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Русский carbon steel flange bolts factory
XZ Fastener manufactures carbon steel flange bolts for industrial buyers who need hex flange head bolts with stable bearing surface, clean threads, and reliable batch consistency. Flange bolts can be supplied in metric sizes, full thread or partial thread, with serrated or non-serrated flange options according to order requirement. Common finishes include zinc plated, yellow zinc, black oxide, phosphate, and hot dip galvanized coatings. Buyers use carbon steel flange bolts for machinery, automotive brackets, equipment frames, construction hardware, and maintenance stock. XZ Fastener also supports related flange bolts and nuts inquiries with matching nuts, washers, packing, and inspection details confirmed before production.
قياسي
DIN 6921, ISO 4162, JIS / IFI types, drawing-based parts
Strength
Class 4.8, 8.8, 10.9; other grades by order review
مادة
Carbon steel, medium carbon steel, alloy carbon steel options
Finish
Zinc plated, black oxide, phosphate, HDG, plain oil
تطبيق
Machinery, automotive brackets, steel frames, equipment assembly
What Buyers Should Know Before Sourcing Carbon Steel Flange Bolts
Carbon steel flange bolts combine a hex head with an integrated flange bearing surface. The flange can reduce the need for a separate flat washer in some assemblies, but buyers should still confirm whether the application requires a serrated flange, non-serrated flange, larger bearing diameter, specific head marking, or matching nut.
Confirm standard and flange style
DIN 6921 and ISO 4162 are common references for metric hex flange bolts, while JIS, IFI, and drawing-based parts may use different head, flange, and thread dimensions. For related product comparison, review this guide to bolt types including flange bolts.
Match strength to the joint
Class 8.8 carbon steel flange bolts are widely used for machinery and equipment assemblies. Higher strength classes may need heat treatment control and coating risk review, especially when electroplated finishes are required.
Separate flange bolts from hex bolts
Flange bolts are different from DIN 933 full thread hex bolts and standard metric hex head bolts. If the purchase order includes Grade 8.8 carbon steel hex bolts, zinc plated DIN 933 bolts, black oxide DIN 933 bolts, or hot dip galvanized DIN 933 bolts, those should be listed as separate line items.
Common Purchasing Descriptions
Clear purchasing descriptions help avoid wrong flange type, incorrect thread length, or unsuitable finish. Typical buyer wording includes:
- DIN 6921 carbon steel flange bolts, M8 x 25, Class 8.8, zinc plated, serrated flange.
- Hex flange head bolts, carbon steel, M10 x 30, non-serrated flange, black oxide finish.
- Metric carbon steel flange bolts, Class 10.9, phosphate and oil finish for machinery assembly.
- Flange bolts with full thread, yellow zinc plated, bulk carton packing and pallet labels.
- Drawing-based carbon steel flange bolts with specified flange diameter, head height, and thread length.
- Separate carbon steel hex bolt items such as DIN 933 full thread hex bolts, zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts when a project uses multiple bolt types.
If the order includes flange bolts, hex nuts, washers, and standard hex bolts, separate every item by standard, size, grade, finish, packing unit, and inspection requirement.
Detailed Specifications Table
| عنصر | المواصفات | Buyer Notes |
|---|---|---|
| Product name | Carbon steel flange bolts | Also called hex flange bolts, flange head bolts, or hex washer flange bolts. |
| Common standards | DIN 6921, ISO 4162, JIS B 1189, IFI types, drawing-based parts | State the exact standard because flange diameter and head dimensions may differ. |
| Diameter range | Common metric sizes such as M5-M20; other sizes reviewed by order | Actual range depends on length, grade, flange type, and production method. |
| Length | Standard lengths or custom lengths according to drawings | Confirm full thread, partial thread, or exact thread length. |
| Flange type | Serrated flange, non-serrated flange, custom flange diameter | Serrations can improve resistance to loosening but may mark the mating surface. |
| مادة | Low carbon steel, medium carbon steel, alloy carbon steel options | Material should match grade, forming, heat treatment, and finish requirements. |
| Strength | Class 4.8, 8.8, 10.9, 12.9 by order review | For high-strength items, confirm coating, hydrogen embrittlement risk, and inspection documents. |
| Finish | Plain, zinc plated, yellow zinc, black oxide, phosphate, hot dip galvanized | Finish should match corrosion exposure, thread fit, and assembly method. |
| Inspection | Head dimensions, flange diameter, serration form, thread gauges, finish appearance, coating thickness | Special inspection reports can be discussed before production. |
| Packing | Bulk cartons, small boxes, bags, pallet packing, labels, barcodes, private packing | Can be supplied according to order requirement. |
Material and Grade Explanation
Carbon steel flange bolts are selected when buyers need a cost-effective bolt with an integrated bearing surface. Class 4.8 is common for general fastening, while Class 8.8 is widely used for machinery, automotive brackets, and equipment frames. Class 10.9 and higher grades may be reviewed when higher clamp load is required.
Grade selection should consider material, heat treatment, proof load, mating nut grade, tightening method, and coating process. For buyers comparing Class 8.8 flange bolts with Grade 8.8 carbon steel hex bolts, this guide on what 8.8 means on a bolt provides useful background.
The flange surface can distribute load over a wider area than a standard hex head. However, it does not automatically replace all washer requirements; the mating material, hole size, slot shape, and surface hardness should still be checked.
Inspection can include head dimensions, flange diameter, serration condition, thread fit, coating thickness, quantity, and packing marks.
Surface Finish Selection Guide
Finish selection depends on the working environment, target service life, assembly method, and appearance requirement. Carbon steel flange bolts are commonly supplied with zinc plating, yellow zinc, black oxide, phosphate and oil, hot dip galvanizing, or plain oil protection.
| Finish | Typical Use | Buyer Note |
|---|---|---|
| Plain / oil | Indoor storage, later finishing, short-term protection | Not recommended for long outdoor exposure without additional protection. |
| Zinc plated | General machinery, brackets, equipment frames, light outdoor use | Common finish for carbon steel flange bolts and hardware stock. |
| Yellow zinc | Visible hardware, industrial stock, automotive-style assemblies | Confirm appearance and corrosion requirement before ordering. |
| أكسيد أسود | Indoor machinery, appearance-focused assemblies, light protection with oil | Black oxide is not the same as heavy outdoor corrosion protection. |
| Phosphate and oil | Automotive, machinery, assemblies needing controlled friction | Friction behavior should be considered when torque values are specified. |
| Hot dip galvanized | Outdoor steel, construction, utility frames, heavier corrosion exposure | Thicker coating may affect thread fit and flange appearance. |
For coating comparisons, review XZ Fastener’s fastener coating guide.
Manufacturing and Quality Control
Factory production begins with review of the standard, diameter, length, thread pitch, flange type, serration requirement, carbon steel grade, heat treatment requirement, finish, packing method, and inspection documents. Depending on size and quantity, carbon steel flange bolts can be produced by cold heading, hot forging, thread rolling, machining, or combined processes.
Before production
XZ Fastener checks the purchase description, drawing, material requirement, head style, flange diameter, serration form, thread length, finish, and inspection documents. Buyers can browse broader fastener products when the order also includes nuts, washers, anchors, screws, and hex bolts.
During production
Common control points include head height, across-flat dimension, flange diameter, serration quality, thread gauge fit, heat treatment control, coating appearance, and mixed-size prevention.
Custom flange bolts
For special flange diameter, modified serration, non-standard head height, special thread length, or private packing, XZ Fastener can review custom fasteners from drawings, samples, photos, or buyer packing specifications.
تطبيقات
Carbon steel flange bolts are used where a built-in bearing surface, fast assembly, and good load distribution are helpful. Serrated flange types are often chosen where loosening resistance is desired, while non-serrated types are preferred when the mating surface should not be marked.
- Machinery and equipment frames
- Automotive brackets and chassis-related assemblies
- Steel structure accessories
- Electrical cabinets and equipment guards
- Construction hardware and support frames
- Agricultural equipment and trailers
- Maintenance replacement bolt programs
- Distributor stock and OEM assembly lines
For high-vibration, high-load, or safety-sensitive assemblies, confirm bolt grade, mating nut grade, tightening method, surface finish, and inspection requirement before bulk production.
How to Get a Faster Quotation
A clear inquiry helps XZ Fastener quote carbon steel flange bolts accurately. Please provide:
- Size list, such as M6 x 16, M8 x 25, M10 x 30, M12 x 40.
- Standard or drawing, such as DIN 6921, ISO 4162, JIS type, IFI type, or custom flange bolt design.
- Material and strength requirement, such as Class 4.8, 8.8, 10.9, or specified carbon steel grade.
- Flange type, including serrated flange, non-serrated flange, or specified flange diameter.
- Thread requirement, including coarse thread, fine pitch, full thread, partial thread, or exact thread length.
- Finish requirement, such as plain, zinc plated, yellow zinc, black oxide, phosphate, or hot dip galvanized.
- Quantity for each size and expected delivery schedule.
- Packaging requirement, including bulk carton, small box, bag, pallet, label, barcode, or private packing.
- Inspection requirements, such as dimensional report, coating thickness, material certificate, mechanical test report, or third-party inspection.
For a structured inquiry, use the request a quote page or contact XZ Fastener with drawings, photos, or a spreadsheet.
أسئلة متكررة
What is a carbon steel flange bolt?
It is a bolt with a hex head and an integrated flange under the head. The flange provides a larger bearing surface than a standard hex head and can reduce the need for a separate washer in some assemblies.
What standards are commonly used for metric flange bolts?
DIN 6921 and ISO 4162 are common references for metric hex flange bolts. JIS, IFI, and drawing-based flange bolts may use different dimensions, so the purchase order should state the required standard clearly.
Should I choose serrated or non-serrated flange bolts?
Serrated flange bolts can help resist loosening but may mark the mating surface. Non-serrated flange bolts are preferred where the surface finish or coating should not be damaged by serrations.
Can flange bolts replace standard hex bolts?
Not always. Flange bolts have a built-in bearing surface, while DIN 933 full thread hex bolts and metric hex head bolts may require separate washers. The joint design, hole size, mating material, and tightening method should be checked.
Can XZ Fastener supply Grade 8.8 carbon steel flange bolts?
Yes, Class 8.8 carbon steel flange bolts can be supplied according to standard, size, finish, quantity, and inspection requirement. Higher grades can be reviewed by order requirement.
Which finish is suitable for outdoor use?
Hot dip galvanized finish is often selected for heavier outdoor exposure, while zinc plating may be suitable for light outdoor or general hardware use. The expected environment and service life should be confirmed before ordering.
Can custom carbon steel flange bolts be produced from drawings?
Custom flange diameter, serration form, head height, thread length, material grade, finish, marking, and packaging can be reviewed from drawings, samples, photos, quantity, and application details.
Send Your Carbon Steel Flange Bolt Inquiry
Send your size list, finish, quantity, packaging method, and inspection requirements. Include the standard or drawing number, flange type, thread length, material grade, head marking, matching nuts or washers, destination, and any carton or pallet requirements. XZ Fastener will review the details and prepare a quotation according to your order requirement.