---
product_id: 34214977
title: "Aircraft Tool Supply Threaded Drill Bits #40, #30, #21, #12 (4-Pack)"
brand: "aircraft tool supply"
price: "15.88 OMR"
currency: OMR
in_stock: true
reviews_count: 8
category: "Aircraft Tool Supply"
url: https://www.desertcart.com.om/products/34214977-aircraft-tool-supply-threaded-drill-bits-40-30-21-12
store_origin: OM
region: Oman
---

# Aircraft Tool Supply Threaded Drill Bits #40, #30, #21, #12 (4-Pack)

**Brand:** aircraft tool supply
**Price:** 15.88 OMR
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Aircraft Tool Supply Threaded Drill Bits #40, #30, #21, #12 (4-Pack) by aircraft tool supply
- **How much does it cost?** 15.88 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/34214977-aircraft-tool-supply-threaded-drill-bits-40-30-21-12)

## Best For

- aircraft tool supply enthusiasts

## Why This Product

- Trusted aircraft tool supply brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

Package of four (4) 1/4-28 Threaded Drill Bits in sizes: #40, #30, #21, and #12. Cobalt steel with black oxide finish.

Review: Great bits - ATS is a good supplier, product is what it is supposed to be.
Review: Bit - Good quality for the price 👌

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B005VR9L3E |
| Best Sellers Rank | #122,841 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Threaded Shank Drill Bits #2,454 in Drill Bits |
| Brand | Aircraft Tool Supply |
| Cutting Angle String | 118 Degrees |
| Date First Available | October 7, 2011 |
| Finish Type | Black Oxide |
| Item Weight | 0.01 ounces |
| Item model number | 4PCBITS |
| Manufacturer | Aircraft Tool Supply |
| Material | Cobalt Steel |
| Number of Flutes | 2 |
| Number of Pieces | 4 |
| Package Dimensions | 4.1 x 1.9 x 1.4 inches |
| Point Style | Split Point |
| Set Name | 4 |
| Shank Type | Threaded |
| Surface Recommendation | Metal |
| Tool Flute Type | Spiral |
| Unit Count | 4 Count |

## Product Details

- **Brand:** Aircraft Tool Supply
- **Cutting Angle String:** 118 Degrees
- **Finish Type:** Black Oxide
- **Material:** Cobalt Steel
- **Shank Type:** Threaded

## Images

![Aircraft Tool Supply Threaded Drill Bits #40, #30, #21, #12 (4-Pack) - Image 1](https://m.media-amazon.com/images/I/312FsrwbNNL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great bits
*by S***Y on November 19, 2025*

ATS is a good supplier, product is what it is supposed to be.

### ⭐⭐⭐⭐⭐ Bit
*by D***. on March 17, 2024*

Good quality for the price 👌

### ⭐⭐⭐ Okay bits, but use very carefully
*by M***9 on January 29, 2016*

The number 40 bit broke on the first hole, but I have to take credit for the assist rather than totally blaming the bit. It is used in a 90 degree drill attachment, and when it drilled through the 1/8" aluminum, instead of maintaining speed and pulling it out, I let the drill slow and didn't hold enough pressure on the 90 degree drill attachment so it twisted and snapped the bit. I've been drilling a large number of holes with a normal number 40 bit and it flexes without breaking, so yes, I feel the bit isn't very strong. It wasn't as sharp as my other bits were either, and took about 10 minutes to drill through 1/8" aluminum. Being more careful with the #30 and #20, I've managed to keep them from twisting and they haven't broken yet.

## Frequently Bought Together

- Aircraft Tool Supply Threaded Drill Bits #40, #30, #21, #12 (4-Pack)
- Drill Bits Short Length Threaded Shank, Short Series Drill Bit Set 3 Tight Fit Tools 00133
- Industrial Aerospace Aircraft Mini 90 Degree Angle Air Drill Head, W/Comfort Grip, (Sumake ST-4406)

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.com.om/products/34214977-aircraft-tool-supply-threaded-drill-bits-40-30-21-12](https://www.desertcart.com.om/products/34214977-aircraft-tool-supply-threaded-drill-bits-40-30-21-12)

---

*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-02-26*