CURT Channel-Mount Couplers: Ratings, 48610 Channel & Bolt Kit
CURT adjustable channel-mount couplers fasten with two bolts into a separate steel mounting channel, allowing the coupler height to be positioned for a suitable trailer tongue. Unlike a straight-tongue or A-frame coupler, the channel is a separate component. Compare the hitch-ball diameter, coupler rating, mounting channel and fastener kit before choosing a combination.
Three channel-coupler options
25319 — 2-inch Sleeve-LockSolid-neck cast-steel coupler with a sleeve-lock latch. CURT rates it to 7,000 lb gross trailer weight and 1,050 lb tongue weight.
25328 — 2 5⁄16-inch Easy-LockCarbide-black cast-steel model rated to 15,000 lb GTW and 2,250 lb TW. Its higher coupler rating does not increase a lower-rated channel's capacity.
25330 — 2 5⁄16-inch Easy-LockGloss-black alternative rated to 14,000 lb GTW and 2,100 lb TW. Check the complete part number instead of relying on the latch appearance.
CURT channel coupler rating comparison
| CURT MPN | Ball size | Latch | GTW rating | TW rating |
|---|---|---|---|---|
| 25319 | 2 in | Sleeve-Lock | 7,000 lb | 1,050 lb |
| 25328 | 2 5/16 in | Easy-Lock | 15,000 lb | 2,250 lb |
| 25330 | 2 5/16 in | Easy-Lock | 14,000 lb | 2,100 lb |
Select the 48610 mounting channel
CURT 48610 is a separate black formed-steel channel with a 3-inch inside width, a 2-inch bolt-pattern spread and three coupler-height positions. CURT lists it as compatible with 25319, 25328 and 25330. Its published overall height is 7½ inches. It is a mounting channel only—not a coupler, hitch ball or bolt kit.
Installed capacity is limited by the lowest-rated part. CURT rates channel 48610 to 12,000 lb GTW. Pairing it with a 15,000 lb 25328 or 14,000 lb 25330 does not make a 15,000 or 14,000 lb trailer assembly. The channel limits those combinations to at most 12,000 lb GTW, subject to all other components and installation requirements. Tongue-weight capacity must also be independently confirmed for the complete assembly.
Use the correct 25389 bolt kit
CURT 25389 supplies two ⅝-inch × 4¾-inch Grade 8 hex bolts, two ⅝-inch nylon-insert locknuts and four ⅝-inch flat washers. CURT specifically lists it for channel-style couplers used with 48610 and 48650. The kit does not contain the channel or coupler, and these bolts do not establish a separate trailer-load rating.
Before installing an adjustable coupler
- Match the hitch ball. The 25319 requires a 2-inch ball; 25328 and 25330 require a 2 5⁄16-inch ball. Do not interchange ball sizes.
- Check mounting-channel geometry. Verify the trailer structure, 3-inch channel inside width, bolt-hole positions and the height needed for level towing.
- Respect the lowest capacity. Review the coupler, channel, mounting hardware, trailer frame, hitch, ball and tow vehicle ratings, including the separate tongue-weight restriction.
- Check what ships in each box. The coupler, channel and 25389 fasteners are separate products. The latch safety pin is a different component from the channel mounting bolts.
- Follow the installation instructions. Secure the channel to a structurally suitable trailer tongue by the specified method, use the correct hardware and torque, and have any structural welding done by a qualified installer.
Shop the matching couplers and installation components
These exact-MPN links open NewRVParts products shipped from supplier warehouses; warehouse viewing or pickup is not available. Choose a coupler first, then confirm the channel and mounting hardware required for your installation.
CURT 48610 adjustable mounting channel
3-inch inside width · 3 height positions · 12,000 lb channel GTW
View exact product
CURT 25389 channel-coupler hardware kit
Two Grade 8 bolts, two locknuts, four washers
View exact productRelated trailer coupler references
For other mounting methods, latch hardware and ball-size choices, see our CURT straight-tongue and A-frame couplers, coupler safety-pin sizes and Husky trailer-coupler comparison.
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