Product Search › 1/4 - 28 UNF HTP2528 Image 1 of 1 1/4 - 28 UNF HTP2528 $160.00 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.