M48 screw or bolt dimensions and sizes are massive fasteners used in heavy industrial foundations, bridge anchorages, large-scale power plant assemblies, and heavy maritime engineering. This size has a 48.00mm nominal major diameter and is available in M48 x 5.0 for the coarse series, where 5.0 represents the thread pitch in millimeters. This reference chart follows respective DIN and ISO standards for each head style and DIN 13-1 (coarse) and ISO 68-1 standards for thread dimensions to ensure global compatibility.
Disclaimer: Actual dimensions and tolerances may vary slightly depending on head style (e.g., Heavy Hex, Stud Bolts, Anchor Bolts), manufacturer, or material grade — always verify with the official product datasheet before use.
M48 x 5.0 Screw & Bolt – DIN 13-1/ISO 68-1
Dimension
Size (mm)
Min
Max
Major Diameter
47.399
47.929
Pitch Diameter
44.431
44.681
Minor Diameter
41.351
42.516
Thread Pitch
5.0
Major Diameter
47.399
47.929
Pitch Diameter
44.521
44.681
Minor Diameter
41.441
42.516
Thread Pitch
5.0
M48 x 4.0 Screw & Bolt – DIN 13-21/ISO 68-1
Dimension
Size (mm)
Min
Max
Major Diameter
47.465
47.94
Pitch Diameter
45.106
45.342
Minor Diameter
42.642
43.61
Thread Pitch
4.0
Major Diameter
47.465
47.94
Pitch Diameter
45.192
45.342
Minor Diameter
42.728
43.61
Thread Pitch
4.0
M48 x 3.0 Screw & Bolt – DIN 13-21/ISO 68-1
Dimension
Size (mm)
Min
Max
Major Diameter
47.577
47.952
Pitch Diameter
45.791
46.003
Minor Diameter
43.943
44.704
Thread Pitch
3.0
Major Diameter
47.577
47.952
Pitch Diameter
45.871
46.003
Minor Diameter
44.023
44.704
Thread Pitch
3.0
M48 x 2.0 Screw & Bolt – DIN 13-21/ISO 68-1
Dimension
Size (mm)
Min
Max
Major Diameter
47.682
47.962
Pitch Diameter
46.483
46.663
Minor Diameter
45.251
45.797
Thread Pitch
2.0
Major Diameter
47.682
47.962
Pitch Diameter
46.551
46.663
Minor Diameter
45.319
45.797
Thread Pitch
2.0
M48 x 1.5 Screw & Bolt – DIN 13-21/ISO 68-1
Dimension
Size (mm)
Min
Max
Major Diameter
47.732
47.968
Pitch Diameter
46.834
46.994
Minor Diameter
45.91
46.344
Thread Pitch
1.5
Major Diameter
47.732
47.968
Pitch Diameter
46.894
46.994
Minor Diameter
45.97
46.344
Thread Pitch
1.5
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 M48 coarse screws or bolts?
For metric fasteners, the recommended tap drill size can be calculated using this formula: Major Diameter – Thread Pitch. For an M48 x 5.0 (Coarse), the recommended tap drill is 43.00mm.
What clearance hole size is needed for an M48 screw or bolt?
For an M48 fastener, a 50.00mm drill bit is utilized for a Close Fit, a 52.00mm bit is used for a Normal Fit, and a 56.00mm bit is recommended for a Loose Fit. A Normal Fit is the industry standard to ensure the massive bolt shank passes through the assembly without binding while maintaining structural alignment.
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.
