M2.5 M3 Hex Socket Shoulder Screws — Step Positioning Bolts, Grade 12.9 - HomeDIYer
M2.5 M3 Hex Socket Shoulder Screws — Step Positioning Bolts, Grade 12.9 - HomeDIYer
M2.5 M3 Hex Socket Shoulder Screws — Step Positioning Bolts, Grade 12.9 - HomeDIYer
M2.5 M3 Hex Socket Shoulder Screws — Step Positioning Bolts, Grade 12.9 - HomeDIYer
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M2.5 M3 Hex Socket Shoulder Screws — Step Positioning Bolts, Grade 12.9 - HomeDIYerM2.5 M3 Hex Socket Shoulder Screws — Step Positioning Bolts, Grade 12.9 - HomeDIYerM2.5 M3 Hex Socket Shoulder Screws — Step Positioning Bolts, Grade 12.9 - HomeDIYerM2.5 M3 Hex Socket Shoulder Screws — Step Positioning Bolts, Grade 12.9 - HomeDIYer

M2.5 M3 Hex Socket Shoulder Screws — Step Positioning Bolts, Grade 12.9

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Beschreibung

M2.5 M3 Hex Socket Shoulder Screws — Precision Step Positioning Bolts for Tight-Tolerance Assemblies

When a standard cap screw just won't do the job — when you need a fastener that also acts as a precision locating pin, pivot point, or guide shaft — a shoulder screw is the right tool. Makers, engineers, and hobbyists working on robotics, 3D printers, RC vehicles, jigs, and small mechanical assemblies rely on hex socket shoulder screws to hold parts in exact alignment without play or wobble.

Each screw features a precisely machined shoulder (step) section between the head and the threaded portion, allowing it to serve as both a fastener and a locating element. These step positioning bolts are manufactured from Grade 12.9 alloy steel — one of the highest strength classes for metric fasteners — and feature a standard hex socket (Allen) drive head. Available in M2.5 and M3 thread diameters, with shoulder lengths ranging from 4 mm (≈5/32") to 10 mm (≈3/8"), and sold in pack quantities of 2 to 50 pieces to suit both prototyping and production runs.

Typical use cases include: positioning pivot pins in 3D printer extruder assemblies, locating dowel replacements in CNC jigs and fixtures, guide shafts for small sliding mechanisms in robotics, and shoulder bolts for RC car suspension linkages. These M2.5 M3 hex socket shoulder screws are a go-to solution wherever a step positioning bolt with precise diameter control is required.

🔩 Thread Compatibility: ISO metric M2.5 & M3 threads — fits standard metric tapped holes, threaded inserts, and hex nuts per ISO 68-1. Not compatible with UNC/UNF inch-standard threads.

✅ Key Features of These M2.5 M3 Hex Socket Shoulder Screws

  • 💪 Grade 12.9 Alloy Steel Strength — Manufactured to Grade 12.9 specification with a tensile strength typically around 1220 MPa, making these step positioning bolts suitable for high-load precision assemblies where standard fasteners would fail.
  • 🎯 Precision-Machined Shoulder for Accurate Positioning — The stepped shoulder diameter is held to tight tolerances, allowing these screws to function as locating pins and pivot shafts in jigs, fixtures, and mechanical linkages without requiring a separate dowel pin.
  • 🔧 Hex Socket (Allen) Drive Head — The recessed hex socket drive allows installation in confined spaces where a standard hex head wrench cannot reach, making these socket head shoulder bolts ideal for compact assemblies like 3D printer frames and RC suspension components.
  • 📐 Multiple Sizes in One Listing — Choose from M2.5 (4/5/6/8/10 mm shoulder length) or M3 (4/5/6/8 mm shoulder length) to match your exact design requirement, eliminating the need to source from multiple suppliers.
  • 📦 Flexible Pack Quantities — Available in packs of 2, 5, 10, 20, 30, or 50 pieces, so you can order just enough for a prototype or stock up for a production run without overpaying for bulk minimums.
  • ⚡ Ships Fast from US Warehouse — Stocked and fulfilled domestically, so you get your hex socket shoulder screws quickly without waiting weeks for overseas shipping — keeping your project on schedule.

📐 Technical Specifications — M2.5 M3 Step Positioning Shoulder Screws

Thread Diameter M2.5 / M3
Thread Standard ISO Metric (ISO 68-1)
Shoulder (Step) Lengths — M2.5 4 mm (≈5/32"), 5 mm (≈3/16"), 6 mm (≈1/4"), 8 mm (≈5/16"), 10 mm (≈3/8")
Shoulder (Step) Lengths — M3 4 mm (≈5/32"), 5 mm (≈3/16"), 6 mm (≈1/4"), 8 mm (≈5/16")
Head Type Hex Socket Cap (Allen Drive)
Drive Size — M2.5 Typically 2 mm hex key
Drive Size — M3 Typically 2.5 mm hex key
Material Grade 12.9 Alloy Steel
Tensile Strength Typically ≈1220 MPa (≈177,000 psi)
Surface Finish See variant options
Pack Quantities Available 2 / 5 / 10 / 20 / 30 / 50 pcs
Country of Origin Contact us to confirm
⚠️ Heads up: Shoulder diameter and exact thread length vary by size. If your application requires specific shoulder diameter tolerances, please contact us to confirm before ordering.

❓ Frequently Asked Questions

How do I choose the right shoulder length for my application?

The shoulder length should match the thickness of the part you need to locate or pivot. For example, if you are positioning a 5 mm thick plate, choose the 5 mm shoulder length. Generally, the shoulder should be equal to or slightly shorter than the mating bore depth. Available lengths in this listing range from 4 mm (≈5/32") to 10 mm (≈3/8"). When in doubt, go slightly shorter — you can always add a washer to take up slack.

What grade is the steel, and how strong are these shoulder screws?

These screws are Grade 12.9 alloy steel, which is one of the highest strength classes for metric fasteners. Grade 12.9 typically has a tensile strength of approximately 1220 MPa (≈177,000 psi) and a proof load of around 1100 MPa. They are significantly stronger than standard Grade 8.8 or 10.9 fasteners, making them suitable for demanding precision assemblies.

Can these screws be used outdoors or in humid environments?

These are alloy steel fasteners and are generally not recommended for prolonged outdoor or high-humidity exposure without additional protection. In most cases, applying a rust-inhibiting coating or using them in protected assemblies will extend service life. For fully corrosion-resistant applications, stainless steel shoulder screws are typically a better choice.

What thread standard do these shoulder screws use — are they compatible with my parts?

These screws use standard ISO metric threads — M2.5 and M3 — which are compatible with standard metric nuts, threaded inserts, and tapped holes following the ISO 68-1 thread profile. They are not compatible with UNC/UNF inch-standard threads. If your assembly uses inch threads, these will not fit.

What hex key (Allen wrench) size do I need to install these?

For M2.5 socket head shoulder screws, a 2 mm hex key is typically required. For M3 socket head shoulder screws, a 2.5 mm hex key is generally used. Always do a test fit before final assembly to confirm the correct key size for your specific batch.

How do I decide between M2.5 and M3 for my project?

Choose based on the tapped hole or clearance hole size in your mating part. M2.5 screws are suited for lighter-duty precision assemblies, RC components, and small electronics enclosures. M3 screws offer a slightly larger thread engagement and are commonly used in robotics, 3D printer frames, and general mechanical assemblies. When in doubt, check your design drawings or contact us to confirm the right size.

How many screws come in each pack, and can I mix sizes in one order?

Each listing offers pack quantities of 2, 5, 10, 20, 30, or 50 pieces of the same size. To get multiple sizes, simply add each size as a separate item to your cart. All items ship together from our US warehouse.

🛒 Select your size and pack quantity above, then add to cart — ships from our US warehouse.

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