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Better Fastener Industry Co., Ltd. is a Hexagon Head Bolts manufacturer supplying standard and drawing-based hex bolts from our own bolt workshops in Zhejiang, China. The range covers metric and inch series, full-thread and partial-thread configurations, carbon steel and stainless steel, with strength grades from 4.8 to 12.9.
These bolts are the default structural fastener for steel frames, machinery assemblies, rail equipment, automotive chassis, construction machinery and general industrial fabrication. We produce to DIN, ISO, ASME, JIS and GOST dimensional systems, and we build each order around the joint design, working environment and assembly method rather than a catalogue number alone.
Our Hexagon Head Bolt Range
Our bolt workshops run standard hex head production alongside custom runs, so a single purchase order can combine several head forms, thread types and finishes. The table below shows the main hex head families we quote and where each one is normally applied.
| Product Family | Typical Standard | Configuration | Application Fit |
|---|---|---|---|
| Partial-thread hex bolt | DIN 931, ISO 4014 | Grade 4.8–12.9, plain or coated | Structural steel, machine frames, long grip lengths |
| Full-thread hex bolt | DIN 933, ISO 4017 | Grade A/B, stainless A2/A4 | Clamped stacks, adjustment range, general assembly |
| Heavy hex structural bolt | DIN 6914 | High-strength, blackened or HDG | Bridges, towers, heavy steel connections |
| Fine-thread hex bolt | DIN 960 | Fine pitch, controlled preload | Machine tools, vibration-loaded joints |
| Fitted / reduced shank bolt | DIN 609, DIN 7964 | Ground shank, long thread | Shear joints, pivot points, reamed holes |
| Small hex head bolt | JIS B 1180 | Reduced head across flats | Compact machinery, Japanese equipment platforms |
| Drilled head / shank bolt | GOST 7796, BS 1768 | Cross-drilled for locking wire | Rail, mining and safety-critical assemblies |
| Tension control bolt | ASME B18.2.6 | Spline end, high strength | Fast steel erection, one-side tightening |
Materials, Grades and Surface Treatment
We machine hex head bolts from carbon steel, low-alloy steel and stainless steel. Grade selection follows the load case and the corrosion exposure of the joint, not a default preference.
- Carbon and low-alloy steel: property classes 4.8, 5.8, 8.8, 10.9 and 12.9, with 8.8 and 10.9 covering most structural and machinery work.
- Stainless steel: A2 and A4 grades for chemical, food, marine and outdoor environments where plating is not acceptable.
- Zinc electroplating: general indoor and light outdoor protection with controlled thread allowance.
- Hot-dip galvanizing: heavy outdoor and infrastructure service, with threads cut or chased after coating to keep nut engagement.
- Blackening: oiled oxide finish for high-strength structural bolts and machinery where dimensional control matters more than corrosion resistance.
Critical Specifications We Confirm Before Production
A hex bolt drawing is only complete when the functional dimensions and the inspection basis are both defined. We confirm the following points with the customer before releasing a production lot.
Dimensional Control
Thread pitch and class, shank diameter, head across flats and across corners, head height, thread length and total length under head.
Mechanical Properties
Tensile strength, proof load, hardness, impact behaviour at service temperature and, where required, wedge and head soundness testing.
Thread Fit and Coating
Go/no-go gauge verification, coating thickness, hydrogen embrittlement relief for high-strength plated parts, and friction behaviour where preload is specified.
Where Hexagon Head Bolts Fit in the Assembly
The flat six-sided head gives reliable wrench access from multiple angles with standard sockets and spanners, which is why hex head bolts remain the first choice for field assembly and maintenance. Full-thread bolts suit clamped stacks and joints that need adjustment range; partial-thread bolts keep the unthreaded shank in the shear plane and are preferred for structural connections.
For joints that need a wider bearing face, our Hexagon Flange Bolts integrate the washer function into the head. Where the joint is tightened from one side only, T-head Bolts slot into a machined channel and resist rotation. For timber and through-bolted structures, Round Head Bolts(Carriage Bolt) provide a low-profile head with a square neck that bites into the material.
Hex head bolts are normally paired with matching nuts and washers. Our Hexagon Nuts are produced in the same property classes and thread systems, so bolt, nut and washer arrive as one matched set with consistent coating and tolerance.
Production Capacity and Workshop Control
Our bolt workshops run alongside nut, washer and screw production, which keeps the supply chain from raw material to finished fastener under our own control. Annual output exceeds 20,000 tons across 12 energy-efficient production lines, including automatic shell moulding and four heat treatment lines. That capacity supports large structural programmes while remaining responsive to small and medium batches.
Hot forging, thread rolling, heat treatment and surface finishing are sequenced with inspection after each process. Threads are rolled rather than cut, which preserves the grain flow of the material and gives more consistent nut engagement under static and dynamic load.
Quality Assurance and Acceptance Testing
Our in-house laboratory carries a spectrometer, coordinate measuring machine, X-ray flaw detector and mechanical testing equipment. Chemical composition, mechanical properties, non-destructive testing and geometric dimensions are monitored through the production run, and finished goods are inspected against the customer specification and the referenced international standard.
- Inspection records and material certificates issued with the shipment on request.
- Sampling plans agreed at order stage for dimensional, hardness and tensile checks.
- Third-party inspection coordinated when the project requires an independent release.
- Marking of grade and manufacturer identification on the head where the standard requires it.
Customization, Packaging and Delivery Scope
Custom production is our core business. We develop hex head bolts from customer drawings or physical samples, including non-standard head dimensions, special thread lengths, drilled heads, reduced shanks and specific coating systems. Our engineering team reviews the drawing for manufacturability and confirms tolerances before tooling is committed.
Packaging is matched to the sales channel: bulk export cartons, labelled bags, blister packs and retail kits. We are located within a short drive of Shanghai and Ningbo ports, so sea freight is our main shipping mode, with air freight available for urgent deliveries. DDP delivery to the customer's door can be arranged where the project calls for it.
Information We Use to Configure Your Solution
A precise quotation depends on the joint, not only the bolt. The following inputs let us select the correct standard, grade, finish and inspection plan.
| Input | What It Determines |
|---|---|
| Drawing or sample with dimensions | Standard reference, head form, thread length, tolerances |
| Thread size, pitch and class | Gauge selection, nut matching, coating allowance |
| Property class or material grade | Steel selection, heat treatment cycle, test programme |
| Service environment | Zinc, hot-dip galvanizing, blackening or stainless |
| Quantity and delivery schedule | Batch planning, tooling amortisation, shipping mode |
| Inspection and documentation requirements | Test scope, certificates, marking, third-party release |
| Packaging and labelling format | Carton, bag, kit or retail presentation |
Maintenance, Spare Parts and Serviceability
Hex head bolts are serviceable with standard tools, which keeps field maintenance simple. For equipment programmes, we retain the production parameters of repeat orders so replacement bolts match the original grade, coating and thread fit. Where a joint is dismantled regularly, we can supply matched bolt, nut and washer sets in the same finish to avoid mixed hardware on site.
Frequently Asked Questions
Which standards can you produce hexagon head bolts to?
We produce to DIN 931, DIN 933, DIN 960, DIN 609, DIN 6914, DIN 7964, ISO 4014, ISO 4017, ASME/ANSI B18.2.3.5M, ASME B18.2.6, JIS B 1180, GOST 7796 and BS 1768, as well as customer drawings that fall outside these systems.
What is the difference between DIN 931 and DIN 933 bolts?
DIN 931 is the partial-thread version, with an unthreaded shank that sits in the shear plane of a structural joint. DIN 933 is fully threaded and is used where the clamped thickness varies or the bolt must be adjustable along its length.
Can you supply hex bolts with hot-dip galvanizing?
Yes. Hot-dip galvanizing is one of our standard finishes for outdoor and infrastructure work. Threads are cut or chased after coating so the nut still engages correctly, and coating thickness is checked before packing.
Do you produce non-standard hex head bolts from drawings?
We do. Custom development from drawings or samples is our core business, covering special head dimensions, thread lengths, drilled heads, reduced shanks and specific coating systems. Our engineers review the drawing and confirm tolerances before production starts.
What documentation is supplied with a hex bolt order?
Inspection records and material certificates are issued with the shipment on request, covering chemical composition, mechanical properties and dimensional results. Third-party inspection can be coordinated when the project requires an independent release.
How are hex bolts packed and shipped?
Packing follows the sales channel, from bulk export cartons to labelled bags, blister packs and retail kits. Sea freight is our main shipping mode from Shanghai and Ningbo, with air freight for urgent deliveries and DDP delivery available where required.
