What types of fasteners does YH Fastener manufacture?

We manufacture machine screws, self tapping screws, sealing screws, shoulder screws, sems screws, captive screws, security screws, nylon patch screws, carbide insert screws and set screws, plus hex keys, Torx keys and spring and ball plungers, in both standard and custom versions.

Can you produce non-standard screws from my drawings?

Yes. Our engineering team reviews 2D drawings, 3D models or physical samples, confirms material, head style, drive, thread and finish, and then builds tooling for cold heading and thread rolling. Non-standard and international-standard parts are both supported.

Which quality certifications does your factory hold?

Our production system operates under ISO 9001, ISO 14001 and IATF 16949. Every batch passes multi-stage inspection from incoming wire rod to final packing, and inspection records can be provided with shipments.

How do you prevent screws from loosening under vibration?

Depending on the application we recommend pre-applied nylon patches, sems screws with captive washers, or shoulder and sealing designs. The right solution is selected based on joint material, required re-use cycles, torque and operating temperature.

Do you export to my country and how do I start a project?

YH Fastener ships to more than 60 countries. Request our catalog or contact our sales engineers with your drawing, quantity and target application, and we will reply with a technical review within 24 hours.

OEM Pan Head Deep Recess Phillips SEMS Screw with Square Washer Supplier, Factory

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OEM Pan Head Deep Recess Phillips SEMS Screw with Square Washer Supplier, Factory

Pan head deep recess Phillips SEMS machine screw with square washer designed for stable positioning and efficient assembly in sheet metal structures.
Size: M0.8–M24 (custom drawing)
Material:
Stainless Steel (201/303/304/316/410/416/430)
Carbon Steel (1008/1012/1018/1022/1035/1039/40Cr)
Copper (H62/H65/H68)
Aluminum (5056/6061/6063/7075)
Alloy Steel (SCM435/10B21/6150/S2)
Surface:
Zinc, Nickel, Passivated, Tin
Black Oxide, Anodized, Polished, Chrome
Hot-Dip Galvanized (H.D.G)

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Frequently Asked Questions

Q1: What are SEMS screws and how do they work?

SEMS screws are pre-assembled screw and washer combinations where the washer is held captive beneath the screw head by the rolled threads, eliminating manual washer placement and speeding up production.

Q2: What materials and coatings are available for these fasteners?

Common base materials include carbon steel, alloy steel, and stainless steel (304, 316). Available surface finishes include zinc plating, nickel plating, black oxide, and customized anti-corrosion coatings.

Q3: What types of pre-assembled washers can be combined with SEMS screws?

Options include flat washers, split lock washers, external/internal tooth lock washers, conical spring washers, and custom plastic/insulating washers to meet vibration-proof or electrical insulation requirements.

Q4: Are SEMS screws suitable for automated assembly lines?

Yes. Because the washer is integrated and cannot detach, SEMS screws significantly reduce part handling and jamming, making them ideal for automated robotic and high-speed feeder assembly systems.

Q5: Can dimensions and drive types be customized according to drawings?

Yes, custom thread sizes (metric or inch), lengths, head designs (Pan, Hex, Truss, etc.), and drive types (Phillips, Torx, Slotted, Combination) can be manufactured per engineering drawings and specifications.

Q6: What industries most commonly utilize SEMS screws?

SEMS screws are widely used in automotive electronics, consumer appliances, telecommunications hardware, electrical control cabinets, and industrial machinery where fastening reliability and efficiency are critical.

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