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DIN 931 Hex Bolts Supplier
XZ Fastener supplies DIN 931 hex bolts for industrial buyers who need metric partial thread hex head bolts with controlled dimensions, stable thread fit, practical finish options and export-ready packaging. DIN 931 bolts are commonly selected for machinery, steel structure, construction, equipment assembly and maintenance applications where an unthreaded shank section is required for alignment, shear resistance or controlled clamping.
What Buyers Should Know Before Sourcing DIN 931 Hex Bolts
DIN 931 hex bolts are metric hex head bolts with a partial thread design. Unlike fully threaded bolts, a DIN 931 bolt has an unthreaded shank section between the head and the threaded portion. This makes it suitable for assemblies where the smooth shank helps with alignment, shear load handling or a cleaner bearing surface through the joined parts.
When comparing DIN 931 hex bolt suppliers, buyers should confirm more than the unit price. Important checks include the correct standard, diameter, length, thread length, material grade, surface finish, head marking, packaging method and inspection requirement. XZ Fastener also supplies related fastener products for buyers who source bolts, nuts, washers and screws together.
Common Purchasing Descriptions
Buyers may describe this product as DIN 931 partial thread hex bolts, DIN 931 hex head bolts, metric half thread hex bolts, carbon steel DIN 931 bolts, zinc plated DIN 931 bolts, black oxide DIN 931 bolts or hot dip galvanized DIN 931 hex bolts. These terms usually point to the same core requirement: a metric hex head bolt with a controlled unthreaded shank and a finish suitable for the working environment.
DIN 931 Hex Bolt Specifications
Use the table below as a practical sourcing brief for DIN 931 hex bolts. Final production details should be confirmed by standard, drawing, sample or purchase specification before mass production.
| Product Name | DIN 931 Hex Bolts; metric partial thread hex head bolts; half thread hex bolts |
|---|---|
| Estándar | DIN 931; ISO 4014 equivalent requirements can be reviewed according to buyer specification |
| Material | Carbon steel, medium carbon steel, alloy steel, stainless steel A2/A4 or material according to order requirement |
| Strength Class | Common classes include 4.8, 8.8, 10.9 and 12.9; final grade should match the application and engineering requirement |
| Tipo de hilo | Metric partial thread; coarse thread as common supply, fine thread available upon request |
| Common Sizes | M5, M6, M8, M10, M12, M16, M20, M24, M30 and larger sizes by production capability and order quantity |
| Common Lengths | Standard DIN lengths or custom length according to assembly thickness, shank requirement and thread engagement |
| Acabado superficial | Plain, zinc plated, yellow zinc, black oxide, phosphate, hot dip galvanized, Dacromet, Geomet or custom coating |
| Inspection Options | Dimensional inspection, thread gauge, visual check, hardness test, tensile test, coating thickness, salt spray report or material certificate when required |
| Packaging | Bulk carton, small box, woven bag, pallet, wooden case, barcode label or private label packaging for distributors |
Material and Grade Explanation
DIN 931 hex bolts are ordered in different materials and strength classes depending on load, assembly type, corrosion exposure and project specification. XZ Fastener can review grade, finish and inspection requirements before quotation.
Carbon Steel DIN 931 Bolts
Carbon steel is widely used for general industrial fastening and can be supplied with zinc plated, black oxide, phosphate or hot dip galvanized finishes.
High Strength Grades
Grade 8.8, 10.9 and 12.9 DIN 931 bolts are commonly requested for machinery, steel structure and equipment assemblies requiring stronger fastening performance.
Stainless Steel Options
Stainless steel DIN 931 bolts may be selected for corrosion resistance in marine, chemical, food equipment or outdoor environments. A2 and A4 grades can be reviewed by application.
Partial Thread Design: Why It Matters
The main feature of DIN 931 hex bolts is the partial thread structure. The unthreaded shank can help reduce thread contact inside the shear plane and improve alignment through the joined components. This is one reason buyers often choose DIN 931 bolts for machinery frames, steel connections, brackets, mounting plates and equipment assemblies.
If the assembly requires thread along the full length, buyers may consider DIN 933 instead. XZ Fastener supplies both DIN 931 zinc plated carbon steel hex head bolts and related full thread hex bolt options for different fastening requirements.
Common Matching Parts
DIN 931 hex bolts are often ordered together with nuts and washers. Confirming the nut grade, washer type and coating compatibility helps reduce assembly issues during installation.
- Metric hex nuts for standard bolt and nut assemblies.
- Flat washers for load distribution and surface protection.
- Spring washers or lock washers where anti-loosening support is required.
- Matching coating on bolts, nuts and washers to reduce corrosion mismatch.
- Project packaging by size set when field installation needs faster identification.
Surface Finish Selection Guide
Surface finish affects corrosion resistance, appearance, thread fit, storage condition and total cost. The best finish depends on whether the bolts are used indoors, outdoors, near chemicals, in coastal environments or in heavy equipment.
| Zinc Plated | Common economical finish for indoor or mild environments. Available in white zinc, blue zinc or yellow zinc depending on buyer preference. |
|---|---|
| Black Oxide | Often selected for darker appearance and light protection. Suitable where visual consistency and controlled storage conditions are important. |
| Hot Dip Galvanized | Preferred for outdoor and higher corrosion exposure. Buyers should confirm thread fit, nut compatibility and coating thickness requirements. |
| Phosphate and Oil | Used where temporary rust prevention, darker surface appearance or assembly lubrication is required. |
| Dacromet or Geomet | Suitable for specific anti-corrosion requirements when project approval or controlled coating performance is required. |
For further selection support, buyers can review XZ Fastener’s guide on zinc, HDG, stainless steel and Dacromet corrosion resistance.
Manufacturing and Quality Control
A reliable DIN 931 hex bolts supplier should control material, dimensions, thread quality, mechanical properties, surface finish and packaging. Small deviations can cause installation delays, thread mismatch, coating damage or failed incoming inspection.
Manufacturing Control Points
- Material selection according to grade, strength and application requirement.
- Cold heading control for head shape, bearing surface and dimensional stability.
- Thread rolling control for pitch accuracy, thread profile and nut compatibility.
- Heat treatment review for high strength grades such as 8.8, 10.9 and 12.9.
- Surface treatment selection based on corrosion exposure and assembly method.
Inspection Documents Buyers May Request
- Dimensional inspection report for diameter, length, shank length and thread length.
- Material certificate or heat number traceability where applicable.
- Hardness or tensile test report for high strength bolt grades.
- Coating thickness report for zinc plated or galvanized bolts.
- Salt spray test report when corrosion resistance is specified.
Buyers who need deeper inspection planning can also read XZ Fastener’s guide to bolt test certificates, grade, material and traceability requirements.
Applications for DIN 931 Hex Bolts
DIN 931 hex bolts are used in industrial assemblies where a metric partial thread bolt is preferred. The correct grade, finish and matching nut or washer should always be confirmed against the load, environment and installation method.
Machinery Assembly
Used in frames, bases, guards, brackets, mounting plates and replaceable machine components.
Steel Structure
Suitable for support frames, platforms, secondary connections and fabricated steel components.
Construction Projects
Applied in installation, repair, maintenance and project procurement where standard metric bolts are required.
Heavy Equipment
Used for equipment frames and structural accessories requiring controlled shank and thread engagement.
Pipe and Bracket Support
Suitable for brackets, support systems, clamps and installation hardware where strength and coating matter.
Distributor Inventory
Common DIN sizes can be packed for wholesalers, importers and fastener distributors requiring repeat orders.
Related DIN 931 and Hex Bolt Options
Different projects may require different grades, finishes and materials. XZ Fastener can help buyers compare DIN 931 hex bolts with other metric hex bolt options before ordering.
DIN 931 ISO 4014 Bolts
For high strength half thread requirements, review DIN 931 ISO 4014 metric half thread hex head bolts.
Stainless Steel Hex Bolts
For corrosion resistance, buyers can compare stainless steel DIN 931 ISO 4014 hex head bolts.
Custom Fastener Service
If your order requires non-standard length, marking, coating or packaging, check XZ Fastener’s customized service.
How to Get a Faster and More Accurate Quotation
A clear RFQ helps avoid repeated confirmation and improves quotation accuracy. Instead of asking only for a DIN 931 hex bolt price, include the technical and purchasing information below.
Confirm standard, size and length
State DIN 931, diameter, total length and whether the shank length or thread length must meet a drawing or project requirement.
Define material and strength class
Confirm carbon steel, alloy steel or stainless steel, and specify the grade such as 4.8, 8.8, 10.9 or 12.9.
Select the surface finish
Choose plain, zinc plated, black oxide, hot dip galvanized, phosphate, Dacromet or another coating according to the environment.
Provide quantity and packaging
Share order quantity, carton weight limit, small box requirement, pallet size, label style and destination port or delivery term.
FAQ: DIN 931 Hex Bolts
What is a DIN 931 hex bolt?
A DIN 931 hex bolt is a metric hex head bolt with a partial thread. It has an unthreaded shank section and is commonly used in machinery, steel structures and construction assemblies.
What is the difference between DIN 931 and DIN 933?
DIN 931 bolts are partially threaded, while DIN 933 bolts are fully threaded. DIN 931 is often selected when a smooth shank section is needed for alignment, shear area or controlled clamping.
Can DIN 931 bolts be supplied in Grade 8.8 or Grade 10.9?
Yes. DIN 931 hex bolts can be supplied in different strength classes such as 4.8, 8.8, 10.9 and 12.9 according to the application and order requirement.
Which finish is suitable for outdoor DIN 931 hex bolts?
Hot dip galvanized, Dacromet, Geomet or stainless steel options are commonly considered for outdoor or higher corrosion environments. The final finish should match the exposure condition and project standard.
What information should I send for a DIN 931 bolt quotation?
Send the standard, diameter, length, grade, material, surface finish, quantity, packaging, destination and any drawing or inspection requirement.
Can XZ Fastener supply nuts and washers with DIN 931 bolts?
Yes. Matching nuts, flat washers, spring washers and other related fasteners can be reviewed together so the coating, grade and packaging are suitable for the assembly.
Source DIN 931 Hex Bolts from XZ Fastener
Send your size list, finish, quantity, packaging and inspection requirements for a practical manufacturer quotation.