Head Cap Screw 3.9 4B/4BT 5.9 6B/6BT Cummins

New Rocker Bolt 3.9 4B/4BT 5.9 6B/6BT Cummins Engines.

This is a 12mm Hexagon Flange Screw M12 x 1.75 x 180mm or 12 mm x 180 mm.

Also fits some QSB4.5 engines.

This is actually a cylinder head bolt that also holds the rocker arm down.

Scroll down for more detailed compatibility information.

Part Number: 3920781 3903940 3902344 040050

Weight: 0.5 lbs.

Price: $3.00

Short Product Description:

39208781 Screw

Quantity to Add:

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Questions and Answers:

Q: Do you have to replace Cummins head bolts every time?	8/8/2024
A: No, Cummins has an allowable stretch spec. As long as you are within that, you can reuse the old bolt. Some people choose to always replace them, though.

3920781 Screw, Hex Flange Head Cap Quantity: 6 Remarks: Ref No : 11 3904679 Engine Year: 1988 BT5.9 160 CPL:804 Sample ESN: 44243058

3920781 Screw, Hex Flange Head Cap Quantity: 6 Remarks: Ref No : 11 3923262 Engine Year: 1996 B5.9 (215) CPL:2175 Sample ESN: 56326974

3920781 Screw, Hex Flange Head Cap Quantity: 4 Remarks: Ref No : 11 3904679 Engine Year: 1988 4BT3.9 (105) CPL:858 Sample ESN: 44258612

3920781 Screw, Hex Flange Head Cap Quantity: 4 Remarks: Ref No : 11 3904679 Engine Year: 1988 4B3.9 CPL:591 Sample ESN: 21021339

3920781 Screw, Hex Flange Head Cap Quantity: 4 Remarks: Ref No : 11 3904679 Engine Year: 1995 4BT3.9-C CPL:730 Sample ESN: 21021339

3920781 Screw, Hex Flange Head Cap Quantity: 4 Remarks: Ref No : 11 3923262 Engine Year: 1997 4B3.9 CPL:767 Sample ESN: 21021339

3920781 Screw, Hex Flange Head Cap Quantity: 4 Remarks: Ref No : 11 3284377 Engine Year: 2006 S4D102LE-2 CPL:1493 Sample ESN: 46659758

3920781 Screw, Hex Flange Head Cap Quantity: 4 Remarks: Ref No : 11 3284377 Engine Year: 2000 B3.9 130 CPL:1839 Sample ESN: 46114812

3920781 Screw, Hex Flange Head Cap Quantity: 4 Remarks: Ref No : 11 3284377 Engine Year: 2006 QSB4.5 CPL:8401 Sample ESN: 46114812

Description: 39208781 Screw

Price: $3.00