--- product_id: 1911843 title: "Stanley Proto J5100 3/8\" Drive SAE Torque Adapter Set, 12 Point, 9PC" brand: "proto" price: "€ 271.97" currency: EUR in_stock: true category: "Proto" url: https://www.desertcart.pt/products/1911843-stanley-proto-j5100-3-8-drive-sae-torque-adapter-set store_origin: PT region: Portugal --- # 2-inch adapter measurement for perfect torque calibration Heat-treated alloy steel for max durability 12-point fine indexing for precision Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set, 12 Point, 9PC **Brand:** proto **Price:** € 271.97 **Availability:** ✅ In Stock ## Summary > ⚙️ Torque Like a Pro, Calibrate with Confidence! ## 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?** € 271.97 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/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 - • **Optimized Access:** Engineered box end wall thickness balances strength with the clearance needed to tackle hard-to-reach fasteners. - • **Made in the USA Quality:** Trust in Stanley Proto’s heritage of precision and durability, proudly manufactured stateside for unmatched performance. - • **Versatile Compatibility:** Fits 4, 6, and 12 point fasteners, making it your go-to adapter set for diverse torque calibration tasks. - • **Precision Torque Mastery:** 12-point box end design enables fine indexing, speeding up your workflow and reaching tricky fasteners effortlessly. - • **Built to Last, Built for Pros:** Crafted from heat-treated alloy steel, this set withstands heavy use without compromising strength or reliability. ## Overview The Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set is a 9-piece, 12-point socket adapter collection designed for precise torque calibration. Featuring heat-treated alloy steel for enhanced durability and a 2-inch measurement from drive center to adapter opening, it offers fine indexing and optimized access to various fasteners. Made in the USA, this set is engineered for professional-grade strength 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. ## 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 | | Best Sellers Rank | #362,051 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #594 in Torque Wrenches | | Bit Compatibilities | 1/2, 1/4, 3/8 | | Brand Name | Proto | | Customer Reviews | 4.7 4.7 out of 5 stars (299) | | Drive Bit Shank Style | Square | | Drive System | Square | | Finish Types | Brushed | | Global Trade Identification Number | 00662679230937 | | Included Components | 9 Piece 3/8" Drive Torque Adapter Set - 12 Point | | Item Length | 7.88 inches | | Item Type Name | 9 Piece 3/8" Drive Torque Adapter Set - 12 Point | | Item Weight | 1.3 pounds | | Manufacturer | Stanley Proto | | Manufacturer Part Number | J5100 | | Material Type | Blend | | Model Number | J5100 | | Number of Items | 1 | | Number of Pieces | 9 | | UPC | 662679230937 | | Unit Count | 1 Count | ## 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/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 ## Frequently Bought Together - Stanley Proto J5100 3/8" Drive SAE Torque Adapter Set, 12 Point, 9PC - Stanley Proto J000AA 25 Blade Master Feeler ga Set - Proto 1/4" Drive 5 Piece Universal Socket Set - 12 Point --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/1911843-stanley-proto-j5100-3-8-drive-sae-torque-adapter-set](https://www.desertcart.pt/products/1911843-stanley-proto-j5100-3-8-drive-sae-torque-adapter-set) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-09-27*