From NASA: Artemis II Vehicle Manager Branelle Rodriguez Gets Orion OL60IMP 60OF 673 HL60 4 Pack Universal Fit 4#60 Roller Chain Offset Links. Pack of 4 Aftermarket Replacement #60 Roller Chain Offset Links Universal Fit This pack of four #60 roller chain offset links (also known as #60 half links) is used to adjust chain length, add links into a strand, or make quick field repairs to ANSI #60 single strand roller chain. Manufactured to ANSI B29. 1 standards, these import grade offset links are a dependable, cost effective solution for agricultural equipment, conveyors, and other machinery running standard #60 roller chain. Specifications ANSI Chain Number: #60 Pitch: 3 4 in (19. 05 mm) Roller Diameter: 0. 469 in (11. 91 mm) Width Between Inner Plates: 0. 495 in (12. 57 mm) Pin Diameter: 0. 234 in (5. 94 mm) Inner Plate Depth: 0. 708 in (18. 00 mm) Plate Thickness: 0. 095 in (2. 42 mm) Material: Carbon Steel Standard: ANSI B29. 1 Quantity: Pack of 4 Compatible With Universal Fit: Fits any standard ANSI #60 single strand roller chain application including agricultural equipment (combines, conveyors, planters, grain augers), construction equipment, and general industrial machinery using #60 chain. Replaces Part Number(s): OL60IMP, 60OF, 673 HL60, RCC50 0007 New aftermarket replacement part not remanufactured, not used.