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العربية DIN 931 hex cap screws bulk order manufacturer
XZ Fastener manufactures DIN 931 hex cap screws for bulk orders used by distributors, OEM production lines, steel fabricators, construction suppliers, and industrial maintenance programs. DIN 931 is a partial-thread metric hex fastener, so bulk purchasing must control more than overall length. Buyers should confirm thread length, shank diameter, grade, finish, head marking, nut engagement, packing quantity, and document wording before production. Carbon steel, alloy steel, and stainless steel options can be supplied according to order requirement, with inspection focused on repeatable dimensions and batch consistency.
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Quick Specs
| Estándar | DIN 931 metric hex head screws and partial-thread hex bolts |
|---|---|
| Fuerza | Common property classes include 4.8, 5.8, 8.8, 10.9, and 12.9; stainless A2-70 and A4-70 can be supplied according to order requirement |
| Material | Carbon steel, medium carbon steel, alloy steel, stainless steel 304/A2, stainless steel 316/A4 |
| Finish | Plain, zinc plated, black oxide, hot dip galvanized, zinc flake, nickel plated, passivated stainless steel |
| Aplicación | Machinery frames, steel structures, brackets, equipment assembly, construction hardware, distributor stock, maintenance kits, and general fastening |
Bulk buyers can compare DIN 931 hex cap screws with other standard fasteners before confirming mixed bolt, nut, washer, and threaded rod requirements.
What Buyers Should Know Before Sourcing DIN 931 Hex Cap Screws
Partial Thread Controls the Application
DIN 931 is selected when the unthreaded shank matters. It may improve alignment, pass through a shear plane, or keep threads away from a loaded hole. That makes thread length and shank length key purchasing details, not optional notes.
If the application needs full thread, DIN 933 may be the better choice. XZ Fastener can help compare related industrial bolts before bulk production starts.
Bulk Orders Need Batch Discipline
A sample can look correct while a bulk batch still creates receiving problems. Buyers should confirm head marking, thread length, coating thickness, carton quantity, pallet weight, and label format before production.
For complete bolted joints, review matching industrial nuts and flat washers early so each assembly part matches the required grade and finish.
Common Purchasing Descriptions
Clear descriptions help the manufacturer quote, produce, inspect, pack, and label the correct goods. Use separate line items for each size, grade, material, finish, and thread requirement.
| Purchasing Description | Typical Use | Buyer Note |
|---|---|---|
| DIN 931 hex cap screws, M12 x 80 mm, Class 8.8, zinc plated | Steel brackets and machinery frames | Confirm partial thread length and nut engagement |
| DIN 931 partial thread hex bolts, M16 x 100 mm, Class 10.9, plain finish | Higher-strength mechanical assemblies | Confirm material certificate and heat treatment control |
| Metric hex head bolts, DIN 931, M20 x 120 mm, hot dip galvanized | Outdoor steelwork and exposed construction hardware | Confirm matching nut fit after galvanizing |
| DIN 931 stainless steel hex cap screws, M10 x 70 mm, A4-70, passivated | Coastal, wet, or corrosion-prone assemblies | State A2 or A4 clearly on purchase documents |
| DIN 933 full thread hex bolts, Grade 8.8 carbon steel hex bolts, metric hex head bolts | Related full-thread bolt stock | Use DIN 933 when full thread is required |
| Zinc plated DIN 933 bolts, black oxide DIN 933 bolts, hot dip galvanized DIN 933 bolts | Matching coated bolt inventory | Keep finish wording consistent across all order lines |
When product wording differs between markets, buyers can review the DIN and ISO fastener standards guide before confirming final purchasing descriptions.
Detailed Specifications Table
| Specification Item | Common Options | Bulk Order Checkpoint |
|---|---|---|
| Estándar | DIN 931 | Confirm partial-thread hex head fastener requirement |
| Diámetro | M3 to M64 commonly requested; other sizes available upon request | Confirm diameter and thread pitch for each line item |
| Longitud | Common metric lengths according to order requirement | Measure length from under the head to the bolt end |
| Thread | Metric coarse thread; metric fine thread available upon request | Confirm thread length, shank length, and gauge inspection requirement |
| Fuerza | 4.8, 5.8, 8.8, 10.9, 12.9, A2-70, A4-70 | Match grade with material, heat treatment, head marking, and certificate |
| Head Style | Hexagon head | Confirm across-flat dimension, head height, and marking requirement |
| Finish | Plain, zinc plated, black oxide, hot dip galvanized, zinc flake, nickel plated, passivated | Confirm coating thickness, appearance, and post-finish nut fit |
| Packing | Cartons, bags, small boxes, pallets, or customer-labeled packing | Separate by size, grade, finish, batch, and customer item code |
| Documents | Commercial invoice, packing list, material certificate, inspection report when required | Keep product descriptions consistent with PO, labels, and certificates |
Material and Grade Explanation
Carbon Steel and Alloy Steel
Class 4.8 and 5.8 DIN 931 hex cap screws are common for light-duty hardware and general assemblies. Class 8.8 bolts are widely used in steel fabrication, equipment frames, brackets, and construction hardware where reliable mechanical performance is required.
Class 10.9 and 12.9 fasteners need closer control of material, heat treatment, hardness, and plating risk. Buyers can compare related high-strength fasteners before confirming grade and finish.
Stainless Steel Options
A2 stainless steel is suitable for clean indoor and general corrosion-resistant applications. A4 stainless steel is preferred for coastal exposure, wet environments, and more aggressive corrosion conditions.
For stainless DIN 931 hex cap screws, buyers should confirm whether A2-70, A4-70, or another stainless class is required. Packing should prevent surface contamination and mixed-material handling damage.
Surface Finish Selection Guide
Finish selection affects corrosion resistance, appearance, thread fit, storage life, and installation behavior. The finish name should match the quotation, purchase order, packing list, label, and inspection report.
| Finish | Typical Use | Bulk Order Comment |
|---|---|---|
| Plain | Indoor fabrication, oil-protected stock, or parts for later coating | Needs rust protection for storage and sea freight |
| Zinc Plated | General hardware, equipment assembly, distributor stock | Common choice for clean appearance and moderate protection |
| Black Oxide | Machinery and indoor assemblies requiring dark appearance | Often requires oiling for better storage protection |
| Hot Dip Galvanized | Outdoor structures and exposed construction hardware | Confirm matching nut tolerance after galvanizing |
| Zinc Flake | Higher corrosion resistance with controlled coating build | Available upon request for defined project requirements |
| Passivated Stainless | Stainless steel bolts for clean or corrosive environments | Pack carefully to avoid surface contamination |
For finish comparison across product lines, buyers can review XZ Fastener’s coated fasteners before finalizing the bulk order.
Manufacturing and Quality Control
DIN 931 hex cap screws are typically produced through wire preparation, cold heading or hot forging depending on size, thread rolling or machining, heat treatment when required, surface finishing, inspection, and packing. Bulk production should focus on repeatability, batch traceability, and practical receiving control.
- Confirm material grade, wire rod source, and heat number when traceability is required.
- Check head dimensions, across-flat size, length, shank diameter, and thread pitch.
- Confirm partial-thread length and functional thread fit with gauges or matching nuts.
- Inspect mechanical properties, hardness, and head marking for high-strength grades.
- Review coating thickness, appearance, corrosion protection, and post-coating assembly fit.
- Separate packing by size, grade, finish, batch, and customer item code.
- Verify carton labels, pallet marks, inspection reports, packing list, and shipment documents before delivery.
Aplicaciones
Machinery and Steel Fabrication
DIN 931 hex cap screws are used in machinery frames, brackets, structural connections, equipment bases, and support plates. The unthreaded shank can help with alignment and may keep threads away from critical shear areas.
Distributor and Construction Supply
Bulk buyers use DIN 931 bolts for steelwork, support hardware, pipe brackets, maintenance stock, and general fastening. They are often combined with nuts, washers, and other fastener products for complete stock programs.
How to Get a Faster Quotation
A complete inquiry helps the manufacturer quote the correct DIN 931 fastener, plan production, prepare packing details, and avoid repeated clarification.
- Standard: DIN 931 or drawing requirement if modified.
- Size: diameter, pitch, and length, such as M16 x 100 mm.
- Thread requirement: standard partial thread, special thread length, or drawing-based thread length.
- Grade and material: 4.8, 8.8, 10.9, 12.9, A2-70, A4-70, or specified material.
- Finish: plain, zinc plated, black oxide, hot dip galvanized, zinc flake, nickel plated, or passivated.
- Quantity: pieces, cartons, pallets, or container quantity.
- Packing: carton quantity, small box packing, pallet marking, bar code label, or customer label.
- Inspection: material certificate, mechanical test, coating report, gauge check, or third-party inspection if required.
- Bulk order details: mixed sizes, repeat order schedule, carton label format, and warehouse receiving requirement.
Preguntas frecuentes
What are DIN 931 hex cap screws?
DIN 931 hex cap screws are metric hex head fasteners with partial thread and an unthreaded shank. They are commonly used where alignment, clamping length, or shear area matters.
What is the difference between DIN 931 and DIN 933?
DIN 931 normally refers to partial-thread hex head fasteners, while DIN 933 refers to full-thread hex head fasteners. Buyers should confirm which thread style the assembly requires.
Which grades are commonly supplied for bulk orders?
Common grades include 4.8, 5.8, 8.8, 10.9, and 12.9 for carbon or alloy steel. Stainless steel A2-70 and A4-70 can be supplied for corrosion-resistant applications.
Can DIN 931 bolts be hot dip galvanized?
Yes. Hot dip galvanized DIN 931 bolts can be supplied for outdoor and exposed applications. Buyers should confirm coating thickness and matching nut fit after galvanizing.
Can XZ Fastener supply matching nuts and washers?
Yes. Nuts and washers can be quoted as separate line items or packed according to order requirement. Buyers should define nut grade, washer type, finish, and packing method clearly.
What should buyers confirm before bulk production?
Buyers should confirm standard, size list, grade, material, finish, quantity, packaging method, inspection requirements, thread length, head marking, label format, and document requirements before bulk production starts.
Send Your Bulk DIN 931 Hex Cap Screw Requirement
For a faster and more accurate quotation, send your size list, finish, quantity, packaging method, and inspection requirements. Include grade, material, thread pitch, thread length, certificate needs, head marking requirements, carton label format, and whether matching nuts or washers are required.
Contact XZ Fastener