Best Radius Gauges in 2026

Range: 0.010" - 0.500" with holder

Satin chrome finish

Individually marked

【Range】5/16" - 6" (8mm to 150mm), Stainless Steel Construction.

【Using】Gage expands in a hole to be measured , locks in place and then removed to determine final hole size using a micrometer or calipers.

【Package】Includes 6 sets, with vinyl case

Precision Ground Radius - Each gage is precision ground with a radius, providing two-point contact for maximum accuracy. This guarantees that the measurement you take is precise and consistent every time.

Individually Ordered - You can order the handles in any size you need, making it easy to find the perfect telescoping gage for your needs. Whether you need a Handles can be individually ordered. Handles longer than 12" (300mm) are available on special order. We have you covered.

Durable Construction - The telescoping gage with case is made of hardened steel, ensuring that it will last through even the most rigorous use. It can handle any job you throw at it, making it a versatile tool for your workshop. Both plungers are easily locked at any desired setting.

5'' Satin Chrome Finish Long

Double action rigid handle with self centering feature for quick checking of holes, slots and recess up to 6" deep

The ends of both contact are heat treated stainless steel and precision ground to a radius to allow proper clearance on the smallest hole the gage will enter

Range 2.000"-6.000" diameter, .0005" graduations, 6" depth

For quick transferable accurate inside measurements

Insulated Grip - Carbide Anvils - Tool weight 6.1 lbs

【Package Includes】The radius fillet gauges set contains 5 different shapes and measuring range: R0.3-1.5/ R1-6.5/ R7-14.5/ R15-25/ R25-50 to meet you various need.

【Premium Material】This radius gauge is made of high quality stainless steel, durable, high hardness and resistant to rust.

【Multi-purpose】The radius measuring instrument has two types of leaves so it can check both convex and concave surfaces. The convex pattern is used to detect the concave surface arc, and the concave template is used to detect the convex surface arc.

Radius size is stamped on each gage

Both concave and convex radius gages

With a locking clamp.

Spring loaded with locking knurled knob. Range: 5/16" - 6" (8mm to 150mm)

Stainless Steel Construction, Titanium coating finish

Rigid handle and double action design (self-centering) for quick checking of inside measurements

High quality material: The radius fillet gauge is made of stainless steel material, this radius gauge is sturdy and has long service life. Its quality is guaranteed

Practical: This radius gauge has two types of leaves so it can check both convex and concave surfaces. Convenient for use

Clearly marked: Each leaf is clearly marked, convenient to identify which leaf you need. Bring you a new and different using feeling

Make Layout Work Easier - Laying out radii can be a time-consuming task. With the Starrett Radius Gages make it easier and faster to measure radii than ever before. Made of stainless steel rust and stain resistant.

Easy to Read - The gages have five different gaging surfaces for both convex and concave radii. Each gage has precision finished radii with extra smooth, accurate edges and clearly marked with their radius.

Accurate Measurements - Radii or fillets can be easily check or layout more accurately with Starrett Radius Gages. Available individually and in sets.

Measures Accurately - The Small Hole Gages are ideal for accurately measuring small holes, slots, grooves, and recesses. This makes it perfect for general work where more accurate measurement is required.

Safe and Smooth Adjustment - It is designed with a smooth and sensitive adjustment that makes it easy to get the perfect fit. The adjustment range is also restricted by a safety stop, preventing breakage and damage.

Best Performance - These gages have a precision ground radius on each gage that provides two-point contact for maximum accuracy and a hardened-ball measuring the surface with two-point contact.

Measuring Range: Radius measuring tool, 1/64 - 17/64" by 64th and 9/32 - 1/2" by 32nds with holder, 25pcs, which can effectively assist you in measuring and improve efficiency

High-Quality Material: Radius gauge is made of stainless steel, the advantages of corrosion resistance, high temperature resistance and low temperature resistance ensure that you can perform accurate measurements in various environments

Unique Design: Satin chrome finish is not only beautiful and durable, but also can effectively prevent the 25pcs radius gauge set from being corroded and aged. At the same time, each radius gauge model is marked separately, which is convenient for you to quickly find the right model for use

Double action rigid handle with self centering feature for quick checking of holes, slots and recess up to 6" deep

The ends of both contact are heat treated stainless steel and precision ground to a radius to allow proper clearance on the smallest hole the gage will enter

Constant spring tension gives uniform contact pressure

Use these acrylic radius gauges to quickly measure and lay out inside and outside radii from 1/8 inch to 2 inches

Each gauge is CNC machines from 3/16 inch acrylic with polished edges

Includes the following sizes: 1/8, 1./4, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-1/4, 1-1/2, 1-3/4, and 2 inch thick

Spring loaded with locking knurled knob. Range: 5/16 - 6 (8mm to 150mm)

Stainless Steel Construction, Titanium coating finish

The contact point is hardened tool steel and is fine ground within the final measuring radius

Measuring Range: Ra (0.05-10.00 µm / 1.000-400.0 µinch), Rz (0.020-100.0 µm / 0.780-4000 µinch)

Fourwave filtering methods : RC, PC-RC, GAUSS and D-P

Accuracy:<=10%

Spring loaded with locking knurled knob. Range: 5/16 - 6 (8mm to 150mm)

Stainless Steel Construction, Titanium coating finish

Contact points are hardened tool steel and precision ground in the end measuring radius

Digital accuracy radius gauge: Can both measure Outer & Inner Radius of arcs & Depth and Step measurement. With Digital dial indicator function,Measuring Range: length displacement 0-13mm (0 ~ 0.5 inch); Resolution: 0.005mm (0.00005 inch); Radius Range: 5-700mm (0.2 ~ 27.5 inch)

Large High Definition Display: the readings are clear at a glance, shown Inner and outer diameter ,Measuring Jaws , Radius R value, Metric and Imperial Units ,length,Arc chord height . With data connection port can be connected to the computer to output data, more convenient and quick.

Inch/Metric Conversion: Switchable between mm and inch, Suitable for All Kinds of Measurement, with simple operation, fast reading, small size, convenient reading, hand-held Measurement characteristics.

Pocket-sized economically priced, completely portable instrument which performs traceable surface roughness measurements on a wide variety of surfaces

One measurement allows for user to view any one of the four, switch-selectable, parameters: Ra, Rmax/Ry, Rz

Out-of-range (High or Low) and "battery low" signals are also displayed; simple battery replacement (9V)

Working Principle - Double action handles are rigidly attached to the contact plungers and are automatically self-centering.

Function - Assist in quick checking of holes, slots and recess up to 6 inch deep.

Scope of Application - Telescopic spring piston in the hole (or groove), can conduct inner diameter detection, used with micrometer or caliper, with knurled locking device.

【Practical Set】The radius gauge set includes 5 different shapes and measuring range: R0.3-1.5/ R1-6.5/ R7-14.5/ R15-25/ R26-80, 1pc feeler gauge and a storage box. Wide measuring range, enough quantity, high hardness and precision, good toughness, smooth surface can fully meet your measuring needs.

【Premium Quality】 Tanstic radius gauges are made of high quality stainless steel, durable, hard, strong and rust-resistant. Smooth polished surface and anti-rust oil can perfectly prevent rust and corrosion, which ensures a long service time and to be your helpful measuring assistant.

【Multiple function】Each radius gauge has 2 kinds of blades so that it can check both convex and concave surfaces. The convex pattern for the concave surface arc, and the concave template is used to detect the convex surface arc.

The telescoping gage set is stainless steel construction, titanium coating finish.Double action rigid handle with self centering feature for quick checking of holes, slots and recess up to 6" deep.

The contact point is hardened tool steel and is fine ground within the final measuring radius.

The spring is equipped with a knurled locking knob and a knurled fixing area. Range: 5/16" - 6" (8mm to 150mm).

Size: Range - 5/16-6 inch (8mm to 150mm)

Material: Contact points are hardened tool steel and precision ground in the end measuring radius

Design: Rigid handle and double action design (self-centering) for quick checking of inside measurements

Measure radius of internal and external arcs

Supplied with 5 jaws for different sizes of arc

Battery CR2032

Rugged and Reliable: Features an attractive satin finish and is incredibly durable and corrosion-resistant. With 18 individual gauges, these stainless steel tools promise to provide reliable, accurate measurements every time.

Accurate Inspection: Eight measuring surfaces per gauge. Check primary, 1/2 primary, and complimentary angles with each gauge. Precision machined edges for accurate inspection.

Quick Setup: Quickly and accurately check angles and ID or OD chamfers inside and outside the machine. Chamfering turning tool positioning. Quickly set up and fix the workpiece.