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- Acem螺纹规│Stub Acme螺纹规
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- Wrentham Tool Group
- Meyer Gage针规、梅尔量规
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- Microset 复制胶
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- Michigan Spline Gage Co
- Southwest Calibration Service
- McCord and Company
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GSG螺纹量规
GSG螺纹规价格
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苏州GSG螺纹规
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United States, Canada, and United Kingdom use the Unified of Unified Inch profile, in accordance with the Unified and American Screw Threads – ASA B1.1-1989.
UNC – Unified National Coarse
UNF – Unified National Fine
UNEF – Unified National Extra Fine
UNS – Unified National Special
UNR – Unified National Round (round root)
ISO – International Standards Organization (metric)
Two major Unified thread series are in use: UN and UNR. For the UN series, you specify C
(coarse), F (fine), or EF (extra fine), as required. For the UNR series, the root radius must also be specified.
The UNR series screws are better for fatigue because the root radius reduces stress concentrations. The
basic thread geometry for ISO and Unified threads is shown below.
Thread Standards and Definitions
Pitch (p) – The distance between adjacent thread forms measured parallel to the thread axis.
Lead (L) – The distance the nut moves parallel to the screw axis when the nut is given one turn.
TPI (n) – The number of Threads Per Inch, related to the pitch by p = 1/n.
Root (minor) Diameter – Smallest diameter of screw - dr.
Major Diameter – Largest diameter of screw - dc (sometimes designated as d).
Mean (pitch) Diameter – Average diameter of screw - dm (sometimes designated as dp).
Lead Angle (λ) – The angle defining the inclination of the thread (see figure below).
Helix Angle (ψ) – The angle between the thread axis and the lead angle (ψ + λ = 90o).
UNC – Unified National Coarse
UNF – Unified National Fine
UNEF – Unified National Extra Fine
UNS – Unified National Special
UNR – Unified National Round (round root)
ISO – International Standards Organization (metric)
Two major Unified thread series are in use: UN and UNR. For the UN series, you specify C
(coarse), F (fine), or EF (extra fine), as required. For the UNR series, the root radius must also be specified.
The UNR series screws are better for fatigue because the root radius reduces stress concentrations. The
basic thread geometry for ISO and Unified threads is shown below.
Thread Standards and Definitions
Pitch (p) – The distance between adjacent thread forms measured parallel to the thread axis.
Lead (L) – The distance the nut moves parallel to the screw axis when the nut is given one turn.
TPI (n) – The number of Threads Per Inch, related to the pitch by p = 1/n.
Root (minor) Diameter – Smallest diameter of screw - dr.
Major Diameter – Largest diameter of screw - dc (sometimes designated as d).
Mean (pitch) Diameter – Average diameter of screw - dm (sometimes designated as dp).
Lead Angle (λ) – The angle defining the inclination of the thread (see figure below).
Helix Angle (ψ) – The angle between the thread axis and the lead angle (ψ + λ = 90o).
Thread Classifications: There are three classes of thread fit;
Loose (where the joint is frequently disassembled) – Class 1
Standard (general assembly) – Class 2
Close (high accuracy, fine fits) – Class 3
Designations for each class and the type of thread (inside or outside) for Unified and Metric are given above.
Loose (where the joint is frequently disassembled) – Class 1
Standard (general assembly) – Class 2
Close (high accuracy, fine fits) – Class 3
Designations for each class and the type of thread (inside or outside) for Unified and Metric are given above.
Nomenclature: Examples of the nomenclature for specifying a threaded fastener are given below for Unified National and Metric specifications.
GSG螺纹量规制造厂是全美最大的非标量规制造商，提供全系列的非标量规设计解决方案，可以根据图纸，根据参数、根据客户的要求设计、制造量规，深受欧美企业的一致好评，苏州斯文克精密测量设备有限公司作为美国GSG量规的中国区代理商，销售各类量规，部分常用量规备有库存，期待您的咨询。