It’s important to consider the hardness of the material you’re working with and refer to the manufacturer’s instructions if necessary. However, when working with harder materials like steel or stainless steel, a slightly smaller drill bit, such as 7/32″, may be used to create a tighter connection with the screw or bolt. This size ensures a snug fit between the tap and the drilled hole, resulting in secure threads. The perfect drill size for a 1/4-20 tap is a #7 drill bit, with a diameter of 13/64″. Using an incorrect drill size can result in loose or stripped threads, compromising the strength and integrity of the connection. The drill size determines the hole diameter that needs to be created before tapping. These taps are commonly used in various applications, including automotive, construction, and DIY projects.Ĭhoosing the right drill size for a 1/4-20 tap is crucial for achieving accurate and secure threads. The “1/4” refers to the tap’s outer diameter, while the “20” represents the number of threads per inch. Understanding the 1/4-20 Tapīefore diving into the drill size for a 1/4-20 tap, let’s understand what a 1/4-20 tap is and why it’s essential to choose the accurate drill size for this type of tap.Ī 1/4-20 tap is a type of threading tool used to create internal threads in materials such as metal or plastic. Refer to the sections below for more detailed information on understanding the tap, factual data on drill sizes, drilling techniques, and safety precautions. Ensure the tapped hole is deburred and cleaned before inserting the screw or bolt.īy following these recommendations and techniques, you can achieve accurate and successful tapping with your 1/4-20 tap.Utilize the pecking technique to prevent overheating or breaking of the tap or drill bit.Use clamps to secure the material and wear safety eyewear and gloves for protection.

Consider the hardness of the material you’re drilling into and refer to the manufacturer’s instructions.

The perfect drill size for a 1/4-20 tap is a #7 drill bit with a diameter of 13/64″.Let’s dive into the details and uncover the perfect drill size for your 1/4-20 tap. By selecting the right drill bit size, you can ensure accurate and secure connections for your screws or bolts. When it comes to tapping holes for a 1/4-20 tap, using the correct drill size is crucial. Noble Aerospace Private Limited.Are you unsure about the right drill size for a 1/4-20 tap? In this guide, we will provide clear and expert advice to help you achieve optimal drilling results. Helicoil, helicoil insert, helicoil inserts, heli-coil, helicoil tap, helicoil insertion tool, helicoil removal tool, helicoil thread chart, helicoil drill chart, helicoil thread gauge, helicoil kit, helicoil tool kit, helicoil thread repair kit, NASM21209,MS21209 ,NASM33537,MS33537 ,MS122076 to MS124831,NAS1130, LN9039,LN9039A, LN9499 ,LN9499A,DIN8140, MS122076 to MS124831,MA3279 ,MA3280 ,MA3281 ,MA3329 ,MA3330 ,MA3331, SAE8879, BACi12AE,AGS3600, AGS3700, AGS4677, AS6733, AS6734, AS8455 ,AS8456 ,AS3094 AS3095,AS3096, AS3097, GE N926, N926A ,N926B ,N926C, helicoil tool holder,helicoil tool set ,wire thread insert, self locking insert, screw locking insertĭisclaimer | Privacy Policy | Terms | Sitemap F is equal to the insertįor Plug Taps 3/8' or M10 and larger F is equal to the insert nominal

3/4 - 1-1/2 pitch of insert 'set down' to allow forįor plug Taps 5/16' or M8 and smaller.

Tap and drill bit size chart