Quality Control

Thread Standards

UNF Thread Connection

Unified threads according to ISO 68, ANSI B1.1

Male :
i.e. 9/16"-18 UNF
Femle :
i.e. 7/16"-20 UNF
Female, SEA O-Ring
UNF Thread Connection UNF Thread Connection
Metric Thread Connection

Metric threads according to ISO 68/ISO 724

Male :
i.e. M16x1.5
Femle :
i.e. M16x1.5
Metric Thread Connectio Metric Thread Connectio
R/Rc Thread Connection

Conical Pipe Thread Connection According to ISO 7/1 (other common descriptions are BSPT, Kr)

Male :
i.e. R 1/4"
Femle :
i.e. Rp 1/4" (parallel)
i.e. Rc 1/4" (taper)
R/Rc Thread Connection R/Rc Thread Connection
G Thread Connection

Cylidrical Pipe Thread Connection According to ISO 228/1 (other common descriptions are BSP, R)

Male :
i.e. G 1/4"
Femle (ISO 1179):
i.e. G 1/4"
G Thread Connection G Thread Connection
NPT Thread Connection

National Pipe Thread American Standard According to ANSI/ASME B 1.20.1

Male :
i.e. 1/4" NPT
Femle :
i.e. 1/4" NPT
NPT Thread Connection NPT Thread Connection
Furthermore , An ISO 9001:2008 accredited organization by TUV SUD, we achieve high quality standard through in-house measuring systems with a well equipped Standard Room that include,
  • Profile projector - Mitutoyo (PJ-A3010)
  • Contour measuring instrument - Mitutoyo (Contracer CV 3200)
  • Roughness tester - Mitutoyo
Quality techniques executed:
  • SPC
  • 8D
  • Why-Why Analysis


VERTEX INDUSTRIES uses several different material in its products, depending on media and environment demands. Our fitting components are offered in STEEL, BRASS. Cold drawn finished bar stock is machined to produce the straight fittings. Close grain forgings are used for machining the shaped bodies.

Brass Grades

British Standard European Designation European Number USA Spec Indian Standard
CZ 108 CuZn37 CW508L C27200 Is 4413/81
CZ 109 CuZn40 CW509L C28000 Is 4170/67
CZ 112 CuZn36n1Pb CW712R C46400 Is 291/89 Grade l
CZ 121 CuZn39Pb3 CW614N C37710 Is 319/89 Grade l
CZ 122 CuZn40Pb2 CW617N C37700 --
CZ 124 CuZn36Pb3 CW603N C36000 Is 319/89 Grade ll
CZ 128 CuZn38Pb2 CW608N C38500 --
CZ 128 CuZn39Pb2 CW612N C37710 --
CZ 132 CuZn36Pb2As CW602N C35330 --

Stainless Steel Grades

X12CrMnNiN18-9-5 1.4373 S20200 202 SUS202 S35450
X10CrNiS18-9 1.4305 S30300 303 SUS303 S30317
X2CrNi19-11 1.4306 S30403 304L SUS304L S30403
X2CrNi18-9 1.4307,[1.4306] S30403 304L SUS304L S30403
X5CrNi18-9 1.4301 S30400 304 SUS304 S30408
X2CrNiMo17-12-2 1.4404 S31603 316L SUS316L S31603
X5CrNiMo17-12-2 1.4401 S31600 316 SUS316 S31608