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DIN 933 Grade 8.8 Hex Bolts Manufacturer
XZ Fastener manufactures DIN 933 Grade 8.8 hex bolts for buyers who need full thread metric bolts with stable dimensions, controlled mechanical performance, practical surface finish options and export-ready packaging. The content below helps engineers, sourcing managers and distributors confirm specifications before requesting a manufacturer quotation.
What Buyers Should Know Before Sourcing DIN 933 Grade 8.8 Hex Bolts
A DIN 933 Grade 8.8 hex bolt is not just a generic hex bolt with a long product name. DIN 933 defines a metric hexagon head screw threaded up to the head, while Grade 8.8 describes the mechanical strength class normally associated with quenched and tempered carbon steel fasteners. For buyers, the most important sourcing question is whether the manufacturer can keep the thread fit, head dimensions, surface treatment and batch consistency stable across repeat orders.
The full thread design makes DIN 933 bolts useful when assembly thickness varies, when nut position needs adjustment, or when the threaded portion must pass through the clamped parts. Compared with a partially threaded DIN 931 bolt, DIN 933 gives more thread engagement flexibility, but the final selection should still consider shear area, clamping requirement and engineering specification.
Common Purchasing Descriptions
Buyers may describe this product as DIN 933 full thread hex bolts, Grade 8.8 carbon steel hex bolts, metric hex head bolts, zinc plated DIN 933 bolts, black oxide DIN 933 bolts or hot dip galvanized DIN 933 bolts. These descriptions usually point to the same core requirement: a full thread metric hex bolt with Grade 8.8 strength and a finish suitable for the working environment.
DIN 933 Grade 8.8 Hex Bolt Specifications
Use the table below as a sourcing brief for quotation and technical confirmation. Final production should follow the agreed standard, drawing, sample or purchase specification.
| Product Name | DIN 933 Grade 8.8 Hex Bolts; metric full thread hex head bolts |
|---|---|
| Standard | DIN 933, hexagon head screws threaded up to the head; product grade and tolerance according to order requirement |
| Material | Carbon steel or medium carbon steel suitable for Grade 8.8 mechanical property requirements |
| Mechanical Class | Grade 8.8; commonly selected for medium to high strength industrial fastening |
| Thread Type | Metric full thread; coarse thread as common supply, fine thread by inquiry |
| Common Sizes | M5, M6, M8, M10, M12, M16, M20, M24 and larger metric sizes by production capability and order quantity |
| Common Lengths | Standard DIN lengths or custom length based on drawing, assembly thickness and nut engagement requirement |
| Surface Finish | Plain, zinc plated, yellow zinc, black oxide, phosphate, hot dip galvanized, Dacromet, Geomet or custom anti-corrosion coating |
| Inspection Options | Dimension check, thread gauge, visual surface check, hardness test, tensile test, coating thickness or salt spray report when required |
| Packaging | Bulk carton, small box, woven bag, pallet, wooden case, barcode label or private label export packaging |
Why DIN 933 Grade 8.8 Bolts Are Chosen
Buyers usually search for DIN 933 Grade 8.8 hex bolts when they need a standard metric bolt with predictable strength and full thread engagement. The value is not only the bolt itself, but also whether the manufacturer can help avoid mismatch between grade, finish, application and packaging.
Full Thread Engagement
Thread runs close to the head, making DIN 933 useful where the clamped thickness varies or where longer thread contact is required.
Grade 8.8 Strength
Grade 8.8 is widely specified for machinery, equipment and structural assemblies that require stronger fastening than low grade bolts.
Flexible Finish Selection
Zinc plating, black oxide and hot dip galvanizing can be selected according to appearance, corrosion exposure and project requirement.
Manufacturing Control Points
For DIN 933 Grade 8.8 bolts, poor control may show up as inconsistent thread fit, damaged coating, mixed lengths, unclear head marking or unstable mechanical properties. XZ Fastener treats these as production and inspection control points, not after-sales problems.
- Material selection suitable for Grade 8.8 heat treatment and strength requirements.
- Cold heading and thread rolling control for head shape, thread profile and dimensional stability.
- Heat treatment process review for strength, hardness and batch consistency.
- Surface treatment selection based on corrosion exposure, assembly method and visual requirement.
- Packaging separation by size, finish and batch to reduce warehouse and installation mistakes.
Quality Documents Buyers May Request
Not every order needs the same inspection package. For standard stock or low-risk assembly, visual and dimensional checks may be enough. For engineering projects, buyers may request more detailed reports before shipment.
- Dimensional inspection report for diameter, length, head size and thread.
- Material certificate or heat number traceability where applicable.
- Hardness or tensile test report for Grade 8.8 confirmation.
- Coating thickness report for zinc plated or galvanized bolts.
- Salt spray test report when corrosion resistance is specified.
Surface Finish Selection Guide
Finish selection directly affects corrosion resistance, assembly feel, appearance and cost. A manufacturer should not quote DIN 933 Grade 8.8 hex bolts without understanding the working environment.
| Zinc Plated | Common economical finish for indoor or mild environments. Available in white zinc, blue zinc or yellow zinc depending on buyer preference. |
|---|---|
| Black Oxide | Often selected for darker appearance and light protection. Suitable when visual consistency and controlled storage conditions are important. |
| Hot Dip Galvanized | Preferred for outdoor and higher corrosion exposure. Buyers should confirm thread fit and nut compatibility after galvanizing. |
| Phosphate and Oil | Used where assembly lubrication, temporary rust prevention or dark surface appearance is required. |
| Dacromet or Geomet | Suitable for specific anti-corrosion requirements when buyers need controlled coating performance and project approval. |
Applications for DIN 933 Grade 8.8 Hex Bolts
DIN 933 Grade 8.8 hex bolts are used across industrial assemblies where metric full thread fastening and moderate to high strength are required. The exact bolt should always be confirmed against the assembly load and project specification.
Machinery Assembly
Frames, brackets, guards, equipment housings, replacement parts and adjustable machine assemblies.
Steel Structure
Secondary connections, support frames, platforms and steel components where Grade 8.8 metric bolts are specified.
Construction and Maintenance
Project installation, repair stock, MRO procurement and general fastening for industrial contractors.
Automotive and Equipment
Non-critical vehicle equipment, machinery accessories and fabricated components requiring repeatable metric fastening.
Pipe and Flange Support
Support systems, brackets and service equipment where bolt grade, coating and packaging need clear confirmation.
Distributor Inventory
Standard sizes packed by carton, small box or pallet for wholesalers and fastener distributors.
How to Get a Faster and More Accurate Quotation
Many delays in bolt sourcing happen because the first inquiry only says “DIN 933 Grade 8.8 hex bolt price.” A useful RFQ should describe the bolt in a way production, purchasing and inspection teams can all understand.
Confirm the standard and grade
State DIN 933, Grade 8.8 and whether the order must follow a particular project specification or drawing revision.
List diameter, length and thread
Use clear size descriptions such as M10 x 40, M16 x 80 or M20 x 100. Mention coarse thread or fine thread if required.
Select the finish
Choose zinc plated, black oxide, hot dip galvanized, plain or custom coating based on corrosion exposure and appearance requirements.
Define packaging and inspection
Tell us if you need small boxes, pallet labels, private labels, material certificate, hardness report, coating thickness report or salt spray test.
FAQ: DIN 933 Grade 8.8 Hex Bolts
What is a DIN 933 Grade 8.8 hex bolt?
It is a metric hex head bolt threaded up to the head according to the DIN 933 standard. Grade 8.8 refers to the strength class commonly used for carbon steel industrial fasteners.
Is DIN 933 the same as DIN 931?
No. DIN 933 is full thread, while DIN 931 is partial thread. If the assembly needs thread along almost the entire shank, DIN 933 is usually the correct starting point.
What materials are used for Grade 8.8 bolts?
Grade 8.8 bolts are generally made from suitable carbon steel or medium carbon steel and heat treated to meet the mechanical property requirement. Final material should be confirmed by order specification.
Which finish is best for outdoor DIN 933 bolts?
Hot dip galvanized or approved anti-corrosion coatings are commonly considered for outdoor exposure. Zinc plated bolts are more often used for indoor or mild environments.
Can XZ Fastener supply custom DIN 933 bolt packaging?
Yes. Packaging can be arranged as bulk cartons, small boxes, pallets, wooden cases, barcode labels or private label packaging based on the buyer’s distribution and warehouse needs.
Source DIN 933 Grade 8.8 Hex Bolts from XZ Fastener
Send your size list, finish, quantity, packaging and inspection requirements for a practical manufacturer quotation.