Stainless Steel Pan Head Screw with Flat and Spring Washers
The Stainless Steel Pan Head Screw with Flat and Spring Washers is a DIN7985-compliant, pre-assembled fastening solution. It features a large pan head, a stainless steel body, and integrated flat and spring washers. In addition, the oversized head increases the contact area and helps prevent surface damage. Therefore, it is ideal for thin sheets, delicate materials, and precision assemblies.
Efficient and Secure Installation
Shenhu pre-fits the flat and spring washers and secures them through thread rolling. As a result, they remain firmly in place during transportation and installation. This design reduces assembly errors and improves fastening consistency. Moreover, it increases efficiency for both automated production lines and on-site maintenance operations.
High-Quality Stainless Steel Construction
We manufacture the screw from premium 304 stainless steel (C≤0.08%, Cr≥18%, Ni≥8%). It provides more than 72 hours of salt spray resistance, making it suitable for demanding industrial environments. Furthermore, we offer a 316 stainless steel option for applications exposed to chloride-rich conditions. This version can withstand more than 200 hours of salt spray testing and offers enhanced corrosion resistance.
Precision Components for Reliable Performance
Shenhu produces all components under strict dimensional control. The thread tolerance meets 6g standards, while the flat washer thickness tolerance is maintained at ≤0.03 mm. Meanwhile, the spring washer opening angle is controlled between 8° and 12°. Together, these features improve anti-loosening performance and vibration resistance in long-term service conditions.
Applications Across Multiple Industries
Manufacturers widely use this fastening solution in electronics, home appliances, automotive components, marine equipment, and furniture hardware. In addition, it supports both neutral export packaging and custom branding options. Consequently, it is a reliable choice for global manufacturers, distributors, and high-end export markets.
| Section | Specification |
|---|---|
| Standard & Structure | DIN7985-compliant; pre-assembled “stainless steel pan head screw + custom flat washer + spring washer”; large pan head design, 15–20% larger diameter than standard pan heads for increased contact area. |
| Thread Size & Tolerance | Nominal diameters M3–M10; coarse metric pitch (M3:0.5 mm, M4:0.7 mm, M5:0.8 mm, M6:1.0 mm, M8:1.25 mm, M10:1.5 mm); thread tolerance 6g; thread angle deviation ≤±1°; cumulative pitch error ≤±0.03 mm/100 mm; smooth engagement per ISO 3408. |
| Key Dimensions | Screw length 6–80 mm (M3 6 mm, M10 80 mm); head thickness 2.4–6.8 mm (M3 2.4 mm, M10 6.8 mm); chamfered edges R0.3–R0.5 mm to prevent surface damage. |
| Flat Washer | Outer diameter matched to pan head (M3 9 mm, M10 22 mm); thickness 0.8–2.0 mm; flatness ≤0.02 mm; surface roughness Ra ≤1.6 μm. |
| Spring Washer | Inner diameter clearance ≤0.12 mm; opening width 1.2–3.0 mm (M3 1.2 mm, M10 3.0 mm); elastic stiffness 15–45 N/mm; no permanent deformation ≤15% compression. |
| Material & Mechanical Properties | 304 Stainless Steel (Standard): C≤0.08%, Cr≥18%, Ni≥8%, tensile ≥520 MPa, yield ≥205 MPa, elongation ≥40%, hardness ≤201 HB. 316 Stainless Steel (High Corrosion Resistance): Mo≥2%, tensile ≥515 MPa, yield ≥170 MPa, elongation ≥40%, salt spray ≥200 h. 316L Stainless Steel (Ultra Corrosion Resistance, optional): C≤0.03%, tensile ≥485 MPa, yield ≥170 MPa, salt spray ≥500 h. |
| Assembly Performance | Screw + washers coaxiality ≤0.25 mm; tightening torque (M6: 22 N·m, M8: 45 N·m) with ±8% fluctuation; anti-loosening verified by 1000 vibration cycles (10–50 Hz, 0.5 mm amplitude). |
| Surface Treatment & Environmental Resistance | Native passivation: 0.5–1.5 μm uniform film, fingerprint & oxidation resistant, RoHS & REACH compliant. Electro-polished: Ra ≤0.8 μm, gloss ≥85°, ideal for hygiene-sensitive applications. Sandblasted: uniform matte finish, increased friction for outdoor equipment assembly. |
Reviews
There are no reviews yet.