A4-70 acero inoxidable pernos hexagonales fábrica
XZ Fastener supplies A4-70 stainless steel hex bolts for industrial buyers who need dependable corrosion resistance, clear specifications, and export-ready packing. These external hex fasteners are commonly ordered as DIN 933 full thread hex bolts, ISO 4017 metric hex head bolts, DIN 931 partial thread bolts, or drawing-based parts according to project requirements. A4-70 is suitable for many marine, outdoor, chemical equipment, and machinery assemblies where 316-family stainless steel is preferred over carbon steel. Buyers can source acero inoxidable pernos hexagonales with size lists, material documents, matching nuts and washers, and inspection details confirmed before production.
Estándar
DIN 933 / ISO 4017 rosca completa; DIN 931 / ISO 4014 opcional
fuerza
A4-70, with A4-80 available upon request
Materiales
A4/316 - Familia austenítica acero inoxidable
terminar
Simple, pasivado, decapado y pasivado, lubricado
Solicitud
Marine fittings, outdoor structures, equipment, chemical plants
Lo que los compradores deben saber antes de adquirir A4-70 acero inoxidable pernos hexagonales
A4-70 hex bolts are often selected for corrosion resistance first and strength second. If the joint is highly loaded, exposed to vibration, or controlled by a structural standard, the bolt grade, nut grade, washer hardness, tightening method, and service environment should be checked together before purchase.
Confirm the standard first
DIN 933 and ISO 4017 indicate full thread hex bolts, while DIN 931 and ISO 4014 indicate partial thread hex bolts. XZ Fastener also supplies A2 y A4 pernos de cabeza hexagonal for projects that require mixed full thread and partial thread lists.
Separate material from strength
A4 describes the stainless steel group, while 70 describes the property class. A4-70 is different from Grade 8.8 carbon steel hex bolts; the correct choice depends on corrosion exposure, joint load, and the mating material.
Check thread fit and galling risk
Stainless steel threads can gall under high assembly speed or dry tightening. For repeated assembly, buyers may request lubrication, anti-seize guidance, or a matching nut and washer set.
Descripciones de compras comunes
Clear purchasing descriptions reduce confirmation time and help avoid mixed standards in the same order. Typical buyer wording includes:
- A4-70 stainless steel hex bolts DIN 933 full thread, M8 x 30, plain finish.
- 316 stainless steel metric hex head bolts ISO 4017, A4-70, passivated.
- DIN 931 partial thread A4-70 hex bolts with matching stainless nuts and flat washers.
- Stainless steel hex cap screws M6-M24, A4-70, for marine equipment assembly.
- DIN 933 rosca completa pernos hexagonales in carbon steel when the buyer specifies zinc plated DIN 933 bolts, black oxide DIN 933 bolts, hot dip galvanized DIN 933 bolts, or Grade 8.8 carbon steel hex bolts instead of stainless steel.
If the order combines stainless and carbon steel items, mark each line clearly with material, grade, finish, and inspection requirement.
Tabla de especificaciones detalladas
| Artículo | Especificación | Notas del comprador |
|---|---|---|
| Nombre del producto | A4-70 acero inoxidable pernos hexagonales | Can be supplied as bolts only or with matching nuts and washers. |
| Estándares | DIN 933, ISO 4017, DIN 931, ISO 4014, piezas basadas en dibujos | Confirm full thread or partial thread before quotation. |
| Rango de diámetro | Common metric sizes such as M3-M36; larger sizes by order requirement | Actual range depends on standard, length, and production method. |
| Longitud | Longitudes estándar o longitudes personalizadas según planos. | For thread details, see this guía de longitud de rosca de perno. |
| Hilo | Métrico rosca gruesa; paso fino disponible bajo petición | Provide pitch if the order is not standard coarse thread. |
| Materiales | A4/316 - Familia austenítica acero inoxidable | La composición química final sigue el estándar seleccionado y el orden de compra. |
| Clase de propiedad | A4-70 bajo referencia ISO 3506 | A4-80 can be discussed when higher stainless strength is needed. |
| Acabado superficial | Liso, pasivado, decapado y pasivado, pulido, lubricado | El acabado debe coincidir con la exposición a la corrosión y el método de montaje. |
| Inspección | Dimensions, thread gauges, visual appearance, material documents, mechanical test reports upon request | Documentos de inspección estatal antes del inicio de la producción. |
| Embalaje | Bulk cartons, small boxes, pallet packing, labels, barcodes, private packing | Packaging can be arranged according to order requirement. |
Explicación de materiales y grados
A4 stainless steel is a molybdenum-bearing austenitic stainless group widely used where chloride exposure, outdoor moisture, or chemical environments may attack ordinary carbon steel or lower stainless grades. A4-70 indicates a stainless property class commonly associated with a minimum tensile strength level of 700 MPa under ISO 3506 reference conditions.
For many buyers, the most important comparison is A2 versus A4. A2 is suitable for general indoor and mild outdoor applications, while A4 is typically preferred for marine air, chemical equipment, wastewater facilities, and coastal structures. For more material selection background, review XZ Fastener’s guide to Sujetadores A2 frente a A4 acero inoxidable.
A4-70 should not be treated as a direct substitute for Grade 8.8 carbon steel hex bolts without checking load requirements. Grade 8.8 carbon steel has higher strength, while A4-70 offers better corrosion resistance in many environments.
Inspection requirements can be confirmed before production, including dimensions, thread fit, surface condition, and documents.
Guía de selección de acabado superficial
Most A4-70 stainless steel hex bolts are ordered in plain stainless or passivated finish. Passivation helps remove free iron from the surface and supports the natural stainless protective layer. Pickling and passivation may be requested when welding scale, heavy oxide, or stronger surface cleaning is required.
| terminar | When to Use | Important Note |
|---|---|---|
| inoxidable liso | General machinery, indoor assemblies, clean stainless appearance | Economical and widely used for standard stainless fasteners. |
| Pasivado | Outdoor, marine air, chemical equipment, food-related support frames | Common choice when corrosion resistance and clean surface are both important. |
| Decapado y pasivado | Requisitos de limpieza de superficies más exigentes | Confirm appearance expectations and inspection method in advance. |
| Lubricated or anti-seize prepared | Conjuntos con problemas repetidos de apriete o irritación | Los valores de torque pueden cambiar cuando se usa lubricación. |
| Recubrimientos acero al carbono | zincado DIN 933 pernos, óxido negro DIN 933 pernos, galvanizado en caliente DIN 933 pernos | These are generally carbon steel alternatives, not standard A4 stainless finishes. |
For coating comparisons on carbon steel and other fasteners, see this guía de acabado de sujetadores.
Manufactura y Control de Calidad
Production planning starts from the confirmed standard, size list, material grade, thread type, finish, packaging, and document requirements. Depending on diameter and length, A4-70 stainless steel hex bolts can be produced by cold heading, hot forging, machining, thread rolling, or thread cutting. The selected process depends on size, quantity, tolerance, and lead time.
Antes de la producción
XZ Fastener checks the purchase description, drawing, material requirement, thread pitch, finish, packing method, and inspection documents. For non-standard items, sujetadores personalizados can be reviewed from drawings or samples.
Durante la producción
Common control points include head dimensions, across-flat size, thread length, thread gauge fit, surface appearance, burr control, and mixing prevention between stainless grades.
Before shipment
Carton labels, pallet marks, quantity, finish, and inspection documents are checked according to order requirement. Material test certificates and third-party inspection can be discussed before order confirmation.
Aplicaciones
A4-70 stainless steel hex bolts are selected when buyers need a balance of corrosion resistance, standard metric dimensions, and practical assembly with wrenches or sockets. They are widely used in:
- Equipos marinos e instalaciones costeras.
- Equipos de procesamiento químico
- Conjuntos exteriores de acero y aluminio.
- Sistemas de tratamiento de aguas residuales.
- Hardware de soporte de bombas, válvulas y tuberías
- Estructuras de soporte de alimentos y bebidas.
- Montaje solar y marcos de equipos expuestos.
- Mantenimiento de maquinaria y repuestos.
For submerged seawater, strong chloride chemicals, or critical load-bearing joints, confirm the engineering requirement before selecting A4-70.
Cómo obtener una cotización más rápida
A clear inquiry helps XZ Fastener quote the correct A4-70 stainless steel hex bolts without repeated clarification. Please provide:
- Size list, such as M8 x 30, M10 x 50, M12 x 80.
- Estándar, como DIN 933, ISO 4017, DIN 931, ISO 4014 o número de dibujo.
- Material y calidad, como A4-70, A4-80, A2-70 o 316 acero inoxidable.
- Requisito de acabado, como liso, pasivado, decapado y pasivado o lubricado.
- Quantity for each size and whether partial shipment is acceptable.
- Packaging requirement, including bulk carton, small box, pallet, label, barcode, or private brand packing.
- Inspection requirements, such as MTC, dimensional report, salt spray reference, or third-party inspection.
- Destination port or delivery term if freight support is needed.
Para una consulta estructurada, utilice el solicitar una cotización page and attach drawings or a spreadsheet if available.
Preguntas frecuentes
Is A4-70 the same as 316 stainless steel?
A4 is commonly associated with the 316-family stainless steel group, while A4-70 also defines a mechanical property class. The final chemical composition and mechanical values should follow the selected standard and purchase order.
What is the difference between DIN 933 and DIN 931 hex bolts?
DIN 933 usually refers to full thread hex bolts, while DIN 931 usually refers to partial thread hex bolts. Buyers should confirm thread length because it affects assembly, shear area, and stock availability.
¿Puede A4-70 acero inoxidable pernos hexagonales reemplazar el grado 8.8 acero al carbono pernos hexagonales?
Not automatically. A4-70 is chosen for corrosion resistance, while Grade 8.8 carbon steel hex bolts are chosen for higher strength. The joint load, environment, and engineering requirement should be checked before substitution.
Which finish is recommended for A4-70 stainless bolts?
Plain stainless and passivated finishes are common. Passivation is often requested for outdoor, marine air, chemical equipment, and clean stainless assemblies. Lubrication may be useful when galling risk is a concern.
¿Puede XZ Fastener suministrar tuercas y arandelas compatibles?
Yes. Matching stainless hex nuts, flat washers, spring washers, and packing sets can be supplied according to the bolt material, thread, standard, and project requirement.
¿Qué documentos se pueden solicitar con el envío?
Buyers may request material test certificates, dimensional inspection reports, visual inspection records, packing lists, and other documents according to order requirement. Document needs should be stated before production.
Can custom sizes or non-standard hex bolts be produced?
Custom lengths, special thread pitch, drawing-based head dimensions, markings, and packaging can be discussed. Send drawings, samples, photos, quantity, and application details for review.
Envíe su consulta sobre A4-70 Inoxidable perno hexagonal
To receive a practical quotation, send your size list, finish, quantity, packaging method, and inspection requirements. Include the standard or drawing number, destination, and whether matching nuts and washers are needed. XZ Fastener will review the details and help confirm a supply plan according to your order requirement.
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