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Gunnix → Gun Cleaning Accessories → Gun Cleaning Replacement Items → 8-32 to 5-40 Brass Cleaning Rod Adapter

8-32 to 5-40 Brass Cleaning Rod Adapter

8-32 to 5-40 Brass Cleaning Rod Adapter
In stock
SKU: AD-0001-005
8-32 to 5-40 Brass Cleaning Rod Adapter
8-32 to 5-40 Brass Cleaning Rod Adapter
In stock
SKU: AD-0001-005
$3.99

Available Options

5/16-27 to 8-32 Shotgun Cleaning Rod Adapter
5/16-27 to 8-32
$3.99
8-32 to 5-40 Brass Cleaning Rod Adapter
8-32 to 5-40
$3.99
2-Piece Universal Brass Cleaning Rod Adapter Set (8-32 to 5-40 & 5/16-27 to 8-32)
Rod Adapter Set
$5.99

Know before you buy:

Shipping Policy Return & Refund Policy

⚠️ WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Standard cleaning rods use 8-32 thread, but .17 and .20 caliber brushes, jags, and mops use the smaller 5-40 thread. Without this brass cleaning rod adapter, you need a separate rod just for your smallest rifles. Thread this adapter onto your existing 8-32 rod and every 5-40 accessory fits instantly - no second rod, no hunting for specialty equipment.

The .17 HMR and .17 WSM have become popular varmint and target calibers, but their cleaning accessories use the thinner 5-40 thread because the standard 8-32 is physically too large for that bore size. Most shooters discover this mismatch the day their new .17 cal brush arrives and won't screw onto their cleaning rod. This thread adapter is the fix. Solid brass construction protects both thread types from cross-threading damage and resists the solvents and oils that are part of every gun cleaning session.

Small enough to live permanently on your .17 cal brush set or tossed in the bottom of your cleaning kit. Either way, this cleaning rod adapter means your 8-32 rod handles everything from .17 caliber up - one rod for every rifle and pistol you own.


Product Type:
Thread Adapter
Material:
Brass
Item Function:
Thread Conversion
Thread Input:
8-32
Thread Output:
5-40
Number of Pieces:
1
Thread Conversion (from → to):
8-32 → 5-40
Country of Origin:
Imported (China)
Brand:
GUNNIX

When you want to use .17 or .20 caliber cleaning accessories on a standard rifle cleaning rod. Most rifle rods use 8-32 threads, but .17 and .20 caliber brushes, jags, and mops use the smaller 5-40 threads. Without this adapter, your .17 HMR brush won't attach to your .30 cal cleaning rod. One adapter gives your existing rod full .17/.20 caliber capability.

Only .17 caliber and .20 caliber cleaning accessories use 5-40 threads. Everything else - .22 caliber and up through all rifle and pistol calibers - uses 8-32 threads. Shotgun accessories use a third standard: 5/16-27. If you own a .17 HMR, .17 WSM, or .204 Ruger alongside larger-caliber rifles, this adapter is the piece that connects them to your existing cleaning rod.

Yes, solid brass. Material matters because the adapter sits between your cleaning rod and the accessory - it contacts both threaded surfaces. Brass is softer than steel, so it won't damage or cross-thread either connection. It also resists corrosion from bore solvents. Steel adapters risk galling (cold-welding) against steel rod tips, which can lock the adapter on permanently. Brass prevents this.

Yes, as long as the cable tip has standard 8-32 threads. Most flexible cleaning cables for rifles use 8-32. Thread the adapter onto the cable tip, then attach your 5-40 brush or jag. The adapter adds minimal length - about 1/2 inch - so it doesn't affect cable flexibility or performance in the bore.

No. This adapter converts thread standards (8-32 to 5-40) - it doesn't extend rod length. To connect two rod sections, you need a coupler with the same thread on both ends (e.g., 8-32 female to 8-32 female). This adapter has two different thread sizes by design: one end accepts 8-32, the other accepts 5-40.