Nuts & Bolts - Guide

Nuts & Bolts - Guide is a comprehensive reference tool for machinists, engineers, hobbyists, and DIY enthusiasts. Quickly look up screw dimensions, tap drill sizes, and clearance holes for both metric and imperial fasteners.

WORKS COMPLETELY OFFLINE

All data is stored locally on your device. No internet connection required - perfect for workshops, garages, and job sites where connectivity is limited.

METRIC FASTENERS (M1 - M36)

• Thread dimensions: major, minor, and pitch diameter

• Coarse and fine pitch specifications

• Tap drill sizes for 75% and 50% thread engagement

• Clearance hole sizes: close, normal, and free fit

IMPERIAL FASTENERS (#0 - 2")

• UNC (Coarse) and UNF (Fine) thread data

• Number sizes (#0 to #14) and fractional sizes (1/4" to 2")

• Tap drill sizes in decimal, fractional, and letter/number formats

• Clearance hole recommendations

HEAD TYPE DIMENSIONS

Reference dimensions for common fastener head styles:

• Socket Head Cap Screws (SHCS)

• Pan Head

• Flat/Countersunk (82° and 90°)

• Button Head

• Hex Head

• And more...

Each head type includes:

• Head diameter and height

• Drive type and size (hex key, Phillips, etc.)

• Applicable standards (DIN, ANSI/ASME)

ADDITIONAL TOOLS

• Unit converter: inches to millimeters

• Fractional to decimal conversion

• Drill size lookup table

PRO FEATURES

Upgrade to PRO for complete access:

• All metric sizes (M1 to M36)

• All imperial sizes (#0 to 2")

• Fine and extra-fine pitch threads

• All head type dimensions

• 50% thread tap drill data

• Clearance hole information

• Favorites for quick access

• Ad-free experience

DESIGNED FOR THE WORKSHOP

• Clean, easy-to-read interface

• Large text for quick reference

• Dark mode support

• Fast navigation between sizes

Whether you're a machinist selecting tap drills, an engineer designing threaded holes, a 3D printing enthusiast sizing screw bosses, or a DIYer working on a project - this app provides the fastener data you need.

Everything you need for the workshop - download now.