螺紋限界牙規
螺紋用限界牙規為限定相同之規格和等級，其螺紋以通端和止端2個限界方式來做檢查。以前JIS牙規方式其止端因使用的目的分別有工作用和檢查用，ISO方式則無分別。製品之螺紋依規定的嵌合長度，通端規能順利旋轉而通過螺紋的全長，止端規以任何一端檢查須在2回轉以內(ANSI規格為3回轉以內)如超過則該螺紋為檢查不合格，如在規定的回轉數內為合格。
To determine thread standard and class of screw thread limit gauges, threads are tested by the two limit method GO and NO GO system. For the NO GO side there is a specified JIS method and standard, but no ISO classification.
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被檢查之螺紋 |
ISO等級之牙規 |
以前JIS之牙規 |
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種類 |
記號 |
種類 |
記號 |
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外螺紋 External thread
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有效徑 Pitch diameter |
通端環牙規 GO screw ring gauge
止端環牙規 NO GO screw ring gauge |
GR
NR |
通端環牙規(工．檢)
工作用止端環牙規 NO GO screw ring gauge formachinework
檢查用止端環牙規 NO GO screw ring gauge for inspection |
GR
WR
IR |
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外徑 Majordiameter |
外徑用通端環規 Plain GO ring gauge for major diameter
外徑用止端環規 Plain NO GO ring gauge for major diameter
外徑用板形測徑規 Plaincallipergauge for major diameter |
PR通端
PR止端 PR NO-GO
PC |
工作用限界板形測徑規 Limitsnapgauge formachinework
檢查用限界板形測徑規 Limit snap gaugefor inspection |
WS
IS |
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內螺紋 Internal thread
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有效徑 Pitch diameter |
通端螺紋柱規 GO screw plug gauge
止端螺紋柱規 NO GO screw plug gauge |
GP
NP |
通端螺紋柱規(工．檢)
工作用止端螺紋柱規 NO GO screw plug gauge for machine work
檢查用止端螺紋柱規 NO GO screw plug gauge for inspection |
GP
WP
IP |
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內徑 Minor diameter |
內徑用柱規 Plain pulg gauge for minor diameter |
PP |
工作用限界柱規 Limitpluggauge formachinework
檢查用限界柱規 Limitpluggauge for inspection |
WM
IM |
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螺紋限界牙規及點檢用牙規之公差相互關係位置說明圖
Mutually related positions of external screw thread and internal screw thread limit
gauge and gauge for checking explanation figure.
例M3x0.5 6H, 6g 及JIS Ⅱ
Example M3x0.5 for ISO 6H 6g and current JIS class Ⅱ .
