起重吊环所采用的高强度高韧性特殊合金钢锻造而成均经过调质热处理。
Forged super alloy steel-Quenched Tempered.
逐件按照工作拉力的2.5倍进行静载验证测试。
Lndividually proof test at 2.5 times Working Load Limit.
抽检以额载的1.5倍进行20000此疲劳试验测试。
Fatiuge tested at 1.5 times Working Load Limit For 20000 cycles
每一批产品进行严格的抽样破断测试以及磁粉探伤。
Breakage test magnaflux crack detection.
底座内置定位弹簧，更方便控制D型环的任意角度。
With spring inside forbetter pivoting control
旋转吊环所采用的高强度高韧性特殊合金钢锻造精加工而成均经过调质热处理。
Forged super alloy steel-Quenched Tempered.
旋转吊环的设计安全系数为4：1
Swivels are designed with a safety factor of 4：1
旋转环测试认证时独立测试载荷应为安全工作载荷的两倍
Swivels are individually tested to 2 times the sae working load with certification
旋转环表面镀锌或涂塑，使产品能够具有抗腐蚀较好性能和寿命。
Swivels are zinc plated for corrosion resistane and longer life.
旋转环设置有黄油嘴方便于进行维护保养，使产品具有更好的性能。
Swivels are manufactured with grease fittings for superior performance.