Tornillos SEMS de Latón
Tornillos SEMS de Latón
Tornillos SEMS de Latón and Silicon Bronze SEMS screws for the fastening industry.
We are one of the leading fabricantes y exportadores of Tornillos SEMS de Latón and Silicon bronze SEMS screws and allied fasteners de India. SEMS screws are an acronym of-‘Screw with Engineered Mechanical Safety’. We have been supplying these specialized fasteners and Brass Machine Screws , Bronze Machine Screws to the world market for many decades. Our state-of-the-art manufacturing facility located in the industrial hub of Gujarat, India, is equipped with cutting-edge machinery and staffed by skilled technicians with extensive experience in precision engineering. Our commitment to quality, customization capabilities, and adherence to international norma/estándars has established us as a trusted name in the fastener industry globally. With a focus on customer satisfaction and product excellence, we continue to expand our reach to diverse industries across continents while maintaining the highest norma/estándars of manufacturing and delivery.
Product Overview
Tornillos SEMS de Latón are specialized fasteners featuring pre-assembled washers permanently attached to the screw. These innovative fasteners combine a screw and washer into a single unit, eliminating the need for separate installation of washers and significantly improving assembly efficiency. The term «SEMS» stands for «Screw with Engineered Mechanical Safety,» highlighting their enhanced stability and load distribution capabilities.
Our Tornillos SEMS de Latón are manufactured through a sophisticated process that involves first attaching a washer to the screw blank, followed by precision thread rolling. This unique manufacturing sequence ensures the washer remains securely in place during installation and throughout the fastener’s service life. Disponible en multiple thread norma/estándars including Metric, UNC (Unified National Coarse), and UNF (Unified National Fine), our SEMS screws are crafted from premium Brass and Silicon Bronze materials to provide exceptional resistencia a la corrosión and conductividad eléctrica.
Material Especificaciones
| Material | Composition | Properties | Aplicaciones |
|---|---|---|---|
| Brass | Copper (63-68%), Zinc (32-37%) | Excellent resistencia a la corrosión, good conductividad eléctrica, low magnetic permeability | Electrical applications, marine environments, decorative hardware |
| Silicon Bronze | Copper (96-98%), Silicon (1.5-3.5%), Manganese (0.1-1.5%) | Superior resistencia a la corrosión in marine environments, high tensile resistencia, excellent fatigue resistance | Marine hardware, outdoor applications, historic restoration |
Material Calidad/Grados Available:
- Brass: C26000 (Cartridge Brass), C27000 (Yellow Brass), C22000 (Commercial Bronze), C23000 (Red Brass)
- Silicon Bronze: C65500, C65100
International Norma/Estándars Compliance:
- ASTM B36/B36M (Brass Plate, Sheet, Strip, and Rolled Bar)
- ASTM B134/B134M (Brass Wire)
- ASTM B98/B98M (Silicon Bronze Rod, Bar, and Shapes)
- ASTM F738M (Metric Especificaciones for Stainless Steel Fasteners)
- DIN 7985 (Cross Recessed Pan Head Screws)
- IS 1367 (Technical Supply Conditions for Threaded Fasteners)
- JIS B1111 (Cross Recessed Pan Head Machine Screws)
Material Properties
| Property | Brass C26000 | Silicon Bronze C65500 |
|---|---|---|
| Tensile Resistencia | 330-430 MPa | 480-620 MPa |
| Yield Resistencia | 150-300 MPa | 380-520 MPa |
| Elongation | 25-55% | 18-30% |
| Dureza (Brinell) | 70-130 HB | 100-180 HB |
| Density | 8.53 g/cm³ | 8.8 g/cm³ |
| Electrical Conductividad | 28% IACS | 7% IACS |
| Thermal Conductividad | 120 W/m·K | 50 W/m·K |
| Corrosion Resistance | Excellent | Superior |
Manufacturing Process
Our Tornillos SEMS de Latón undergo a sophisticated multi-stage manufacturing process:
- Material Selection and Testing: Raw material is inspected and tested for composición química and propiedades mecánicas.
- Blank Formation: Wire or rod stock is cut to precise longituds and undergo initial forming.
- Head Formation: The screw head is formed through cold forging using Cartridge Brass (C26000) or Yellow Brass (C27000), which offer excellent formability without the brittleness associated with leaded brasses.
- Washer Assembly: Precision-manufactured washers are placed onto the screw blank before threading.
- Thread Rolling: Rather than cutting threads (which would remove material and weaken the fastener), we employ thread rolling technology that compresses and forms the threads, resulting in stronger fasteners with superior fatigue resistance.
- Heat Treatment: Screws undergo controlled heating and cooling processes to achieve optimal propiedades mecánicas.
- Acabado Superficialing: Depending on customer requirements, screws may receive polishing, plating, or other surface treatments.
- Quality Control: Each batch undergoes rigorous inspection and testing for dimensional accuracy, material properties, and rendimiento characteristics.
Manufacturing Equipment
Our state-of-the-art facility utilizes advanced machinery to ensure precision and consistency:
- Multi-Station Cold Headers: Capable of producing up to 300 parts per minute with minimal variation
- High Speed Thread Rolling Machines: Japanese technology providing superior thread quality and consistency
- Works Formers: Advanced forming technology for complex head designs
- Progressive Headers: Italian precision equipment for multi-stage forming operations
- Coordinate Measuring Machines (CMM): For high-precision dimensional inspection
Dimensional Especificaciones
Metric Thread SEMS Screws
| Size | Thread Pitch | Head Diámetro (mm) | Washer Diámetro (mm) | Head Altura (mm) | Norma/Estándar Longituds (mm) |
|---|---|---|---|---|---|
| M3 | 0.5 | 5.6 | 7.0 | 2.1 | 6, 8, 10, 12, 16, 20 |
| M4 | 0.7 | 7.0 | 9.0 | 2.6 | 8, 10, 12, 16, 20, 25 |
| M5 | 0.8 | 8.5 | 10.0 | 3.1 | 10, 12, 16, 20, 25, 30 |
| M6 | 1.0 | 10.0 | 12.0 | 3.6 | 12, 16, 20, 25, 30, 40 |
| M8 | 1.25 | 13.0 | 16.0 | 4.6 | 16, 20, 25, 30, 40, 50 |
| M10 | 1.5 | 16.0 | 20.0 | 5.6 | 20, 25, 30, 40, 50, 60 |
| M12 | 1.75 | 18.0 | 24.0 | 6.6 | 25, 30, 40, 50, 60, 75 |
Imperial Thread SEMS Screws (UNC/UNF)
| Size | Thread TPI | Head Diámetro (in) | Washer Diámetro (in) | Head Altura (in) | Norma/Estándar Longituds (in) |
|---|---|---|---|---|---|
| #4 | 40 UNC/48 UNF | 0.225 | 0.281 | 0.083 | 1/4, 3/8, 1/2, 5/8, 3/4 |
| #6 | 32 UNC/40 UNF | 0.270 | 0.344 | 0.097 | 1/4, 3/8, 1/2, 5/8, 3/4, 1 |
| #8 | 32 UNC/36 UNF | 0.322 | 0.400 | 0.112 | 3/8, 1/2, 5/8, 3/4, 1, 1-1/4 |
| #10 | 24 UNC/32 UNF | 0.375 | 0.438 | 0.127 | 3/8, 1/2, 5/8, 3/4, 1, 1-1/4 |
| 1/4″ | 20 UNC/28 UNF | 0.438 | 0.500 | 0.144 | 1/2, 5/8, 3/4, 1, 1-1/4, 1-1/2 |
| 5/16″ | 18 UNC/24 UNF | 0.547 | 0.625 | 0.178 | 5/8, 3/4, 1, 1-1/4, 1-1/2, 1-3/4 |
| 3/8″ | 16 UNC/24 UNF | 0.625 | 0.750 | 0.212 | 3/4, 1, 1-1/4, 1-1/2, 1-3/4, 2 |
Tolerance Norma/Estándars
Our manufacturing process adheres to strict tolerance specifications:
| Dimension | Tolerance Range |
|---|---|
| Thread Major Diámetro | ±0.05mm (Metric), ±0.002″ (Imperial) |
| Thread Pitch Diámetro | ±0.03mm (Metric), ±0.001″ (Imperial) |
| Head Diámetro | ±0.10mm (Metric), ±0.004″ (Imperial) |
| Head Altura | ±0.08mm (Metric), ±0.003″ (Imperial) |
| Washer Diámetro | ±0.15mm (Metric), ±0.006″ (Imperial) |
| Overall Longitud | ±0.20mm for longituds up to 20mm, ±0.5mm for longer (Metric) |
| ±0.008″ for longituds up to 1″, ±0.015″ for longer (Imperial) |
Rendimiento Metrics
| Rendimiento Criteria | Brass SEMS | Silicon Bronze SEMS |
|---|---|---|
| Torque Resistencia | 70-80% of steel equivalents | 85-90% of steel equivalents |
| Pull-Out Resistencia | Medium | High |
| Vibration Resistance | Excellent (due to washer) | Excellent (due to washer) |
| Corrosion Resistance (Salt Spray Test) | 500+ hours | 1000+ hours |
| Temperature Rating | -40°C to 200°C | -50°C to 260°C |
| Electrical Conductividad | Excellent | Good |
| Magnetic Properties | Non-magnetic | Non-magnetic |
| Galling Resistance | Excellent | Superior |
| Service Life in Marine Environment | 15-20 years | 25-30 years |
Industries Served
Our Brass and Silicon Bronze SEMS Screws are utilized across diverse industries:
- Marine and Shipbuilding: Corrosion-resistant fasteners for deck equipment, interior fittings, and electrical components
- Electrical Engineering: Terminal connections, aparamenta, and control panel assembly
- Automotriz: Electrical systems, decorative trim, and specialized applications requiring conductividad
- Aerospace: Non-magnetic fasteners for sensitive equipment and electrical systems
- Architectural Hardware: Decorative and functional hardware for doors, windows, and fixtures
- Musical Instruments: Tuning mechanisms, bridges, and structural components
- Medical Equipment: Non-magnetic components for MRI-compatible equipment
- Telecomunicaciones: Grounding systems and RF equipment assembly
- Historical Restoration: Period-appropriate fasteners for heritage structures and artifacts
- Plumbing and Valve Manufacturing: Corrosion-resistant threaded components for water systems
Our Competitive Advantages
Manufacturing Excellence
- Advanced Machinery: Our investment in cutting-edge equipment ensures precision and consistency
- Skilled Workforce: Our technicians have an average of 15+ years of experience in fastener manufacturing
- Rigorous Quality Control: 100% inspection protocols with advanced testing equipment
- Flexibility in Production: Capacity to handle both high-volume orders and specialized custom requirements
Customer-Focused Approach
- Customization Capabilities: Special head styles, thread configurations, and dimensiones available upon request
- Flexible Production Schedule: Ability to prioritize urgent orders without compromising quality
- Technical Support: Our engineering team provides consultation on fastener selection and application
- Sample Development: Rapid prototyping and sample production for new designs
- Competitive Pricing: Direct manufacturing model eliminates intermediaries, reducing costs
Logistics and Service
- Global Shipping Expertise: Established relationships with freight forwarders ensuring reliable delivery worldwide
- Flexible Minimum Order Quantities: Accommodating both large volume and smaller specialized orders
- Comprehensive Documentation: Detailed material certifications, testing reports, and compliance documentation
- Customized Packaging: Private labeling, specialized protective packaging, and kit assembly options
- Digital Communication: Real-time order tracking and progress updates
Packaging and Shipping
Our Tornillos SEMS de Latón are packaged with care to ensure they arrive in perfect condition:
- Norma/Estándar Packaging: Heat-sealed polybags within corrugated cartons
- Premium Options: Anti-corrosion VCI paper wrapping, vacuum-sealed packages, or custom plastic containers
- Bulk Packaging: 25kg maximum per carton for easy handling
- Custom Labeling: Company logo, part numbers, and specifications printed on packaging as required
- Shipping Documentation: Comprehensive commercial documentation including packing lists, material certifications, and test reports
- Export Preparation: All shipments comply with international shipping regulations and customs requirements
- Shipping Methods: Sea freight (norma/estándar delivery), air freight (expedited delivery), and courier services (samples and urgent orders)
Turnaround Time
- Norma/Estándar Production: 4-6 weeks from order confirmation
- Expedited Service: 2-3 weeks (subject to 15% expedite fee)
- Sample Development: 1-2 weeks for custom designs
- Stock Items: Select tamaños available for immediate shipment
Frequently Asked Questions
Q: What makes Tornillos SEMS de Latón different from norma/estándar screws?
A: SEMS Screws feature a pre-assembled washer that is permanently attached to the screw before the threads are formed. This design eliminates the need for separate washers during assembly, saving installation time and ensuring the washer cannot be lost or omitted.
Q: Why choose Brass or Silicon Bronze over Stainless Steel fasteners?
A: Brass and Silicon Bronze offer superior conductividad eléctrica, excellent resistencia a la corrosión (particularly in marine environments), non-magnetic properties, and decorative appearance. They also provide excellent resistance to galling and seizing in threaded applications.
Q: Which Brass alloys are utilizado en your SEMS screws manufacturing?
A: We primarily use C26000 (Cartridge Brass) and C27000 (Yellow Brass) for cold forging operations as they offer excellent formability and good propiedades mecánicas without the brittleness or environmental concerns associated with leaded brasses. For specialized applications, we also use C22000 (Commercial Bronze) and C23000 (Red Brass).
Q: Are your Tornillos SEMS de Latón adecuado para marine environments?
A: Yes, both our Brass and Silicon Bronze SEMS Screws provide excellent resistencia a la corrosión in marine environments. Silicon Bronze offers superior rendimiento in harsh saltwater conditions and is preferred for exterior aplicaciones marinas, while Brass is often used for interior marine components.
Q: Can you produce custom thread specifications beyond norma/estándar offerings?
A: Yes, we can manufacture custom thread configurations including specialized thread pitches, left-hand threads, and modified thread profiles for specific applications. Our engineering team can work with you to develop fasteners that meet your exact requirements.
Q: What is the minimum order quantity (MOQ) for Tornillos SEMS de Latón?
A: Our norma/estándar MOQ is 5,000 pieces for catalog items. For custom specifications, the MOQ is typically 10,000 pieces, though we can accommodate smaller orders with adjusted pricing.
Q: Do you provide material certifications and quality documentation?
A: Yes, proporcionamos comprehensive documentation including material test reports (MTRs), dimensional inspection reports, and compliance certificates. Additional testing documentation está disponible upon request.
Q: How do Silicon Bronze SEMS Screws compare to Brass in resistencia a la corrosión?
A: Silicon Bronze offers superior resistencia a la corrosión, particularly in saltwater environments, making it ideal for exterior aplicaciones marinas. Brass proporciona excelente resistencia a la corrosión for most applications but may develop surface patina over time in harsh conditions.
Q: Can your Tornillos SEMS de Latón be utilizado en electrical applications?
A: Yes, Tornillos SEMS de Latón are excellent for electrical applications due to their high conductividad. The pre-assembled washer provides increased surface contact area, enhancing electrical continuity between components.
Q: What finishing options están disponibles for Tornillos SEMS de Latón?
A: Our Tornillos SEMS de Latón están disponibles with natural finish, polished finish, lacquer coating (to prevent tarnishing), or various plating options including nickel, chrome, or tin. Silicon Bronze screws are typically supplied with natural or polished finish.
Q: How do thread-rolled screws differ from thread-cut screws?
A: Thread rolling forms threads by compressing the material, resulting in stronger threads with unbroken grain flow and work-hardened surfaces. This provides superior fatigue resistance and tensile resistencia compared to thread-cutting, which removes material and interrupts grain structure.
Q: Are your Brass alloys compliant with environmental regulations?
A: Yes, we use lead-free Brass alloys (C26000, C27000) that comply with RoHS, REACH, and other international environmental regulations, making them adecuado para applications where lead content is restricted.
Customer Testimonial
M. Anderson, Procurement Manager, USA
«We’ve been sourcing Brass and Silicon Bronze SEMS Screws from this supplier for over five years now for our high-end marine hardware. The quality and consistency have been exceptional, and their technical support team has been invaluable in helping us specify the right fasteners for challenging applications.»
Glossary of Technical Terms
SEMS (Screw with Engineered Mechanical Safety): A fastener design featuring a pre-assembled washer permanently attached to the screw.
Thread Rolling: A cold-forming process that creates threads by compressing material rather than cutting it, resulting in stronger threads with superior fatigue resistance.
UNC (Unified National Coarse): A norma/estándar thread series featuring coarser thread pitch, providing easier assembly and greater resistencia in soft materials.
UNF (Unified National Fine): A norma/estándar thread series featuring finer thread pitch, providing greater tensile resistencia and better resistance to vibration loosening.
Cartridge Brass (C26000): A copper-zinc alloy containing approximately 70% copper and 30% zinc, offering excellent formability for cold working operations like heading and thread rolling.
Yellow Brass (C27000): A copper-zinc alloy containing approximately 65% copper and 35% zinc, with good resistencia and moderate formability.
Commercial Bronze (C22000): Despite its name, this is actually a brass alloy containing around 90% copper and 10% zinc, offering good resistencia a la corrosión and formability.
Red Brass (C23000): A copper-zinc alloy containing approximately 85% copper and 15% zinc, offering excellent resistencia a la corrosión and moderate resistencia.
Silicon Bronze: A copper alloy containing silicon (typically 1.5-3.5%) and small amounts of other elements, offering superior resistencia a la corrosión and resistencia.
Cold Heading: A manufacturing process where metal is formed at room temperature by applying pressure through dies to create the screw head.
Thread Pitch: The distance between adjacent threads, measured in millimeters for metric threads or expressed as threads per inch (TPI) for imperial threads.
Galling: A form of wear caused by adhesion between sliding surfaces, often resulting in seized threads.
Work Hardening: The resistenciaening of metal by plastic deformation, occurring during the thread rolling process.
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