gtpartes 2-7/8" Oil Bath Axle Caps Pair (21-35) — Fits Dexter 6K–8K Drums, OEM-Style Seal

These are a matched pair of 2-7/8" oil bath axle caps (21-35) designed to replace worn or missing caps on Dexter-style 6,000–8,000 lb oil-bath drums.

If your trailer axle drum shows one of the cast numbers 8-218, 8-219, 8-232, 8-285, or 8-286, these gtpartes caps are engineered as a direct fit. Sold as a pair, they replicate the original thread size and sealing profile found on many Dexter oil-bath hubs and some older Kodiak disc brake applications. They offer a simple replacement option to keep grease and oil contained, helping preserve bearings and brake components from road grime and moisture.

How do I know this cap will fit my trailer axle?

Check your drum for the listed cast numbers (8-218, 8-219, 8-232, 8-285, 8-286) and verify the thread diameter. These caps have a 2-7/8" outside thread diameter and 12 threads per inch, which matches the K71-038-00 (21-35) specification used on many Dexter 6K–8K oil-bath drums.

• Fits drums with cast numbers 8-218, 8-219, 8-232, 8-285, 8-286
• Thread OD: 2-7/8" (approximately)
• Thread pitch: 12 threads per inch
• Also listed as part number K71-038-00 / 21-35

What trailers and axles use these oil bath caps?

These caps commonly fit 6,000 to 8,000 lb Dexter oil-bath drums—frequently found on 8,000 lb axles and some older 6,000–7,000 lb models. They're also a replacement for select older Kodiak disc brake hubs that share the same thread and sealing geometry.

• Common on 8000# Dexter oil-bath axle drums
• Compatible with many 6000# and 7000# oil-bath drums
• Suitable for certain pre-1989 9000# axle designs
• Some Kodiak disc brake applications use the same cap form

What are the features and benefits of these caps?

Each sale includes two identical oil-bath caps manufactured to match the OEM thread and seal dimensions. They keep lubricants sealed inside the hub and prevent contaminants from entering—helpful for maintaining bearing life and reliable brake operation under normal use.

• Sold as a pair for axle left and right replacement
• OEM-compatible dimensions reduce installation hassle
• Prevents oil/grease loss and blocks road contaminants
• Simple threaded installation with standard tools

Who is this for? If you maintain trailers with Dexter-style oil-bath hubs or are restoring older trailers that use the listed drum numbers, this gtpartes pair of 2-7/8" (21-35) oil bath caps is a straightforward, budget-friendly replacement. These caps suit DIYers, fleet maintenance teams, and professional mechanics who need an exact-thread replacement to reseal hub drums and protect bearings and brake internals. Confirm your drum’s cast number and thread specification before purchase to ensure proper fit.