Spiral Mill-Thread Inserts Spiral Mill-Thread Inserts ISO 60°METRIC (INTERNAL) UN 60°AMERICAN UN (UNO UNF UNEF UNS INTERNAL) P P w CD m w o SH 1/8P 1/8P Screw Screw Dimensions Dimensions Designation Pitch (mm) Thread Size I W t Designation TPI Thread Size I w t H23I 1.00 ISO 1.0 >26 27 8.0 3.5 H23I 24 UN 24 >1" 27 8.0 3.5 H23I 1.50 ISO 1.5 >27 27 8.0 3.5 H23I 20 UN 20 >1" 27 8.0 3.5 H23I 2.00 ISO 2.0 >28 27 8.0 3.5 H23I 18 UN 18 >1 1/16" 27 8.0 3.5 H23I 3.00 ISO 3.0 >30 27 8.0 3.5 H23I 16 UN 16 >1 1/16" 27 8.0 3.5 H32I 1.50 ISO 1.5 >35 32 9.0 4.0 H23I 14 UN 14 >1 1/8" 27 8.0 3.5 H32I 2.00 ISO 2.0 >36 32 9.0 4.0 H23I 12 UN 12 >1 1/8" 27 8.0 3.5 H32I 3.00 ISO 3.0 >38 32 9.0 4.0 H23I 8 UN 8 >1 3/16" 27 8.0 3.5 H32I 4.00 ISO 4.0 >40 32 9.0 4.0 H23I 7 UN 7 >1 1/4" 27 8.0 3.5 H45I 1.50 ISO 1.5 >50 37 11.9 5.0 H32I 20 UN 20 >1 3/8" 32 9.0 4.0 083 H45I 2.00 ISO 2.0 >50 37 11.9 5.0 H32I 18 UN 18 >1 3/8" 32 9.0 4.0 084 H45I 3.00 ISO 3.0 >56 37 11.9 5.0 H32I 16 UN 16 >1 3/8" 32 9.0 4.0 H45I 4.00 ISO 4.0 >56 37 11.9 5.0 H32I 12 UN 12 >1 7/16" 32 9.0 4.0 H63I 1.50 ISO 1.5 >70 38 11.9 5.0 H32I 8 UN 8 >1 1/2" 32 9.0 4.0 H63I 2.00 ISO 2.0 >70 38 11.9 5.0 H32I 6 UN 6 >1 9/16" 32 9.0 4.0 H63I 3.00 ISO 3.0 >75 38 11.9 5.0 H45I 16 UN 16 >2" 37 11.9 5.0 H63I 4.00 ISO 4.0 >75 38 11.9 5.0 H45I 12 UN 12 >2" 37 11.9 5.0 H45I 8 UN 8 >2 1/4" 37 11.9 5.0 H45I 6 UN 6 >2 1/4" 37 11.9 5.0 H63I 16 UN 16 >2 3/4" 38 11.9 5.0 H63I 12 UN 12 >2 3/4" 38 11.9 5.0 H63I 8 UN 8 >3" 38 11.9 5.0 H63I 6 UN 6 >3" 38 11.9 5.0