A-3920780-AI Bolt, Head; 12MM X 1.75MM X 120MM

One New Aftermarket Replacement Cylinder Head Bolt for Cummins B-Series Diesel Engines

This hexagon flange head cap screw (cylinder head bolt) is a critical fastener used to clamp the cylinder head and head gasket to the engine block on Cummins B-series diesel engines. Proper clamping force from these bolts maintains combustion pressure and coolant sealing integrity. Replaces Cummins OEM part number 3920780. This is the M12 x 1.75 x 120mm bolt used in head bolt kits for 4B and 6B engine families across agricultural, construction, and on-highway applications.

Specifications

• Thread Size: M12 x 1.75
• Length: 120mm
• Type: Hexagon Flange Head Cap Screw

Compatible Engines

Cummins B-Series: 4B, 4B3.9, 4BT, 6B, 6B5.9, 6BT, 6BTA5.9-G3, B5.9-C177, ISB, QSB (3.9L, 5.9L, 6.7L)

Compatible Equipment

Dodge / Ram Pickup Trucks: 2500, 3500 (1989-1998 5.9L 12V Cummins applications)

Fits Case Tractors and Loaders: 550, 621, 650, 688, 888, 1088, 1620, 1640, 1644, 1800, 1822, 1840, 1844, 1896, 2022, 2044, 2096, 2144, 2344, 3150, 3185, 3210, 4390, 4390T, 4391, 4391T, 4391TA, 40XT, 450C, 455C, 480E, 480E LL, 550E, 550G, 580E, 580K, 580SE, 60XT, 650G, 650H, 650K, 680L, 70XT, 750H, 750K, 75XT, 780C, 780D, 850D, 850E, 850G, 850H, 850K, 855D, 855E, 85XT, 880D, 90XT, 95XT, 1085B, 1085C, 1086B, 1150E, 1150G, 1150H, 1155E, 1845C, 5120, 5130, 5140, 5150, 5220, 5230, 5240, 5250, 6000, 6500, 6590, 6590T, 6590TA, 6591T, 6591TA, 8820, 8825, 8825HP, 8830, 8840, 8850, 8860, 8860HP, 8870, 8880, 8880HP, MX100, MX110, MX120, MX135, MX150, MX170, RP65, RP85, RP110, RP135, RP165, RPZ65, RPZ85, RPZ125, RPZ145, SPX3150, SPX3185, SPX3200, SPX3200B, SPX3310, W11B, W14B, W14C

Fits New Holland: U80, LV80

Replaces Part Number(s):

3920780, A-3920780-AI

Aftermarket Interchange Numbers

M3920780, SCR9341, 3901220, 3903939, 3918472, J920780, J903939

New aftermarket replacement part - not remanufactured, not used.