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العربية flange bolts and nuts manufacturer
XZ Fastener manufactures and supplies flange bolts and nuts for machinery, automotive, steel structure, construction, solar mounting, and industrial equipment assemblies. Buyers can source hex flange bolts, serrated flange bolts, non-serrated flange bolts, flange nuts, lock flange nuts, and matched bolt-nut-washer sets according to drawings or standard requirements. Materials, grades, thread standards, surface finishes, packaging, and inspection documents can be arranged according to order requirement. For vibration-prone or outdoor assemblies, XZ Fastener helps purchasing teams confirm bolt grade, nut compatibility, flange diameter, coating thickness, and thread fit before production.
Standard flange fasteners and custom flange hardware can be quoted from drawings, samples, or size lists.
Quick Specs
What Buyers Should Know Before Sourcing Flange Bolts and Nuts
Flange bolts and nuts are selected to spread clamp load over a larger bearing surface and reduce the need for a separate washer in many assemblies. Buyers should confirm whether the flange face is serrated or smooth, because serration can improve resistance to loosening but may mark the mating surface. Thread pitch, flange diameter, head size, bearing face, nut height, grade, and finish should be checked together.
For related standard items, buyers can review XZ Fastener fastener products and the hex flange bolt product page before sending final specifications.
Important sourcing checks
- Confirm serrated or non-serrated flange design.
- Match bolt grade with nut grade and tightening method.
- Check flange diameter and bearing surface requirements.
- Confirm coating thickness when thread fit is critical.
- State whether bolts and nuts should be packed together as matched sets.
Common Purchasing Descriptions
Flange fastener inquiries may use different descriptions, including hex flange bolts, serrated flange bolts, flange head bolts, DIN 6921 flange bolts, DIN 6923 flange nuts, flange lock nuts, washer face bolts, frame bolts, automotive flange bolts, and industrial bolt-nut assemblies. Related purchasing lists may also include 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, and hot dip galvanized DIN 933 bolts for the same equipment package.
For flange nut options, buyers can compare the DIN 6923 galvanized serrated hex flange nuts page with the final assembly requirement.
Detailed Specifications Table
| Specification Item | Common Options | Buyer Notes |
|---|---|---|
| Product type | Hex flange bolts, serrated flange bolts, non-serrated flange bolts, flange nuts, flange lock nuts, matched sets | Confirm whether the flange face should bite into the surface or remain smooth. |
| Standard | DIN 6921, DIN 6923, ISO, ANSI, ASME, JIS, GB, custom drawing | Provide the exact standard or drawing because flange diameter and head size can differ. |
| Thread | Metric coarse, metric fine, UNC, UNF, special pitch | Thread pitch must match the nut and the tapped hole when used in equipment assembly. |
| Size range | M3-M36 and inch sizes according to order requirement | Large diameters may require grade, heat treatment, and coating confirmation before production. |
| Material | Carbon steel, alloy steel, stainless steel 304, stainless steel 316, brass, specified material | Material should match load, corrosion exposure, and assembly surface requirements. |
| Grade | 4.8, 5.8, 8.8, 10.9, 12.9, A2-70, A4-70, A4-80, custom requirement | Nut proof strength and bolt grade should be confirmed together for critical assemblies. |
| Surface finish | Plain, zinc plated, yellow zinc, black oxide, hot dip galvanized, Dacromet, Geomet, phosphate | Finish affects corrosion resistance, appearance, thread fit, and assembly friction. |
| Inspection | Dimension, thread gauge, hardness, tensile, proof load, coating thickness, visual check, packing check | Inspection documents can be prepared according to order requirement. |
Material and Grade Explanation
Carbon steel flange bolts and nuts are commonly selected for equipment, brackets, frames, and general industrial assemblies. Grade 8.8 and 10.9 flange bolts can be supplied for higher clamp load requirements when compatible nuts and tightening conditions are specified. Stainless steel 304 and 316 flange fasteners can be considered for corrosion-prone environments where strength class and cost are suitable for the project.
When a flange bolt is used without a separate washer, the bearing face becomes part of the functional design. Buyers can review the bolt, nut, and washer matching guide to avoid common assembly mismatches.
Surface Finish Selection Guide
Zinc Plated
Common for machinery, automotive brackets, electrical cabinets, and general assemblies requiring a clean appearance and moderate corrosion protection.
Yellow Zinc
Often selected for visual identification, replacement hardware, and assemblies where a yellow passivated finish is required by the buyer.
Black Oxide
Suitable for protected machinery and equipment where a dark finish is preferred. Additional oiling can be requested according to order requirement.
Hot Dip Galvanized
Used for outdoor steel structures and heavier corrosion exposure. Thread fit and flange face appearance should be checked due to thicker coating.
Dacromet or Geomet
Zinc flake coatings can be considered where corrosion resistance and controlled coating thickness are important for assembled fasteners.
Phosphate
Used for certain mechanical assemblies, often with oil or post-treatment. Confirm the final corrosion expectation before selecting phosphate only.
For complete assemblies, the guide on surface finish selection for nuts, washers, and bolts can help buyers choose a consistent finish.
Manufacturing and Quality Control
Flange bolt and nut production should control raw material, forming, threading, heat treatment, flange geometry, surface treatment, and final inspection. For flange bolts, head height, wrench size, flange diameter, serration, thread length, and under-head bearing face are important inspection points. For flange nuts, thread fit, nut height, across-flat dimension, flange diameter, and serration should be confirmed.
For quality planning before purchase, buyers can review XZ Fastener’s fastener quality control guide and define inspection requirements before mass production.
Applications
- Automotive brackets, frames, covers, and chassis-related assemblies
- Machinery bases, guards, panels, and support structures
- Solar mounting brackets, clamps, and light steel frames
- Construction hardware, guardrails, and industrial steelwork
- Electrical cabinets, HVAC equipment, and enclosure assembly
- Maintenance replacement kits with flange bolts and flange nuts
- Custom assemblies requiring drawing-based flange dimensions
Custom supply options
For non-standard flange diameter, special serration, shoulder design, unusual thread pitch, or custom marking, XZ Fastener can support custom fasteners according to drawings, samples, or order requirement.
How to Get a Faster Quotation
To quote flange bolts and nuts accurately, send the standard, diameter, length, thread pitch, material, grade, finish, serrated or non-serrated requirement, nut type, quantity, packing method, and inspection requirements. If the part is custom, include a drawing with flange diameter, head height, across-flat size, thread length, tolerance, and surface finish notes.
For fast handling, submit your list through request a quote or contact XZ Fastener with drawings, photos, size list, and packaging requirements.
FAQ
Can XZ Fastener supply flange bolts and nuts as matched sets?
Yes. Flange bolts and flange nuts can be supplied as matched sets according to the required size, grade, finish, thread pitch, and packing method.
What is the difference between serrated and non-serrated flange bolts?
Serrated flange bolts can improve resistance to loosening by biting into the mating surface, while non-serrated flange bolts provide a smoother bearing face. The correct option depends on the assembly surface and tightening requirement.
Which materials are available for flange bolts and nuts?
Carbon steel, alloy steel, stainless steel 304/316, brass, and specified materials can be supplied according to order requirement and application conditions.
Can you produce custom flange bolts from drawings?
Yes. Custom flange bolts can be produced according to drawings or samples. Please provide flange diameter, head dimensions, thread details, material, finish, tolerance, and quantity.
Which finish should be selected for outdoor flange fasteners?
Hot dip galvanized, Dacromet, Geomet, stainless steel, or other corrosion-resistant finishes may be considered depending on exposure, thread fit, coating thickness, and service life expectations.
What inspection items should be requested for flange bolts and nuts?
Common inspection items include dimensions, thread gauge, hardness, tensile strength, proof load, flange diameter, serration check, coating thickness, visual appearance, and packing records.
Send Your Flange Bolt and Nut Inquiry
Send your size list, finish, quantity, packaging, and inspection requirements to XZ Fastener. Drawings, sample photos, material grade, serrated or non-serrated requirement, nut matching details, coating specification, destination country, and delivery schedule will help prepare a faster and more accurate quotation.