M4 screw or bolt dimensions and sizes are essential for furniture assembly (IKEA standards), PC monitor VESA mounts, and medium-scale robotics. This size has a 4.00mm nominal major diameter and is available in M4 x 0.7 for the coarse series and M4 x 0.5 for the fine series, where 0.7 and 0.5 represent the thread pitch in millimeters. This reference chart follows respective DIN and ISO standards for each head style and DIN 13-1 (coarse series), DIN 13-21 (fine series), and ISO 68-1 standards for the thread dimensions table to ensure compatibility across metric fastening applications.
Disclaimer: Actual dimensions and tolerances may vary slightly depending on head style, manufacturer, or material — always verify with the official product datasheet before use.
M4 x 0.7 Screw & Bolt – DIN 13-1/ISO 68-1
Dimension
Size (mm)
Min
Max
Major Diameter
3.838
3.978
Pitch Diameter
3.433
3.523
Minor Diameter
3.002
3.22
Thread Pitch
0.7
Major Diameter
3.838
3.978
Pitch Diameter
3.467
3.523
Minor Diameter
3.036
3.22
Thread Pitch
0.7
M4 x 0.5 Screw & Bolt – DIN 13-21/ISO 68-1
Dimension
Size (mm)
Min
Max
Major Diameter
3.874
3.98
Pitch Diameter
3.58
3.655
Minor Diameter
3.272
3.439
Thread Pitch
0.5
Major Diameter
3.874
3.98
Pitch Diameter
3.607
3.655
Minor Diameter
3.299
3.439
Thread Pitch
0.5
Major Diameter –
The largest diameter of the external thread, measured crest to crest.
This defines the nominal size (e.g., M12 which is 12 mm of nominal major diameter).
Pitch Diameter –
The diameter of an imaginary cylinder where the thread thickness equals
the space between threads. This is the critical dimension for thread fit
(Tolerance classes 2A/3A for Imperial; 6g/4g6g for Metric).
Minor Diameter –
The smallest diameter of the external thread, measured root to root.
This represents the core strength of the fastener and is the theoretical
maximum diameter of the tap drill.
Thread Pitch –
The distance from a point on one thread to the corresponding point on the next.
What is the tap drill size for M4 x 0.7 and M4 x 0.5 screws or bolts?
For metric fasteners, the recommended tap drill size can be calculated using this formula: Major Diameter – Thread Pitch
Therefore, for an M4 x 0.7 screw or bolt (coarse), the recommended tap drill is 3.30mm, while for an M4 x 0.5 (fine), it is 3.50mm.
What clearance hole size is needed for an M4 screw or bolt?
For a Close Fit, a 4.30mm drill bit is utilized. For a Normal Fit, a 4.50mm bit is used, and for a Loose Fit, a 4.80mm bit is recommended to allow the fastener body to pass through the assembly without interference.
What is the difference between a bolt and a screw?
The difference is based on the intent of the fastener’s use; If the primary intent is for the fastener to pass through an unthreaded hole and be assembled with a nut, it is a Bolt. In this application, you usually hold the head and turn the nut to apply tension. But if the primary intent is for the fastener to be installed into a threaded (tapped) hole, it is a Screw. In this application, the connection is tightened by turning the head of the fastener itself.
