Spring Inside Calipers — IMPA 650171-650176

Spring inside calipers in the IMPA 650171-650176 range are used by engine room and deck maintenance crews on cargo ships, container vessels, tankers, and offshore support vessels for accurate internal measurement of nuts, threaded bores, and recesses. The specially shaped contact tips reach inside internal threads and narrow openings where standard calipers cannot, helping engineers verify wear, confirm thread condition, and size replacement fasteners during overhauls and routine machinery checks.

This catalogue page covers the full series of 6 individually ordered items, IMPA 650171 through 650176. Each code is available separately and priced individually, so purchasing officers and chief engineers can order exactly the size they need against the vessel's IMPA requisition list. The spring-steel construction gives reliable tension and repeatable readings, while the hardened contact points resist corrosion and maintain accuracy in the humid, salt-laden atmosphere typical of engine rooms and deck workshops.

ALL-K MARINE Ship Store is a China-based wholesale and retail supplier of IMPA-coded marine stores and ship supplies. We stock the full IMPA range and provide competitive wholesale and retail pricing, with supplier QC inspection on every order. Send your IMPA-coded enquiry and receive a quotation within 24 hours. We ship worldwide through freight forwarders, and on request can arrange delivery to your local ship agent for onward supply to the vessel.