4mm-17mm Hex Socket Wrench Metric Allen Socket Hex Bit 1/2" Drive Size Optional
4mm-17mm Hex Socket Wrench Metric Allen Socket Hex Bit 1/2" Drive Size Optional
4mm-17mm Hex Socket Wrench Metric Allen Socket Hex Bit 1/2" Drive Size Optional
4mm-17mm Hex Socket Wrench Metric Allen Socket Hex Bit 1/2" Drive Size Optional
4mm-17mm Hex Socket Wrench Metric Allen Socket Hex Bit 1/2" Drive Size Optional
4mm-17mm Hex Socket Wrench Metric Allen Socket Hex Bit 1/2" Drive Size Optional
4mm-17mm Hex Socket Wrench Metric Allen Socket Hex Bit 1/2" Drive Size Optional
4mm-17mm Hex Socket Wrench Metric Allen Socket Hex Bit 1/2" Drive Size Optional
4mm-17mm Hex Socket Wrench Metric Allen Socket Hex Bit 1/2" Drive Size Optional
4mm-17mm Hex Socket Wrench Metric Allen Socket Hex Bit 1/2" Drive Size Optional
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4mm-17mm Hex Socket Wrench Metric Allen Socket Hex Bit 1/2" Drive Size Optional

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By HomeDIYer®

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$60.83 USD
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In stock (500 units), ready to be shipped

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Description

Metric Hex Socket Wrench Set 4–17mm — Precision Allen Bit Drive for Fastening Tasks

When a standard wrench won't reach a recessed bolt head, you need a metric hex socket wrench that fits your drive and your fastener. Mechanics, equipment technicians, and serious DIYers who work on bicycles, automotive assemblies, furniture hardware, and industrial machinery all face the same problem: mismatched or incomplete Allen socket sets that slow the job down. This metric hex socket wrench set is built to close that gap.

The set consists of S2 steel hex bit sockets in metric sizes ranging from 4mm to 17mm (~5/32" to ~43/64"), designed for use with a 1/2" square drive ratchet or breaker bar. Two shaft lengths are available — 55mm (~2.2") and 100mm (~3.9") — to handle both shallow and deep-access fastening situations. Individual sizes (H4 through H17) and multi-piece sets (8-piece H4–H14 or H4–H17) are offered in packs of 1, 2, or 5 pieces.

Typical use cases include tightening socket head cap screws on bicycle cranks and stems, driving Allen bolts on engine components and gearboxes, assembling flat-pack furniture with recessed hex fasteners, and servicing industrial equipment where standard hex keys lack the torque leverage of a drive-tool setup. The 1/2" drive interface makes this set compatible with most professional and prosumer ratchet sets already in your toolbox.

🔧 Drive Compatibility: Fits standard 1/2" square drive ratchets, breaker bars, and torque wrenches. Metric sizing — not compatible with SAE/imperial hex fasteners.

✅ Key Features of These Metric Hex Socket Wrenches

  • 🔩Wide Size Range: Covers H4 through H17 (4mm–17mm), addressing the most common metric Allen bolt sizes found in automotive, bicycle, and machinery applications.
  • 📏Two Shaft Lengths: Choose 55mm (~2.2") for compact access or 100mm (~3.9") for deeper recesses and greater torque leverage — both available across the size range.
  • ⚙️1/2" Drive Interface: Standard square drive shank integrates directly with 1/2" ratchets, extensions, and torque wrenches for controlled, repeatable fastening.
  • 🛡️S2 Steel Construction: Manufactured from S2 tool steel, which offers higher hardness and impact resistance compared to standard chrome vanadium, reducing tip rounding under load.
  • 📦Flexible Pack Options: Available as single pieces, 2-piece, 5-piece, or complete 8-piece sets — buy exactly what you need for a repair or stock up for a full workshop kit.
  • 🎯Precision Hex Profile: Machined hex tip geometry maintains close tolerance fit with socket head cap screws, reducing cam-out and fastener damage during high-torque applications.

📐 Technical Specifications — Metric Hex Socket Wrench Set

Drive Size 1/2" (12.7mm) square drive
Size Range 4mm – 17mm (H4 to H17)
Available Shaft Lengths 55mm (~2.2") / 100mm (~3.9")
Material S2 tool steel
Finish See variant options
Fastener Compatibility Metric socket head cap screws (Allen/hex bolts)
Pack Options 1 PCS / 2 PCS / 5 PCS / 8-piece set
Set Configurations H4–H14 (8 PCS), H4–H17 (8 PCS), individual sizes H4–H17
Weight (per piece) See variant options

❓ Frequently Asked Questions

Which size should I choose for bicycle crank bolts and stem bolts?

Most bicycle crank bolts use an 8mm Allen socket (H8), while stem bolts and handlebar clamps typically use 4mm, 5mm, or 6mm (H4, H5, H6). If you work on multiple bike components, the 8-piece H4–H14 set covers the full range you are likely to encounter without buying individual pieces.

What is the difference between the 55mm and 100mm shaft lengths?

The 55mm (~2.2") shaft is suited for fasteners in open or shallow locations where clearance is not an issue. The 100mm (~3.9") shaft provides additional reach into recessed bolt pockets and also increases the moment arm slightly, which can be useful when breaking loose tight fasteners before switching to a torque wrench for final tightening.

Is S2 steel stronger than chrome vanadium (Cr-V) for hex sockets?

S2 tool steel is generally harder and more impact-resistant than standard chrome vanadium alloy, making it a common choice for hex bit sockets that experience direct impact or high torque. Cr-V is well-suited for hand tools under moderate load, but S2 is preferred when using a ratchet or impact driver at higher torque values, as it resists tip deformation more effectively.

Will these sockets work with my existing 1/2" drive ratchet and extensions?

Yes. The shank is machined to the standard 1/2" (12.7mm) square drive specification, so it is compatible with any 1/2" drive ratchet, breaker bar, torque wrench, or extension bar that follows the standard square drive interface. They are not compatible with 3/8" or 1/4" drive tools without an adapter.

Can I use these with an impact wrench or impact driver?

S2 steel hex bit sockets are more impact-tolerant than standard hand-tool alloys, but these are not rated as dedicated impact sockets. For occasional low-torque impact use they may perform adequately, but for sustained high-torque impact applications, sockets specifically rated for impact use (typically black phosphate finish, thicker walls) are the appropriate choice. Contact us to confirm suitability for your specific application.

How do I choose between buying individual pieces versus the 8-piece set?

If you need one or two specific sizes for a defined repair job, individual pieces (1 PCS or 2 PCS packs) are the cost-effective option. If you maintain a variety of equipment with different fastener sizes, the 8-piece H4–H14 or H4–H17 set provides full coverage and is more economical per piece. The H4–H17 set adds H16 and H17 for larger fasteners found on heavy machinery and automotive suspension components.

Are these sockets corrosion-resistant for outdoor or wet-environment use?

S2 steel is not inherently stainless. For outdoor storage or use in humid environments, wipe the sockets with a light machine oil after use to prevent surface oxidation. The surface finish (see variant options) may provide additional protection. For marine or continuously wet environments, stainless steel hex keys are a more appropriate long-term choice.

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