BSW Thread gauges plug and ring BSW Whitworth thread BSW, BS-84:1956 HS5S5E0 P PM Gauge dimensions BS 919-2 Symbol MSBg MSRh MSRk Typ GO / NOGO GO NOGO Tolerance Tol medium medium medium BSW Ć d1 1”/P INDEX S3-302100 Y3-412100 Y3-422100 1/8 - 40 3,175 40 7123 3/16 - 24 4,762 24 7125 1/4 - 20 6,350 20 7127 5/16 - 18 7,938 18 7128 3/8 - 16 9,525 16 7129 7/16 - 14 11,112 14 7130 1/2 - 12 12,700 12 7131 9/16 - 12 14,288 12 7132 5/8 - 11 15,875 11 7133 6 3/4 - 107/8 - 91-8 19,05022,22525,400 10 71359713787139 1.1/8 - 7 28,575 7 7141 8 1.1/4 - 71.3/8 - 6 31,75034,925 7 714367145 1.1/2 - 6 38,100 6 7147 1.3/4 - 5 44,450 5 7151 2 - 4.1/2 50,800 4.1/2 7155 Example of order Available from stock 226 Y3-412100-7131 On request MSRh 1/2-12 BSW