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DIN 931 hex cap screws factory

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DIN 931 hex cap screws factory

XZ Fastener manufactures DIN 931 hex cap screws for distributors, OEM buyers, equipment builders, steel fabricators, and construction supply programs that require metric partial-thread hex fasteners. DIN 931 is often selected when the unthreaded shank supports alignment, shear area, or controlled clamping length. Factory confirmation should cover diameter, pitch, length, thread length, material grade, finish, nut fit, and packing before production. Carbon steel, alloy steel, and stainless steel options can be supplied according to order requirement, with inspection focused on head dimensions, shank diameter, thread fit, mechanical properties, coating quality, and shipment labeling.

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DIN 931 hex cap screws factory product illustration

Quick Specs

قياسي DIN 931 metric hex head screws and partial-thread hex bolts
Strength 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
مادة 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
تطبيق Machinery frames, steel structures, brackets, equipment assembly, construction hardware, maintenance stock, and general fastening

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

DIN 931 Means Partial Thread

DIN 931 is commonly used for metric hex head fasteners with a partial thread and an unthreaded shank. Buyers choose this design when the shank needs to pass through a shear plane, improve alignment, or avoid having threads inside a loaded hole.

If the project requires full thread, DIN 933 may be the correct alternative. XZ Fastener can help compare related industrial bolts before factory production starts.

Thread Length Must Be Checked

The most common mistake is ordering by diameter and overall length only. For DIN 931, the thread length and shank length are part of the working design. If the nut cannot fully engage, or if threads sit in the shear zone, the joint may not perform as expected.

For complete assemblies, review matching industrial nuts and flat washers early so the bolt set is specified correctly.

Common Purchasing Descriptions

Clear descriptions help the factory quote, produce, inspect, 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 the order

When product wording differs between markets, buyers can review the DIN and ISO fastener standards guide before confirming the final purchasing description.

Detailed Specifications Table

Specification Item Common Options Factory Order Checkpoint
قياسي DIN 931 Confirm partial-thread hex head fastener requirement
قطر M3 to M64 commonly requested; other sizes available upon request Confirm diameter and thread pitch for each line item
Length 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
Strength 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

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 Procurement 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 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. Factory control should be planned before mass production starts.

  1. Confirm material grade, wire rod source, and heat number when traceability is required.
  2. Check head dimensions, across-flat size, length, shank diameter, and thread pitch.
  3. Confirm partial-thread length and functional thread fit with gauges or matching nuts.
  4. Inspect mechanical properties, hardness, and head marking for high-strength grades.
  5. Review coating thickness, appearance, corrosion protection, and post-coating assembly fit.
  6. Separate packing by size, grade, finish, batch, and customer item code.
  7. Verify carton labels, pallet marks, inspection reports, and shipment documents before delivery.

For non-standard lengths, special thread length, head marking, mixed packing, or project-specific labels, XZ Fastener can discuss the required customized service before production.

تطبيقات

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.

Construction and Industrial Supply

Distributors and contractors use DIN 931 bolts for steelwork, support hardware, pipe brackets, and general fastening. Buyers often combine them with nuts, washers, and other fastener products for complete supply packages.

How to Get a Faster Quotation

A complete inquiry helps the factory quote the correct DIN 931 fastener without repeated clarification. Send the information in a clean size list when possible.

  • 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.

أسئلة متكررة

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?

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 send for a factory quotation?

Buyers should send standard, size list, grade, material, finish, quantity, packaging method, inspection requirements, thread length requirements, and any head marking or document requirements.

Send Your 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, and whether matching nuts or washers are required.

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