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العربية A4-80 Stainless Steel Bolts Manufacturer for High-Strength Corrosion-Resistant Assemblies
XZ Fastener manufactures A4-80 stainless steel bolts for buyers who need higher tensile strength with improved corrosion resistance in marine, chemical, outdoor, water treatment, and equipment assembly projects. A4-80 bolts are commonly requested in 316 stainless steel for metric hex head bolts, DIN 933 full thread hex bolts, DIN 931 partial thread bolts, socket bolts, studs, and drawing-based parts. Available supply can include plain, passivated, polished, waxed thread, or special surface treatment according to order requirement. Send size, length, thread pitch, quantity, packaging, and inspection needs for accurate quotation.
Quick Specs
What Buyers Should Know Before Sourcing A4-80 Stainless Steel Bolts
A4-80 stainless steel bolts are selected when a project needs both corrosion resistance and higher strength than common A4-70 stainless bolting. The “A4” material group is widely associated with molybdenum-bearing stainless steel such as 316, while “80” refers to the higher strength class. For a practical comparison of stainless bolt strength classes, buyers can review XZ Fastener’s guide to A2-70, A4-70, and A4-80 stainless steel bolts.
Before ordering, confirm whether the part is a full thread bolt, partial thread bolt, socket bolt, flange bolt, stud bolt, or special drawing part. For hex head requirements, buyers often specify 316 stainless steel hex head full thread bolts in DIN 933 or ISO 4017 style.
Procurement tip: A4-80 is not a direct substitute for every high-tensile carbon steel bolt. If the project requires Grade 8.8 carbon steel hex bolts, zinc plated DIN 933 bolts, black oxide DIN 933 bolts, or hot dip galvanized DIN 933 bolts, confirm the mechanical and corrosion requirements before switching to stainless steel.
Common Purchasing Descriptions
Purchase orders and drawings may describe A4-80 stainless steel bolts in several ways. XZ Fastener can check the wording against the requested standard, material, thread, and application conditions.
For carbon steel project alternatives, buyers may also compare DIN 933 full thread hex bolts in Grade 8.8, 10.9, or 12.9 with zinc plated, black oxide, or hot dip galvanized finish.
Detailed Specifications Table
| Specification Item | Available Options and Buyer Notes |
|---|---|
| Product name | A4-80 stainless steel bolts, 316 stainless steel A4-80 bolts, A4-80 hex bolts, A4-80 socket bolts. |
| Standards | DIN 933, ISO 4017, DIN 931, ISO 4014, DIN 912, ISO 4762, ASME inch sizes, or custom drawing. |
| Size range | Common metric sizes include M3 to M36. Larger sizes and special thread forms can be reviewed according to order requirement. |
| Thread type | Metric coarse thread, metric fine thread, UNC, UNF, or specified thread pitch. |
| Thread length | Full thread, partial thread, or custom thread length based on drawing and assembly requirement. |
| Material group | A4 stainless steel, commonly requested as 316 / SUS316 / 1.4401 equivalent material. |
| Strength class | A4-80, selected where higher stainless steel bolt strength is required. |
| Finish | Plain, passivated, polished, waxed, anti-seize treated, PTFE coated, or other surface finish upon request. |
| Matching parts | A4 stainless steel nuts, flat washers, spring washers, lock nuts, heavy hex nuts, or complete bolt-nut-washer sets. |
| Inspection | Dimension check, thread gauge, tensile test, hardness reference, material report, surface inspection, and packaging verification. |
| Packaging | Bulk cartons, small boxes, bags, pallets, labels, barcodes, and private label packing according to order requirement. |
Common A4-80 Bolt Forms
| Bolt Type | Typical Standard | Common Buyer Use |
|---|---|---|
| Full thread hex bolt | DIN 933 / ISO 4017 | General machinery, brackets, pipe supports, and adjustable assemblies. |
| Partial thread hex bolt | DIN 931 / ISO 4014 | Shear-bearing joints and assemblies requiring an unthreaded shank section. |
| Socket head cap screw | DIN 912 / ISO 4762 | Compact machinery and equipment where internal hex drive is preferred. |
| Stud bolt or threaded rod | Drawing or project specification | Flange connections, equipment foundations, and custom fastening points. |
| Custom bolt | Drawing or sample | OEM assemblies with non-standard head, shank, thread, or surface requirements. |
Material and Grade Explanation
A4 stainless steel is normally selected for environments where ordinary carbon steel or A2 stainless may not provide enough corrosion resistance. A4-80 provides a higher strength level than A4-70, making it useful for demanding assemblies where both load and corrosion resistance matter. For corrosion-focused material selection, buyers can compare A2 vs A4 fasteners before confirming the final grade.
When bolts are installed with stainless nuts and washers, material matching matters. Mixed materials may create galling, corrosion, or assembly issues if the installation method is not controlled. XZ Fastener’s guide on matching stainless steel bolts, nuts, and washers can help buyers prepare a cleaner inquiry.
Surface Finish Selection Guide
A4-80 stainless steel bolts are often supplied plain, passivated, or polished. Passivation can improve surface cleanliness after manufacturing. Waxed thread or anti-seize treatment may be requested to reduce galling during tightening, especially for stainless-to-stainless assemblies.
Unlike carbon steel fasteners, A4-80 stainless bolts are not usually ordered as zinc plated parts. If the project allows carbon steel, options such as zinc plated DIN 933 bolts, black oxide DIN 933 bolts, or hot dip galvanized DIN 933 bolts may be considered. For broader finish comparison, see the surface finish comparison chart.
Manufacturing and Quality Control
A4-80 stainless steel bolts can be manufactured through cold heading, hot forging, machining, thread rolling, thread cutting, cleaning, passivation, and final packaging depending on diameter, length, strength requirement, and order quantity. Small metric hex head bolts may follow a different process route from large custom bolts or long special fasteners.
Quality control can include raw material verification, head dimension check, shank diameter check, thread go/no-go gauge testing, tensile testing, surface inspection, marking review, and final packaging confirmation. XZ Fastener can also review drawing-based custom fasteners when standard A4-80 bolts cannot meet the required geometry or assembly condition.
For additional process and inspection references, buyers can browse XZ Fastener’s technical guides.
Applications
- Marine equipment, dock hardware, offshore platforms, and coastal outdoor structures.
- Chemical processing equipment, pumps, valves, pipe supports, and tanks.
- Water treatment systems, filtration equipment, and wastewater facilities.
- Food machinery, packaging equipment, and washdown assembly areas.
- Solar mounting, outdoor machinery, and corrosion-prone structural accessories.
- OEM equipment where higher-strength stainless steel bolting is specified by drawing.
How to Get a Faster Quotation
To help XZ Fastener prepare a clear quotation, send the following details with your inquiry:
- Size list, length, thread pitch, and quantity for each item.
- Required standard, such as DIN 933, ISO 4017, DIN 931, ISO 4014, DIN 912, or custom drawing.
- Material and grade, such as A4-80, 316, SUS316, or a specified material number.
- Surface finish, such as plain, passivated, polished, waxed thread, anti-seize, or special coating.
- Matching nuts, washers, lock nuts, or complete assembly requirements.
- Packaging method, carton weight limit, label format, barcode, pallet, and private label requirements.
- Inspection requirements, material reports, sample approval needs, and delivery schedule.
You can request a quote with a spreadsheet, drawing, sample photo, or current purchase specification.
FAQ
What does A4-80 mean for stainless steel bolts?
A4 refers to a corrosion-resistant stainless steel material group commonly associated with 316 stainless steel, while 80 indicates a higher strength class with 800 MPa minimum tensile strength under common stainless fastener classification.
Can A4-80 bolts be supplied as DIN 933 full thread hex bolts?
Yes. A4-80 bolts can be supplied as DIN 933 full thread hex bolts or ISO 4017 metric hex head bolts according to size, length, and order requirement.
What is the difference between A4-70 and A4-80 bolts?
Both are A4 stainless steel bolt classes, but A4-80 has a higher strength level than A4-70. Buyers should confirm whether the application requires higher strength, corrosion resistance, or both.
Are A4-80 stainless steel bolts suitable for marine use?
A4 stainless steel is commonly selected for marine and chloride-related environments, but final suitability depends on chloride concentration, temperature, crevice conditions, installation method, and maintenance plan.
Can A4-80 bolts be supplied with matching nuts and washers?
Yes. Matching A4 stainless nuts, flat washers, spring washers, lock nuts, or complete bolt-nut-washer sets can be supplied according to order requirement.
How can galling be reduced during installation?
Galling risk can be reduced by using suitable matching components, avoiding excessive installation speed, applying waxed thread or anti-seize treatment when required, and following the approved tightening method.
Send Your A4-80 Stainless Steel Bolt Inquiry
For faster pricing, send your size list, finish, quantity, packaging method, and inspection requirements. XZ Fastener can review A4-80 stainless steel bolts, DIN 933 full thread hex bolts, metric hex head bolts, socket bolts, studs, matching nuts and washers, and drawing-based parts according to your purchasing plan. To discuss project details, contact XZ Fastener.