Thread Charts

Standard Thread, Tap and Drill Sizes

In this comprehensive page you can navigate to read Thread Charts and you can download them. Red framed ones are imperial unit Threads , Green framed ones are Metric units.

Chart Sheets Downloads Avaiable From Here

BA-British Association Threads

BA threads are fine, having a 47.5° thread angle, which makes them distinct from most other threads. This is an uncommon thread.

BSPT (Rc) British Standard Pipe Taper Threads

The British Standard Pipe Taper (BSPT) is a type of screw thread used for pipes and fittings.

NPS American National Straight Pipe Threads

The National Pipe Straight Thread standard, also known as American National Straight Pipe Threads, is a U.S. standard for straight (non-tapered) pipe threads.

Brass Threads Tap Drill Size

Brass threads are used for corrosion resistance, aesthetics, and electrical conductivity in various applications.

BSW British Standard Whitworth Threads

The British Standard Whitworth (BSW) is one of the older and original British thread standards.BSW threads have a 55° thread.

NPT (API) American National Pipe Taper Threads

National Pipe Taper threads are sometimes referred to in the context of the American Petroleum Institute (API) standards. 60° thread angle

BSF-British Standard Fine Threads

BSF (British Standard Fine) has a 55° thread angle, used in older UK automotive/aviation industries.

ME Model Engineers Threads

The Model Engineers (ME) thread series is a standard specifically developed for the needs of model engineers.

UNC Unified National Coarse Thread

The UNC (Unified National Coarse) thread standard is one of the most commonly used thread forms in the United States.UNC threads have a 60° thread angle.

BSP PI (Rp) BSPF (G)  British Standard Pipe Parallel

Both types have a thread angle of 55°. They’re commonly used for plumbing and gas fittings.

Metric Standard Threads

Metric Standard Threads use a 60° thread angle, with sizes defined in millimeters. They are internationally recognized.

UNF Unified National Fine Threads

The UNF (Unified National Fine) thread standard is a type of thread form that is part of the Unified Thread Standard, predominantly used in the United States.