Our hex flange oil drain plugs are precision machined carbon steel fasteners, used to seal the oil drain hole on engine oil pans and gearbox sumps. The integrated flange design provides stable compression for sealing washers to prevent oil leakage. Two surface treatments are available: color zinc plating and black oxide. Multiple thread specifications fit different passenger cars, light trucks and commercial vehicle oil systems.
- Carbon steel construction for stable pressure resistance
- Integrated hex flange for even sealing compression
- Color zinc or black oxide surface options
- Matched with sealing washer for leak-proof performance
- For engine oil pan, transmission and gearbox sump
- Multiple thread sizes in stock, custom service supported
Contact us for thread specifications and bulk quotation.
FAQ
Q: What is hex flange steel oil sump drain bolt for engine used for?
A: This hex flange steel oil sump drain bolt for engine, also known as oil drain plug, is installed on the oil pan. It is removed during oil changes to release old engine oil and then reinstalled to seal the drain hole.
Q: Do I need a sealing washer when installing the drain plug?
A: Yes, a sealing washer is required between the flange and oil pan surface to avoid oil seepage. We can supply matching washers together.
Q: What surface finishes can you offer?
A: We provide color zinc plating and black oxide versions to meet different anti-corrosion and appearance requirements.
Q: Are these drain plugs universal?
A: No, they are size-specific. Thread pitch, diameter and length must match your oil pan.
Q: Can you make custom oil drain plugs?
A: Yes, we support OEM custom thread, size and packaging for bulk orders.
