Specification for 32 x 7 mm Corded Strap Buckle

por WangColin 23 de abril de 2025

2. Dimensional Specifications • Width (Strap Compatibility): 32 mm (1.26 inches) o Matches the width of the composite corded polyester strap to ensure a secure fit. • Wire Diameter: 7 mm (0.276 inches) o Refers to the thickness of the steel wire used to form the buckle, providing structural strength. • Overall Dimensions (Approximate): o Length: 40–45 mm (to accommodate strap width and folding). o Height: 15–20 mm (including wire bends). o These dimensions are typical for 32 mm buckles based on industry standards [Web ID: 0] [Web ID: 5]. • Inner Opening: o Designed with a central opening to allow the 32 mm strap to be folded double and passed through, typically 34–36 mm wide to accommodate the strap’s thickness (e.g., 0.8–1.0 mm total thickness with a 0.15 mm PP coating per side).

3. Material and Finish • Material: High-strength steel wire o Typically made from durable, corrosion-resistant wire steel to withstand high tensile forces [Web ID: 7] [Web ID: 16]. • Surface Finish Options: o Galvanized: Zinc coating (per ASTM A123) to protect against rust, ideal for humid environments like Ecuador (e.g., Guayaquil’s 70–90% humidity) [Web ID: 0] [Web ID: 5].  Zinc Coating Thickness: 10–15 µm (0.4–0.6 mils).  Corrosion Resistance: ≥500 hours in salt spray test (ASTM B117). o Phosphated: Alternative finish with a phosphate coating for additional grip and corrosion resistance, often used with woven or composite straps [Web ID: 8] [Web ID: 14].  Corrosion Resistance: ≥300 hours in salt spray test (ASTM B117). • Weight: Approximately 50–60 grams per buckle (based on similar 32 mm buckles) [Web ID: 0].

4. Performance Characteristics

• System Strength: o When used with a 32 mm composite corded polyester strap (e.g., 1500 daN linear breaking strength, as per [Web ID: 0]), the buckle ensures a system strength of 60–90% of the strap’s linear breaking strength. o Example: For a 1500 daN strap, system strength = 2 × 1500 × 0.8 (buckle efficiency) = 2400 daN (approximately 2400 kg) [Web ID: 8] [Web ID: 17]. • Tensile Load Capacity: o The 7 mm wire diameter ensures the buckle can handle loads up to 2000–2500 kg without deformation, depending on the strap’s strength [Web ID: 8]. • Joint Efficiency: 75–90%, meaning the buckle maintains a high percentage of the strap’s breaking strength at the joint [Web ID: 1] [Web ID: 8]. • Temperature Range: o Suitable for -40°C to 80°C (-40°F to 176°F), compatible with PP-coated polyester straps and humid environments like Ecuador. • Corrosion Resistance: o Galvanized buckles resist rust in humid conditions for 5–10 years; phosphated buckles offer slightly less corrosion resistance but better grip for strap retention [Web ID: 0] [Web ID: 14].

5. Design Features

• Structure: o Wire buckle with a rectangular shape and a central opening for strap passage. o The strap is folded double, passed through the opening, and secured by pulling tight, often with a tensioner [Web ID: 7] [Web ID: 16]. • Grip Mechanism: o Phosphated versions have an enhanced grip to prevent strap slippage [Web ID: 14]. o Galvanized versions provide smooth threading while maintaining hold [Web ID: 0]. • Ease of Use: o Designed for manual or tensioner-based application (e.g., with a heavy-duty tensioner for 32 mm straps) [Web ID: 24].

6. Applications

• Primary Use: Securing heavy loads such as 4-inch/5-inch Schedule 40 steel pipes (e.g., 41.78 kg for 2.6m 4-inch pipe) or 9mm blued steel strapping for export to Ecuador or Algeria. • Industries: Construction, logistics, steel manufacturing, agriculture (e.g., securing pipes, metal bundles, or palletized goods). • Environmental Suitability: Ideal for humid and coastal environments due to corrosion-resistant finishes [Web ID: 0].

7. Standards and Testing

• Manufacturing Standards: o Conforms to ASTM A123 (for galvanized finish) and ISO 9001 (for quality control) [Web ID: 0] [Web ID: 8]. • Testing: o Salt Spray Test (ASTM B117): ≥500 hours (galvanized), ≥300 hours (phosphated). o Tensile Test: Ensures system strength of 60–90% of strap’s linear breaking strength [Web ID: 8]. o Adhesion Test (for coating): No peeling or flaking of zinc/phosphate coating.

. Packaging and Availability • Packaging: Typically supplied in boxes of 250 pieces (standard for 32 mm buckles) [Web ID: 0] [Web ID: 5]. • Weight per Box: Approximately 12.5–15 kg (250 × 50–60 grams). • Availability: Compatible with 32 mm composite corded polyester straps (e.g., 1500 daN, 32 mm x 300 m rolls) [Web ID: 0].

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