Replacement Capscrew for Cummins ® B/ISB/QSB Applications OEM Cross References: 3920781

Product Details

1 x Cylinder Head Bolt – 3920781

Fits Application: Cummins 6B /4B Engine

Details: Head Bolt M12 x 1.75 x 120 Flanged Hex Head Alloy Steel Class 12.9

OE Replacements: 040050, 3920781, 3902344, 3903940

Application & Fitment

• Engine Make: Cummins
• Engine Model / Application: B/ISB/QSB

Confirm the original part number and engine identification before ordering. Where applicable, also verify serial-number range, production year, piston style, bearing size or other configuration notes shown in the product information.

Part Numbers & Cross References

• OEM Cross Reference: 3920781
• Interstate-McBee Reference: M-3920781

Need Help Confirming Fitment?

Use the engine model, serial number and original part number when checking compatibility. For kits and sets, review the complete component breakdown above before ordering because contents can vary by engine configuration.