Lederer, a stainless steel fastener and screw nut expert, published the latest style of the company. 4 different styles are in line with French NFE 25-514 standard, produced in A2 stainless steel, size M3-M24. Z models / M models / L models / LL models can be distinguished from the difference between the inner and outer diameters, and have a minimum hardness of 150 HV according to the French standard (compared to DIN, such as DIN 125, the minimum hardness of 140HV). Some individual sizes of Z (M5, 10, 12 and 16) and LL (M16) have the same dimensions as DIN 125 (Z) and 9021 (LL). As for other styles, the difference is not big. Enter the easy-to-tight fastener network standard and supplier column to see more French washer standards View: NF E 25-514 Class A Flat Washer Standard Data Luffing Jib tower cranes are a popular choice among leading construction and rental companies worldwide. Particularly well-matched to the construction of high-rise buildings on urban jobsites, luffing jib tower cranes are designed to work together in a wide variety of configurations efficiently and safely. Luffing Jib Tower Crane,Luffing Jib,Luffing Crane,Luffing Jib Crane Jinan Shanghangda Machinery Co., Ltd. , https://www.shdtowercrane.com