螺纹代号
thread symbol
螺纹thread
参考标准
reference standard
牙型角
thread angle
m
公制螺纹
粗牙系列coarse series
iso68gb196
60°
metric screw threads
细牙系列fine series
iso724gb196
s
小螺纹miniature screw threads
iso1501gb/t15054
unc
统一螺纹
unified threads
粗牙系列coarse series
ansi b 1.1
unf
细牙系列fine series
unef
特细牙系列
extra-fine series
uns
特殊直径、螺距、衔接长度系列
special diameter\pitch length of engagmentand
un
等螺距系列
constant-pitch series
tr
公制梯形螺纹
metric trapezoidalscrew threads
iso2904gb5796
30°
tm
30梯形螺纹
30trapezoidalscrew threads
r
螺纹密封的管螺纹
pipe threads where pressure-tight joints are made on the threads
锥管内螺纹
taper external screw threads
iso/r7gb7306
55°
1/16 taper
rc
锥管外螺纹
taper internal screw threads
rp
直管螺纹
parallel internal pipe threads
55°
g
非螺纹密封的管螺纹
pipe threads where pressure-tight joints are not made on the threads
iso/r228gb7307
npt
通用美标锥管螺纹
american standards taper pipe threads for general use
ansi/asem b1.20.1gb/t12716
60°
1/16 taper
npsc
美标直管接头螺纹
american standards striaght pipe threads in pipe coupling
ansi/asem b1.20.1
60°
npsm
美标直管机用自由配合接头联接螺纹
american standards striaght pipe threads for free-fitting mechanical joints for fixtures
nptf
美标燃料直管内螺纹
dryseal american standards fuel internal straight pipe threads
ansi b1.20.3
60°
1/16 taper
npsf
美标锥管气密螺纹
dryseal american standards taper pipe threads
60°
ba
英标联接螺纹
british association threads
bs93
47°30〃
bsc
英标自行车螺纹
british standards cycle threads
bs811
60°
bsw
英标惠氏螺纹
british standards whitworth threads
bs84
55°
bsf
英标细牙螺纹
british standards fine threads
bsmo
英标显微镜螺纹
british standards microscope objective threads
bs3569
fg
(德国)自行车螺纹
(germany)cycle threads
din79013
60°
pg
(德国)薄钢管螺纹
(germany)steel conduit threads
din40430
80°
美国取消对华环状焊接碳素钢管的反补贴行政复审中材国际决定终止钢贸业务浅谈钢材的热轧状态西方对中国紧固件企业施加单一反倾销税率的风险还在不锈钢软化措施中国紧固件未给欧洲带来损害汽车零部件再制造扩大试点范围中国模协为横沥模具产业献计献策