Material & Grade Options
You get stable, low-cost bolt performance with our low carbon / mild steel machining service. We stock and machine all common global equivalents, so you can source to your local standard without redesign.
Common Low Carbon Steel Grades We Machine
| Standard | Grad | Typisk bruksområde |
|---|---|---|
| SAE / AISI | 1008, 1010 | Small cold-headed bolts, nuts, formed parts |
| SAE / AISI | 1018, 1022 | Hex bolts, carriage bolts, threaded specials |
| EN / ISO | C10C | General-purpose mild steel fasteners |
| China GB | Q235B | Structural bolts, anchor bolts |
| EN | S275JR | Structural and machinery bolts |
| ASTM | A36 | Anchor bolts, base plate bolts, heavy hardware |
| SAE J403 | Equivalents | Custom spec per drawing and material call-out |
We cross-reference SAE J403, GB, EN, og ASTM grades in-house to meet your drawing and local code.
Typical Mechanical Properties (Reference)
Values below are indicative ranges for low carbon steels in bolt applications (as-rolled / normalized, non-alloyed). Final properties depend on diameter, process, and heat treatment.
| Grade (Typical) | Strength Class Target | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation A5 (%) | Hardheit (HB) |
|---|---|---|---|---|---|
| SAE 1008 / 1010 | 4.6 | 330–420 | 200–260 | 28–35 | 90–120 |
| SAE 1018 | 4.8 / 5.6 | 400–550 | cURL Too many subrequests. | cURL Too many subrequests. | 110–140 |
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We combine cold forging with our broader produksjonsprosesskapabilitetar to keep both cost and lead time under control.
Full CNC Turning & Milling
When your design goes beyond standard shapes, we switch to full CNC machining:
- CNC turning for precision turned steel bolts, shoulder bolts, and long shank parts
- CNC milling for eye bolts, T-head bolts, square head bolts, and other non-standard heads
This process is best for:
- Low to medium quantities
- Complex geometry and custom threaded mild steel fasteners
- Tight tolerances and special fits that cold heading can’t achieve
Thread Rolling vs Cut Threading
We offer both thread rolling og cut threading for low carbon steel bolts:
- Thread rolling
- Forms the thread by cold deformation
- Better fatigue strength and smoother surface
- Faster and more economical for standard metric, UNC, UNF threads
- Ideelt for cold forged low carbon fasteners
- Cut threading
- Threads are machined by cutting
- Flexible for short runs, prototypes, and special thread profiles
- Suitable for large diameters and custom pitches
We’ll choose the most suitable method based on material, size, strength class, and your annual usage.
In-House Heat Treatment & Surface Finishing
To control performance and appearance from end to end, we handle:
- Varmebehandling for strength adjustment and stress relief of mild steel bolts
- Overflatebehandling and coatings such as zinc, black oxide, and phosphating, supported by our dedicated overflatebehandlingstjenester
Keeping these processes in-house helps us:
- Oppretthald consistent quality
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- Custom threads for OEM designs and special fastener systems
- Machining tolerance: cURL Too many subrequests. ±0.02 mm on critical dimensions for tight-fit and precision assembly.
Om du trenger custom threaded mild steel fasteners for an OEM project or standard CNC machined mild steel bolts for repeat production, we hold size and thread consistency batch after batch, making your assembly work faster, safer, and more predictable.
Surface Treatment & Coating for Low Carbon Steel Bolts
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Main Coating Options
| Coating / Treatment | Appearance | Typisk bruksområde | Corrosion Resistance* |
|---|---|---|---|
| Zinc plating Cr³⁺ | Bright / blue/clear | General industrial, RoHS compliant | ★★–★★★ |
| Zinc plating Cr⁶⁺ | Yellow / iridescent | Legacy specs where still permitted | ★★★ |
| HDG (Hot-dip galvanized) | Thick grey matt | Structural, outdoor, anchor bolts, wind & solar | ★★★★ |
| Geomet | Silver / grey | Automotive, structural, no hydrogen embrittlement | ★★★★ |
| Dacromet | Silver / grey | Heavy corrosion, brake / chassis parts | ★★★★ |
| Black oxide | Black matt | Indoor, aesthetic, low friction with oil | ★★ |
| Phosphating + oil | Dark grey / black | Assembly bolts, anti-galling, paint base | ★★ |
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- RoHS and REACH compliance statements for coatings like zinc plating, black oxide, phosphating, and Geomet/Dacromet
- PPAP Level 3 documentation for automotive, trailer, and IATF 16949 projects
If you need deeper process visibility or want to audit our system, you can review our capabilities on our dedicated produksjonstenester side.
Advanced Measurement & Corrosion Testing
For high-spec custom low carbon steel bolts and structural fasteners, we can supply additional reports:
- CMM-inspeksjonsrapporter for tight tolerances down to ±0.02 mm on precision turned steel bolts
- Salt spray test reports (neutral salt spray) for zinc plated low carbon bolts, HDG, Geomet, and Dacromet-coated parts, according to your required hours
All reports are shared in clear PDF format so your quality team can plug them directly into your own PPAP or project documentation.
Industries & Typical Applications for Low Carbon Steel Bolts
Vår low carbon steel bolts machining service is built for high-volume, real-world use. We focus on consistent quality, tight tolerances, and coatings that survive tough environments.
Construction & Scaffolding
Vi leverer A36, Q235, S275JR and 4.6 / 4.8 structural bolts for:
- Scaffolding joints and couplers
- Formwork systems and temporary structures
- Building frames, handrails, and walkways
Smooth threads, reliable zinc or HDG coatings, and strong but ductile material make assembly faster and safer on site.
Automotive & Trailer
Vi produserer CNC machined mild steel bolts for:
- Trailer chassis and tow hitches
- Suspension brackets and axle fixtures
- Body mounting and light commercial vehicles
For automotive and related sectors we follow strict process control and inspection similar to our precision machining services for industrial components.
Agricultural Machinery
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- Harvesters, planters, and spreaders
- Frames, guards, and wear part mounting
- Implement hitch systems and brackets
Tough coatings like HDG, Geomet, and Dacromet help parts survive mud, fertilizer, and outdoor storage.
Renewable Energy (Wind Tower & Foundation)
Vi maskinerer large-size flange and anchor bolts (e.g. M20–M48) for:
- Wind tower base rings
- Foundation and anchor systems
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For most custom low carbon steel bolts:
- Typisk leveringstid: 18–28 days after order confirmation
- Time covers tooling, production, basic inspection, and standard export packing
- Urgent projects: we can pull capacity forward if material is ready
Proven Supplier for Global Customers
Since 2009, we’ve supplied custom mild steel bolts and fasteners to customers across Europe, North America, and Asia:
| Track Record | Numbers |
|---|---|
| Years in fastener manufacturing | 15+ years |
| Global clients served | 400+ OEMs, distributors, and EPCs |
| Typical cooperation model | Long-term contracts & repeat orders |
Low carbon steel bolt market forecast:
If you’re ready to move from trial to stable supply, you can reach us directly via our main site at Vastmaterial – custom metal parts & fasteners.
Technical Resources for Low Carbon Steel Bolts Machining Service
I keep all the key data for low carbon steel bolts machining service in simple, ready-to-use formats. You don’t need to dig through standards; you can download and use these right away in your daily work.
Low Carbon Steel Bolt Grade Comparison (PDF)
You can request a compact PDF that compares the most common low carbon bolt grades I supply and machine:
| Steel Grade | Standard | Typical Strength Class | Typisk bruk |
|---|---|---|---|
| 1008/1010 | SAE J403 | 4.6 / 4.8 | Small hex bolts, screws, light duty |
| 1018/1022 | SAE J403 | 4.8 / 5.6 | Structural bolts, carriage bolts |
| Q235B | GB/T 700 | 4.6 / 4.8 | Construction bolts, plates |
| S275JR | EN 10025 | 4.6 / 4.8 | Structural & anchor bolts |
| A36 | ASTM A36 | 4.6 / 4.8 | Anchor bolts, base plate bolts |
This PDF helps you:
- Cross-check metric vs SAE vs Chinese vs EU grader
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| cURL Too many subrequests. | cURL Too many subrequests. | Tilstand | cURL Too many subrequests. |
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| cURL Too many subrequests. | 4.8 | cURL Too many subrequests. | cURL Too many subrequests. |
| cURL Too many subrequests. | 4.8 | Black oxide | cURL Too many subrequests. |
| cURL Too many subrequests. | 4.8 | cURL Too many subrequests. | cURL Too many subrequests. |
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| cURL Too many subrequests. | 12–20 | 240–480 |
| Geomet / Dacromet | cURL Too many subrequests. | 480–1000 |
| HDG (hot dip galvanized) | 40–80 | 600–1500 |
| Phosphate + oil | 5–10 | 24–72 |
*Values are typical ranges; I can provide actual salt spray test reports for your project.
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Customer Reviews & Case Studies – Low Carbon Steel Bolts Machining Service
European Wind Project – 120,000 pcs M20×110 Flange Bolts
For a European wind energy customer, we supplied 120,000 pcs M20×110 low carbon steel flange bolts, cold headed and CNC machined from Q235 / S275JR / SAE 1018 equivalents.
- Strength class: 4.8, with full 3.1 MTC og salt spray test reports
- Prosess: cold forging + secondary CNC + thread rolling + zinc plating
- Result: 0 claims, on‑time delivery in 3 partial shipments, all bolts passed on‑site fit-up and torque tests for wind tower flange connections.
Long-Term Contract – 800,000 pcs Grade 4.8 Hex Bolts
We support an OEM customer with an annual contract for 800,000 pcs Grade 4.8 low carbon steel hex bolts in mixed sizes.
- Materials: 1008 / 1010 / 1018 mild steel, optimized per size for best cost
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| Type | cURL Too many subrequests. | cURL Too many subrequests. | cURL Too many subrequests. |
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| cURL Too many subrequests. | cURL Too many subrequests. | 4.6 / 4.8 / 5.6 | cURL Too many subrequests. |
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- Fordelar:
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- High speed, stable quality
- Good use of low carbon steels like 1018, Q235
Full CNC machining – best for specials
- Ideal for: short runs, complex heads, shoulder bolts, eye bolts, custom threads
- MOQ: we start from 500 pcs for specials
- Fordelar:
- Maximum flexibility on geometry
- Tight tolerances (up to ±0.02 mm)
- Fast prototype and trial orders
Quick guide:
| Requirement | Best Process |
|---|---|
| Standard hex / flange bolt | Cold heading + machining |
| Large yearly volume | Cold heading + machining |
| Complex or non-standard | Full CNC turning & milling |
| Small batch / trial build | Full CNC machining |
You can send us both your annual volume and first order quantity; I’ll help pick the right route.
Can you supply strength class 4.6 / 4.8 / 5.6 / 8.8 in low carbon?
Yes. For low carbon steel bolts machining service, we regularly supply:
| cURL Too many subrequests. | Typical Material | Process Route |
|---|---|---|
| 4.6 | Q235, 1008, 1010 | Cold heading + thread rolling, no heat treatment |
| 4.8 | Q235B, 1018, C10C | Cold heading + controlled rolling, optional normalizing |
| 5.6 | 1018, 1022 | Cold heading + machining, light heat treatment |
| 8.8 (low carbon alloy / boron steel) | 10B21, 15B21, 1022M | Cold heading + quench & temper + thread rolling |
- We test tensile, yield, hardness, and elongation per ISO 898-1 / SAE J429.
- Full 3.1 material certificate, mechanical test report, and PPAP Level 3 are available on request.
If you need a specific strength class plus coating (e.g., zinc plated 4.8 hex bolts or HDG 8.8 anchor bolts), tell me your standard and working conditions, and I’ll match the right material + process for you.
Ready for a Quote on Low Carbon Steel Bolts?
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