6UNC
Thread pitch: 32tpi.
Allen key size: 5/64"
Head height: 0.073"
Head diameter: 0.262"
8UNC
Thread pitch: 32tpi.
Allen key size: 3/32"
Head height: 0.087"
Head diameter: 0.312"
10UNC
Thread pitch: 24tpi.
Allen key size: 1/8"
Head height: 0.101"
Head diameter: 0.361"
1/4UNC
Thread pitch: 20tpi.
Allen key size: 5/32"
Head height: 0.132"
Head diameter: 0.437"
5/16UNC
Thread pitch: 18tpi.
Allen key size: 3/16"
Head height: 0.166"
Head diameter: 0.547"
3/8UNC
Thread pitch: 16tpi.
Allen key size: 7/32"
Head height: 0.199"
Head diameter: 0.656"