Nut and Bolt Thread Checker Set
No More Fastener Guesswork. Identify Any Thread Instantly.
An all-in-one inspection system featuring dual-color recognition, detachable gauges, and rugged organization.
Select the Perfect Set for Your Projects
Choose between the 26-piece essential set or the comprehensive 44-piece system for complete range testing.
26-Piece Essential Set
26 PCS
- Gauges Included: 14 Inch (SAE) & 12 Metric (ISO)
- Metric Sizes: M4 to M12
- Inch Sizes: 6-32 to 1/2-20
44-Piece Ultimate Set
44 PCS
- Gauges Included: 23 Inch (SAE) & 21 Metric (ISO)
- Metric Sizes: M3 to M24
- Inch Sizes: 6-32 to 1"-12
Verify Both Nuts and Bolts with a Single Gauge
Every individual gauge in this system features a dual-end design. Twist your bolt into the female threaded base to confirm bolt parameters, or thread your nut onto the male stud to verify nut dimensions. No need to reach for separate tools.
Detachable Gauges for Tight, Hard-To-Reach Areas
Unlike bulky, rigid layout boards, these gauges are completely individual and removable. Easily slide a single gauge out of its designated foam slot to measure fixed fasteners directly on a vehicle frame, deep within an engine bay, or in hard-to-access machinery spaces.
Laser-Etched Markings & Precise CNC Engineering
Constructed from premium aircraft-grade aluminum alloy and machined with strict CNC tolerances down to ±0.0005" (0.01mm) for ultimate precision. Each piece features permanent white laser-etched lettering that remains clear, readable, and highly visible over time in dusty, dim, or oil-slicked shop environments.
One Toolkit, Infinite Diagnostics
Solve dimension confusion across multiple environments and repair situations.
Automotive Restoration & Maintenance
Rapidly check fasteners on engines, suspension components, and chassis during rebuilds or basic oil changes.
Heavy Industry & Machinery
Inspect automated equipment threads to ensure replacement fasteners conform to strict specifications.
Hardware Sorting & Organization
Organize bins filled with mixed, stray screws, nuts, and bolts into clean, sorted collections.
Technical Specifications
Exact physical parameters and complete size listings for both sets.
| Specification | 26-Piece Essential Set | 44-Piece Ultimate Set |
|---|---|---|
| Total Gauges | 26 individual gauges (14 Inch & 12 Metric) | 44 individual gauges (23 Inch & 21 Metric) |
| Metric Range (ISO) | M4x0.7 to M12x1.75 | M3x0.5 to M24x3.0 |
| Inch Range (SAE) | 6-32 to 1/2-20 | 6-32 to 1"-12 |
| Material & Build | Aircraft-grade aluminum alloy, laser-etched, CNC machined | Aircraft-grade aluminum alloy, laser-etched, CNC machined |
| Storage Case | Black carry box, red lid size reference chart, foam cutout insert | Black carry box, orange lid size reference chart, foam cutout insert |
Frequently Asked Questions
Answers to standard operations, identification, and technical questions.
âť“ What do the red and blue colors represent?
The anodized colors act as an instant sorting guide: Red pieces always indicate Metric (ISO) thread sizes, and Blue pieces always indicate Inch/Standard (SAE) sizes. This prevents cross-threading or confusing similar-looking standard and metric threads.
âť“ Will the laser-etched markings rub off with oil or use?
No. Unlike stamped or printed indicators, these markings are laser-etched into the flat middle collar of each gauge. This ensures permanent, high-contrast size visibility that resists mechanical abrasion, shop grease, solvents, and oil.
âť“ Can I use these to check fasteners already installed on a vehicle?
Yes, absolutely. Because each individual gauge is completely loose and detachable from the storage case, you can take a single gauge out to a vehicle or machine and test studs or threads in tight, restricted spaces that rigid boards cannot reach.