Product Search › 1-5/8 - 18 UNEF 1TP1.6218 Image 1 of 1 1-5/8 - 18 UNEF 1TP1.6218 $470.00 Part identification and A, B, C, and D dimensions listed within the product selection. Dimension reference image below. Quantity: Add To Cart Added! Part identification and A, B, C, and D dimensions listed within the product selection. Dimension reference image below.