M2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper - HomeDIYer
M2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper - HomeDIYer
M2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper - HomeDIYer
M2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper - HomeDIYer
M2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper - HomeDIYer
M2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper - HomeDIYer
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M2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper - HomeDIYerM2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper - HomeDIYerM2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper - HomeDIYerM2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper - HomeDIYerM2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper - HomeDIYerM2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper - HomeDIYer

M2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Replacement Knob Bolt for Vernier Caliper

HomeDIYer
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By HomeDIYer®

Price:
$1.96 USD
Stock:
In stock (500 units), ready to be shipped

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Description

🔩 M2.5 x 7.5mm Stainless Steel Knurled Thumb Screw – Precision Knob Bolt for Vernier Caliper & Measuring Tools

You’ve got a vernier caliper with a loose or missing locking screw – and a standard thumb screw is either too long, the wrong thread, or made of soft material that strips. This M2.5 x 7.5mm knurled thumb screw is precision‑machined from stainless steel to fit many digital and dial calipers. The diamond‑knurled head gives you a secure grip for hand tightening, and the stainless steel construction resists rust and wear – critical for measuring tools that live in workshops or labs. Use it as a direct replacement for the original locking screw, or keep a spare in your tool kit.

✨ Key Features – M2.5 x 7.5mm Knurled Thumb Screw

  • 🔘 Knurled knob head – Fine diamond knurling provides excellent fingertip grip for tool‑less locking and adjustment.
  • 🛡️ Stainless steel construction – Corrosion‑resistant, durable, and non‑magnetic. Ideal for workshop and measuring instruments.
  • 📏 M2.5 metric thread (2.5mm diameter, 0.45mm pitch) – Common size for vernier caliper locking screws and small precision instruments.
  • 📐 7.5mm thread length (under head) – Designed to match the typical thickness of caliper jaw locking mechanisms. Fully threaded.
  • 🛠️ Direct replacement for many calipers – Fits most standard vernier, dial, and digital calipers (check original screw size before ordering).
  • 🔧 Versatile use – Vernier calipers, micrometers, small fixtures, hobby tools, and any device requiring a small hand‑tightened locking screw.

📏 Specifications – M2.5 x 7.5mm Stainless Steel Thumb Screw

Thread Diameter (M) Thread Pitch (mm) Thread Length (mm) Head Type Head Diameter (approx.) Head Height (approx.) Material
M2.5 0.45 7.5 mm (under head) Knurled cylinder / knob ~5‑6 mm ~3‑4 mm Stainless steel

* Length measured from underside of head to tip. Fully threaded. Head dimensions are approximate – may vary slightly by manufacturer.

🛠️ Compatible Tools & Applications

Instrument / Use Details
Vernier calipers (digital/dial) Replaces the locking screw on most 150mm/200mm calipers (Mitutoyo, Moore & Wright, etc.). Check original thread size first.
Micrometers Some small micrometers use M2.5 locking screws – verify before ordering.
Workshop fixtures & jigs Tool‑less clamping, adjustable stops, and quick‑release mechanisms.

❓ Frequently Asked Questions – Vernier Caliper Thumb Screw

1. Will this screw fit my specific vernier caliper?

Many standard vernier, dial, and digital calipers use an M2.5 x 0.45mm locking screw with a thread length of 6–8mm. This 7.5mm version is a common replacement. However, we strongly recommend measuring your original screw’s thread diameter, pitch, and length before ordering. If uncertain, contact us with your caliper model.

2. Is the screw fully threaded? What does “thread length under head” mean?

Yes – it is fully threaded from the underside of the head to the tip. The 7.5mm is the length of the threaded shaft, not including the knurled head. This ensures maximum grip in the caliper’s threaded hole.

3. Will stainless steel rust? Is it safe for workshop use?

Stainless steel (likely 303 or 304 grade) offers excellent corrosion resistance. It will not rust in normal workshop conditions, even with occasional exposure to oil or moisture. Perfect for long‑term use on measuring tools.

4. Do I need a nut or washer with this screw?

No – this screw is designed to thread directly into the caliper’s existing threaded hole. No nut or washer is required. Simply screw it in until it locks the jaw.

5. Can I use this for other applications besides calipers?

Yes – it works for any application requiring a small M2.5 knurled thumb screw, such as camera accessories, small jigs, or instrument adjustments. Ensure the thread length matches your needs.

6. What head style does it have? Is it comfortable to turn by hand?

The head is a cylindrical knurled knob with a diamond or straight knurl pattern. It is designed for comfortable fingertip gripping, even with light oil on your hands.

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