【#】Features: anti-rust, hardness, corrosion-resistance. Thread pitch: 20TPI; [#]Full Coarse Thread; [#]Material: 304 Stainless Steel; [#]Features: anti-rust, hardness, corrosion-resistance. Have one to... The disadvantage is that the fastening force is lower than the outer hexagon, and the repeated use of the inner hexagon is easy to damage. Buy Binifimux Products Online at Best Prices in Australia | Ubuy 304 Stainless Steel Screws M10 X 20 Socket Countersunk Screws, Stainless Steel A2 (304), DIN 1/4-20 Socket Cap Screws 【#】Applicance: Machine assembly, furniture, table, outside; Coarse Thread pitch: 20TPI; [#]Full Coarse Thread; [#]Material: 304 Stainless Steel;. [#]Name: 1/4-20*1-1/2" Rivet Connector Bolts 【#】Package: 10pcs 1/4-20*1-1/2 Allen Head Screws; 【#】Name: 1/4-20*1-1/2 Rivet Connector Bolts;