BP1: 50x Bolts, 50x Nuts, 50x Washers. Material: Acrylic / PC. Type: Socket Head Bolts. Length: 20 mm. Diameter: 4 mm. Pitch: 0.7 mm. SKU: 518.. BP2: Exhibiting high transparency of up to 92% and reflectance of roughly 4%, PC is a good alternative to glass.. BP3: Polycarbonate has moderate chemical resistance to mild acids, alcohols, and oils.. BP4: It has low moisture absorption, excellent electrical insulation properties, and is naturally flame-retardant and self-extinguishing.. BP5: Hex key fastening allows for higher torque and secure fastening under load.. || PRODUCT DESCRIPTION SUMMARY: Polycarbonate - has a light transmission of up to 92%, making it a popular alternative to glass in applications where optical clarity is required. It has inherent UV resistance, blocking up to 90% of UV. The material is moisture resistant, strong, durable and lightweight, with impact resistance at least 200 times greater than glass.. || Please see the technical image illustration for size references. All measurements are in millimetres/millimeters. || Product Details: Size_Ref: M4 x 20mm. Colour_Ref: Clear. Material_Ref: Acrylic / Polycarbonate. Type_Ref: Socket Head Bolts. Quantity_Ref: 50. || Dimensions (L x W x D mm): 20 x 4 x 4. || Additional Specifications: Pitch_MM: 0.7. Washer_Dimension: Stock Code: CR06591PCMaterial: PolycarbonateMaterial Reference: PC/W0Head/Drive Type: Flat washersize: M4W0 A: 8.82 mmW0 B: 4.39 mmW0 T: 0.8 mm Nut_Dimension: Stock Code: CR06482PCMaterial: PolycarbonateMaterial Reference: PC/HNHead/Drive Type: Hexagon Nutsize: M4N (mm): M4HN B: 6.89 mmHN H: 3.05 mm Bolt_Dimension: Stock Code: CR02210PCHead/Drive Type: Socket Hex Head Boltsize: M4 x 20D: 4 mmPitch: 0.7 mmL: 20 mmHD: 7 mmHH: 3.91 mmHS: 3.05 mm