# 3/8" Drive, 21 mm Metric Crowfoot Socket Wrench

**Manufacturer:** Proto  
**MPN:** `J4921MCF`

## Specifications

| Attribute | Value |
| --- | --- |
| Brand name | Proto |
| Manufacturer name | Proto |
| Manufacturer | Proto, Stanley Proto |
| CategoryId | 5303 |
| CategoryIdL1 | 10 |
| CategoryIdL2 | 10 |
| CategoryIdL3 | 4423 |
| CategoryIdL4 | 5303 |
| CategoryL1 | Tools & Machining |
| CategoryL2 | Hand Tools |
| CategoryL3 | Sockets & Ratchets |
| CategoryL4 | Crowfoot Socket Wrenches |
| DimensionUnit | inch |
| GraingerSku | 449P89 |
| Extra Product Name | 3/8" Drive, 21 mm Metric Crowfoot Socket Wrench |
| UPC | 662679979683 |
| UnitOfMeasure | EA |
| Weight | 0.18, 0.14, 0.2, 0.20, 3, 3.00 |
| WeightUnit | lbs |
| cali_prop65_orglabel | False |
| cali_prop65_whtlabel | False |
| color | Silver |
| countryOfOrigin | US |
| extendedLead | 1 |
| height | 0.6 |
| jsonUrlData | 924526ffbdad25e5923b |
| length | 2.5 |
| moq | 1 |
| MPN | J4921MCF |
| multiple | 1 |
| qtyInStock | 0 |
| qtyInStockOverride | 0 |
| qtySource | qtyInStockOverride |
| SKU | G5121203 |
| tierMinQty1 | 1 |
| tierPrice1 | 24.70 |
| url | https://www.zoro.com/proto-38-drive-21-mm-metric-crowfoot-socket-wrench-j4921mcf/i/G5121203/ |
| width | 1.8 |
| EAN | 662679979683 |
| Part Number | J4921MCF |
| Model | J4921MCF |
| Product Group | Home Improvement |
| Drive Size | 3/8" |
| Socket Sizes | 21mm |
| Overall Length | 2-3/32" |
| Head Size | 21 mm |
| Item | Crowfoot Socket Wrench |
| Head Style | Open End |
| SAE or Metric | Metric |
| Number of Pieces | 1 |
| Finish | Full Polish |
| Material | Alloy Steel, Blend |
| Standards | ASME B107.100-2010, SAE AS4984A |
| Corrosion Resistant | Yes |
| Measurement Type | Metric |
| Color | Silver, Multi |
| Standard | ASME B107.100-2010; SAE AS4984A |
| ASIN | B002FCNDVE, B00COU0MAM |
| AdultProduct | False |
| Amount | 47.94, 53.91 |

## Distributor availability

| Distributor | SKU | Price (USD) | Qty | Stock | MOQ |
| --- | --- | --- | --- | --- | --- |
| Zoro | G5121203 | 24.7 | 1 | None | 1 |
| Applied Industrial | 105852687 |  |  | None | 1 |
| bscsource.com | J4921MCF | 46.89 | 1 | None | 1 |
| grainger.ca | PRT4921MCF | 55.77093304 | 1 | None | 1 |
| National Supply Network | B332782 |  |  | None | 1 |
| sustainablesupply.com | C1295807 | 37.81 | 1 | None | 1 |
| Guardian | 71326854 | 50.49 | 1 | None | 1 |
| kscdirect.com | BLA J4921MCF |  |  | None | 1 |
| motionindustries.com | 05049452 | 47.98 | 1 | None | 1 |
| Zoro | G4969246 | 29.12 | 1 | None | 1 |
| directools.com | J4921MCF | 27.59 | 1 | None | 1 |
| Turner Supply | 267997968 |  |  | None | 1 |
| Circle C Supply | PTO03263 | 26.0 | 1 | None | 1 |
| Grainger | 449P89 |  |  | None | 1 |
| jensentools.com | 482-982 | 56.61 | 1 | None | 1 |
| National Supply Network | 71326854 | 38.22 | 1 | None | 1 |
| imsbolt.com | J4921MCF | 56.61 | 1 | None | 1 |

---
Structured data: `/python/html6/product/500/57000000/57482500/part_--J4921MCF---Proto--b4c2284204.json`  
Search API: https://www.dataalchemy.com/api/  
MCP server: https://www.dataalchemy.com/mcp