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The DIN 934 specification is the global benchmark for standard metric hex nuts. Essential for industrial assembly, agricultural machinery, structure engineering, and automotive drivetrains, DIN 934 specifies thread profiles, dimensional parameters, tolerances, and proof loads to guarantee connection security. At Sinsun Hardware, we engineer these vital components to withstand extreme torque thresholds and harsh operating environments.
Note on Standard Coexistence: While DIN 934 remains highly requested across European and Asian supply chains, standard updates like ISO 4032 feature slightly modified widths across flats (s) for sizes M10, M12, M14, and M22. Sinsun's tooling lines support both profiles to prevent assembly integration issues.
Our facility manufactures DIN 934 hex nuts in coarse and fine threads spanning M2 up to M64. Symmetrical chamfers, thread lead-ins, and consistent pitch profiles prevent cross-threading and galling during automated assembly line feeding.
| Metric Size (d) | Thread Pitch (Coarse) | Width Across Flats (s) | Nut Height (m) | Width Across Corners (e) |
|---|---|---|---|---|
| M6 | 1.00 mm | 10.00 mm | 5.00 mm | 11.05 mm |
| M8 | 1.25 mm | 13.00 mm | 6.50 mm | 14.38 mm |
| M10 | 1.50 mm | 17.00 mm | 8.00 mm | 18.90 mm |
| M12 | 1.75 mm | 19.00 mm | 10.00 mm | 21.10 mm |
| M16 | 2.00 mm | 24.00 mm | 13.00 mm | 26.75 mm |
| M20 | 2.50 mm | 30.00 mm | 16.00 mm | 32.95 mm |
We supply DIN 934 nuts in Property Classes 5, 6, 8, 10, and 12, depending on the application load profile. Each grade uses specific raw alloy chemistry paired with precise induction heat treatment to meet targeted tensile loads.
Control from raw material to finished product ensures quality and on-time shipment.
Our quality control starts at the source. Sinsun begins processing using premium steel from XING TAI Steel and Ansteel Group (utilizing 10,000+ tons of carbon steels annually). In-house spheroidizing annealing and wire drawing ensure optimal microstructure consistency for high-precision cold heading.
Sinsun operates over 200 German-imported multi-station cold heading machines and Taiwanese production setups, achieving throughputs up to 1,200 pieces per minute. This allows tight tolerances (±0.02mm) and a highly polished finish (Ra ≤ 0.4μm) across our 20,000+ SKU inventory.
We run four fully automated, atmosphere-controlled gas furnaces with a daily hardening capacity of 20 tons. Proper hardening and tempering cycles eliminate internal stress, bringing fastener strength thresholds above 1,000 MPa and stabilizing hardness at HRC 28-32 for structural applications.
Sinsun's 12,000 sqm smart warehouse holds over 18,000 pallets. Connected to our custom ERP tracking system, our warehouse processes over 3,000 cartons per hour, enabling seamless shipment of 8,500+ containers annually to markets in South America, the Middle East, Southeast Asia, and Russia.
Delivering certified security, precision performance, and tailored support across major industrial fields.
We supply tier-1 automotive suppliers with specialized, high-vibration resistant hex fasteners. Tight tolerance matching avoids bolt relaxation, maintaining joint clamp loads under extreme thermo-mechanical stress cycles.
In offshore structures, sea spray and mechanical strain require premium corrosion resistance. Sinsun provides duplex stainless steel and specialized hot-dip galvanized or Dacromet-coated fasteners designed to exceed 1,000-hour salt spray testing.
From stadium framing to massive distribution hubs, structural joints rely on heavy duty DIN 934 hex nuts to secure framework connections. Our fasteners ensure high torque-to-tension efficiency, lowering installation risks.
Our structured workflow ensures quality control and on-time shipping for custom and wholesale orders.
We analyze your application challenges, metallurgical limits, and thread requirements to match your needs.
Our engineers provide detailed CAD models, material options, and surface coating recommendations.
We supply pre-production samples for physical verification, torque testing, and approval before mass production.
Our 200+ cold heading machines process the order under 12+ strict quality checkpoints.
We pack and ship items via our ERP-managed system, offering custom container optimization.
See how we solve engineering and supply-chain challenges for industrial clients.
Challenge: A tier-1 automotive supplier required custom flange fasteners with high vibration resistance and weight limits.
Sinsun Solution: We redesigned the components using a high-tensile alloy and a specialized locking thread pattern.
Result: Achieved a 15% component weight reduction, passed a 2,000-hour vibration test, and optimized assembly performance.
Challenge: Marine builders needed large-diameter bolts and nuts to withstand corrosive saltwater environments.
Sinsun Solution: Sinsun supplied duplex stainless steel hardware with specialized surface passivation.
Result: Zero assembly failures reported in corrosive environments, meeting the client's design life requirements.
How Sinsun is adapting to next-generation environmental and engineering specifications.
To support global environmental directives (RoHS and REACH), we are expanding chromium-free coating solutions. These coatings provide over 1,000 hours of salt spray protection without environmental hazards.
As EV and aerospace designs prioritize light weight, we are developing processes for high-strength aluminum, titanium, and magnesium alloy fasteners to maintain joint integrity at reduced weight.
Sinsun is integrating unique batch tracking and smart marking options onto fastener heads. This aids automated assembly scanning and maintains full material traceability throughout the service life.
Take a visual tour through our production facility, showcasing raw wire processing, modern cold forging, heat treatment lines, and automated packaging hubs.
Answers to common inquiries regarding standard specifications, materials, ordering, and delivery.
While they are largely interchangeable, ISO 4032 features slightly taller heights (m) and altered widths across flats (s) for M10, M12, M14, and M22 sizes compared to DIN 934. Sinsun produces both standards to ensure compatibility.
Lead times depend on part geometry, size, coatings, and volume. For standard fasteners, production takes 4-6 weeks. Sinsun provides a firm delivery schedule with each quotation.
Yes. Sinsun offers full OEM and ODM services, including customized boxes, packaging styles, 3D design previews, and shipping labels for your inventory management needs.
We maintain full traceability by sourcing raw materials from Ansteel and Xingtai Steel. Each batch is accompanied by material test reports (MTR) and physical test certificates upon request.
We offer flexible purchasing options. We optimize for high-volume wholesale production but can accommodate smaller trial runs for prototype evaluation. Please contact our team with your specifications.
Heavy-duty bolts, specialized construction screws, and structural anchoring products.
Your projects require a fastener supplier who understands quality control. Sinsun provides solutions for distributors, OEMs, and industrial projects worldwide.
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