, no. Because electroplating and powder coating are batch processes, factories usually require the Minimum Order Quantity to be met per finish and per size (e.g., 1,000 pieces in Matte Black, 1,000 pieces in Satin Nickel).

How do I prevent the bolt mechanism from becoming stiff over time?

Specify the use of high-grade, temperature-resistant factory lubricants during assembly, and ensure the machining tolerances between the bolt and the housing are strictly controlled (typically within 0.2mm).

Is it cheaper to buy die-cast zinc or stamped stainless steel?

Die-cast zinc is generally cheaper for complex shapes and bulk production, but it lacks the tensile strength and natural corrosion resistance of stamped stainless steel. Zinc is best suited for interior applications, while stainless is mandatory for high-security or exterior use.

Door & Window Bolts

Source high-quality door and window bolts from vetted suppliers and manufacturers across Asia. Designed for importers, wholesalers, distributors, and hardware brands requiring OEM/private-label production, this catalog offers direct access to bulk manufacturing for robust, reliable security hardware at competitive wholesale pricing.

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Zinc-Plated Steel Door Latch with Keyhole

This heavy-duty door latch mechanism is constructed from zinc-plated steel, featuring a robust sliding bolt design for secure locking. The assembly includes three countersunk screws for flush mounting, ensuring a clean and professional installation.

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Black Steel Tower Bolt

This heavy-duty steel tower bolt is finished in black. It is designed for secure fastening and is available in multiple sizes.

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Sliding Tower Bolt with Pin Lock

This tower bolt is designed for secure fastening on doors and gates. Constructed from durable metal, it features a sliding bolt mechanism with a pin lock for enhanced security.

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Heavy Duty Metal Barrel Bolt

This barrel bolt is designed for secure fastening of doors, gates, and cabinets. Constructed from durable metal, it features a sliding bolt mechanism and multiple mounting holes for easy installation.

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Stainless Steel Door Flush Bolt

This stainless steel flush bolt is designed for secure door and gate fastening. It is available in multiple sizes ranging from 6 to 18 inches and features a sleek, rectangular design with countersunk mounting holes for a flush installation.

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Sliding Door Bolt Latch

This sliding door bolt latch is designed for secure fastening of doors and gates. It features a sliding bar that engages with a strike plate, providing a dependable locking solution.

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Sliding Drawer Lock

This sliding lock is designed for drawers and sliding doors. It features a metal bar with a toothed edge and a cylindrical locking mechanism.

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Mortise Lock Body with Rectangular Bolt

This mortise lock body features a rectangular bolt, latch and keyhole. Constructed with a metal faceplate and a grey body, it is suitable for interior doors requiring a standard locking mechanism.

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Sourcing door and window bolts at scale requires strict attention to material integrity, machining tolerances, and surface finishing. A bolt that fails a salt spray test, corrodes prematurely, or binds in its keeper damages your brand's reputation instantly. Securing reliable production means looking past superficial polish to verify the underlying metallurgy and the manufacturer's internal quality management systems.

Material Specifications and Fabrication Methods

The core cost driver and performance indicator for any architectural bolt is the base material. Manufacturers typically utilize extrusion, stamping, or die-casting depending on the alloy and the required structural integrity of the final product.

Material	Fabrication Method	Corrosion Resistance	Typical Application
Stainless Steel (304/316)	Stamping / Machining	Excellent	Exterior, Marine, Heavy Duty
Solid Brass	Extrusion / Forging	High	Premium Architectural, Decorative
Zinc Alloy	Die-Casting	Moderate	Interior, Cost-Sensitive Projects
Aluminum	Extrusion	Good	Lightweight Window Applications

When dealing with overseas suppliers, material substitution is a common risk. A factory might quote for 304 stainless steel but substitute 201 stainless to improve their margins, leading to rapid rusting in exterior applications. Verifying a factory's raw material sourcing is critical; conducting thorough factory audits ensures the manufacturer has the testing equipment (like spectrometers) to verify incoming raw materials before production begins.

Struggling with inconsistent hardware finishes or material substitution? Let our sourcing experts evaluate your supply chain and identify capable, verified manufacturing partners.

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Critical Quality Control Checkpoints

Even with the correct base material, poor machining or substandard electroplating will ruin a batch of hardware. Quality control must be implemented at multiple stages of production, not just when the goods are packed.

Essential Inspection Points for Bolts

Dimensional Tolerance: Ensure the bolt throw aligns perfectly with the strike plate or keeper without binding.
Plating Thickness: Verify electroplating or PVD coating thickness to ensure it meets salt spray test requirements (typically 48 to 96 hours).
Spring Tension: For spring-loaded bolts, test the fatigue life and tension consistency across the batch.
Finish Consistency: Check for blistering, pitting, or uneven color matching, especially on antique brass or matte black finishes.
Assembly Integrity: Ensure rivets, screws, and internal mechanisms are securely fastened and lubricated.

Implementing rigorous quality control and inspection protocols at the factory level—such as inline inspections during the plating process and pre-shipment randomized sampling—catches these defects before the container is sealed.

Production Realities: MOQ, Tooling, and Pricing

Understanding the economic realities of hardware manufacturing helps you negotiate better terms and plan your inventory cycles accurately.

1,000 - 3,000

Typical MOQ (Pieces)

Per finish and per size for standard models.

30 - 45 Days

Standard Lead Time

Production time after sample approval and deposit.

$500 - $2,500

Tooling Costs

For custom molds or stamping dies.

Pricing is highly sensitive to copper and zinc commodity markets, as well as the complexity of the finish. PVD (Physical Vapor Deposition) coatings, while offering superior scratch resistance, will significantly increase the unit cost and often require higher MOQs compared to standard powder coating or basic electroplating.

If your brand requires proprietary locking mechanisms or unique architectural designs, utilizing specialized OEM/ODM services allows you to develop custom tooling. Owning your molds prevents the factory from selling your designs to competitors and ensures strict adherence to your technical drawings.

Need to develop custom bolt tooling or consolidate your hardware purchasing? We can manage the entire process from prototyping to final delivery.

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Buyer FAQ

Successfully importing door and window bolts requires balancing material costs with stringent quality oversight. By defining precise technical specifications and maintaining a presence on the factory floor, you can secure reliable hardware that meets your market's demands. When you are ready to streamline your procurement and eliminate quality fade, professional sourcing support ensures your production runs exactly as engineered.

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