---
product_id: 1911843
title: "Stanley Proto J5100 3/8\" Drive SAE Torque Adapter Set, 12 Point, 9PC"
brand: "proto"
price: "KSh55763"
currency: KES
in_stock: true
reviews_count: 13
category: "Proto"
url: https://www.desertcart.co.ke/products/1911843-stanley-proto-j5100-3-8-drive-sae-torque-adapter-set
store_origin: KE
region: Kenya
---

# 2-inch adapter measurement for exact torque 12-point fine indexing for precision Heat-treated alloy steel for durability Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set, 12 Point, 9PC

**Brand:** proto
**Price:** KSh55763
**Availability:** ✅ In Stock

## Summary

> 🛠️ Elevate your toolkit with American-made precision and power!

## Quick Answers

- **What is this?** Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set, 12 Point, 9PC by proto
- **How much does it cost?** KSh55763 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.ke](https://www.desertcart.co.ke/products/1911843-stanley-proto-j5100-3-8-drive-sae-torque-adapter-set)

## Best For

- proto enthusiasts

## Why This Product

- Trusted proto brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Complete Size Range:** 9-piece set covers 3/8" to 7/8" with no skipped sizes—never compromise
- • **Unmatched Durability:** Heat-treated alloy steel built to last through heavy use
- • **Optimized Access & Speed:** 12-point box end design enables quick, fine indexing in tight spaces
- • **Precision Torque Calibration:** Engineered for flawless torque accuracy every time
- • **Versatile Fastener Compatibility:** Fits 4, 6, and 12 point fasteners seamlessly

## Overview

The Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set is a professional-grade 9-piece collection designed for precise torque calibration. Crafted from heat-treated alloy steel, it offers exceptional strength and durability. Its 12-point box end design allows fine indexing for faster access to 4, 6, and 12 point fasteners, while the 2-inch adapter measurement ensures exact torque application. Made in the USA, this set covers a comprehensive size range from 3/8" to 7/8" without skipping sizes, making it the go-to choice for serious professionals demanding reliability and versatility.

## Description

Stanley J5100 Proto 9 Piece 3/8-inch Drive Torque Adapter Set - 12 Point Designed for easy torque calibrations. Adapters measure 2-inch from the center of the square drive to the center of the adapter opening. Special heat-treated alloy steel helps to increase strength and durability. Box end wall thickness is specially engineered to provide strength while still allowing ample room for access to reach difficult fasteners. 12 point box end allows for fine indexing, helping to improve speed and access. Fits 4, 6 and 12 point fasteners. Proto 3/8" Drive 9 Piece Torque Adapter Socket Set -12 Point Includes the following items: J5112, J5114, J5116, J5118, J5120, J5122, J5124, J5126, J5128, J2599.

Review: High Quality American Tools, Highly Recommended - The Stanley Proto #J5100 torque adapter wrench set is well made and functions as intended. Proto typically provides high quality American made tools and this is no exception. The wrench openings have the lobular cut so they turn against the sides of fasteners and won't round them off. The only thing I would say is that the finish on the wrenches have minor chrome plating blemishes on the back sides, so I would rate the finish as 90% but not 98-100% that I typically receive from S-K and Snap On. However, this set is more complete than the Snap On set because they sell a five piece set from 5/16" to 9/16" for a higher price than this 9 piece set that goes from 3/8" to 7/8" with no skipping of sizes. The storage bar is very handy and is made as a 3/8" drive bar with spring balls at each end. Wrenches won't fall off but they are relatively easy to remove when you do so intentionally. I will emphasize that the chrome plating blemishes are very minor and appear on the rear of the wrenches so all markings are still legible on the front and the function is not affected at all. This is acceptable for a wrench but it would not be acceptable if I found it on an accessory that I bought for my cruiser motorcycle. I would highly recommend these torque adapter wrenches to anyone who wants a high quality American made set that includes all sizes from 3/8" to 7/8". Most vendors skip some sizes in this range, as if they know that you won't ever need those sizes. Or else they expect you to pay extra to buy the other sizes and then the storage bar might not be long enough to hold the extra sizes that you bought. You won't have those problems with this Proto set. Buy with confidence. I'm very happy with my purchase.
Review: Better or equal quality than truck brands - The ever speeding spiral to the bottom of the quality drain hasn't affected PROTO. Fit and finish exceeds todays “top brand” tools. I own hardware store brand tools from 20 years ago that make the truck stuff Of today look poorly finished. Tools picked up to get a job done at the time. Sad, my home set of tools from my time as a millwright, are nicer than most today. 20+ years in the trades, and value for the money, PROTO has few rivals. These work great doing head, and rocker work on HD touring models. Wish I didn’t need to order on line, todays stock nothing to reduce inventory system only reduces cost short term. Soon the government will need the tax money saved by not holding inventories, and they will add a new tax. Then, cost goes up to an already unhappy customer. Funny how 100 years ago every thing came from catalog, stores spread for convenience, now stores disappear, and we have E-catalogs. How inconvenient

## Features

- Designed for easy torque calibrations
- Adapters measure 2-inch from the center of the square drive to the center of the adapter opening
- Special heat-treated alloy steel helps to increase strength and durability
- Box end wall thickness is specially engineered to provide strength while still allowing ample room for access to reach difficult fasteners
- 12 point box end allows for fine indexing, helping to improve speed and access. Fits 4, 6 and 12 point fasteners, Made in USA

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001HWEAAG |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #411,341 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #591 in Torque Wrenches |
| Bit Compatibilities | 1/2, 1/4, 3/8 |
| Brand | Proto |
| Color | Multi |
| Compatible Fastener Range | 0.375 inches |
| Customer Reviews | 4.6 4.6 out of 5 stars (296) |
| Date First Available | October 8, 2008 |
| Drive Bit Shank Style | Square |
| Drive System | Square |
| Finish | Brushed |
| Finish Type | Brushed |
| Global Trade Identification Number | 00662679230937 |
| Head Style | Box End |
| Included Components | 9 Piece 3/8" Drive Torque Adapter Set - 12 Point |
| Is Discontinued By Manufacturer | No |
| Item Length | 7.88 Inches |
| Item Package Quantity | 1 |
| Item Weight | 1.29 pounds |
| Item model number | J5100 |
| Manufacturer | Stanley Proto |
| Material | Blend |
| Measurement System | inch |
| Number of Handles | 1 |
| Number of Pieces | 9 |
| Part Number | J5100 |
| Pattern | Solid |
| Power Source | hand_powered |
| Shape | Rectangular |
| Size | One Size |
| Style | Classic |
| Thickness | 1 Inches |
| UPC | 662679230937 |

## Product Details

- **Brand:** Proto
- **Finish Type:** Brushed
- **Item Length:** 7.88 Inches
- **Material:** Blend
- **Number of Pieces:** 9

## Images

![Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set, 12 Point, 9PC - Image 1](https://m.media-amazon.com/images/I/3187tRmhS-L.jpg)
![Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set, 12 Point, 9PC - Image 2](https://m.media-amazon.com/images/I/31ifi4X+E6L.jpg)
![Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set, 12 Point, 9PC - Image 3](https://m.media-amazon.com/images/I/31m73eR59IL.jpg)
![Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set, 12 Point, 9PC - Image 4](https://m.media-amazon.com/images/I/41Jhp1xsfUL.jpg)
![Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set, 12 Point, 9PC - Image 5](https://m.media-amazon.com/images/I/51G3CcS0jnL.jpg)

## Questions & Answers

**Q: What sizes does the set start at and go through**
A: The set is measured in 16ths running from 3/8" up to 7/8"

**Q: Does anyone know the torque calculation when using it with your torque wrench? Subtraction of the torque reading I'm sure.**
A: In order for Torque to be true to what you have the Torque wrench set at , the Dog Bone, or Crows Foot needs to be at a 90 degree angle to the wrench. If you have it straight out, you have to calculate the extended length from the square drive of the wrench. The formula is M1 = M2 x L1 / L2  
M1 is the torque setting of the wrench
M2 is the actual torque applied to the nut
L1 is the normal length of the wrench measured from the hand held end of the wrench to the square drive center.
L2 is the extended length of the wrench measured from the square drive to the new center of the adapter.
Keep everything at 90 degrees if you can and you get true torque. This may require removing the dog bone and repositioning without ratcheting until you get the click
Hope this helps I believe there is also an APP you can download for calculations

**Q: Is there a metric proto set?**
A: There isn't, unfortunately. Napa sells their Carlyle version in metric. Sunex makes a metric set. Also available from Matco, Snap On, Cornwell, and random no-name imports. Looks like Armstrong metric ones are discontinued.

**Q: Does anyone know where I can buy just the holder**
A: Go to snapon.com search crowfoot holder. They are like $6 and work great

## Customer Reviews

### ⭐⭐⭐⭐⭐ High Quality American Tools, Highly Recommended
*by J***T on April 21, 2015*

The Stanley Proto #J5100 torque adapter wrench set is well made and functions as intended. Proto typically provides high quality American made tools and this is no exception. The wrench openings have the lobular cut so they turn against the sides of fasteners and won't round them off. The only thing I would say is that the finish on the wrenches have minor chrome plating blemishes on the back sides, so I would rate the finish as 90% but not 98-100% that I typically receive from S-K and Snap On. However, this set is more complete than the Snap On set because they sell a five piece set from 5/16" to 9/16" for a higher price than this 9 piece set that goes from 3/8" to 7/8" with no skipping of sizes. The storage bar is very handy and is made as a 3/8" drive bar with spring balls at each end. Wrenches won't fall off but they are relatively easy to remove when you do so intentionally. I will emphasize that the chrome plating blemishes are very minor and appear on the rear of the wrenches so all markings are still legible on the front and the function is not affected at all. This is acceptable for a wrench but it would not be acceptable if I found it on an accessory that I bought for my cruiser motorcycle. I would highly recommend these torque adapter wrenches to anyone who wants a high quality American made set that includes all sizes from 3/8" to 7/8". Most vendors skip some sizes in this range, as if they know that you won't ever need those sizes. Or else they expect you to pay extra to buy the other sizes and then the storage bar might not be long enough to hold the extra sizes that you bought. You won't have those problems with this Proto set. Buy with confidence. I'm very happy with my purchase.

### ⭐⭐⭐⭐⭐ Better or equal quality than truck brands
*by R***K on September 8, 2020*

The ever speeding spiral to the bottom of the quality drain hasn't affected PROTO. Fit and finish exceeds todays “top brand” tools. I own hardware store brand tools from 20 years ago that make the truck stuff Of today look poorly finished. Tools picked up to get a job done at the time. Sad, my home set of tools from my time as a millwright, are nicer than most today. 20+ years in the trades, and value for the money, PROTO has few rivals. These work great doing head, and rocker work on HD touring models. Wish I didn’t need to order on line, todays stock nothing to reduce inventory system only reduces cost short term. Soon the government will need the tax money saved by not holding inventories, and they will add a new tax. Then, cost goes up to an already unhappy customer. Funny how 100 years ago every thing came from catalog, stores spread for convenience, now stores disappear, and we have E-catalogs. How inconvenient

### ⭐⭐⭐⭐⭐ Review
*by I***O on October 2, 2025*

Excelente juego de llaves de torque!!! Mando 3/8, para lugares de poco acceso y sobre todo se siente la calidad!

## Frequently Bought Together

- Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set, 12 Point, 9PC
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- Proto 1/4" Drive 5 Piece Universal Socket Set - 12 Point

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*Product available on Desertcart Kenya*
*Store origin: KE*
*Last updated: 2026-02-16*