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العربية DIN 6921 hex flange bolts wholesale supplier
XZ Fastener supplies DIN 6921 hex flange bolts for wholesale buyers, OEM assembly, equipment maintenance, machinery builders, and industrial distributors. These metric flange bolts combine a hex head with an integrated bearing flange, helping spread clamping load without adding a separate washer in many assemblies. For accurate sourcing, buyers should confirm diameter, length, thread pitch, strength class, flange style, surface finish, and packing method before production. Carbon steel, alloy steel, and stainless steel options can be supplied according to order requirement, with inspection documents available upon request.
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Quick Specs
What Buyers Should Know Before Sourcing DIN 6921 Hex Flange Bolts
DIN 6921 flange bolts are often selected because the flange gives a wider bearing surface than a standard hex head. That helps reduce local surface pressure and can simplify assembly where a separate flat washer is not preferred.
Still, a flange bolt is not an automatic substitute for every hex bolt and washer combination. Buyers should check the mating surface, hole diameter, clamping load, clearance around the head, and whether the flange should be serrated or non-serrated. If the same bill of materials also includes metric hex head bolts, keep the DIN 6921 items clearly separated from DIN 933 full thread hex bolts to avoid warehouse mixing.
Common Purchasing Descriptions
A clear RFQ helps the supplier quote faster and prevents avoidable confirmation rounds. Typical descriptions include:
- DIN 6921 hex flange bolt, M8 x 25, Class 8.8, zinc plated, serrated flange, carton and pallet packing.
- DIN 6921 hex flange bolt, M10 x 30, Class 10.9, black oxide, non-serrated flange, inspection report required.
- DIN 6921 flange bolt, M6 x 20, A2-70 stainless steel, passivated finish, small box packing.
- DIN 6921 metric flange bolts, assorted sizes, bulk order, mixed finish list according to buyer schedule.
For related categories, buyers can also review XZ Fastener’s fastener products and high-strength fasteners.
Detailed Specifications Table
| Item | Typical Requirement | Buyer Checkpoint |
|---|---|---|
| Product Type | DIN 6921 hex flange bolts | Confirm serrated or non-serrated flange before production. |
| Size Range | Common metric sizes such as M5 to M20; other sizes according to order requirement. | Specify diameter, length, thread pitch, and tolerance if critical. |
| Thread | Metric coarse thread is common; fine thread may be available by requirement. | Do not assume pitch when ordering mixed metric sizes. |
| Strength Class | 8.8, 10.9, 12.9 for carbon or alloy steel; A2-70/A4-70 for stainless steel. | Match bolt grade to joint design and mating nut or threaded hole. |
| Surface Finish | Zinc plated, black oxide, zinc flake, hot dip galvanized, plain, passivated stainless. | Confirm coating thickness where thread fit or assembly torque is sensitive. |
| Documents | Dimensional report, material certificate, coating report, hardness test, tensile test upon request. | State documentation needs before quotation, not after shipment. |
| Packing | Bulk carton, small box, bag packing, label-controlled cartons, export pallet. | Use part numbers and batch labels for wholesale and OEM receiving control. |
Material and Grade Explanation
Carbon steel Class 8.8 is common for general machinery and brackets. Class 10.9 or 12.9 may be selected where higher tensile strength is required, but the mating thread and tightening method must also be reviewed.
Stainless steel A2 or A4 is used when corrosion resistance is more important than high carbon steel strength. A4 stainless is usually preferred for marine, chemical, or outdoor exposure.
If your purchasing list includes Grade 8.8 carbon steel hex bolts, DIN 933 full thread hex bolts, or other standard fasteners, the grade and finish should be written line by line to prevent substitution errors.
Surface Finish Selection Guide
| Finish | Common Use |
|---|---|
| Zinc Plated | General indoor or light-duty corrosion protection; common for wholesale stock. |
| Black Oxide | Machinery appearance and light protection when oiling is acceptable. |
| Zinc Flake | Improved corrosion resistance with controlled coating thickness for many assemblies. |
| Hot Dip Galvanized | Outdoor and structural use where heavier coating is acceptable. |
| Passivated Stainless | Stainless steel bolts where surface cleanliness and corrosion resistance matter. |
For broader finish options, see XZ Fastener’s coated fasteners. Buyers ordering zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts in the same shipment should use separate item codes and labels.
Manufacturing and Quality Control
DIN 6921 hex flange bolts require stable control of head forming, flange diameter, thread rolling, heat treatment, surface finish, and final sorting. For wholesale supply, consistency across cartons matters as much as the sample approval.
Key Control Points
- Confirm the applicable DIN 6921 drawing and any buyer-specific deviations.
- Check raw material grade and heat number traceability when required.
- Control heading quality, flange shape, head height, and socket-free hex geometry.
- Verify thread pitch, thread length, go/no-go gauge fit, and surface defects.
- Apply coating according to order requirement and check appearance, adhesion, and thread function.
- Pack by size, grade, finish, and item code to reduce receiving and assembly errors.
For custom dimensional requirements, XZ Fastener can review drawings through its customized service. For standard cross-checking, the DIN and ISO fastener standards guide is useful when buyers compare DIN, ISO, and project specifications.
Applications
DIN 6921 hex flange bolts are commonly used where fast assembly, load distribution, and a clean bearing surface are important. Typical applications include:
- Machinery covers, brackets, and equipment frames.
- Automotive, trailer, and agricultural equipment components.
- Electrical enclosures, guard rails, and light steel assemblies.
- OEM production lines requiring repeatable part feeding and simple installation.
- Distributor stock programs where metric flange bolts are sold by size, grade, and finish.
How to Get a Faster Quotation
Wholesale buyers can shorten quotation time by sending a complete purchase description at the first inquiry.
| Information Needed | Example |
|---|---|
| Size list | M6 x 16, M8 x 25, M10 x 30, M12 x 40 |
| Grade and material | Class 8.8 carbon steel, Class 10.9 alloy steel, A2-70 stainless steel |
| Finish | Zinc plated, black oxide, zinc flake, hot dip galvanized, plain |
| Quantity | Pieces per size, annual demand, or container order plan |
| Packing | Bulk cartons, small boxes, barcode labels, pallet requirement |
| Inspection | Material certificate, hardness report, dimensional report, coating report |
For order review, buyers can contact XZ Fastener with drawings, photos, or an itemized RFQ sheet.
FAQ
What is a DIN 6921 hex flange bolt?
It is a metric hex head bolt with an integrated flange under the head. The flange provides a wider bearing surface and can reduce the need for a separate washer in many assemblies.
Can DIN 6921 flange bolts replace DIN 933 hex bolts?
Not automatically. DIN 933 full thread hex bolts and DIN 6921 flange bolts have different head and bearing designs. The joint surface, clearance, hole size, and tightening method should be checked before replacement.
Are DIN 6921 bolts supplied with serrated flanges?
They can be supplied as serrated or non-serrated according to order requirement. Buyers should specify this clearly because serrations affect the mating surface and loosening behavior.
Which grades are commonly ordered for wholesale supply?
Class 8.8 is common for general industrial use. Class 10.9 and 12.9 are used for higher-strength applications. Stainless steel A2-70 and A4-70 can be supplied when corrosion resistance is required.
What finishes are available for DIN 6921 hex flange bolts?
Common finishes include zinc plated, black oxide, plain, zinc flake, hot dip galvanized, and passivated stainless steel. The correct finish depends on corrosion exposure, thread fit, appearance, and cost target.
What should I send for a wholesale quotation?
Please send the size list, grade, material, finish, quantity, flange style, packing method, and inspection requirements. A drawing or approved sample is helpful when the order has non-standard details.
Send Your DIN 6921 Hex Flange Bolt Inquiry
To receive a practical quotation, send your size list, finish, quantity, packaging method, and inspection requirements. XZ Fastener can review DIN 6921 wholesale orders together with related metric hex head bolts, zinc plated DIN 933 bolts, black oxide DIN 933 bolts, hot dip galvanized DIN 933 bolts, and other industrial fasteners according to your purchasing schedule.
Request a Quote from XZ Fastener