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UNC UNF machine screw 1/4 inch Wholesale from Manufacturers

I’m providing the UNC UNF machine screw 1/4 inch to Wholesale buyers and Manufacturers who need reliable fasteners for bulk projects. You’ll find both UNC 1/4-20 and UNF 1/4-28 thread options, with finishes in stainless steel, alloy steel, and zinc plated, all built to tight tolerances. I focus on corrosion resistance, consistent head dimensions, and proven torque under load, so your assembly lines stay efficient. This screw pairs perfectly with standard nuts and inserts, simplifying inventory for large orders. I understand the needs of bulk purchasing and quick turnaround, so I offer flexible packaging, competitive Wholesale pricing, and scalable supply for Manufacturers. If you want samples, certifications, or lead-time details, I’ve got you covered. Choose me as your go-to source for 1/4 inch UNC/UNF machine screws and you’ll get dependable performance and a partner who treats bulk orders like a top priority.

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UNC UNF machine screw 1/4 inch Exceeds Industry Benchmarks Your Trusted OEM Partner

Global engineers rely on a 1/4 inch machine screw—UNC or UNF—for precise, repeatable assemblies. Tight dimensional tolerances, clean thread geometry, and controlled metallurgy ensure dependable engagement and durability across batches. With alloy steel or stainless options and finishes such as zinc plating, black oxide, or passivation, these fasteners adapt to diverse environments. Rigorous quality programs and full traceability support every lot through inspection and PPAP readiness. As an OEM-focused partner, we enable global buyers with scalable production, customized options, and reliable delivery. From head styles and lengths to coatings, we tailor fasteners to your design. Our processes support rapid prototyping, documentation, and practical packaging for stocking or Kanban. For applications demanding durability and precision, 1/4 inch UNC/UNF machine screws provide a solid foundation for secure joints, corrosion resistance, and long service life across industries.

UNC UNF machine screw 1/4 inch Exceeds Industry Benchmarks Your Trusted OEM Partner
Variant Thread Pitch (TPI) Major Diameter (in) Material Finish Tensile Strength (MPa) Yield Strength (MPa) Hardness (HRC) Elongation (%) Temperature Range (°C) Typical Applications Notes
1/4-20 UNC 20 0.250 Alloy steel, quenched & tempered Zinc plated (HDG) 800 640 30–34 8–12 -40 to 120 Electronics enclosures; automotive sub-assemblies; general machinery Coarse thread for quicker assembly; standard tolerance
1/4-28 UNF 28 0.250 Alloy steel, quenched & tempered Zinc plated (HDG) 800 640 30–34 8–12 -40 to 120 Precision assemblies; thin components; electronics housings Fine thread offers better tension control and vibration resistance

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UNC UNF machine screw 1/4 inch Industry Giant Delivers Unmatched Quality

Quality Metrics Across Production Batches

Dimensional Tolerance (mm) Torque Consistency (N·m) Tensile Strength (MPa)

Explanation: This visualization presents three quality metrics tracked across twelve production batches for a reference set of precision screws. Dimensional tolerance measures the deviation from the target thread diameter, indicating manufacturing precision and process stability. Torque consistency reflects the reproducibility of assembly torque, which affects fastening reliability and downstream performance. Tensile strength represents the material's mechanical resistance, influenced by alloy composition and heat-treatment processes. The x-axis shows batch numbers acting as a production timeline, while the y-axis captures the respective metric values after normalization to enable cross-metric comparison.

From batch 1 to batch 7, dimensional tolerance declines from 0.12 mm to around 0.06–0.07 mm, suggesting a learning curve in tooling setup, better calibration, and improved control of threading operations. After batch 7, a modest uptick in tolerance appears, potentially due to tool wear or temperature fluctuations that warrant preventive maintenance checks. Torque peaks near batch 7 at 0.30 N·m, then gradually declines to about 0.24–0.26 N·m by batch 12. This could reflect adjustments in release force, lubrication, or batch-to-batch material variations. Tensile strength shows a steady increase, rising from 520 MPa to 555 MPa across the same period, indicating successful material processing refinements and consistent heat-treatment outcomes.

Overall, the combination of these indicators highlights how sharpening tooling stability and lubrication strategy can harmonize with material processing to drive long-term quality gains. The data suggests opportunities to reinforce preventive maintenance after mid-series, align torque settings with observed tolerance shifts, and continue material process optimization to sustain tensile strength improvements. Integrating these metrics supports proactive quality control, reduces scrap, and helps ensure reliable performance in demanding assembly applications.

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  • Joa 2022.12.22 02:43:35

    As an international trading company, we have numerous partners, but about your company, I just want to say, you are really good, wide range, good quality, reasonable prices, warm and thoughtful service, advanced technology and equipment and workers have professional training, feedback and product update is timely, in short, this is a very pleasant cooperation, and we look forward to the next cooperation!

  • Donna 2022.12.19 03:31:49

    In China, we have many partners, this company is the most satisfying to us, reliable quality and good credit, it is worth appreciation.

  • Poppy 2022.12.16 22:47:16

    The company can think what our think, the urgency of urgency to act in the interests of our position, can be said this is a responsible company, we had a happy cooperation!

  • Brook 2022.12.15 03:23:52

    We are a small company that has just started, but we get the company leader's attention and gave us a lot of help. Hope we can make progress together!

  • Yannick Vergoz 2022.12.13 10:51:51

    The customer service reprersentative explained very detailed, service attitude is very good, reply is very timely and comprehensive, a happy communication! We hope to have a opportunity to cooperate.

  • Henry 2022.12.03 06:51:58

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

  • Joanna 2022.12.27 13:58:05

    This supplier's raw material quality is stable and reliable, has always been in accordance with the requirements of our company to provide the goods that quality meet our requirements.

  • Elva 2022.12.19 04:47:13

    The accounts manager made a detailed introduction about the product, so that we have a comprehensive understanding of the product, and ultimately we decided to cooperate.

  • Mandy 2022.12.09 10:23:58

    The accounts manager made a detailed introduction about the product, so that we have a comprehensive understanding of the product, and ultimately we decided to cooperate.

  • Arabela 2022.12.08 11:48:32

    We have been cooperated with this company for many years, the company always ensure timely delivery ,good quality and correct number, we are good partners.

  • Wendy 2022.12.07 09:53:33

    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!

  • Elsie 2022.12.04 07:51:24

    A good manufacturers, we have cooperated twice, good quality and good service attitude.

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