在定制螺纹量规时,首先要确认是哪个国家的螺纹标准,这个是从源头上遏制产生错误的重要方法,很多时候很多人都想当然的认为只要是M制的螺纹规,都是通用的,这个是错误的,每个标准对每种螺纹和检验方法 都有明确的规定。苏州斯文克精密测量设备有限公司可以提供国产螺纹规定制服务,按照客户的要求订购螺纹量规。比如我们比价擅长定制美标的螺纹量规,美标ACME爱克母量规等。对于国际上主要有以下几种类别的螺纹标准:中国:GB、德国:DIN、法国:NF、日本:JIS、俄罗斯:GOST、美国:ASME、英国:BS、欧洲:基本都用ISO的米制普通螺纹、国际标准:ISO。在当今世界上ISO和美国ASME标准比较盛行。
1.中华人民共和国国家标准:螺纹:术语(GB/T 14791-2013)(ISO 5408:2009)》代替GB/T 14791—1993,与其相比,主要技术变化为:“原始三角形”与“基本牙型”的关系:1993年版由“原始三角形”导出“基本牙型”;本标准由“基本牙型”导出“原始三角形”;“牙侧”定义:1993年版没有限定牙侧的形状;本标准限定牙侧在轴线平面内为直线形;“作用中径”定义:1993年版没有明确假想螺纹包容实际螺纹的位置;本标准明确规定假想螺纹包容实际螺纹的位置在“牙侧”处等。
2.美国标准螺纹(American Standard Thread):
螺纹顶部与根部皆为平面,强度较佳。螺纹角亦为60度,规格以每英吋有几牙表示。此种螺纹可分为粗牙(NC);细牙(NF);特细牙(NEF)三级。表示法如1/2-10NC。(1/2:外径;10:每吋牙数;NC代号)。
3.国际公制标准螺纹(International Metric Thread System):
我国国家标准CNS采用之螺纹。牙顶为平面,易于车削,牙底则为圆弧形,以增加螺纹强度。螺纹角为60度,规格以M表示。公制螺纹可分粗牙及细牙二种。表示法如M8x1.25。(M:代号、8:公称直径、1.25:螺距)。
4.统一标准螺纹(Unified Thread):
由美国、英国、加拿大三国共同制订,为目前常用之英制螺纹。螺纹角亦为60度,规格以每英吋有几牙表示。此种螺纹可分为粗牙(UNC);细牙(UNF);特细牙(UNEF)。表示法如1/2-10UNC。(1/2:外径;10:每吋牙数;UNC代号)
5.管用螺纹(Pipe Thread):
为防止泄漏用的螺纹,经常用于气体或液体之管件连结。螺纹角为55度,可分为直管螺纹代号为”P.S.、N.P.S.” 和斜管螺纹代号为”N.P.T.”,其锥度为1:16,即每呎3/4吋。
6.惠式螺纹(Whitworth Thread):
常见管螺纹:
1.美制管螺纹(布氏螺纹)。牙型角60°,单位为英寸。NPT是National (American) Pipe Thread 的缩写,是圆锥管螺纹(内或外),锥度1:16。NPSC 是圆柱内螺纹。用于北美地区,国标查阅 GB/T12716-2002.
2.英制管螺纹(源于英国惠氏螺纹)。BSP为英制管螺纹总体代号,但是分为三种BSPP、 BSPT和 BSPF.
BSPP (British Standard Pipe Parallel (Thread)) 为英制圆柱管螺纹代号,只有内螺纹,相当 于国内的55°圆柱(平行)管螺纹,即Rp (老代号为G)。
BSPT (British Standard Taper Pipe Thread)是英制圆锥管螺纹代号,螺纹具有1:16的锥度, 相当于国内的55°圆锥管螺纹,即Rc (老代号为ZG)。
BSPF (British Standard Pipe Fine Hand Taps) 为英制细牙管螺纹。前面两者用于密封接合, 后边一种用于一般的接合。
英制管螺纹多用于欧洲及英联邦国家(欧洲国家多用柱/锥管螺纹副),常用于水及煤气管行业, 国标查阅GB/T7306-2000。
3.G是55°非螺纹密封管螺纹,属于惠氏螺纹家族。标记为G代表圆柱螺纹。国标查阅 GB/T7307-2001。
管螺纹的标注
1.密封管螺纹:
圆柱内螺纹与圆锥外螺纹的标准GB/T7306. 1-2000; 圆锥内螺纹与圆锥外螺纹的标准.
GB/T7306. 2-2000;
(1)、圆锥外螺纹特征代号:
与圆柱内螺纹配合(旋合)的圆锥外螺纹特征代号为: R1,如R13;与 圆锥内螺纹 配合(旋合)的圆锥外螺纹特征代号为: R2, 如R23;
(2)、圆锥内螺纹的特征代号为: Rc,如 Rc3/4;
圆柱内螺纹(55 度管螺纹)的特征代号为: Rp,如Rp3/4。(3)、 内外管螺纹只有一种 公差带代号,因此省略不标。
(4)、 螺纹副:尺寸代号只注写一次。如Rc/R23/4,Rc只
能和R2旋合;Rp/R13/4,Rp只能和R1旋合;
(5)、 左旋时加LH.
2.非密封管螺纹
完整标记由螺纹特征代号(G), 螺纹尺寸代号,中径公差等级代号和旋向代号组成.对圆柱内螺 纹,其中径公差等级代号省略不标;而圆柱外螺纹的中径公尺等级代号分别为A和B. 左旋螺纹的旋向代号为LH;右旋螺纹的旋向代号省略不标.当 表示英制非密封管螺纹的螺纹副 时,仅标注外螺纹的标记代号.示例:
尺寸代号为2的右旋,非密封圆柱内螺纹: G2尺寸代号为3的A级,右旋,非密封圆柱外螺纹: G3A尺寸代号为4的B级,左旋,非密封圆柱外螺纹: G4 B-LH
尺寸代号为2的右旋,非密封圆柱内螺纹与A级圆柱外螺纹组成的螺纹副: G2A
ACME – Standard & special - General,
Centralizing, Centralizing Stub, Stub, Stub Mod 1 & 2 and gages
ANSI– Standard
& special American National Standard threads, All classes, product &
gages (old N,NC,NF,NEF & NS Standards)
BUTTRESS–Standard & special American & British gage &
product threads
BSI–55°
parallel pipe thread gage & product threads to ISO standards
BSW– 55°
Whitworth standard & special gage & product threads
BTPT–55° standard taper pipe thread gage & product threads to ISO
standards
ISOMET–Standard
& special Metric product threads to B1.13M & J threads to B1.21M, gages
to ISO1504
MEASURE–Measurement
of all types of pressure angle threads, includes parallel & tapered threads
METRIC–
Standard & special Metric gage & product threads to ASME standards–
Metric STI gages
PIPETHRD–Standard American National taper pipe thread gage &
product threads
STIGAGE–Unified
standard & special thread insert working plug gages, all classes &
diameters
STUB60°–Standard
& Special 60° Unified stub threads to ASME B1.1 & Mil standards
TR–Standard
& Special Trapezoidal product and gage threads to ISO
standards
UNIFIED–Standard
& special product threads to ASME B1.1 and gages to ASME B1.2
UN2003–Standard
& special Unified product and gage threads to ASME B1.1 – 2003
VOGEL–Lead
angle compensation measurements for all equal pressure angle, single or
multiple start threads
- Phase
II hardness surface coating ultrasonic and boresopes
- PMC Lonestar API and thread gages
- Precision
Granite USA granite surface plates and accessories
- Precision Instruments torque wrenches
- Renishaw cmm probe systems and stylii
- Rex
Gauge mechanical and electronic durometers
- S-T
Industries optical comparators and dial dynamometers
- Starrett
precision measuring tools and webber gage blocks
- Scienscope microscope and video
inspection
- Shimpo America force gages and
stroboscopes
- Solartron analog probes digital probes and LVDT’s
- Sterling Manufacturing precision tooling and gaging systems
- Swiss Precision Instruments (SPI) precision
measuring tools
- Sylvac
SA electronic measuring tools and systems
- Takikawa Engineering laser scanning
micrometers
- TAL Technologies Inc. data acquisition
software
- Tesa precision measuring tools
- Thread Check precision thread gages
and software
- Toolmex measuring tools and
workholding devices
- Trimos SA calibration devices and
height gages
- Tru-Stone granite surface plates
and granite accessories
- Van Keuren (PMC) optical flats and parallels
- Vermont
Gage plain plug, ring, pin and thread gages
- Visual
Precision optical comparator overlay charts and screens
- Wyler
AG spirit and electronic levels and leveling systems
- Barcor
Inc. chamfer, countersink, hole, angle and rivet gages
- Bowers Metrology mechanical and digital
bore gages
- Brencor
/ ATI chamfer, countersink, hole gages
- Brown and Sharpe precision measuring
tools
- Carbide Probes CMM styli, dial gage
contact points
- Chicago Dial Indicator (CDI) electronic dial
indicators
- Craftsman Industries collet holders and
workholding devices
- CV Instruments hardness testers
- Dorsey Metrology precision measuring tools
- Dyer Gage precision measuring tools
- Eclipse magnetic tools and supplies
- Flexbar
Machine industrial tools and supplies
- Fowler
high precision tools and measuring instruments
- Frank Cox Sales special thread gages
- Gar Electroforming microfinish surface
comparators
- Hagenhoff LLC vyndicator wireless test
indicators
- Helios electronic and mechanical
hand tools
- Hemco
Gage thread gages
- I&R Partners spc data collection and software
- Indi-Square squareness and
straightness testers
- INSIZE
precision measuring tools
- LW qmsoft calibration software
- Magnescale measuring tools and
devices
- Major Micro Systems SPC Express Software
- Mahr
Federal precision measuring tools
- Marcel Aubert centering microscopes and optical devices
- Mercury Gage (PMC) thread gages and
special products
- Meyer
Gage plain plug and ring gages
- Midwest
Flex gage interfaces and multiplexers