Exportador de tornillos de cabeza hueca avellanada DIN 7991
XZ Fastener supplies DIN 7991 countersunk socket head screws for export orders where buyers need a flush head, internal hex drive, and stable metric thread quality. These flat head socket screws can be supplied in alloy steel, carbon steel, stainless steel 304, and stainless steel 316, with black oxide, zinc plated, nickel plated, phosphate, Dacromet, Geomet, or passivated finish according to order requirement. For consolidated shipments, buyers can combine countersunk screws with related productos de fijación such as nuts, washers, threaded rods, and hex bolts.
Export support can include packing photos, carton labels, pallet plans, inspection records, and shipment document coordination.
Especificaciones rápidas
Lo que los compradores deben saber antes de adquirir tornillos de cabeza hueca avellanada DIN 7991
Confirm Flush Seating Details
DIN 7991 countersunk socket head screws are used where the fastener head must sit level with the assembly surface. Buyers should confirm countersink angle, head diameter, head height, socket size, thread pitch, and length measurement method before placing an export order.
For OEM equipment and machined parts, a drawing is helpful because countersunk seating depends on both the screw head geometry and the prepared hole in the mating component.
Prepare Export Packing Requirements
Export orders need clear packing rules, not only screw dimensions. Confirm carton weight limit, inner box quantity, bag packing, label language, barcode requirement, pallet size, and shipping mark before quotation.
For distributors and importers, the guide on sourcing fasteners from China for distributors explains practical stock, packaging, and quality points for repeated shipments.
Descripciones de compras comunes
DIN 7991 countersunk socket head screws are often described in different ways across purchasing lists. Clear wording helps avoid incorrect head style, drive type, or length interpretation.
- DIN Tornillos de cabeza hueca avellanada 7991, acabado acero aleado 10.9 o 12.9, óxido negro, métrico rosca gruesa.
- DIN 7991 flat head socket screws, stainless steel 304 or 316, plain or passivated finish, export carton packing.
- Hex socket countersunk head screws, M3 to M16, zinc plated or nickel plated, customer label available upon request.
- DIN 7991 countersunk screws ordered together with DIN 933 full thread hex bolts for machinery assembly kits.
- Grado 8.8 acero al carbono pernos hexagonales, métrico pernos de cabeza hexagonal y avellanado tornillos con hexágono interior para fabricación de equipos.
- Zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts supplied with nuts and washers for consolidated export shipments.
Tabla de especificaciones detalladas
| Artículo de especificación | Opciones disponibles | Notas del comprador de exportación |
|---|---|---|
| Tipo de producto | DIN 7991 tornillos de cabeza hueca avellanada, cabeza plana tornillos con hexágono interior, tornillos avellanados de cabeza hueca hexagonal | Confirm DIN 7991 or ISO 10642 reference if the drawing specifies a particular head profile. |
| Rango de tamaño | Los tamaños comunes incluyen M3, M4, M5, M6, M8, M10, M12, M16; Se pueden discutir otros tamaños. | Envíe diámetro x largo y aclare si el largo se mide desde la parte superior de la cabeza. |
| Hilo | Métrico rosca gruesa; métrico rosca fina disponible bajo pedido | Thread pitch and tolerance should match the tapped hole, nut, or assembly drawing. |
| Cabeza y conducción | Cabeza plana avellanada con casquillo hexagonal interno | Head angle, socket fit, and seating depth should be checked for flush assemblies. |
| Materiales | acero aleado, acero al carbono, acero inoxidable 304, acero inoxidable 316 | Material should be selected according to strength, corrosion exposure, appearance, and cost target. |
| clase de resistencia | 8.8, 10.9, 12.9, A2-70, A4-70, A4-80 | High-strength alloy steel grades should be matched with tightening method and assembly design. |
| Acabado superficial | óxido negro, zincado, zinc amarillo, niquelado, fosfato, Dacromet, Geomet, acero inoxidable liso, pasivación | Coating thickness can affect thread fit and head seating; sample approval can be arranged when required. |
| Embalaje | Cartón a granel, caja pequeña, bolsa de plástico, etiqueta de cliente, etiqueta de código de barras, embalaje de palés | Carton size, gross weight, shipping mark, and pallet loading should be confirmed before production packing. |
| Inspección | Verificación de dimensiones, verificación del calibre de rosca, verificación del tamaño del casquillo, verificación del asiento del cabezal, inspección de superficies, prueba de dureza | El informe de inspección y las fotografías del embalaje se pueden suministrar según los requisitos del pedido. |
| Exportar documentos | Factura comercial, lista de empaque, conocimiento de embarque, certificado de origen cuando sea necesario. | Document requirements should be discussed before shipment arrangement. |
Explicación de materiales y grados
acero aleado DIN 7991 tornillos are commonly requested in grades 10.9 and 12.9 for machinery, tooling, fixtures, molds, and compact assemblies that require stronger clamping performance with a flush head.
Opciones de acero al carbono can be supplied for general industrial applications where cost control and coating protection are important. Buyers should confirm whether black oxide, zinc plating, phosphate, or another finish is required.
acero inoxidable 304 y 316 are selected when corrosion resistance and clean appearance are important. Stainless 316 is preferred for humid, outdoor, marine-related, or chemical environments.
For broader screw selection, the guía industrial para la selección de tornillos can help buyers compare countersunk socket screws with pan head, button head, self-tapping, and machine screw options.
Guía de selección de acabado superficial
óxido negro
Common for alloy steel countersunk socket screws used in indoor machinery, fixtures, molds, and tooling. Oiling may be requested for storage protection.
zincado
Suitable for general export stock where bright appearance and moderate corrosion protection are required.
niquelado
Often selected for appearance-sensitive assemblies or buyer-specific surface requirements.
Fosfato
Se utiliza cuando se requiere una apariencia más oscura, retención de aceite o fricción controlada en ensamblajes mecánicos.
Dacromet y Geomet
Disponible a pedido para necesidades de mayor resistencia a la corrosión, especialmente donde no se prefiere la galvanoplastia tradicional.
Coating Comparison
Buyers can compare finish options in the guía de revestimiento de sujetadores antes de confirmar la especificación final.
Manufactura y Control de Calidad
DIN 7991 countersunk socket head screws are typically produced through wire preparation, cold heading or forming, socket forming, thread rolling, heat treatment when required, surface finishing, sorting, and packing. Countersunk head forming must be controlled because the head angle and head diameter affect flush seating.
La inspección puede incluir el diámetro de la cabeza, la altura de la cabeza, el perfil del avellanado, el tamaño del casquillo, la longitud total, la longitud de la rosca, el paso de la rosca, el ajuste de la rosca, la condición de la superficie y la dureza de las piezas de acero tratadas térmicamente. el guía de métodos de inspección de hilo explains practical thread checks buyers can request before shipment.
For export shipments, XZ Fastener can prepare packing photos, carton labels, inspection records, and shipment document support according to order requirement.
Aplicaciones
Montajes Industriales
- Machine guards, panels, covers, brackets, access plates, and equipment housings.
- Accesorios de automatización, placas de herramientas, componentes de moldes y conjuntos relacionados con CNC.
- Conectores de muebles, herrajes para exhibidores, marcos metálicos y estructuras de superficie al ras.
- Armarios eléctricos, carriles guía, piezas de maquinaria compacta y equipos OEM.
Export Purchasing Programs
- Distributor stock orders with mixed M3 to M16 countersunk socket screw sizes.
- OEM lotes de producción con material, calidad, acabado y formato de empaque controlados.
- Combined container orders with socket screws, machine screws, hex bolts, nuts, and washers.
- Private-label cartons, barcode labels, and palletized export packing available upon request.
Cómo obtener una cotización más rápida
Send diameter, length, thread pitch, material, strength grade, finish, quantity, packaging method, inspection requirements, destination port, and document requirements. If the screw must sit perfectly flush, include the assembly drawing, countersink angle, countersink diameter, and any special head tolerance requirement.
For export orders, packaging and documents are part of the purchasing plan. Buyers can review documentos de envío de sujetadores y el container loading guide before confirming carton weight, pallet dimensions, and shipment marks.
Preguntas frecuentes
Can XZ Fastener supply DIN 7991 countersunk socket head screws for export orders?
Yes. DIN 7991 countersunk socket head screws can be supplied for export orders, distributor stock, OEM projects, and equipment manufacturing. Buyers should provide size, material, grade, finish, quantity, packaging, and inspection requirements.
¿Cuál es la diferencia entre los tornillos DIN 7991 y DIN 912?
DIN 7991 screws have a countersunk flat head designed to sit flush with the surface. DIN 912 screws have a cylindrical socket head. The correct choice depends on head clearance, appearance, seating surface, and assembly design.
¿Qué materiales están disponibles para DIN 7991 avellanado tornillos con hexágono interior?
Los materiales comunes incluyen acero aleado, acero al carbono, acero inoxidable 304 y acero inoxidable 316. Se pueden analizar otros materiales cuando se proporcionen dibujos, muestras y requisitos de aplicación.
Can export cartons include buyer labels and barcodes?
Sí. Se pueden organizar cajas de cartón a granel, cajas pequeñas, bolsas de plástico, etiquetas de comprador, etiquetas de códigos de barras, marcas de envío y etiquetas de palés según los requisitos del pedido. El contenido de la etiqueta debe confirmarse antes del embalaje.
¿Qué acabados se pueden suministrar para los tornillos avellanados DIN 7991?
Las opciones de acabado pueden incluir óxido negro, zincado, zinc amarillo, niquelado, fosfato, Dacromet, Geomet, acero inoxidable simple y acero inoxidable pasivado. El acabado adecuado depende del material, el entorno de aplicación, la apariencia y el ajuste de la rosca.
What documents are usually needed for export shipments?
Common export documents may include commercial invoice, packing list, bill of lading, and certificate of origin when required. Inspection reports and packing photos can also be supplied according to order requirement.
Send Your DIN 7991 Countersunk Socket Screw Export Inquiry
Send your size list, finish, quantity, packaging method, carton or pallet requirement, inspection requirements, destination port, and shipment document needs. XZ Fastener can review DIN 7991 countersunk socket head screws and related fasteners for export quotation.
Contacto XZ Fastener
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