Best Steel Bolt Gauges in 2026

"QUICKLY IDENTIFY BOLTS AND NUTS - The SST Identibolt is your One-stop Shop for Verifying the Size and Thread Pitch of All Your Standard Hardware! Never Again Wonder What Size Fastener You Have! Easily Distinguish Between Metric and Inch Thread Sizes, and Quickly Measure Bolt Lengths and Nut Diameters (Unless You'll Miss Making Multiple Trips to the Hardware Store)"

ULTIMATE NUT AND BOLT IDENTIFICATION TOOL - The Identibolt Measures Common Imperial SAE and Metric Thread Sizes, Identifying Hardware from #6 to ½" & 4mm to 14mm. Each Size is Accompanied By a Male Thread (for Nuts and Washers), and a Female Thread (for Bolts and Screws).

DURABLE AND BUILT TO LAST - SST's 4"x20" Solid Metal Plate Construction is Hard Anodized for Maximum Thread Strength, With Laser Etched Markings that Will Never Fade or Get Scratched off. Multiple Mounting Holes Give You the Option to Wall Mount it, Secure it in Your Toolbox, or Keep it on Your Workbench!

🔦Feature - 【Upgraded Double-sided Printing Size】The Inch & Metric Thread Checker is an accurate and easy-to-use thread identifier for both nuts and bolts. Each individual gauge features a male threaded stud on one end and a female threaded hole on the other. The Thread Checker is especially well suited for distinguishing between similar inch and metric threads. Conveniently assembled onto a wire loop, it's the perfect portable solution!

🔦Nut & Bolt Thread Checker - Each size has a nut and bolt checker on the same gauge 26 male/female gauges - 14 inch & 12 metric.

🔦Zinc Plated for Inch Size - Includes 14 Inch Size part numbers: 6-32, 8-32, 10-24, 10-32, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, 1/2-13, 1/2-20

Measures diameter, thread pitch & length of nuts, bolts & screws

Measures fractional bolts from size #4 to 1" up to 7" long

Measures metric bolts & screws from size 3mm to 22mm

Top Quality Nut, Bolt & Screw Gauge; For Use With Standard or Metric, Coarse & Fine Diameters, Lengths & Thread Pitches

This gauge has 'MarineBoltSupply' printed on the back

Package Dimensions: 8.75 inch L x 3.25 inch W x 0.25 inch H

【Nut & Bolt Thread Checker】 These thread gauges includes 26 male/female gauges - 14 inch & 12 metric.Thread sizes are permanently carved on each gauge with distinct mark, which makes the mark easy for you to tell.

【Efficiency Improving】Big Time Saver No more bent over the container looking for a nut/bolt to finish your project，especially the nut or bolt that cannot be removed，Each size has a nut and bolt checker on the same gauge， Excellent item for the mechanic Every workshop should have one.

【High Quality Material】 These nut & bolt thread checkers are made of strong material. Inch gauges are clear zinc plated, metric gauges are black oxide.

Inch and Metric & Coarse and Fine Threading

Measures fractional bolts from size #4 to 1" up to 7" long

Measures metric bolts & screws from size 3mm to 22mm

🔩 [Upgraded Thread Checking Set] Every thread checker is inserted into well cut foam that holds them firmly in place to prevent them from bouncing around in the box, but not so tight that you can easily remove them. Easier to use than connected nut/thread checkers, because you no longer have to carry a whole bunch of gauges to measure individual screws or nuts and can reach any tight spot.

🔩 [Lifesaver Before Heading to Hardware Store] Just screw the nut or bolt into the screw thread gauge, it takes you a few seconds to check the size. You do not need to drive forth and back to and from the hardware and auto parts stores for check any more. Also, this nut and bolt gauge is especially well suitable for the distinguish between similar inch and metric threads.

🔩 [Zinc Plated for Inch Size] Includes 14 Inch Size part numbers: 6-32, 8-32, 10-24, 10-32, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, 1/2-13, 1/2-20.

Nut & Bolt Thread Checker---with 44 male/female gauges,included 23 inch & 21 metric sizes,our product is the ideal solution to all your nut and bolt checking needs. the thread sizes are permanently stamped onto each gauge, making it easy to identify the right size for your project

Strong Stainless Steel Build---our thread detector set is made from high-quality stainless steel that can withstand heavy use and last for years. the strong build ensures that each gauge is sturdy and reliable, making it an essential tool for any workshop or diy enthusiast

21 Metric Sizes part number ---M3x0.5, M4x0.7, M5x0.8, M6x1.0, M7x1.0, M8x1.0, M8x1.25, M10x1.0, M10x1.25, M10x1.5, M12x1.25, M12x1.5, M12x1.75, M14x1.5, M14x2.0, M16x1.5, M16x2.0, M20x1.5, M20x2.5, M24x2.0, M24x3.0

【Upgraded Bundle】This nut and bolt thread checker set includes 26 individual thread gauges - 14 inch size & 12 metric size. All gauges is inserted in a EVA holder and encased into a portable PVC case, which is water-proof and rust-proof. Provide better protection and never lose each single gauges. It also comes with a string which 26 gauges can be stung on if you like.

【Easy to Read】Strong laser printed label on each individual bolt nut gauge. There are also one-to-one labels on EVA holder and sticker of case for easy reference and use. No more held it at a right angle in decent light to read the markings.

【More Flexibility】Just take a single gauge from the case to check the screw size simply. Easily to reach confined areas as you wish. No more cutting the awkward wire by yourself. No more twist the entire wire painfully to check a fixed bolt or a threaded hole, especially in a narrow corner or some tight spots.

GlowShift Diesel Gauge Package for the 1998-2002 Dodge Ram Cummins 2500 3500 Truck features a Black Triple Pillar Pod, Tinted 7 Color Series 3 Gauge Diesel Set, Boost Bolt Adapter, Fuel Pressure Banjo Bolt/Snubber Valve Adapter, 3 Gauge Power Wiring Harness & an Installation Guide that Walks Users Through the Process of Installing the Gauges, Sensors & Pod Step-By-Step

Includes 60 PSI Boost Gauge with 1/8-27 NPT Compression Fittings, 9' Nylon Boost Hose & Boost Bolt Adapter - 1500°F Pyrometer EGT Gauge with 1/8-27 NPT EGT Probe with 3' of Wire, 6' Sensor Harness & 2' Power Harness - 30 PSI Fuel Pressure Gauge with 1/8-27 NPT Pressure Sensor, 9' Sensor Harness, 2' Power Harness & Banjo Bolt/Snubber Valve Combo Adapter - Tinted 7 Color Series Features a Black Dial, Tinted Lens, 7 Solid Color Modes & 2 Color Cycle Modes

Black Triple Pillar Gauge Pod for 1998-2002 Dodge Ram 2500 3500 Trucks Mounts 3 Gauges to the Truck's A-Pillar - Complete Factory A-Pillar Replacement - Manufactured from ABS Plastic - Includes Mounting Hardware

These shock-proof liquid filled gauges are vibration resistant to monitor your oil pressure with extreme accuracy!

Rocker Box Mounting Kits come with all of the necessary lines and fittings to bolt an oil gauge to a 1984-1999 Big Twin "EVO" Motor.

Gauge: Rugged gauge case is constructed of stainless steel with brass internals. Silicone filled for vibration dampening with a durable acrylic lens. 1-3/4” Gauge Face (including bezel). 0-60 psi 1/8” NPT rear connection. GAUGE FACE IS NOT REAL CARBON FIBER

Bump steer gauges from Longacre feature a simplified design that uses precision indicators to tell you the exact amount of bump steer to within .001"

Constructed for strength with new precision plate, 3/8" thick T6 billet aluminum for the ultimate in accuracy and comes anodized and laser engraved

Extended height design - check bump steer at ride height or on stands & includes 8 bolt-drive flanges, adjustable stand, and precision dial indicator

MaxTow Diesel Gauge Package for the 2003-2009 Dodge Ram Cummins 2500 3500 Truck features a Factory Color Matched Taupe Triple Pillar Pod, White & Green Double Vision Series 3 Gauge Diesel Set, Boost Bolt Adapter, Fuel Pressure Banjo Bolt/Snubber Valve Adapter, 3 Gauge Power Wiring Harness & an Installation Guide that Walks Users Through the Process of Installing the Gauges, Sensors & Pod Step-By-Step

Includes 60 PSI Boost Gauge with 1/8-27 NPT Pressure Sensor, 9' Sensor Harness & Boost Bolt Adapter - 1500°F Pyrometer EGT Gauge with 1/8-27 NPT EGT Probe with 3' of Wire & 6' Sensor Harness - 30 PSI Fuel Pressure Gauge with 1/8-27 NPT Pressure Sensor, 9' Sensor Harness & Banjo Bolt/Snubber Valve Combo Adapter - 3 Gauge Power Wiring Harness - White & Green Double Vision Series Features Analog & Digital Readouts, Green LED Display with Red Needle, White Dial & Clear Lens

Factory Color Matched Taupe Triple Pillar Pod for 2003-2009 Dodge Ram 2500 3500 Trucks Mounts 3 Gauges to the Truck's A-Pillar - Complete Factory A-Pillar Replacement - Manufactured from ABS Plastic - UV Protected - Includes Mounting Hardware

28 SIZE Nut and Bolt Identification Tool Ruler With Inches And Centimeters On Both Sides

Each size has a nut and bolt checker on the same gauge 28 male/female gauges - 14 inch & 14 metric.

METRIC THREAD SIZES: -M4 x 0.7 -M5 x 0.8 -M6 x 1.0 -M7 x 1.0 -M8 x 1.0 -M8 x 1.25 -M10 x 1.0 -M10 x 1.25 -M10 x 1.5 -M12 x 1.25 -M12 x 1.5 -M12 x 1.75 -M14 x 1.5 -M14 x 2.0

[ IMPORTANT ] VMS RACING BRAND Design (NOT generic). Comes in VMS Racing Branded BOX. Brand New in Box / Never Used / Never Installed. VMS RACING Brand LIQUID FILLED 1 1/2" (38.1MM) O.D. mechanical 0-100 PSI fuel pressure gauge WITH the Honda/Acura fuel rail adapter. Gauge can be used as a fuel pressure , oil pressure , air pressure etc... gauge. Gauge will bolt on to a 1/8" NPT female port. VMS RACING engineers designed this gauge to be the ULTIMATE liquid filled gauge for many reasons:

PERMANENTLY SEALED UNIT: UNLIKE basically EVERY other 1 1/2 inch in-line gauge on the market, the VMS RACING gauge is PERMANENTLY SEALED. The plug cannot be removed and will NOT leak. It does not have a removable rubber plug on the back, which always fails, leaks and can be a fire hazard! Removable, leaky rubber plugs are BAD IDEA! Our gauges ELIMINATE THAT THREAT.

NICKEL PLATED FOR CORROSION RESISTANCE: Nickel plating prevents corrosion of the gauge, will look great for years to come! This is a show-quality gauge that you can be proud of for looks and reliability.