Stainless Steel Pan Head Screw with Flat and Spring Washers – a DIN7985-compliant, pre-assembled fastening solution featuring a large pan head, stainless steel body, and integrated flat & spring washers. The oversized head increases contact area, preventing surface damage, ideal for thin sheets and precision assemblies. Washers are pre-fitted and fixed via thread rolling for secure, error-free installation, boosting efficiency for both automated lines and on-site maintenance.
Made from high-quality 304 stainless steel (C≤0.08%, Cr≥18%, Ni≥8%) with 72+ hours salt spray resistance; premium 316 stainless steel option resists harsh chloride environments up to 200+ hours. Components are precision-made (6g thread tolerance, flat washer ≤0.03 mm, spring washer opening 8°–12°) for anti-loosening and vibration resistance.
Widely used in electronics, home appliances, automotive parts, marine equipment, and furniture hardware. Supports neutral export packaging and custom branding, making it a reliable choice for global manufacturing 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.