CAP Barbell RB-48T Threaded Curl Bar
- Weight Capacity Maximum: 200 pounds
- Grip Size: 1 inch
- Grip Type: Knurled
- Material: Alloy Steel
Last refreshed Jul 5, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A basic, well-specced curl bar for anyone already on the standard 1-inch plate system, limited mainly by its short warranty window.
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ASIN: B000RNY4CAModel: RB-48TCategory: Weightlifting Bars
Overview
A solid steel curl bar with a chromed finish and threaded ends that lock standard 1-inch plates in place with star collars, giving two grip positions to isolate biceps and triceps on the same bar.
CAP positions this as a combined triceps bar and curl bar in one piece, with diamond knurling along the grip zones for a secure hold during pressdowns and curls. It ships with a 30-day manufacturer warranty, which is short compared with typical strength equipment coverage.
- Solid steel with chromed finish
- Threaded ends with star lock collars
- Two grip positions for biceps and triceps
- Fits standard 1-inch plates
Who it's for
Lifters who already own a standard 1-inch plate set and want a dedicated curl bar for arm isolation work, not anyone using Olympic 2-inch sleeve plates.
Pros and cons
- Two grip positions for biceps and triceps
- Chromed steel resists rust and wear
- Star lock collars secure plates in place
- Only a 30-day manufacturer warranty
- Fits 1-inch plates only, not Olympic sleeves
Performance notes
The chromed steel and diamond knurling are what carry the bar through repeated curls and pressdowns without the grip zone wearing smooth, and the star lock collars thread onto the ends to keep plates from sliding mid-lift.
Specifications
| Brand | CAP Barbell |
|---|---|
| Model | RB-48T |
| Dimensions & fit | |
| Weight Capacity Maximum | 200 poundslower than 74% of 58 weightlifting bars |
| Grip Size | 1 inchlower than 68% of 45 weightlifting bars |
| Construction & materials | |
| Material | Alloy Steel |
| Finish Type | Chrome |
| Included components | |
| Unit Count | 1 |
| Other details | |
| Grip Type | Knurled |
| Part Number | RB-48T |
Closest rivals on specs
Amazon Basics Olympic Curl Barbell 47 Inch- Weight Capacity Maximum 200 vs 300 pounds (-33%)
Everyday Essentials Olympic Super Curl Bar 48 Inch- Weight Capacity Maximum 200 vs 350 pounds (-43%)
Frequently asked questions
What size plates fit the CAP RB-48T curl bar?
It takes standard 1-inch plates, not Olympic 2-inch sleeves.
How many grip positions does this curl bar offer?
Two, letting you target biceps and triceps differently on the same bar.
What is the warranty on the CAP curl bar?
CAP backs it with a 30-day manufacturer warranty.