A4-70 不锈钢六角螺栓出口商
XZ Fastener exports A4-70 stainless steel hex bolts for distributors, project contractors, equipment builders, and maintenance buyers who need corrosion-resistant metric hex head bolts with clear order control. These bolts can be supplied as DIN 933 full thread hex bolts, ISO 4017 bolts, DIN 931 partial thread bolts, or drawing-based stainless fasteners according to order requirement. A4-70 is often selected for coastal, outdoor, marine, chemical, and machinery applications where 316-family stainless steel is preferred. Buyers can source 不锈钢六角螺栓 with packing, labeling, inspection, and export document requirements confirmed before shipment.
标准型
DIN 933 / ISO 4017 全螺纹； DIN 931 / ISO 4014 可选
实力
A4-70; A4-80 可根据要求提供
材质
A4 / 316-系列奥氏体不锈钢
完成
普通、钝化、酸洗钝化、润滑
应用
Marine fittings, outdoor structures, machinery, chemical equipment
买家在采购 A4-70 不锈钢六角螺栓之前应了解什么
A4-70 stainless hex bolts are not simply “silver bolts.” They should be specified by standard, diameter, length, thread type, material group, property class, finish, quantity, and packing method. For export orders, carton labeling, pallet dimensions, shipping marks, and inspection documents should also be confirmed before production.
Confirm full thread or partial thread
DIN 933 and ISO 4017 are normally used for full thread hex bolts, while DIN 931 and ISO 4014 are used for partial thread hex bolts. XZ Fastener also supplies A2 和 A4 六角头螺栓 when buyers need mixed standards in one shipment.
Do not compare only by price per piece
Stainless grade, thread length, finish, inspection documents, sorting level, and export packaging can all affect cost. A low unit price may not include the documentation or packing required for project receiving.
Match the bolt to the environment
A4-70 is commonly chosen for corrosion resistance. For dry indoor work, carbon steel may be more economical; for coastal, wet, chloride, or chemical exposure, A4 stainless is often the safer purchasing choice.
常见采购说明
Clear purchasing language helps the exporter prepare the correct quotation, inspection plan, and packing proposal. Common descriptions include:
- A4-70 stainless steel hex bolts DIN 933 full thread, M10 x 40, plain finish, export carton packing.
- 316 不锈钢ISO 4017 公制六角头螺栓，A4-70，钝化，带配套螺母和垫圈。
- DIN 931 A4-70 partial thread hex bolts for outdoor equipment assembly.
- Stainless steel hex cap screws M6-M24, A4-70, with material test certificate available upon request.
- Carbon steel alternatives such as Grade 8.8 carbon steel hex bolts, zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts from XZ Fastener’s DIN 933 全螺纹六角螺栓系列.
If stainless and carbon steel bolts are combined in one order, each line item should state material, grade, finish, standard, and packing requirement separately.
详细规格表
| 项目 | 规格 | 出口采购备注 |
|---|---|---|
| 产品名称 | A4-70 不锈钢六角螺栓 | Can be supplied as bolts only or with matching stainless nuts and washers. |
| 标准 | DIN 933、ISO 4017、DIN 931、ISO 4014、基于图纸的零件 | 确认需要全螺纹还是部分螺纹。 |
| 直径范围 | Common metric sizes such as M3-M36; larger sizes according to order review | Availability depends on standard, length, and production method. |
| 长度 | 标准长度或根据图纸定制长度 | 用这个 螺栓螺纹长度指南 when checking full thread and half thread requirements. |
| 线程 | 公制粗牙螺纹；可根据要求提供细间距 | Provide pitch if the item is not standard coarse thread. |
| 材质 | A4 / 316-系列奥氏体不锈钢 | 材料文件可以在订单确认前讨论。 |
| 属性等级 | ISO 3506参考下的A4-70 | A4-80 can be reviewed when higher stainless strength is needed. |
| 完成 | 普通、钝化、酸洗钝化、抛光、润滑 | 表面处理应与腐蚀暴露和组装方法相匹配。 |
| 检查 | 根据要求提供尺寸、螺纹规格、视觉外观、材料文件、机械报告 | State third-party inspection or special reports before production. |
| 出口包装 | Bulk cartons, small boxes, pallet packing, labels, barcodes, shipping marks | Packing can be arranged according to destination and order requirement. |
材质及牌号说明
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. A4-70 identifies both the stainless group and the mechanical property class, commonly associated with a minimum tensile strength level of 700 MPa under ISO 3506 reference conditions.
For importers and project buyers, A2 and A4 should not be treated as the same material. A2 is suitable for many indoor and mild outdoor applications, while A4 is normally preferred for marine air, coastal structures, chemical equipment, wastewater facilities, and outdoor exposed assemblies. XZ Fastener provides a practical guide on A2 与 A4 不锈钢紧固件 for material comparison.
A4-70 also differs from Grade 8.8 carbon steel hex bolts. Grade 8.8 carbon steel is often chosen for higher tensile strength, while A4-70 stainless steel is chosen for corrosion resistance and long service life in suitable environments.
Inspection details can be aligned with the purchase order, including dimensions, thread fit, surface condition, quantity, and documents.
表面处理选择指南
A4-70 stainless steel hex bolts are usually exported in plain stainless or passivated finish. Passivation supports a cleaner stainless surface by helping remove free iron contamination. Pickling and passivation may be requested when stronger surface cleaning is required. Lubrication or anti-seize preparation may be discussed where thread galling is a concern.
| 完成 | 典型用途 | 买家须知 |
|---|---|---|
| 普通不锈钢 | General machinery, indoor assemblies, replacement parts | Common and economical for standard stainless bolt orders. |
| 钝化 | Outdoor, coastal, marine air, chemical equipment | Often requested for cleaner surface and improved stainless performance. |
| 酸洗和钝化 | 更苛刻的不锈钢表面清洁要求 | Confirm appearance expectations and acceptance criteria in advance. |
| 润滑 | Assemblies with galling risk or repeated tightening | 使用润滑时扭矩行为会发生变化。 |
| 碳钢涂料 | 镀锌DIN 933 螺栓，黑色氧化DIN 933 螺栓，热镀锌DIN 933 螺栓 | These are generally selected for carbon steel fasteners, not standard A4 stainless bolts. |
For broader coating comparisons, see XZ Fastener’s 紧固件精加工指南.
制造和质量控制
Export supply begins with a confirmed size list, standard, material grade, finish, packing method, destination requirement, and document requirement. 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.
订单审核
XZ Fastener checks the standard, size, thread, finish, tolerance, quantity, shipping marks, and inspection requirements before confirming production. Buyers can also browse broader 紧固件产品 用于匹配螺母、垫圈、螺杆、锚栓和螺钉。
生产控制
Common control points include head dimensions, across-flat size, thread length, thread gauge fit, surface appearance, burr control, grade separation, and packing quantity.
Export preparation
Carton labels, pallet marks, packing lists, and requested inspection documents are prepared according to order requirement. For special sizes or drawing-based parts, 定制紧固件 can be reviewed before quotation.
应用领域
A4-70 stainless steel hex bolts are widely exported for projects and stock programs where corrosion resistance, standard metric dimensions, and wrench-friendly assembly are important.
- 海洋设备和沿海设施
- 化学加工设备
- 户外钢铝组件
- 废水处理系统
- 泵、阀门和管道支撑硬件
- 食品和饮料支撑结构
- Solar mounting and exposed frames
- Machinery maintenance and replacement parts
For submerged seawater, high-temperature equipment, strong chloride chemicals, or critical load-bearing assemblies, engineering confirmation is recommended before selecting A4-70.
如何获得更快的报价
A clear inquiry helps XZ Fastener quote the correct A4-70 stainless steel hex bolts and export packing without repeated clarification. Please provide:
- 尺寸列表，例如M6 x 20、M8 x 30、M10 x 50、M12 x 80。
- 标准，例如DIN 933、ISO 4017、DIN 931、ISO 4014 或图纸编号。
- 材质和牌号，例如 A4-70、A4-80、A2-70 或 316 不锈钢。
- 表面处理要求，例如普通、钝化、酸洗钝化或润滑。
- 每种尺寸的数量和预计的交货时间表。
- Packaging requirement, including bulk carton, small box, pallet, label, barcode, or private packing.
- 检验要求，例如材料证书、尺寸报告、目视检查或第三方检验。
- Destination port, delivery term, and any shipping mark requirements.
对于结构化查询，请使用 请求报价 页或 联系方式 XZ Fastener 包含绘图、照片或电子表格。
常问问题
Is A4-70 suitable for marine environments?
A4-70 is commonly selected for marine air, coastal equipment, and outdoor chloride exposure because it belongs to the 316-family stainless group. For submerged seawater or highly aggressive chemical exposure, the application should be checked before order confirmation.
DIN 933和ISO 4017有什么区别？
Both are commonly used for full thread hex bolts, but they are different standards with dimensional details that should be confirmed in the purchase order. Buyers should state the required standard clearly instead of only writing “hex bolt.”
Can A4-70 stainless steel hex bolts replace Grade 8.8 carbon steel hex bolts?
Not automatically. A4-70 stainless bolts are selected mainly for corrosion resistance, while Grade 8.8 carbon steel hex bolts are selected for higher strength. Joint load, environment, and assembly requirement should be reviewed before substitution.
Can XZ Fastener export matching nuts and washers with the bolts?
Yes. Matching stainless hex nuts, flat washers, spring washers, and assembled packing can be supplied according to the bolt standard, thread, material, and project requirement.
有哪些出口包装选项可供选择？
Bolts can be packed in bulk cartons, small boxes, plastic bags, palletized cartons, or buyer-specified packing with labels, barcodes, and shipping marks according to order requirement.
What documents can be requested before shipment?
买家可根据订单要求索取材料测试证书、尺寸检验报告、装箱单、外观检查记录等文件。生产前应确认文件需求。
Can custom A4-70 hex bolts be supplied from drawings?
Custom length, special thread pitch, modified head dimensions, special marking, and non-standard packaging can be reviewed from drawings, samples, photos, quantity, and application details.
Send Your A4-70 Stainless Hex Bolt Inquiry
Send your size list, finish, quantity, packaging method, and inspection requirements. Include the standard or drawing number, destination port, delivery term, and whether matching nuts and washers are needed. XZ Fastener will review the details and prepare a quotation according to your order requirement.
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