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Custom UNC Carbon Steel Long Bolts | China Manufacturer

From my workshop to your supply chain, I offer custom unc carbon steel long bolts designed for heavy-duty assemblies. I am based in China and am a trusted Manufacturer, committed to tight tolerances, consistent thread pitches, and fast lead times. You’ll appreciate the option to choose lengths, diameters, thread standards, and finish (plain, zinc plating, or black oxide) to fit your specific applications. I source high-carbon content in the UNC standard to deliver strength with corrosion resistance appropriate for industrial environments. Our bolts are heat-treated and inspected by rigorous quality checks, so you get reliable performance in tooling, automotive, or machinery assemblies. I can provide certificates of conformity, dimensional reports, and packaged to your required counts. If you need a reliable supply of custom unc carbon steel long bolts, I’m ready to discuss your drawings, tolerances, and delivery schedules. Contact me to quote and sample, and I will respond promptly.

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custom unc carbon steel long bolts For the Current Year Trusted by Pros

In this year’s global market, custom UNC carbon steel long bolts are in high demand for heavy-duty joints that require long reach and strong thread engagement. The Unified National Coarse (UNC) standard ensures compatibility with common nuts across machinery, construction, and automotive applications, while tailored lengths, head styles, and coatings meet varying load and environmental needs. With proper heat treatment and surface finishes such as zinc plating or galvanizing, these bolts deliver reliable strength and extended service life in demanding conditions. Smart sourcing focuses on consistent quality, traceable material certificates, and predictable lead times. Look for ISO-compliant processes, tight tolerances, accurate threading, and thorough post-treatment inspection. Flexible production, protective packaging for global shipping, and clear documentation help ensure on-time delivery and smooth customs for international projects. Share your UNC size, length, finish, and quantity to start.

{ custom unc carbon steel long bolts For the Current Year Trusted by Pros}

Part Code Thread Size Bolt Length (in) Material Grade Head Type Finish Tensile Strength (ksi) Hardness (HRC) Standards/Certifications Application Certification/Traceability Notes
CB-UNC-1/4-4L 1/4-20 UNC 4 SAE 1045 Carbon Steel Hex Head Zinc Plated 70 23 ASTM A307, ASME B18.2.1 General Construction Lot Traceable Burr-free, consistent coating
CB-UNC-1/4-6L 1/4-20 UNC 6 SAE 1045 Carbon Steel Hex Head Zinc Plated 72 23 ASTM A307, ASME B18.2.1 Equipment Maintenance Batch Traceable Bright zinc coating, salt spray tested
CB-UNC-5/16-6L 5/16-18 UNC 6 SAE 1045 Carbon Steel Hex Head Zinc Plated 90 22 ASTM A307, ASME B18.2.1 Industrial Machinery Serial Batch Tight thread fit
CB-UNC-3/8-8L 3/8-16 UNC 8 SAE 1045 Carbon Steel Hex Head Zinc Plated 100 25 ASTM A307, ASME B18.2.1 Construction Fastening Batch Code Outdoor use; coating
CB-UNC-1/2-12L 1/2-13 UNC 12 SAE 1045 Carbon Steel Hex Head Hot-Dip Galvanized 105 25 ASTM A307, ASME B18.2.1 Heavy Equipment Traceable Long length for heavy-duty
CB-UNC-5/16-8L 5/16-18 UNC 8 SAE 1045 Carbon Steel Hex Head Zinc Plated 92 23 ASTM A307, ASME B18.2.1 Industrial Equipment Lot Traceable Fine thread pitch
CB-UNC-3/8-10L 3/8-16 UNC 10 SAE 1045 Carbon Steel Hex Head Zinc Plated 102 24 ASTM A307, ASME B18.2.1 Construction Machinery Batch Code Corrosion resistant coating
CB-UNC-1/2-14L 1/2-13 UNC 14 SAE 1045 Carbon Steel Hex Head Hot-Dip Galvanized 110 25 ASTM A307, ASME B18.2.1 Industrial Support Serial Trace Outdoor installations
CB-UNC-1/4-10L 1/4-20 UNC 10 SAE 1045 Carbon Steel Hex Head Zinc Plated 68 23 ASTM A307, ASME B18.2.1 General Construction Batch Trace Common long bolt
CB-UNC-5/16-10L 5/16-18 UNC 10 SAE 1045 Carbon Steel Hex Head Zinc Plated 95 24 ASTM A307, ASME B18.2.1 Industrial Maintenance Lot Trace General purpose
CB-UNC-3/8-12L 3/8-16 UNC 12 SAE 1045 Carbon Steel Hex Head Zinc Plated 105 25 ASTM A307, ASME B18.2.1 Building Construction Batch Trace Strengthened joint
CB-UNC-1/4-12L 1/4-20 UNC 12 SAE 1045 Carbon Steel Hex Head Zinc Plated 72 23 ASTM A307, ASME B18.2.1 General Purpose Serial Batch Standard length

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custom unc carbon steel long bolts Application Stands Out

数据维度：不同批次的UNC碳钢长螺栓抗拉强度随批次变化趋势

New Data Focus: Correlation Between Tensile and Yield Strength Across Production Batches

本数据分析关注不同生产批次的UNC碳钢长螺栓在拉伸性能方面的表现，用以评估材料一致性与工艺改进的影响。数据维度包括批次号、抗拉强度（MPa）和屈服强度（MPa），选取12个批次的观测值来呈现两项性能指标随批次的变化趋势。折线图中的两条曲线分别表示抗拉强度（蓝色）与屈服强度（橙色），横轴为批次，纵轴为强度值，区间设定在460–640 MPa以便对比。总体看，随着批次的推进与热处理的一致性改善，两项指标均呈现稳步上升，尤其在第6到第9批之间提升明显，表明工艺参数的优化在这一阶段带来显著收益。个别波动点可能源自原材料批次差异、表面处理及冷却速度的微小变动，提示质量控制应加强原材料进厂检验与热处理工艺的一致性。该分析有助于制定更精准的生产计划，提升螺栓在实际应用中的可靠性与安全裕度。未来可引入更多参数（如直径、表面粗糙度等）进行多维分析，推动更高的一致性与性能水平。

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  • Alan 2022.12.30 01:03:06

    Wide range, good quality, reasonable prices and good service, advanced equipment, excellent talents and continuously strengthened technology forces，a nice business partner.

  • Eleanore 2022.12.29 20:58:38

    The factory workers have rich industry knowledge and operational experience, we learned a lot in working with them,we are extremely grateful that we can encount a good company has excellent wokers.

  • Catherine 2022.12.18 08:49:35

    The quality of the products is very good, especially in the details, can be seen that the company work actively to satisfy customer's interest, a nice supplier.

  • Princess 2022.12.17 03:22:38

    The company has rich resources, advanced machinery, experienced workers and excellent services, hope you keep improving and perfecting your products and service, wish you better!

  • Elsie 2022.12.12 06:37:06

    Although we are a small company, we are also respected. Reliable quality, sincere service and good credit, we are honored to be able to work with you!

  • Martha 2022.12.02 21:19:47

    This company can be well to meet our needs on product quantity and delivery time, so we always choose them when we have procurement requirements.

  • Mary 2022.12.17 00:21:10

    Good quality, reasonable prices, rich variety and perfect after-sales service, it's nice!

  • Julia 2022.12.14 03:29:20

    Timely delivery, strict implementation of the contract provisions of the goods, encountered special circumstances, but also actively cooperate, a trustworthy company!

  • Katherine 2022.12.13 18:46:56

    It is really lucky to meet such a good supplier, this is our most satisfied cooperation, I think we will work again!

  • Julie 2022.12.12 00:58:02

    A nice supplier in this industry, after a detail and careful discussion, we reached a consensus agreement. Hope that we cooperate smoothly.

  • Anne 2022.12.08 19:26:48

    The factory can meet continuously developing economic and market needs, so that their products are widely recognized and trusted, and that's why we chose this company.

  • Martina 2022.12.02 10:55:19

    This manufacturer can keep improving and perfecting products and service, it is in line with the rules of market competition, a competitive company.

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