# Black Oxide Double Box Wrench 3/4" x 7/8" - 12 Point

**Manufacturer:** Proto  
**MPN:** `J1139B`

The Proto J1139B features a non-reflective ProtoBlack finish, ideal for applications where non-plated products are required. Its 21 point box end allows for fine indexing, improving speed and access. The TorquePlus system is incorporated into the box ends, while a special alloy steel and heat treatment provide thin box walls for strength and durability. This wrench fits 4, 6, and 12 point fasteners, making it suitable for use on stubborn or damaged fasteners.

## Specifications

| Attribute | Value |
| --- | --- |
| Brand name | Proto |
| Manufacturer name | Proto |
| Manufacturer | Proto, Stanley Proto |
| DimensionUnit | inch |
| GraingerSku | 1AMM2 |
| Extra Product Name | Black Oxide Double Box Wrench 3/4" x 7/8" - 12 Point |
| Weight | 0.65, 0.15 |
| WeightUnit | lbs |
| Weight_Attrib | Weight |
| countryOfOrigin | United States |
| extendedLead | 26 |
| extendedQty | -2 |
| length | 13.0 |
| length_Attrib | Overall Length |
| moq | 1 |
| MPN | J1139B |
| multiple | 1 |
| qtyInStock | 0 |
| SKU | G7560743 |
| tierMinQty1 | 1 |
| tierPrice1 | 20.86 |
| url | https://www.zoro.com/proto-box-end-wrench-13-18-l-j1139b/i/G7560743/ |
| UPC | 662679090081 |
| EAN | 662679090081 |
| Part Number | J1139B |
| Model | J1139B |
| Product Group | Home Improvement |
| Item | Box End Wrench |
| Material | Alloy Steel, Blend |
| Size | 3/4" x 7/8", One Size |
| Finish | Black Oxide |
| Features | Helping to Improve Speed and Access, Fits 4, 6 and 12 Point Fasteners, Box Ends Incorporate the TorquePlus(TM) System |
| Head Type | Offset |
| Overall Length | 13 in |
| Standards | ANSI |
| Offset | 15 Degrees |
| SAE or Metric | SAE |
| Corrosion Resistant | No |
| Number of Points | 12 |
| Insulated | No |
| Head Movement | Fixed |
| Wrench Product Grouping | Wrenches |
| Box End Style | Spline |
| Wrench Head Sizes | 3/4 in, 7/8 in |
| Wrench Material | Steel |
| Wrench Shape | Straight |
| Ratcheting Configuration | Non-Ratcheting |
| Tether Capable | Standard Tool (Accessory Needed for Tethering) |
| Head Size | 3/4 in, 7/8 in |
| Single End/Double End | Double End |
| Wrench Item | Box End Wrench |
| Reversing | No |
| Tether Style | Not Tether Capable |
| Nonsparking | No |
| Box End Type | 12-Point Box End |
| Handle Type | Steel |
| Non-Magnetic | No |
| Wrench Length Style | Standard |
| Head Thickness | 17/32 in |
| Measurement Type | SAE |

## Distributor availability

| Distributor | SKU | Price (USD) | Qty | Stock | MOQ |
| --- | --- | --- | --- | --- | --- |
| Zoro | G7560743 | 20.86 | 1 | None | 1 |
| Grainger | 1AMM2 | 22.7 | 1 | 34 | 1 |
| ToolUp.com | PROTO J1139B | 25.82 | 1 | None | 1 |
| Raptor Supplies | AA8WXT | 21.3749055 | 1 | None | 1 |
| Amazon | B00018AGYG |  |  | None | 1 |
| Zoro | G7130542 | 29.77 | 1 | None | 1 |
| Applied Industrial | 105841259 |  |  | None | 1 |
| bscsource.com | J1139B |  |  | None | 1 |
| National Supply Network | B334548 |  |  | None | 1 |
| Guardian | 84975838 | 31.35 | 1 | None | 1 |
| kscdirect.com | BLA J1139B |  |  | None | 1 |
| stellarindustrial.com | PROTO 1139B |  |  | None | 1 |
| directools.com | J1139B | 17.94 | 1 | None | 1 |
| Zoro | G503966541 | 25.1 | 1 | None | 1 |

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Structured data: `/python/html6/product/500/180000000/180187500/part_--J1139B---Proto--c9bf46601a.json`  
Search API: https://www.dataalchemy.com/api/  
MCP server: https://www.dataalchemy.com/mcp