Identify CURT Adjustable Channel Couplers & Mounting Hardware
When the identification plate is missing from a channel-mount trailer coupler, the hitch-ball socket, latch shape and mounting-channel dimensions help distinguish the replacement. The CURT 25319, 25328 and 25330 use a two-bolt adjustable channel connection, but have different rated capacities and, in one case, a different ball diameter. The separate steel channel and bolt kit need identification too.
Identify the channel coupler by model number
| 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 |
25319 is a 2-inch-ball sleeve-lock model rated 7,000 lb GTW. 25328 and 25330 are both 2 5⁄16-inch Easy-Lock couplers, rated 15,000 and 14,000 lb GTW respectively. All three use a two-bolt mounting method into a suitable adjustable channel, so the similar mounting pattern alone cannot identify the exact coupler.
Recognize channel 48610
CURT 48610 is the three-position, black steel mounting channel with a 3-inch inside opening and 2-inch coupler-bolt spacing. Its overall height is 7½ inches. This component is mounted to the trailer tongue and supports the separate coupler at a chosen height. It is not a complete coupler-and-channel assembly.
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.
Recognize the 25389 fastening kit
The manufacturer identifies 25389 as the fastener set for compatible channel-mount couplers: two Grade 8 ⅝ × 4¾-inch bolts, two ⅝-inch locknuts and four washers. The channel and coupler are separate purchases; do not substitute an unknown kit merely because its bolts appear similar.
Replacement identification checklist
- Read any stamped MPN. A five-digit manufacturer number is more reliable than the shape or black coating of the coupler.
- Measure the ball socket. 25319 is for a 2-inch ball. The 25328 and 25330 are for a 2 5⁄16-inch ball; that difference is essential.
- Identify the latch type. 25319 uses Sleeve-Lock; the two other models use Easy-Lock. Confirm operation and inspect for cracks or wear.
- Inspect the channel itself. The 48610 has a 3-inch inside width and three adjustment positions. Check damaged mounting holes, welds, frame attachment and corrosion before reuse.
- Check the bolt set. Verify both Grade 8 channel bolts, locking nuts and washers; damaged or unknown hardware should not be reused.
- Compare all ratings. The 48610 channel has a 12,000 lb GTW rating, so a higher-rated coupler cannot increase the complete assembly's permitted load. Follow the manufacturer's mounting and inspection instructions.
Compare exact part numbers and catalog photographs
The five UsedRVParts listings below are marked Brand New. Review current stock, condition and included hardware on each product page. Viewing and pickup in Kelowna applies only to eligible items and is by appointment.
CURT 48610 adjustable mounting channel
3-inch inside width · 3 height positions · 12,000 lb channel GTW
Review matching listing
CURT 25389 channel-coupler hardware kit
Two Grade 8 bolts, two locknuts, four washers
Review matching listingRelated trailer coupler references
If the original part is a straight-channel or A-frame coupler, or the missing piece is a safety pin, see our CURT Posi-Lock coupler identification, CURT coupler pin identification and Husky coupler identification.
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