0.000
MINIATURE SCREW THREADS (S)
Miniature Screw Thread Profile
- Thread form angle : 60°
- P : Pitch
- H : Height of fundamental triangle
- H1 : Height of thread on basic profile
- h3 : Height of external thread on design profile
- ac : Clearance between minor diameters on design profile
- D : Major diameter of internal thread
- D1 : Minor diameter of internal thread
- D2 : Pitch diameter of internal thread
- d : Major diameter of external thread
- d1 : Minor diameter of external thread on basic profile
- d2 : Pitch diameter of external thread
- d3 : Minor diameter of external thread on design profile
Miniature Screw Thread Tolerance
- T : Tolerance
- TD1, TD2 : Tolerance for D1, D2
- Td1, Td2 : Tolerance for d1, d2
- ES : Upper deviation of internal thread
- es : Upper deviation of external thread
- EI : Lower deviation of internal thread
- ei : Lower deviation of external thread
- G, H : tolerance positions for lower deviation of internal thread
- h : tolerance positions for upper deviation of external thread
(a) Example of internal thread S Profile : S0.9 x 0.225 - 4H5
- S : Miniature thread symbol
- 0.9 : Size
- 0.225 : Pitch
- 4H5 : Tolerance class
- 4H : Pitch diameter tolerance symbol. "4" : tolerance grade and "H" : tolerance position
- 5 : Minor diameter tolerance grade
For internal threads, there are four tolerance classes, 3G5, 3G6, 4H5 and 4H6.
(b) Example of external thread S Profile : S0.9 x 0.225 - 5h3
- S : Miniature thread symbol
- 0.9 : Size
- 0.225 : Pitch
- 5h3 : Tolerance class
- 5h : Pitch diameter tolerance symbol. "5" : tolerance grade and "h" : tolerance position
- 3 : Major diameter tolerance grade
For external threads, there is only one tolerance class, 5h3
Miniature Screw Thread Dimension
Height of fundamental triangle :
|
H = |
0 |
mm |
Height of thread on basic profile :
|
H1 = |
0 |
mm |
Height of external thread on design profile :
|
h3 = |
0 |
mm |
Clearance between minor diameters on design profile :
|
ac = |
0 |
mm |
Major diameter (mm)
0.000
0.000
=
invalid size
Minor diameter (mm)
0.000
0.000
0.000
=
invalid size
Pitch diameter (mm)
0.000
0.000
0.000
=
invalid size
For not specified tolerance, we use the pitch tolerance to calculate the average value.
Miniature Screw Thread Basic Designation
External Thread
S0.3x0.08 5h3
S0.35x0.09 5h3
S0.4x0.1 5h3
S0.45x0.1 5h3
S0.5x0.125 5h3
S0.55x0.125 5h3
S0.6x0.15 5h3
S0.7x0.175 5h3
S0.8x0.2 5h3
S0.9x0.225 5h3
S1x0.25 5h3
S1.1x0.25 5h3
S1.2x0.25 5h3
S1.4x0.3 5h3
Internal Thread
S0.3x0.08 3G5 , S0.3x0.08 3G6 , S0.3x0.08 4H5 , S0.3x0.08 4H6
S0.35x0.09 3G5 , S0.35x0.09 3G6 , S0.35x0.09 4H5 , S0.35x0.09 4H6
S0.4x0.1 3G5 , S0.4x0.1 3G6 , S0.4x0.1 4H5 , S0.4x0.1 4H6
S0.45x0.1 3G5 , S0.45x0.1 3G6 , S0.45x0.1 4H5 , S0.45x0.1 4H6
S0.5x0.125 3G5 , S0.5x0.125 3G6 , S0.5x0.125 4H5 , S0.5x0.125 4H6
S0.55x0.125 3G5 , S0.55x0.125 3G6 , S0.55x0.125 4H5 , S0.55x0.125 4H6
S0.6x0.15 3G5 , S0.6x0.15 3G6 , S0.6x0.15 4H5 , S0.6x0.15 4H6
S0.7x0.175 3G5 , S0.7x0.175 3G6 , S0.7x0.175 4H5 , S0.7x0.175 4H6
S0.8x0.2 3G5 , S0.8x0.2 3G6 , S0.8x0.2 4H5 , S0.8x0.2 4H6
S0.9x0.225 3G5 , S0.9x0.225 3G6 , S0.9x0.225 4H5 , S0.9x0.225 4H6
S1x0.25 3G5 , S1x0.25 3G6 , S1x0.25 4H5, S1x0.25 4H6
S1.1x0.25 3G5 , S1.1x0.25 3G6 , S1.1x0.25 4H5 , S1.1x0.25 4H6
S1.2x0.25 3G5 , S1.2x0.25 3G6 , S1.2x0.25 4H5 , S1.2x0.25 4H6
S1.4x0.3 3G5 , S1.4x0.3 3G6 , S1.4x0.3 4H5 , S1.4x0.3 4H6
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