ASME B107.110-2012 — Socket Wrenches, Handles, and Attachments

🔧 ASME B107.110-2012 is one of the richest and most widely referenced consolidated standards in the ASME B107 “Hand Tools and Accessories” family. Through redesignation and consolidation, it brings seven formerly separate standards into a single document: B107.1 (Socket Wrenches, Hand, Inch Series), B107.2 (Socket Wrenches, Extensions, Adaptors, and Universal Joints, Power Drive, Inch Series), B107.5M (Hand Socket Wrenches, Metric Series), B107.10 (Handles and Attachments), B107.12 (Nutdrivers), B107.33M, and B107.34. Issued on June 7, 2013, its category-based organization fully covers both hand-driven and impact-driven systems in both inch and metric units within one document.

1. Scope and Organization 📌

The Standard uses a “general requirements + categories” structure. Chapters 1–6 state the common requirements (scope, references, classification, performance requirements, tests, and safety requirements and limitations of use); the product-specific provisions follow by category:

• Category 1 — Hand driven socket wrenches: hexagon (6/12-point), square (4/8-point), and universal sockets, with inch and metric tables.
• Category 2 — Socket wrenches, extensions, adaptors, and universal joints, power drive (impact): impact-rated products with Types I/II/VII sockets and Types IV/V/VI attachment forms.
• Category 10 — Handles and attachments for hand socket wrenches: hinged, ratchet, speeder, and sliding T handles, plus universal joints, extension bars, and adapters.
• Category 12 — Nutdrivers: conventional solid/hollow shaft, stubby, and miniature-handle types.
• Category 34 — Spark plug socket wrenches: sockets specifically for spark plugs.

2. Classification and Drive Sizes 🔩

3. Performance Requirements and Test Methods 📊

Performance requirements cover dimensions, hardness, finish, and function. The principal tests include:

• Torsional test: hand sockets are loaded with a specified torque on a standard mandrel; impact sockets are additionally evaluated for impact resistance.
• Hardness test: Rockwell hardness per ASTM E18 for sockets and cutting edges.
• Nutdriver tests: Category 12 specifies a torsional moment test and a bending moment test (Figs. 12-5, 12-6) verifying the shaft’s torsional and bending strength.
• Dimensional and fit inspection: mandrel dimensions and maximum insertion depths are tabulated to guarantee interchangeability.
• Ratchet and handle function tests: verify reversing reliability and endurance.

4. Safety Requirements and Limitations of Use 🛡️

Chapter 6 concentrates the safety requirements and limitations of use:

• Hand sockets and handles are for hand service only; impact work requires Category 2 impact-rated products.
• Never overload a ratchet handle or socket with a cheater bar.
• Use spark plug sockets only for spark plug installation/removal, not as general-purpose sockets.
• Stop using and replace tools that are worn, cracked, or distorted.

5. Engineering Practice Essentials 🛠️

• 🔍 Handbook-style selection: follow the chain “fastener type → hand/impact → drive size → length → attachment” and consult the corresponding category tables to lock the correct specification quickly.
• 🔧 Impact wall thickness: impact sockets are usually thicker than the same-size hand sockets; check the marking (usually an impact symbol) when purchasing.
• 📋 Acceptance: verify markings (size, drive, impact marking), coating and opening condition, and sample hardness and torque reports.
• 📊 Maintenance: clean and anti-rust sockets and attachments after use; lubricate universal joints and ratchets; keep spark plug socket magnets and rubber inserts intact.

From a systems standpoint, B107.110-2012 also plays the role of an “interface standard”: it presents the inch and metric systems side by side so that companies using both unit systems can convert and cross-check within a single document. It also draws a clear dividing line between the “hand-driven” and “power-driven (impact)” product families, writing the safety boundary into the body text. Whether you are defining a tool set, referencing acceptance criteria, or compiling training materials, you can directly build your content around the standard’s category table of contents, keeping the enterprise’s tool-management vocabulary consistent with the national standard.

It is also worth noting that the B107 Committee introduced the “Case” mechanism in this edition: when the industry encounters new structures or uses not yet covered by the body text, the Committee may issue a Case providing temporary alternative rules, posted on the official Committee page. When accepting new socket attachments, purchasers should check not only the body tables but also whether any current Case applies to the product, so as not to miss alternative requirements the Committee has approved.

6. Frequently Asked Questions ❓