Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D6255 – Standard Test Method Technical Guide
📐 Scope and Classification
This specification covers the material and fabrication of new reusable metal (slotted angle) crates intended for domestic and overseas shipment of lightweight airframe components and bulky items. The maximum gross weight is 3000 lb [1361 kg]. The standard defines various types, classes, and styles to meet different performance requirements but does not address performance under all atmospheric, handling, shipping, or storage conditions. Alternative construction methods are permitted if they provide equal or better performance as specified in the referenced practice.
⚠️ Safety Note: This standard does not address all safety concerns. Users are responsible for establishing appropriate safety, health, and environmental practices before use.
🛠️ Material Specifications
All crate components must conform to the following ASTM material standards. The table below summarizes key requirements from the referenced documents.
| 🟦 Material Type | 📏 Specification | 🎯 Typical Use | ⚡ Corrosion Protection |
|---|---|---|---|
| Cold-Rolled Steel Strip | A109/A109M | Structural members | Hot-dip galvanizing per A123/A123M |
| Aluminum Sheet and Plate | B209 | Lightweight panels | Optional coating per B633 |
| Steel Sheet (Hot-Dip Coated) | A924/A924M | General crate parts | Specified by coating class |
| Flat Steel Strapping | D3953 | Bundling and closure | Zinc or painted finish |
| Wood Members (if used) | D6199 | Lining or blocking | Treated per D6253 |
⚙️ Performance and Testing
While the specification details materials and fabrication, crate performance must be validated through testing per Practice D4169. This ensures resistance to distribution cycles including handling, stacking, and vibration. The standard notes that inch-pound and SI units are not exact equivalents and must be used independently to avoid nonconformance.
💡 Design Insight: Alternative construction methods (see 5.1.12) are acceptable only when proven to meet or exceed the performance of materials listed. Comparative testing using D4169 is recommended.
❓ Frequently Asked Questions
🔍 What is the maximum weight capacity for slotted angle crates under this standard?
Answer: The standard covers crates for loads not exceeding 3000 lb [1361 kg] for both domestic and overseas air or surface shipments.
💡 Which materials are primarily specified for crate fabrication?
Answer: Key materials include cold-rolled steel strip (A109/A109M) and aluminum sheet (B209), with corrosion protection through hot-dip galvanizing (A123/A123M) or electrodeposited zinc (B633).
⚡ How is crate performance tested and validated?
Answer: Performance testing is conducted according to Practice D4169, which simulates typical distribution environments to ensure the crate meets handling and shipping demands.
📌 Can alternative materials or methods be used?
Answer: Yes, if alternative construction provides equal or better performance than the specified materials and procedures, as per section 5.1.12. Comparative testing per D4169 is required.