Today, we are going to discuss the "List of screw effective diameter, thread height, pitch, and lead angleThis is a memo about: [topic name]. It's easy to find JIS standards for metric thread nominal sizes online, but I wanted to see the pitch diameter, thread height, and lead angle together, so I created a chart.Please take advantage of this service.
- Standard Dimensions and Lead Angle Table for Metric Thread Designations
- Thread root diameter and how to find it
- Names for each diameter used in screws
- Formula for calculating the effective diameter of a screw
- The formula to calculate the minor diameter of the internal thread D1 or the minor diameter of the external thread d1
- How to calculate the effective cross-sectional area (according to JIS B 1082)
- To find the screw thread engagement height of 5/8H
- To find the height H of the peak
- Lead angle
- Download Excel table
- Thread root diameter and how to find it
Standard Dimensions and Lead Angle Table for Metric Thread Designations
The above table is from JIS B0205-4 standard for M1 to M24Commonly used excerpts for effective screw diameter, thread height, pitch, and lead angle will be.
The Excel table provided in this article (at the end) is not mentioned above.
- M1.1
- M1.4
- M1.8
- M2.2
- M4.5
- M5.5
- M9
- M11
- M14
- __OPENROUTER_FAILED__
- M17
- M18
- M22
- M25
- M26
- M27
- M28
- M30
- M32
- M33
- M35
- M36
- M38
- M39
- M40
- M42
- M45
- M48
- M50
I am also listing these.
Thread root diameter and how to find it
The formulas for calculating the root diameter of each screw and the dimensions of other screws are as follows:
Names for each diameter used in screws
Pitch
H: Mount Togari's height (different from the overhang height)
Female thread valley diameter (nominal)
Female thread inner diameter
D2: Minor diameter of internal thread
Male thread outer diameter
d1: Male thread root diameter
Male thread effective diameter
Formula for calculating the effective diameter of a screw
Effective diameter D2 (d2)__OPENROUTER_FAILED__
The formula to calculate the minor diameter of the internal thread D1 or the minor diameter of the external thread d1
Female thread minor diameter D1 (male thread root diameter d1)=M Size - 1.082532 * P
How to calculate the effective cross-sectional area (according to JIS B 1082)
Effective cross-sectional area=0.7854*(M size-(0.9382*P))^2
To find the screw thread engagement height of 5/8H
Screw thread engagement height 5/8H = 0.541265877 * P
To find the height H of the peak
Peak height H = 0.866025404 × P
Lead angle
Lead angle of parallel threads (general screws)
The angle between a plane perpendicular to the axis of a screw and the helix of the screw thread.
Taper thread lead angle
The angle between a plane perpendicular to the axis of a screw and the helical path of the screw thread.
And it is the angle projected onto a plane perpendicular to the radial line of the screw passing through that point.
*Spiral line: The locus of points drawn along the "surface" of a cylinder or cone, where the ratio of axial movement to the angle of rotation around the axis is constant.
Lead angle calculation formula
The lead angle calculation formula is as follows:
tanφ = P / (2πr)
P: Lead (pitch)r: radius of the coiled wire (radius of the effective diameter)
Lead angle = tanφ*180/π
Download Excel table
Here is the Excel file for the "Standard Dimensions and Lead Angle Table for Nominal Metric Threads" that was created this time. Please feel free to use it.
That's it.
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Screws, taps, washers, inserts
Other reference For reference of bolt position. Bolt position with washers in mind.
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