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Hexagon Head Cap Screw 3991132 for Cummins Engine 4B3.9 6B5.9 ISBE4 QSB5.9 QSK78

Hexagon Head Cap Screw 3991132 for Cummins Engine 4B3.9 6B5.9 ISBE4 QSB5.9 QSK78

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Product Details

Hexagon Head Cap Screw 3991132 for Cummins Engine 4B3.9 6B5.9 ISBE4 QSB5.9 QSK78

Replacement Part Number: 3991132

Fit For Cummins Engine: 4B3.9, 6B5.9, ISBE4 CM850, QSB5.9 CM850, QSK78 CM2350 K126, QSK78 CM2350 K137

Product Highlights
Brand: FridayParts
Compatible Engine Brand: For CUMMINS
Engine Number: 4B3.9, 6B5.9, QSK78 CM2350 K126, ISBe4 CM850, QSB5.9 CM850, QSK78 CM2350 K137
Replacement Part Number: 3991132
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Josh Murphy
Reviewed on 23/09/2025
Simple and Reliable

It’s just a bolt, but exactly the one I needed for my Cummins. Threads are clean, finish looks good, and it went in without any fuss. Sometimes the little parts make all the difference—happy with it and giving it five stars.

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