Application technology 12 Thread tables Pipe thread, cylindrical DIN ISO 228-1 Thread G1/8 G1/4 G3/8 G1/2 G5/8 G3/4 G7/8 G1 G11⁄8 G1¼ G13⁄8 G1½ G1¾ G2 Thread Ø mm 9.728 13.157 16.662 20.955 22.911 26.441 30.201 33.249 37.897 41.910 44.323 47.803 53.746 59.614 Core Ø mm 8.566 11.445 14.950 18.631 20.587 24.117 27.877 30.291 34.939 38.852 41.365 44.845 50.788 56.656 Number of threads per 1" (=25.4 mm) 28 19 19 14 14 14 14 11 11 11 11 11 11 11 Thread G2¼ G23⁄8 G2½ G2¾ G3 G3¼ G3½ G3¾ G4 G4½ G5 G5½ G6 Thread Ø mm 65.710 69.390 75.184 81.534 87.884 93.980 100.330 106.680 113.030 125.730 138.430 151.130 163.830 Core Ø mm 62.752 66.440 72.226 78.577 84.926 91.022 97.372 103.722 110.072 122.772 135.472 148.172 160.872 Number of threads per 1" (=25.4 mm) 11 11 11 11 11 11 11 11 11 11 11 11 11 Whitworth pipe thread, conical DIN EN 10226-1 (ISO 7/1) Rp-R BS 21(BSP-BSPT) Thread R1/8 R1/4 R3/8 R1/2 R5/8 R3/4 R7/8 R1 R11⁄8 R1¼ R13⁄8 R1½ R1¾ R2 Thread Ø mm 9.728 13.157 16.662 20.955 22.911 26.441 30.201 33.249 37.897 41.910 44.323 47.803 53.746 59.614 Core Ø mm 8.566 11.445 14.950 18.631 20.587 24.117 27.877 30.291 34.939 38.852 41.365 44.845 50.788 56.656 Number of threads per 1" (=25.4 mm) 28 19 19 14 14 14 14 11 11 11 11 11 11 11 Thread R2¼ R23⁄8 R2½ R2¾ R3 R3¼ R3½ R3¾ R4 R4½ R5 R5½ R6 Thread Ø mm 65.710 69.390 75.184 81.534 87.884 93.980 100.330 106.680 113.030 125.730 138.430 151.130 163.830 Core Ø mm 62.752 66.440 72.226 78.577 84.926 91.022 97.372 103.722 110.072 122.772 135.472 148.172 160.872 Number of threads per 1" (=25.4 mm) 11 11 11 11 11 11 11 11 11 11 11 11 11 12 228 GEKA® Main Catalogue
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