INTERSTATE-MCBEE M-3900630 HEXAGON FLANGE HEAD CAP SCREW 89–18 5.9L/6.7L CUMMINS (AFTERMARKET REPLACEMENT)

Product Description

Interstate-McBee M-3900630 Hexagon Flange Head Cap Screw — 1989–2018 5.9L / 6.7L Cummins

OE-style hex flange bolt used in various factory locations on 5.9L and 6.7L Cummins B-Series engines where Cummins ref. 3900630 is specified. Built to OE form, fit, and function. Sold individually.

• Direct replacement: Matches OE spec for thread pitch and flange style for reliable service.
• Consistent fitment: For B-Series applications that call for Cummins 3900630.
• Service friendly: Flanged head distributes load—no separate washer needed in most locations.
• Value: Interstate-McBee quality at an aftermarket price.

Specifications

What’s Included

• (1) Hex flange head cap screw, P/N M-3900630

Vehicle/Engine Fitment

Always verify by engine serial number (ESN) and service manual call-outs.

• Cummins B-Series 5.9L (1989–2007)
• Cummins B-Series 6.7L (2007.5–2018)
• Other applications where Cummins 3900630 is specified

Install Notes

• Identify the installation location via the Cummins service manual (fastener lengths and torque vary by location).
• Inspect mating threads; clean and chase if needed.
• Use the correct torque spec and thread treatment (oil/loctite) as specified for the location.

Why Buy From CPP Diesel

• ESN-verified fitment support from diesel specialists
• Fast shipping, easy returns, competitive pricing
• Deep inventory of complementary B-Series hardware and engine parts

FAQ

• Is this the correct bolt for my location? Check your Cummins parts catalog or service manual for fastener 3900630. If listed, this is the correct replacement.
• What torque should I use? Torque depends on the specific location and thread size. Always follow the Cummins spec for your application.
• Do I need a washer? This is a flanged head bolt; most locations do not require a separate washer unless the manual specifies one.