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Русский DIN 7991 countersunk socket head screws exporter
XZ Fastener supplies DIN 7991 countersunk socket head screws for export orders where buyers need a flush head, internal hex drive, and stable metric thread quality. These flat head socket screws can be supplied in alloy steel, carbon steel, stainless steel 304, and stainless steel 316, with black oxide, zinc plated, nickel plated, phosphate, Dacromet, Geomet, or passivated finish according to order requirement. For consolidated shipments, buyers can combine countersunk screws with related fastener products such as nuts, washers, threaded rods, and hex bolts.
Export support can include packing photos, carton labels, pallet plans, inspection records, and shipment document coordination.
Quick Specs
What Buyers Should Know Before Sourcing DIN 7991 Countersunk Socket Head Screws
Confirm Flush Seating Details
DIN 7991 countersunk socket head screws are used where the fastener head must sit level with the assembly surface. Buyers should confirm countersink angle, head diameter, head height, socket size, thread pitch, and length measurement method before placing an export order.
For OEM equipment and machined parts, a drawing is helpful because countersunk seating depends on both the screw head geometry and the prepared hole in the mating component.
Prepare Export Packing Requirements
Export orders need clear packing rules, not only screw dimensions. Confirm carton weight limit, inner box quantity, bag packing, label language, barcode requirement, pallet size, and shipping mark before quotation.
For distributors and importers, the guide on sourcing fasteners from China for distributors explains practical stock, packaging, and quality points for repeated shipments.
Common Purchasing Descriptions
DIN 7991 countersunk socket head screws are often described in different ways across purchasing lists. Clear wording helps avoid incorrect head style, drive type, or length interpretation.
- DIN 7991 countersunk socket head screws, alloy steel 10.9 or 12.9, black oxide finish, metric coarse thread.
- DIN 7991 flat head socket screws, stainless steel 304 or 316, plain or passivated finish, export carton packing.
- Hex socket countersunk head screws, M3 to M16, zinc plated or nickel plated, customer label available upon request.
- DIN 7991 countersunk screws ordered together with DIN 933 full thread hex bolts for machinery assembly kits.
- Grade 8.8 carbon steel hex bolts, metric hex head bolts, and countersunk socket screws for equipment manufacturing.
- Zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts supplied with nuts and washers for consolidated export shipments.
Detailed Specifications Table
| Specification Item | الخيارات المتاحة | Export Buyer Notes |
|---|---|---|
| نوع المنتج | DIN 7991 countersunk socket head screws, flat head socket screws, hex socket countersunk screws | Confirm DIN 7991 or ISO 10642 reference if the drawing specifies a particular head profile. |
| نطاق الحجم | Common sizes include M3, M4, M5, M6, M8, M10, M12, M16; other sizes can be discussed | Send diameter x length and clarify whether length is measured from the top of the head. |
| Thread | Metric coarse thread; metric fine thread available upon request | Thread pitch and tolerance should match the tapped hole, nut, or assembly drawing. |
| Head and Drive | Countersunk flat head with internal hex socket | Head angle, socket fit, and seating depth should be checked for flush assemblies. |
| مادة | Alloy steel, carbon steel, stainless steel 304, stainless steel 316 | Material should be selected according to strength, corrosion exposure, appearance, and cost target. |
| Strength Grade | 8.8, 10.9, 12.9, A2-70, A4-70, A4-80 | High-strength alloy steel grades should be matched with tightening method and assembly design. |
| إنهاء السطح | Black oxide, zinc plated, yellow zinc, nickel plated, phosphate, Dacromet, Geomet, plain stainless, passivation | Coating thickness can affect thread fit and head seating; sample approval can be arranged when required. |
| Packaging | Bulk carton, small box, plastic bag, customer label, barcode label, pallet packing | Carton size, gross weight, shipping mark, and pallet loading should be confirmed before production packing. |
| Inspection | Dimension check, thread gauge check, socket size check, head seating check, surface inspection, hardness test | Inspection report and packing photos can be supplied according to order requirement. |
| Export Documents | Commercial invoice, packing list, bill of lading, certificate of origin when required | Document requirements should be discussed before shipment arrangement. |
Material and Grade Explanation
Alloy steel DIN 7991 screws are commonly requested in grades 10.9 and 12.9 for machinery, tooling, fixtures, molds, and compact assemblies that require stronger clamping performance with a flush head.
Carbon steel options can be supplied for general industrial applications where cost control and coating protection are important. Buyers should confirm whether black oxide, zinc plating, phosphate, or another finish is required.
Stainless steel 304 and 316 are selected when corrosion resistance and clean appearance are important. Stainless 316 is preferred for humid, outdoor, marine-related, or chemical environments.
For broader screw selection, the industry guide to screw selection can help buyers compare countersunk socket screws with pan head, button head, self-tapping, and machine screw options.
Surface Finish Selection Guide
Black Oxide
Common for alloy steel countersunk socket screws used in indoor machinery, fixtures, molds, and tooling. Oiling may be requested for storage protection.
Zinc Plated
Suitable for general export stock where bright appearance and moderate corrosion protection are required.
Nickel Plated
Often selected for appearance-sensitive assemblies or buyer-specific surface requirements.
Phosphate
Used where darker appearance, oil retention, or controlled friction is required in mechanical assemblies.
Dacromet and Geomet
Available upon request for higher corrosion resistance needs, especially where traditional electroplating is not preferred.
Coating Comparison
Buyers can compare finish options in the fastener coating guide before confirming the final specification.
Manufacturing and Quality Control
DIN 7991 countersunk socket head screws are typically produced through wire preparation, cold heading or forming, socket forming, thread rolling, heat treatment when required, surface finishing, sorting, and packing. Countersunk head forming must be controlled because the head angle and head diameter affect flush seating.
Inspection may include head diameter, head height, countersink profile, socket size, overall length, thread length, thread pitch, thread fit, surface condition, and hardness for heat-treated steel parts. The thread inspection methods guide explains practical thread checks buyers can request before shipment.
For export shipments, XZ Fastener can prepare packing photos, carton labels, inspection records, and shipment document support according to order requirement.
تطبيقات
Industrial Assemblies
- Machine guards, panels, covers, brackets, access plates, and equipment housings.
- Automation fixtures, tooling plates, mold components, and CNC-related assemblies.
- Furniture connectors, display hardware, metal frames, and flush surface structures.
- Electrical enclosures, guide rails, compact machinery parts, and OEM equipment.
Export Purchasing Programs
- Distributor stock orders with mixed M3 to M16 countersunk socket screw sizes.
- OEM production batches with controlled material, grade, finish, and packing format.
- Combined container orders with socket screws, machine screws, hex bolts, nuts, and washers.
- Private-label cartons, barcode labels, and palletized export packing available upon request.
How to Get a Faster Quotation
Send diameter, length, thread pitch, material, strength grade, finish, quantity, packaging method, inspection requirements, destination port, and document requirements. If the screw must sit perfectly flush, include the assembly drawing, countersink angle, countersink diameter, and any special head tolerance requirement.
For export orders, packaging and documents are part of the purchasing plan. Buyers can review fastener shipping documents and the container loading guide before confirming carton weight, pallet dimensions, and shipment marks.
أسئلة متكررة
Can XZ Fastener supply DIN 7991 countersunk socket head screws for export orders?
Yes. DIN 7991 countersunk socket head screws can be supplied for export orders, distributor stock, OEM projects, and equipment manufacturing. Buyers should provide size, material, grade, finish, quantity, packaging, and inspection requirements.
What is the difference between DIN 7991 and DIN 912 screws?
DIN 7991 screws have a countersunk flat head designed to sit flush with the surface. DIN 912 screws have a cylindrical socket head. The correct choice depends on head clearance, appearance, seating surface, and assembly design.
Which materials are available for DIN 7991 countersunk socket screws?
Common materials include alloy steel, carbon steel, stainless steel 304, and stainless steel 316. Other materials may be discussed when drawings, samples, and application requirements are provided.
Can export cartons include buyer labels and barcodes?
Yes. Bulk cartons, small boxes, plastic bags, buyer labels, barcode labels, shipping marks, and pallet labels can be arranged according to order requirement. Label content should be confirmed before packing.
What finishes can be supplied for DIN 7991 countersunk screws?
Finish options may include black oxide, zinc plated, yellow zinc, nickel plated, phosphate, Dacromet, Geomet, plain stainless, and passivated stainless. The suitable finish depends on material, application environment, appearance, and thread fit.
What documents are usually needed for export shipments?
Common export documents may include commercial invoice, packing list, bill of lading, and certificate of origin when required. Inspection reports and packing photos can also be supplied according to order requirement.
Send Your DIN 7991 Countersunk Socket Screw Export Inquiry
Send your size list, finish, quantity, packaging method, carton or pallet requirement, inspection requirements, destination port, and shipment document needs. XZ Fastener can review DIN 7991 countersunk socket head screws and related fasteners for export quotation.
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