Description
The Proto J4921MCF is a 21 mm open end crowfoot wrench with a 3/8 in drive. Per the manufacturer, crowfoot wrenches are used in hard-to-reach, restricted-access situations where a standard wrench or ratchet cannot reach, and this one has an Anti-Slip Design (ASD) open end.
The manufacturer states that the arched surfaces spread the contact forces over a greater area and keep the loads off the corners of the fastener, which helps prevent fastener rounding. The full polish finish is described as providing corrosion resistance and easy-to-clean surfaces, and crowfoot wrenches are typically used in lower torque applications. The page lists ASME B107.100-2010, SAE AS4984A. Sold as a single tool.
Features
- Open end crowfoot wrench for hard-to-reach, restricted-access situations, per the manufacturer
- 21 mm opening, 3/8 in drive
- Anti-Slip Design (ASD) open end
- Arched surfaces spread contact forces and keep loads off the fastener corners, helping prevent rounding, per the manufacturer
- Full polish finish for corrosion resistance and easy-to-clean surfaces, per the manufacturer
- Typically used in lower torque applications
Specifications
| Specification | Value |
|---|---|
| Model | J4921MCF |
| Quantity | 1 piece |
| Type | open end crowfoot wrench |
| Opening | 21 mm |
| Drive size | 3/8 in |
| Finish | full polish |
| Unit of measure | metric |
| Overall length | 2-3/32 in |
| Standards | ASME B107.100-2010, SAE AS4984A |
| Weight | 0.14 lb (0.064 kg) |
Part numbers
| Manufacturer part number (MPN) | Big Papa SKU |
|---|---|
| J4921MCF | BP-G-PRO-4921MCF |
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