A4-70 stainless steel hex bolts exporter
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 stainless steel hex bolts with packing, labeling, inspection, and export document requirements confirmed before shipment.
Стандарт
DIN 933 / ISO 4017 full thread; DIN 931 / ISO 4014 optional
Strength
A4-70; A4-80 available upon request
Материал
A4 / 316-family austenitic stainless steel
Finish
Plain, passivated, pickled and passivated, lubricated
Приложение
Marine fittings, outdoor structures, machinery, chemical equipment
What Buyers Should Know Before Sourcing A4-70 Stainless Steel Hex Bolts
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 and A4 hex head bolts 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.
Common Purchasing Descriptions
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 stainless steel ISO 4017 metric hex head bolts, A4-70, passivated, with matching nuts and washers.
- 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 full thread hex bolt range.
If stainless and carbon steel bolts are combined in one order, each line item should state material, grade, finish, standard, and packing requirement separately.
Detailed Specifications Table
| Предмет | Спецификация | Export Purchasing Notes |
|---|---|---|
| Product name | A4-70 stainless steel hex bolts | Can be supplied as bolts only or with matching stainless nuts and washers. |
| Стандарты | DIN 933, ISO 4017, DIN 931, ISO 4014, drawing-based parts | Confirm whether full thread or partial thread is required. |
| Diameter range | Common metric sizes such as M3-M36; larger sizes according to order review | Availability depends on standard, length, and production method. |
| Length | Standard lengths or custom lengths according to drawings | Use this bolt thread length guide when checking full thread and half thread requirements. |
| Thread | Metric coarse thread; fine pitch available upon request | Provide pitch if the item is not standard coarse thread. |
| Материал | A4 / 316-family austenitic stainless steel | Material documents can be discussed before order confirmation. |
| Property class | A4-70 under ISO 3506 reference | A4-80 can be reviewed when higher stainless strength is needed. |
| Finish | Plain, passivated, pickled and passivated, polished, lubricated | Finish should match corrosion exposure and assembly method. |
| Inspection | Dimensions, thread gauges, visual appearance, material documents, mechanical reports upon request | State third-party inspection or special reports before production. |
| Export packing | Bulk cartons, small boxes, pallet packing, labels, barcodes, shipping marks | Packing can be arranged according to destination and order requirement. |
Material and Grade Explanation
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 vs A4 stainless steel fasteners 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.
Surface Finish Selection Guide
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.
| Finish | Typical Use | Buyer Note |
|---|---|---|
| Plain stainless | General machinery, indoor assemblies, replacement parts | Common and economical for standard stainless bolt orders. |
| Passivated | Outdoor, coastal, marine air, chemical equipment | Often requested for cleaner surface and improved stainless performance. |
| Pickled and passivated | More demanding stainless surface cleaning requirements | Confirm appearance expectations and acceptance criteria in advance. |
| Lubricated | Assemblies with galling risk or repeated tightening | Torque behavior changes when lubrication is used. |
| Carbon steel coatings | Zinc plated DIN 933 bolts, black oxide DIN 933 bolts, hot dip galvanized DIN 933 bolts | These are generally selected for carbon steel fasteners, not standard A4 stainless bolts. |
For broader coating comparisons, see XZ Fastener’s fastener finish guide.
Manufacturing and Quality Control
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.
Order review
XZ Fastener checks the standard, size, thread, finish, tolerance, quantity, shipping marks, and inspection requirements before confirming production. Buyers can also browse broader fastener products for matching nuts, washers, threaded rods, anchors, and screws.
Production control
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, custom fasteners can be reviewed before quotation.
Приложения
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.
- Marine equipment and coastal facilities
- Chemical processing equipment
- Outdoor steel and aluminum assemblies
- Wastewater treatment systems
- Pump, valve, and pipe support hardware
- Food and beverage support structures
- 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.
How to Get a Faster Quotation
A clear inquiry helps XZ Fastener quote the correct A4-70 stainless steel hex bolts and export packing without repeated clarification. Please provide:
- Size list, such as M6 x 20, M8 x 30, M10 x 50, M12 x 80.
- Standard, such as DIN 933, ISO 4017, DIN 931, ISO 4014, or drawing number.
- Material and grade, such as A4-70, A4-80, A2-70, or 316 stainless steel.
- Finish requirement, such as plain, passivated, pickled and passivated, or lubricated.
- Quantity for each size and expected delivery schedule.
- Packaging requirement, including bulk carton, small box, pallet, label, barcode, or private packing.
- Inspection requirements, such as material certificate, dimensional report, visual inspection, or third-party inspection.
- Destination port, delivery term, and any shipping mark requirements.
For a structured inquiry, use the request a quote page or contact XZ Fastener with drawings, photos, or a spreadsheet.
Часто задаваемые вопросы
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.
What is the difference between DIN 933 and ISO 4017?
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.
What export packing options are available?
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?
Buyers may request material test certificates, dimensional inspection reports, packing lists, visual inspection records, and other documents according to order requirement. Document needs should be confirmed before production.
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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