|
进口ANPT螺纹塞规
美国Vermont Gage量规价格
苏州Vermont Gage量规总代理
NPT,PT,G 都是管螺纹. NPT 是 National (American) Pipe Thread 的缩写,属于美国标准的 60 度锥管螺纹,用于北美地区.国家标准可查阅 GB/T12716-1991 PT 是 Pipe Thread 的缩写,是 55 度密封圆锥管螺纹,属惠氏螺纹家族,多用于欧洲及英联邦国家.常用于水及煤气管行业,锥度规定为 1:16. 国家标准可查阅 GB/T7306-2000 G 是 55 度非螺纹密封管螺纹,属惠氏螺纹家族.标记为 G 代表圆柱螺纹.国家标准可查阅 GB/T7307-2001 另外螺纹中的1/4、1/2、1/8 标记是指螺纹尺寸的直径,单位是英吋.行内人通常用分来称呼螺纹尺寸,一吋等于8分,1/4 吋就是2分,如此类推. G 就是管螺纹的统称(Guan),55,60度的划分属于功能性的,俗称管圆。即螺纹由一圆柱面加工而成。 ZG俗称管锥,即螺纹由一圆锥面加工而成,一般的水管接头都是这样的,国标标注为Rc 公制螺纹用螺距来表示,美英制螺纹用每英寸内的螺纹牙数来表示,这是它们最大的区别, 公制螺纹是60度等边牙型,英制螺纹是等腰55度牙型,美制螺纹60度。 公制螺纹用公制单位, 美英制螺纹用英制单位。 管螺纹主要用来进行管道的连接,其内外螺纹的配合紧密,有直管与锥管两种。公称直径是指所连接的管道直径,显然螺纹直径比公称直径大。1/4,1/2,1/8是英制螺纹的公称直径,单位是英寸。、 从设计角度来说,螺纹副旋合后,在基面距内应形成无隙结合。实际上各直径、牙型角、螺距和锥角在制造中都有偏差。NPT螺纹的牙顶和牙底为过渡配合,仅靠板紧螺纹副时的微量变形来达到100%的无隙量是不可能的。为了确保其密封性能,往往需要螺纹副内加一定的密封介质,它主要适应于中低压系统。NPTF螺纹的牙顶和牙底为过盈配合,扳紧螺纹副后,窄平的牙底迫使尖的牙顶弹塑性变形,因而获得100%的过盈配合,无需密封介质即能阻止泄漏,适于高压系统 大径、小径不同 NPTF螺纹与NPT螺纹的螺距P、基面距L1、基面上的中径d2均相同,大径、小径的计算方法也相同,但因两者牙高不同,所以大径小径并不相同。以东方红LF拖拉机上1/2-14 NPTF标准快换接头座螺纹为例: 已知:P=1.814 mm,L1=8.13 mm,d2=19.772 mm,若按NPT螺纹计算,则基面上 d大径=d2+0.8P=21.223 mm d小径=d2-0.8P=18.321 mm 按照NPTF螺纹计算,则基面上 d大径=d2+0.746P=21.125 mm d小径=d2-0.746P=18.419 mm 由此看出,两者的大小径是有区别的。 螺纹代号Thread Code 一、英制螺纹(螺纹牙型角55度)Thread of British standard ( Thread pitch shape angle 55°) BSW----英国标准惠氏螺纹(粗牙)British Standard Whitworth Thread ( Coarse ) BSF----英国标准惠氏螺纹(细牙)British Standard Whitworth Thread ( Fine ) G----直管螺纹(外螺纹分A、B两面级、丝锥分G、G-D)Straight pipe thread ( Outside ) thread in A\B: taps in G、G-D ) R----锥管外螺纹(旧代号ZG;KG)Outside paper pipe thread ( Old thread code ZG,KG ) RC----锥管内螺纹(旧代号ZG;KG)Inside taper pipe thread ( Old thread code ZG,KG ) 二、美制螺纹(螺纹牙型角60度)Thread of American standard ( Thread pitch shape angle 60° UNC----统一制粗牙螺纹(代替NC)Unified coarse pitch thread ( Instead of NC ) UNF----统一制细牙螺纹(代替NF)Unified fine pitch thread ( Instead of NF ) UNEF----统一制超细牙螺纹Unified superfine pitch thread UN-----统一制不变螺距螺纹Unified thread UNS----统一制特殊螺纹Unified Special thread NPT----一般用途锥管螺纹(旧代号Z;K)Taper pipe thread for general purpose ( Old thread code Z,K ) NPSC----管接头直管内螺纹Internal straight pipe thread for connection NPSM----设备上自由配合,机械连接用直管螺纹Straight pipe thread for general purpose NPTF----干密封锥管螺纹Dryseal taper pipe thread NPSF----干密封燃油直管螺纹Dryseal straight pipe internal thread NGT----气瓶用锥螺纹Special thread for gas cylinder 三、米制螺纹Metric thread ZM-----米制锥管螺纹 Metric taper pipe thread 四、其它螺纹Other threads SM----缝纫机螺纹Thread for sewing machine PZ----气瓶用锥螺纹Special thread for gas cylinder 5V1-20V1-气门芯螺纹5V1-20V1-Tyre valve thread 螺纹代号说明示例:Explanation of thread code. e. g. 1/4-20UNC 1/4-公称直径1/4" nominal dia. 1/4" 20-每寸20牙twenty teeth per inch UNC-美标统一制粗牙螺纹unified coarse pitch thread ( American standard 谈谈美制密封锥管外螺纹的代号有哪些 美制密封锥管外螺纹的代号:NPT,NPTF NPT代表美国标准管螺纹(National Pipe Tapered) ,NPTF则是干密封式美国标准管螺纹。 两者基本牙型是一样的,不同点是: 螺纹牙高不一样。NPT可能有过盈也可能有间隙,但NPTF没有间隙; NPT内外螺纹均为圆锥,而NPTF外螺纹是圆锥,内螺纹则有圆锥、圆柱两种; NPT有右旋也有左旋,NPTF只有右旋一种旋向。 RC 是英制密封内螺纹代号,R是英制密封外螺纹代号,NPT是美制密封螺纹代号 NPT是密封圆锥管螺纹。NPSC是密封圆柱内螺纹。 NPT是美标锥形密封螺纹 密封性差一点 NPTF是美标锥形干密封螺纹 二者差异很小,精度等级要高很多,一般不用。 NPT和NPTF螺纹是两种美国最常用的锥管螺纹。应用范围从电线管道和扶手到运送煤气或腐蚀性液体的高压管线。NPT用于机械的或者低压的气体和液体,要求使用密封剂来保证密封。当密封要求严格时,密封剂可能由于高温高压会失效,这时可以采用NPTF干密封螺纹。当用扳手上紧配件时,这种机械密封会在螺纹配合和轻微的变形来生成密封效果。 这两种螺纹在目测时是相同的。两种在一英尺的长度上都有3/4的锥度。在内螺纹的孔的顶端或者外螺纹的管的端部拥有相同的中径,而且拥有相同的螺纹长度和深度。尽管如此,在螺纹牙型上还是有细微的差别。两螺纹的大直径和小直径上有细微的差别。对于NPT螺纹,使用扳手上紧后,在大直径和小直径上可能允许装配后漏气,因此会使用密封剂来填充所有的间隙。另一方面,NPTF螺纹的设计用于保证在整个牙形上产生足够的变形以生成这种机械密封。 牙型的不同如何影响使用的工具来生产NPT和NPTF螺纹?NPT和NPTF螺纹牙形都是采用丝锥来生产每种螺纹。因为NPT螺纹零件要求密封剂,用NPTF丝锥在攻NPT螺纹是可以接受的。但是NPT丝锥不能用于NPTF螺纹,因为它生产的螺纹会漏气。 最大的不同是这两种螺纹的检查要求。因为NPT螺纹要使用密封剂,只要用一个塞规,大家叫L1规(内螺纹)或L1环规(外螺纹)来检查尺寸。但是,因为锥度和大直径,小直径对NPTF螺纹的密封很重要,因此要求其他的螺纹验规L2和L3规,大直径和小直径要用特殊的塞规或环规来检验。 |
ANPT Thread Plug Gages
§
ANPT plug gages available in L1, L3 and 6 step
§
L-1 thread plug which checks the thread elements within
hand tight engagement
§
L-3 thread plug which checks the threads that will be
engaged when wrench tight
§
6-Step plain plug which is used to check the minor
diameter of the female fitting.
§
Aeronautical National Form Taper Pipe Thread Plug Gages
per SAE AS71051
§
Manufactured to the high end of the specification for
longer wearability
NPT vs ANPT
THREAD DESIGN
The requirements for NPT (National Pipe
Taper) screw threads are spelled out in ANSI B1.20.1
The requirements for ANPT (Aeronautical National Pipe Taper) screw threads are
spelled out in ANSI SAE AS71051
The NPT and ANPT product screw threads in
the sizes up to and including 2 inches are identical. Beginning at 2-1/2 inches
NPT and ANPT product screw threads are NOT identical. Beginning at 2-1/2 inches
the wrenching length of the coupling is different between NPT and ANPT product
screw threads. NPT has 2 threads and ANPT has 3 threads. There are major
differences in the gages.
PRODUCT ASSEMBLY
NPT and ANPT screw threads are designed to
screw together. In most cases there will be no interference between the root
and crest of the threaded at assembly. The tapered screw thread is designed to
be assembled with some form of sealant to assure a leak free joint.
NPTF screw threads will screw together with both NPT and ANPT screw threads and
should have no noticeable assembly problem. There will most likely be an
interference fit between the root and crest on either the major or minor
diameter of the screw thread, depending on which part is NPTF. To accomplish a
seal on the joint, a sealant will be required.
GAGE REQUIREMENTS
Both NPT and ANPT screw threads have a
requirement for an L1 gage. The gage is called L1 because it relates to the L1
dimension in the screw thread specification. Even though the L1 requirement is
identical for both NPT and ANPT product screw threads, the tapered pipe screw
thread gages are different at either the major diameter or the minor diameter.
From my quick survey of the two standards I found: the ANPT-L1 tapered pipe
screw thread plug gage major diameter was larger than the NPT major diameter;
the ANPT-L1 tapered pipe screw thread ring gage minor diameter was larger than
the NPT minor diameter. All other L1 gage parameters are identical between the
NPT-L1 and ANPT-L1 gages. Technically; the NPT-L1 and the ANPT-L1 gages are not
fully interchangeable.
The NPT screw thread standard only defines
a L1 ring gage for the male thread and a L1 plug gage for
the female thread. Both gages measure the hand tight L1 length of the screw
thread.
There are no such NPT tapered pipe screw
thread gages: L2; L3 or 6-Step Crest Check. If you have NPT tapered pipe screw
thread gages marked: L2; L3 or 6-Step Crest Check, they are really ANPT gages
which have been inappropriately remarked to meet a customer's demand. The gage
maker should have educated the customer instead of supplying the incorrectly
marked taper pipe screw thread gages. If these inappropriately marked taper
pipe screw thread gages were sent to a calibration laboratory, the calibration
laboratory should return the gages without calibration because there is no
standard which defines the gages.
If your NPT product design requirements
indicate additional measurements must be taken, consider changing the product
requirement to ANPT per ANSI SAE AS71051. Because the majority of the taper
pipe screw thread applications will be 2 inches or less; and because the NPT
and ANPT product screw threads in the sizes up to and including 2 inches are
identical; this should present no problems with the end product. If your
product is over 2-1/2 inches some design consideration should be conducted.
ANPT requires: both L1 and L2 ring gages for
the male thread; both L1 and L3 plug gages for the female thread; and
Crest Check (frequently called 6-step) gages for both the internal or external
thread.
管螺纹量规详细规格如下:
1/8″-27 NPT |
1/4″-18 NPT |
3/8″-18 NPT |
1/2″-14 NPT |
3/4″-14 NPT |
1″-11.5 NPT |
1 1/4″-11.5 NPT |
1 1/2″-11.5 NPT |
2″-11.5 NPT |
2 1/2″-8 NPT |
3″-8 NPT |
3 1/2″-8 NPT |
4″-8 NPT |
5″-8 NPT |
6″-8 NPT |
1/8″-27 NPSI |
1/4″-18 NPSI |
3/8″-18 NPSI |
1/2″-14 NPSI |
3/4″-14 NPSI |
1″-11.5 NPSI |
1 1/4″-11.5 NPSI |
1 1/2″-11.5 NPSI |
2″-11.5 NPSI |
2 1/2″-8 NPSI |
3″-8 NPSI |
3 1/2″-8 NPSI |
4″-8 NPSI |
5″-8 NPSI |
6″-8 NPSI |
1/8″-27 NPSF |
1/4″-18 NPSF |
3/8″-18 NPSF |
1/2″-14 NPSF |
3/4″-14 NPSF |
1″-11.5 NPSF |
1 1/4″-11.5 NPSF |
1 1/2″-11.5 NPSF |
2″-11.5 NPSF |
2 1/2″-8 NPSF |
3″-8 NPSF |
3 1/2″-8 NPSF |
4″-8 NPSF |
5″-8 NPSF |
6″-8 NPSF |
1/8″-27 NPSM |
1/4″-18 NPSM |
3/8″-18 NPSM |
1/2″-14 NPSM |
3/4″-14 NPSM |
1″-11.5 NPSM |
1 1/4″-11.5 NPSM |
1 1/2″-11.5 NPSM |
2″-11.5 NPSM |
2 1/2″-8 NPSM |
3″-8 NPSM |
3 1/2″-8 NPSM |
4″-8 NPSM |
5″-8 NPSM |
6″-8 NPSM |
1/8″-27 ANPT |
1/4″-18 ANPT |
3/8″-18 ANPT |
1/2″-14 ANPT |
3/4″-14 ANPT |
1″-11.5 ANPT |
1 1/4″-11.5 ANPT |
1 1/2″-11.5 ANPT |
2″-11.5 ANPT |
2 1/2″-8 ANPT |
3″-8 ANPT |
3 1/2″-8 ANPT |
4″-8 ANPT |
5″-8 ANPT |
6″-8 ANPT |
1/8″-27 NPTF |
1/4″-18 NPTF |
3/8″-18 NPTF |
1/2″-14 NPTF |
3/4″-14 NPTF |
1″-11.5 NPTF |
1 1/4″-11.5 NPTF |
1 1/2″-11.5 NPTF |
2″-11.5 NPTF |
2 1/2″-8 NPTF |
3″-8 NPTF |
3 1/2″-8 NPTF |
4″-8 NPTF |
5″-8 NPTF |
6″-8 NPTF |
BSPT 1/16″-28 |
BSPT 1/8″-28 |
BSPT 1/4″-19 |
BSPT 3/8″-19 |
BSPT 1/2″-14 |
BSPT 3/4″-14 |
BSPT 1″-11 |
BSPT 1 1/4″-11 |
BSPT 1 1/2″-11 |
BSPT 2″-11 |
BSPT 2 1/2″-11 |
BSPT 3″-11 |
BSPT 4″-11 |
BSPT 5″-11 |
BSPT 6″-11 |
BSPP G1/8×28 |
BSPP G1/4×19 |
BSPP G3/8×19 |
BSPP G1/2×14 |
BSPP G5/8×14 |
BSPP G3/4×14 |
BSPP G7/8×14 |
BSPP G 1×11 |
BSPP G1 1/8×11 |
BSPP G1 1/4×11 |
BSPP G1 1/2×11 |
BSPP G1 3/4×11 |
BSPP G2x11 |
BSPP G2 1/4×11 |
BSPP G2 3/4×11 |
BSPP G3x11 |
BSPP G3 1/2×11 |
BSPP G4x11 |
BSPP G4 1/2×11 |
BSPP G5x11 |
BSPP G5 1/2×11 |
BSPP G6x11 |
苏州斯文克精密测量设备有限公司期待您的咨询,我们将热诚为你服务。