Kind of folding editor hex screws, machine screws, wood screws 304 in this paragraph; but according to different uses can be divided into many categories; Screws hexagonal screw machine within Heze 304, can be divided into longitudinal and transverse expansion screw fastening screws; can also be divided according to thread: A: triangular thread (60 degrees): binding / lock / expansion B: Triangle Pipe thread (55 degrees): binding / lock 3) C: trapezoidal thread (30 or 29 degrees): Power Drive D: square thread (90): In the power transmission Yantai 304 stainless steel hex screws hexagonal screws, stainless steel screws 304, 316 stainless steel screws, stainless steel combination screws, stainless steel blind rivets, screws 316 stainless steel flange screws c Phil-Slot. : word / Phillips d Hex Socket: Hexagon e One Way:. unidirectional (may only be locked in, not exit) A-4: Head Code / head shape .a Flat:. flat head (after the lock-in, top flush with the work piece) b Oval:. salad head, O head, countersunk head c Round:. Round d Pan:. round flat head stainless steel nuts. 316L screw SHCS Linyi 304, 316 L screws, bolts 316 e Truss:. Great circle flat head, stainless steel screws, stainless steel screws, f Hex:. Hex head .A-5: Finish Code / exterior treatment metric self-tapping screws: to name behind the label direct Tapping Type.Ex: M3 x 6 -PPB, Tapping Type: M3 self-tapping screws, 6mm long, cross, round flat head, black-plated products generally do not or label, then judge for the Sheet Metal or plastic. Parts use. *** teeth as the number of threads per inch. *** Jinan Road ground (FIG), Jining 304 hexagonal screws, socket head cap screws 304 provided by Jinan Daoqin Trading Company. Jinan Daoqin Trading Company (www.daoqinshangmao.com) (www.daoqinshangmao.com) located in Jinan City flyover District, Huang Huang Road on the 1st District 730 Taiwan stainless steel market 7 rooms. Scraps and development in the wave of market economy, Jinan Road ground has a high profile in hardware accessories, enjoys a good reputation. Jinan Road ground made the whole network business alliance certification, marking our service and management level has reached a new height. Jinan Road ground staff willing to work with all people of insight and common development, for a better future.