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العربية steel structure Grade 8.8 bolts supplier
XZ Fastener supplies steel structure Grade 8.8 bolts for building frames, warehouses, platforms, guardrails, towers, equipment bases, and general structural steel connections. Grade 8.8 carbon steel bolts offer a practical balance of tensile strength, yield strength, availability, and cost for many construction projects. Buyers can source DIN 931, DIN 933, ISO 4014, ISO 4017, and drawing-based hex bolts with matching nuts, washers, and project packaging. Finishes can include black oxide, zinc plated, yellow zinc, hot dip galvanized, Dacromet-type, or Geomet-type coatings according to order requirement.
Quick Specs
What Buyers Should Know Before Sourcing Steel Structure Grade 8.8 Bolts
Grade 8.8 bolts are commonly used in structural steel connections where higher strength than low-carbon fasteners is required, but where Grade 10.9 or 12.9 may not be necessary. Before ordering, buyers should confirm the bolt standard, diameter, length, thread length, nut grade, washer type, surface finish, and whether the connection is preloaded or non-preloaded. For broader project selection, review fasteners for steel structures.
Because Grade 8.8 is a mechanical property class, not just a product name, the quotation should clearly state material, heat treatment, marking, and inspection requirement. The guide what 8.8 means on a bolt explains the strength concept buyers should confirm before production.
Common Purchasing Descriptions
- Steel structure Grade 8.8 bolts with nuts and washers
- Class 8.8 structural hex bolts for building steel frames
- Grade 8.8 carbon steel hex bolts for construction projects
- Metric hex head bolts for steel structure connection plates
- DIN 933 full thread hex bolts, zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts
Detailed Specifications Table
| Item | Available Options | Buyer Notes |
|---|---|---|
| Product Type | Hex bolts, partial thread bolts, full thread bolts, structural bolt sets, flange bolts, anchor bolts, custom bolts | Confirm whether the bolts are for main steel joints, secondary steelwork, base plates, or equipment frames. |
| Standards | DIN 931, DIN 933, ISO 4014, ISO 4017, ANSI B18.2.1, EN requirements, or custom drawing | Use the project drawing or purchase standard to avoid thread length and head dimension mismatch. |
| Size Range | Metric sizes and selected inch sizes according to order requirement | Send diameter, length, thread pitch, thread length, quantity, and finish by size. |
| Strength Grade | Grade 8.8 / Class 8.8, with other grades available upon request | Marking and mechanical properties should follow the required standard. |
| Material | Carbon steel, medium carbon steel, alloy steel, and specified structural materials | Material and heat treatment should support Grade 8.8 mechanical properties. |
| Surface Finish | Plain, black oxide, zinc plated, yellow zinc, hot dip galvanized, Dacromet-type, Geomet-type, PTFE upon request | For outdoor projects, specify coating thickness, salt spray requirement, and thread fit expectation. |
| Matching Parts | Hex nuts, heavy hex nuts, flat washers, hardened washers, spring washers, structural washers | Nut grade and washer hardness should be matched to bolt strength and connection design. |
| Inspection | Dimension, thread fit, hardness, tensile, proof load, coating thickness, visual finish, packing check | Inspection records can be supplied according to order requirement. |
Material and Grade Explanation
Grade 8.8 bolts are metric high tensile fasteners with defined tensile and yield strength requirements. They are commonly produced from carbon steel or alloy steel with appropriate heat treatment. For structural steelwork, buyers should confirm whether the order requires full thread, partial thread, black finish, zinc plating, or hot dip galvanizing.
Grade confirmation should be handled before production, especially when the order includes mixed bolt sizes or several coating systems. XZ Fastener recommends using the guide on how to confirm bolt grade with suppliers to reduce the risk of wrong marking, wrong material, or incomplete inspection documents.
Surface Finish Selection Guide
Plain and Black Oxide
Plain and black oxide Grade 8.8 bolts are often used for indoor structures, machinery frames, and assemblies that will be painted after installation. Oil protection may be requested for storage.
Zinc Plated
Zinc plated Grade 8.8 bolts are used for controlled environments and light corrosion exposure. White zinc and yellow zinc can be supplied according to order requirement.
Hot Dip Galvanized
Hot dip galvanized Grade 8.8 bolts are selected for outdoor steel structures. Thread fit, matching nuts, and coating build-up should be checked after galvanizing.
Dacromet and Geomet
Zinc flake coatings can be selected for improved corrosion resistance, especially where ordinary zinc plating is not enough or hydrogen embrittlement risk must be considered.
Finish Comparison
For many construction buyers, the choice is between zinc plated and hot dip galvanized. The zinc plated vs hot dip galvanized bolts guide explains practical differences.
Matched Assemblies
When bolts are supplied with nuts and washers, the finish should be compatible across all parts. Thread fit and washer hardness should be checked before shipment.
Manufacturing and Quality Control
Production can include raw material inspection, cutting, cold heading or hot forging, thread rolling or machining, heat treatment, surface preparation, coating, final sorting, and export packing. For steel structure Grade 8.8 bolts, dimensional accuracy, mechanical properties, head marking, thread quality, and coating consistency are important to project purchasing.
XZ Fastener can arrange checks for dimensions, thread pitch, go/no-go gauge fit, hardness, tensile strength, proof load, coating thickness, visual surface, labeling, and packing condition. Buyers can review the fastener quality control process when preparing inspection requirements.
Control Points for Grade 8.8 Structural Orders
- Confirm standard, size, grade marking, and thread length before production.
- Match nut grade and washer type to the Grade 8.8 bolt requirement.
- Specify finish, coating thickness, salt spray requirement, and thread fit requirement.
- Check whether the project needs tensile, hardness, proof load, or coating reports.
- Use labels and pallets that match the size list for easier site receiving.
Applications
Common Project Uses
- Steel buildings, workshops, warehouses, and prefabricated steel frames
- Platforms, stair structures, railings, guardrails, and support brackets
- Equipment bases, machinery frames, and heavy-duty connection plates
- Transmission towers, utility frames, and industrial steel modules
- Bridge auxiliary structures and non-critical support assemblies where Grade 8.8 is specified
Related Product References
- DIN 933 ISO 4017 high tensile hex head bolts for full thread requirements
- Partial thread Grade 8.8 bolts for shear plane and grip length requirements
- Matched nuts, flat washers, spring washers, and custom packaging available according to order requirement
How to Get a Faster Quotation
Send the bolt standard, diameter, length, thread length, material, Grade 8.8 requirement, finish, coating thickness, quantity, matching nut and washer requirements, packaging method, destination, and inspection documents needed. If the order includes several connection types, mark each line by project position or drawing number.
For complete project purchasing, XZ Fastener can quote related fastener products such as nuts, washers, anchor bolts, threaded rods, and custom coated parts together with steel structure Grade 8.8 bolts.
FAQ
What does Grade 8.8 mean for steel structure bolts?
Grade 8.8 is a metric mechanical property class with defined tensile and yield strength requirements. It is commonly used for structural steel connections where medium-high strength is required.
Can XZ Fastener supply Grade 8.8 bolts with nuts and washers?
Yes. Grade 8.8 bolts can be supplied with matching nuts, flat washers, spring washers, or hardened washers according to standard and order requirement.
Which standards are common for Grade 8.8 structural bolts?
Common standards include DIN 931, DIN 933, ISO 4014, ISO 4017, ANSI dimensional requirements, EN requirements, and buyer drawings when custom dimensions are needed.
Can Grade 8.8 bolts be hot dip galvanized?
Yes, hot dip galvanized Grade 8.8 bolts can be supplied when specified. Buyers should confirm coating thickness, thread fit, matching nut condition, and any inspection requirement.
What inspection can be arranged for steel structure Grade 8.8 bolts?
Common checks include dimensions, thread fit, hardness, tensile strength, proof load, coating thickness, visual surface, marking, packaging, and labeling according to order requirement.
What should I include in an RFQ for Grade 8.8 structural bolts?
Please include size list, standard, material, Grade 8.8 requirement, finish, quantity, packaging, inspection requirements, nut and washer needs, coating thickness, and any project drawings.
Send Your Steel Structure Grade 8.8 Bolt Inquiry
For a faster quotation, send your size list, finish, quantity, packaging, and inspection requirements. Please also include bolt standard, diameter, length, thread length, coating thickness, matching nuts, washer type, project drawings, and any marking or document needs.