Yato Socket Set 173 pcs 1/4″ + 3/8″ + 1/2″ AS-Drive

The Yato Socket Set 173 pcs is a comprehensive mechanic's socket set, including tools with 1/4″, 3/8″, and 1/2″ drives. The sockets are made from durable CrV 50BV3 chrome vanadium steel by drop forging and are calibrated with precision gauges before the hardening process. The design is optimized to withstand high stress and maintain tight tolerances during long-term use.

The sockets utilize an AS-Drive profile, which directs torque to the fastener's side surfaces instead of the corners. This mechanical solution increases the maximum torque by 25% compared to standard profiles. At the same time, it prevents the rounding of nut and bolt edges during demanding removal tasks.

The bits and screwdriver bits included in the set are made from hard S2 tool steel, which has exceptionally high tensile strength and fracture resistance. The surfaces of the tools are finished with a two-tone coating that improves the corrosion resistance of the parts in humid working environments.

The three ratchets included in the set are equipped with a 72-tooth (72T) mechanism. The dense gearing provides a return angle of only 5 degrees. This specification is critical for usability in installation sites where working space is physically restricted.

Intended Use and Suitability:

The socket set is designed for technical environments requiring versatile fastener type management and standardized drive sizes.

• Vehicle Maintenance: Installation and removal of engine components, chassis parts, and braking systems, especially utilizing E-Torx and hex sockets.
• Industrial Maintenance: Mechanical upkeep of production machinery and conveyors, where the 72T ratchet mechanism allows for efficient work in confined machine spaces.
• HVAC and Electrical Installations: Use of versatile bits and articulated extension bars for tightening fasteners in piping and equipment enclosures.

Package Contents:

The set includes a total of 173 pieces packed in a plastic case:

• 1/2″ parts: 6-point sockets 10-32 mm, deep 6-point sockets 16-22 mm, E-Torx E18-E24, spark plug sockets 16/21 mm, 72T ratchet, extension bars, universal joint, T-handle.
• 3/8″ parts: 6-point sockets 10-19 mm, deep 6-point sockets 10-15 mm, E-Torx E10-E16, spark plug socket 18 mm, 72T ratchet, extension bar, universal joint, adapter.
• 1/4″ parts: 6-point sockets 4-14 mm, deep 6-point sockets 4-10 mm, E-Torx E4-E8, 72T ratchet, T-handle, screwdriver handle, extension bars, universal joint.
• 1/4″ bits and sockets: Slotted, PH, PZ, Torx, Hex.
• 5/16″ bits: Torx (TX40-TX70), Hex (7-14 mm), XZN, Ribe, Slotted, PH, PZ.
• Other: L-hex keys 1.25-5 mm.

Features:

The following structural features determine the performance of the tools:

• AS-Drive profile: Shifts the contact point from the nut's corner to its side, increasing maximum torque by 25% and preventing fastener breakage.
• 72T Ratchet Mechanism: A 72-tooth gear produces a 5-degree working angle for tight mechanical installations.
• CrV 50BV3 Material Alloy: Chrome vanadium steel ensures thin but unbreakable socket walls even under high torque loads.
• Drop Forging: The manufacturing method maintains the metal's fiber structure, which improves the fatigue strength and durability of the parts.

Technical Specifications:

• Total number of pieces: 173 pcs.
• Drive sizes: 1/4″, 3/8″, 1/2″.
• Socket material: CrV 50BV3.
• Bit material: S2 tool steel.
• Ratchet gearing: 72 teeth (72T).
• Ratchet return angle: 5 degrees.
• Torque increase (AS-Drive): + 25 %.
• Surface finish: Two-tone chrome plating.

Yato Socket Set 173 pcs User Manual:

Ensure the longevity and safety of the sockets by following correct mechanical principles during installation.

1. Select a socket that is dimensionally accurate for the fastener to be installed. Ensure it is the correct unit system (metric vs. imperial).

2. Insert the socket into the square drive of the ratchet handle so that the locking ball securely locks the socket in place.

3. Place the socket completely straight onto the bolt or nut to avoid the risk of breakage due to angled tightening.

4. Apply torque evenly without impact. To ensure the durability of the ratchet mechanism, tightly stuck fasteners should be opened with a solid T-handle instead of an articulated ratchet.

5. Clean tools from dirt and grease after use. The ratchet mechanism should be kept free of debris and occasionally lubricated with light machine oil.

Warnings:

Exceeding the mechanical limits of the tools can lead to equipment failure.

• Hand Tool Status: Sockets and extension bars made of chrome vanadium steel must under no circumstances be used with pneumatic or electric impact wrenches. Impact force causes a risk of fragmentation in CrV steel.
• Over-torquing: Do not extend the ratchet handle with a pipe or other tool to increase torque. The internal mechanism of the wrench will break from overload.
• Electrical Work: These tools do not have VDE electrical insulation. The tools must not be used for installing live parts.

Frequently Asked Questions, FAQ:

Can sockets from the Yato YT-38931 set be used with an impact wrench?
No, they cannot. The sockets in the set are made of CrV 50BV3 steel, which is designed exclusively for continuous, steady torque. Using an impact wrench can break the socket and cause a dangerous situation. Impact wrenches require CrMo power sockets alloyed with molybdenum.

What is the technical advantage of the AS-Drive profile compared to a traditional 6-point socket?
In the AS-Drive profile, the internal corners of the socket are rounded. This shifts the torque force from the sharp corners of the nut to the flat sides, which increases torque resistance by 25% and allows even slightly rounded bolts to be opened without further damage.

What material are the bits in the set made of, and how do they differ from the sockets?
The bits are made of S2 tool steel, while the sockets are CrV 50BV3 steel. S2 is a harder and more flexible material that better withstands the point-like torsional stress encountered by small tips (such as Torx or hex) without breaking.

Recycling Instructions:

All sockets, wrenches, bits, and extension bars in the set are fully recyclable steel and should be disposed of by taking them to a metal recycling point. The tool case should be sorted according to local guidelines for hard plastic collection or energy waste. Oil residues on metal parts do not prevent steel from being recycled by smelting.