Irwin Vise-Grip 21 Locking C Clamp 18 Inch
- Locking C-clamp, regular tip
- Special alloy steel, classic style
- 1.09 kilograms, silver
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A long locking clamp from Irwin with a regular tip and a special alloy steel frame. Titles show two different model numbers, so check the item type before buying.
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ASIN: B00004SBBIModel: 18RCategory: Clamps
Overview
A special alloy steel frame carries the regular tip on this long locking clamp. The classic style pairs a screw adjustment with a lock, and the finish is silver.
The long frame reaches across wide work, and the steel is described as a special alloy. The listing shows two names for the product and gives no clamping force or throat depth.
Who it's for
Wide sheet, large frames and repair jobs where the work is far from the edge suit a long locking clamp. Small bench tasks are better served by a short clamp.
Pros and cons
- Long reach across wide work
- Special alloy steel frame
- Title and item type show different numbers
- Throat depth not listed
- Clamping force not stated
- Heavy to carry
Performance notes
A long frame increases leverage but also flexes more under heavy load, so clamping force depends on the frame stiffness as well as the screw. The lock holds the setting once it is made. The listing gives no figure for force.
Specifications
| Brand | Irwin |
|---|---|
| Model | 18R |
| Dimensions & fit | |
| Item dimensions | 18.12 x 7.02 x 1.52 inches |
| Item weight | 1.09 kilograms |
| Construction & materials | |
| Material Type | Special alloy steel |
| Color | Silver |
| Included components | |
| Included Components | Locking clamp, 18 inch, regular tip |
| Unit Count | 1.0 Count |
| Other details | |
| Style Name | Classic |
| Item Type Name | Locking clamp, regular tip, 18 inch |
Closest rivals on specs
COGNATIVE Mini Table Clamp Bench Vise 2"- Item Weight 2.4 vs 2.16 pounds (+11%)
Frequently asked questions
How big is the Irwin 18R?
The item type says 18 inch, and the listing gives dimensions of 18.12 x 7.02 x 1.52 inches.
Is the Irwin 18R the same as the Irwin 21?
The title says 21 while the model and item type say 18R. The item type describes an 18 inch locking clamp.
What is the Irwin 18R made of?
Special alloy steel.
How heavy is the Irwin 18R?
The listing gives 1.09 kilograms.