Product Search › 7/8 - 18 UNS 1TP8718 Image 1 of 1 7/8 - 18 UNS 1TP8718 $200.00 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.