Simpson 3/8" Drop-In Internally Threaded Anchor 303 Stainless Steel DIA37SSDrop in anchors are internally threaded drop in expansion anchors for use in flush mount applications in solid base materials. Minimum thread engagement should be equal to the nominal diameter of the threaded insert Model No. DIA37SS Drop In Anchor Coating Material : Type 303 304 Stainless Steel Drill Bit Dia. (in.) : 1 2 Length (in.) : 1. 5625 Rod Dia. (in.) : 3 8 Thread Length (in.) : 5 8 TPI : 16 Component Material, Anchor Body : AISI 303. Meets