A503 7075 Aluminium Quick Buckle, 3 or 4 mm

The A503 is specified in 7075 aluminium alloy, a high-strength grade often chosen for load-bearing hardware, and can be made in 3 mm or 4 mm thickness. The product photo shows a square frame with a black finish. A stainless steel version is listed as the 503SS.

The choice of thickness lets a designer balance weight against stiffness and wear: 3 mm keeps the buckle lighter, while 4 mm gives more material where the webbing bears on the frame. Frames of this kind are used as quick buckles and keepers on harness leg and chest straps, positioning belts and equipment straps.

No breaking strength is published for the A503, so buyers should define the rating their product needs and confirm it by testing samples in the actual webbing. State the thickness, webbing width, finish and colour, and marking in the RFQ, and request a drawing. OEM and private-label supply of the A503 is possible, as are modifications made to a customer drawing.