AMEC 40BS23X1-1 4-H Sprocket

The AMEC 40BS23X1-1 4-H Sprocket is a 23-tooth, single-pitch roller chain sprocket designed for ANSI #40 chain. It is part of the 40BS23 family, a bore-to-size (BS) sprocket type that supports a standard through bore and can accommodate a keyed shaft engagement or, in some variants, setscrews for secure mounting. The 23 teeth and 1/2-inch pitch align with standard #40 roller chain geometry, and the outer diameter of this size is typically about 3.938 inches with a tooth thickness near 0.284 inches. Made from steel, the teeth are commonly non-hardened in catalog variants, suitable for mid-range power transmission applications. Bore options reported across the 40BS23 family include 1/2 inch, 1-1/8 inch, and 1-1/4 inch, enabling a range of shaft sizes while preserving the same 23-tooth geometry and overall sprocket footprint. Depending on the exact variant, configurations may include a through bore with a keyed connection or alternative mounting features to suit different drive systems, all while maintaining compatibility with standard ANSI #40 chain pitch and tooth profile.