Lovejoy D4B Universal Joint 303 Stainless Steel 3/8 In Round Bore No Kw Ss.
Lovejoy 68514431161 D4B Universal Joint, Stainless Steel 303, 3/8″ Round Bore and 3/8″ Round Bore, No Keyway, No Setscrew, 0.75″ Outer Diameter, 2.68″ Overall Length.
Dimensional Data.
Lovejoy D4B universal joint machined from 303 stainless steel for corrosion resistance in washdown, marine, or food-grade environments where standard steel joints would rust.
Most U-joints fail from corrosion before they fail from wear when used in wet, washdown, or outdoor-exposed equipment. The Lovejoy D4B in 303 stainless solves that by using corrosion-resistant material throughout, making it a direct upgrade path for any application currently cycling through standard-steel joints too often.
Bore A & B | 0.380 in. |
Size | D4B. |
Size | 3/8. |
Set Screw Size | No Setscrew. |
Keyway A & B (W x D) | No Keyway. |
Outside Diameter | 0.750 in. |
Overall Length | 2.680 in. |
Bore Depth (Dimension C) | 0.880 in. |
Max. Bore (Dimensions ID1/ID2) | 0.620 in 15.00 mm. |
Main Pin Height (Dimension E) | 1.34 in. |
Cubic inches | 1.50750 in³. |
Performance Data.
Operating Temperature Range | -30 to 212 ºF. |
Max. Speed | 1750.00 rpm. |
Static Breaking Torque | 512.00 in-lb. |
Max. Angle Offset | 25.00 º. |
This Lovejoy D Type stainless steel single pin-and-block universal joint with bored hubs is designed to connect two rotating shafts at angles up to 25 degrees. This universal joint compensates for angular misalignments and has a single joint configuration for high torsional stiffness and torque capacity.
The hubs, center block, and pins are made of American Iron and Steel Institute (AISI) 303 stainless steel for corrosive environments and where sanitation requirements are a factor, and the bored hubs fit onto shafts without the need for machining. Operating temperatures range from -30 to 212 degrees F.
For optimal wear and extended life, boots (sold separately) are recommended, and boot retaining grooves are standard on this design. This universal joint provides a uniform speed ratio between driving and driven shafts, and is suitable for applications requiring moderate torque transmission, such as compressors, fans, machine tools, printing presses, and textile machinery.
Lovejoy D4B Universal Joint 303 Stainless Steel 3/8 In Round Bore No Kw Ss.
Who This Fits
Equipment operators in food processing, marine, or outdoor/washdown environments where standard-steel U-joints corrode and fail prematurely. Also a fit for anyone standardizing a fleet or line on stainless components to cut replacement frequency.
What to Check Before Buying
Confirm the D4B’s bore and pin dimensions match your existing double-universal-joint assembly — this stainless version follows the same D4B footprint as Lovejoy’s standard-steel line, so it should be a drop-in replacement, but always verify against the worn part first.
Lovejoy, a Timken company, has manufactured couplings and universal joints for industrial power transmission since 1907, and its components are used worldwide across agricultural, industrial, and heavy-duty driveline applications.
See more options in our Industrial Power Transmission Couplings guide.
