---
product_id: 133684065
title: "Thread Checker SWTC-S21 Nut & Bolt (SAE/Inch)"
brand: "thread checker"
price: "$31301"
currency: COP
in_stock: false
url: https://www.desertcart.co/products/133684065-thread-checker-swtc-s21-nut-and-bolt-sae-inch
store_origin: CO
region: Colombia
---

# Imperial measurement 23 sizes Zinc plated steel Thread Checker SWTC-S21 Nut & Bolt (SAE/Inch)

**Brand:** thread checker
**Price:** $31301
**Availability:** ❌ Out of Stock

## Summary

> 🔧 Get a Grip on Your Projects!

## Quick Answers

- **What is this?** Thread Checker SWTC-S21 Nut & Bolt (SAE/Inch) by thread checker
- **How much does it cost?** $31301 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.co](https://www.desertcart.co/products/133684065-thread-checker-swtc-s21-nut-and-bolt-sae-inch)

## Best For

- thread checker enthusiasts

## Why This Product

- Trusted thread checker brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **📏 Clear Markings:** Thread sizes are permanently stamped in red for quick identification.
- • **🛠️ Built to Last:** Crafted from high-grade zinc plated steel for durability and longevity.
- • **🧰 Hang It Anywhere:** Includes a wire cable loop for convenient storage and accessibility.
- • **🌍 Global Compatibility:** Designed for international use, ensuring versatility across various applications.
- • **🔍 Precision at Your Fingertips:** Easily check 23 common SAE/Inch sizes with a dual nut and bolt gauge.

## Overview

The Thread Checker SWTC-S21 Nut & Bolt is a versatile tool featuring a dual gauge for checking 23 of the most common SAE/Inch sizes. Made from durable zinc plated high-grade steel, it offers permanent size markings for easy identification and includes a convenient hanging loop for storage.

## Description

Nut & Bolt Thread Checker (SAE/Inch)

## Features

- Each size has a nut and bolt checker on the same gauge. 23 of the most common SAE/Inch sizes!
- Thread sizes are permanently stamped (in red) onto each gauge.
- Wire cable with loop for convenient hanging.
- Gauges are a zinc plated high grade steel.
- International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Thread Checker |
| Part number | SWTC-S21 |
| Item Weight | 227 g |
| Product Dimensions | 15.24 x 10.16 x 2.54 cm; 226.8 g |
| Item model number | SWTC-S21 |
| Size | Multi |
| Colour | Metal |
| Material | Alloy Steel |
| Item Package Quantity | 1 |
| Number of Pieces | 23 |
| Head Style | Binding |
| Measurement System | Imperial |
| Batteries included? | No |
| Batteries Required? | No |

## Product Details

- **Material:** Alloy Steel
- **Drive system:** Double Square
- **Head style:** Binding
- **Item dimensions L x W x H:** 15.2 x 10.2 x 2.5 centimetres
- **Exterior finish:** Zinc

## Images

![Thread Checker SWTC-S21 Nut & Bolt (SAE/Inch) - Image 1](https://m.media-amazon.com/images/I/61Kq4v58KNL.jpg)
![Thread Checker SWTC-S21 Nut & Bolt (SAE/Inch) - Image 2](https://m.media-amazon.com/images/I/316a719Q4+L.jpg)

## Questions & Answers

**Q: Unclear from the description, but are these for "fine" or "coarse" or a mix?**
A: Mine started with 6-40 (fine thread) and went up from there. I bought both the SAE and metric. They are great for determining threaded holes in machine restorations and simple thread and size identification.

**Q: Are these thread checkers marked "Made in the USA"?**
A: I guess the answer is "no".  There is a "key chain" at one end that says "The original Thread Checker -  United States Patent #7877882, but other than that there are no markings except for the sizes on each piece.

**Q: I need one of these that goes down to 2-56 sae and m3 metric.  anybody seen such a beast?**
A: Bolt Depot.com has SAE 1-64 to #5-40, 9 pcs, or Metric M12-0.25 to M3.5-0.35 12 pcs. Each are $17.00.

**Q: are these made of aluminum?**
A: Hey, these definitely aren't made of aluminum. Steel for sure, possibly stainless (mine aren't rusty after all these years, anyway). Quality product and quite useful for checking threads in odd places that a thread-card can't reach. Saved me a lot of trouble more than once.

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**Shop now:** [https://www.desertcart.co/products/133684065-thread-checker-swtc-s21-nut-and-bolt-sae-inch](https://www.desertcart.co/products/133684065-thread-checker-swtc-s21-nut-and-bolt-sae-inch)

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*Product available on Desertcart Colombia*
*Store origin: CO*
*Last updated: 2026-02-02*