Inrock PRODUCTS / 3. DRILLING ACCESSORIES / CROSSOVER SUBS INROCK stocks the largest inventory of HDD crossover subs in the world. All subs are manufactured by INROCK by API standards including full material certification and quality assurance. Large Rig Crossover Subs (4 1/2″ IF – 6 5/8″ connections) require “neckdown” transition zones for minimum drilling strength. Non-Magnetic Orientation Subs Crossover Subs Tool Connection Saver Subs Weaper Subs API/Vermeer®/Jet Trac®/CASE®/PH6 and more. Most of our subs are always in stock and available for immediate delivery. Overnight delivery available on many not-in-stock subs. All connections are cut to strict tolerance using certified hardened and ground gauges. Machined from heat-treated 4140 alloy for superior strength and durability. INROCK® also offers Non-Magnetic orientation subs for magnetic guidance services. Sizes range from 4 1/8″ to 8″ Orientation Subs. Downloadables Brochure Products Brochure NEWS — 2020-10-20 SANDVIK BRAZIL – INROCK & HDD NEWS — 2020-10-20 SANDVIK MEXICO – INROCK & HDD NEWS — 2020-09-01 SALES AREA ANDEAN & SOUTH CONE – INROCK & HDD News About This Website Contact Us Cookies Data Privacy Legal Notice E-mail us at info@inrock.com Copyright © 2021 Inrock Drilling Systems, Inc. - All rights reserved We use cookies that make the web page easier to use. Read more I ACCEPT