with conical thread

GN 743.7 Oil level sight glasses

Oil level sight glasses GN 743.7 thumbnail

Type

A	with contrast screen
B	without contrast screen

d₁	d₂ Male thread conical	a Datum plane	d₃ at a	d₄ Female thread cylindrical	conical	e	l₁	l₂	l₃ Usable thread length	s	p Thread pitch
11	R 3/8	6,4	16,7	Rp 3/8	-	22	13	6	10,1	19	1,34
11	3/8 NPT	6,1	17,1	-	3/8 NPT	22	15	6	-	19,1	1,41
14	R 1/2	8,2	21	Rp 1/2	-	27,5	17	7	13,2	24	1,81
14	1/2 NPT	8,1	21,2	-	1/2 NPT	27,5	16	7	-	23,8	1,81
18	R 3/4	9,5	26,4	Rp 3/4	-	31	18	8	14,5	27	1,81
18	3/4 NPT	8,6	26,6	-	3/4 NPT	33	18	8	-	28,6	1,81
24	R 1	10,4	33,2	Rp 1	-	40,5	21	9	16,8	36	2,30
24	1 NPT	10,2	33,7	-	1 NPT	41,5	22	8	-	34,9	2,21
32	R 1 1/4	12,7	42	Rp 1 1/4	-	53	24	9	19,1	46	2,30
32	1 1/4 NPT	10,7	42,2	-	1 1/4 NPT	51,5	23	9	-	44,5	2,21

Specification

Body
Brass
CuZn40Pb2

Contrast screen
Technoploymer (Polysulfon)

temperature resistant up to 100 °C
Sight glass float-glass
O-rings rubber
NBR (Perbunan)

RoHS compliant

On request

EPDM O-rings

Information

The conical thread of the oil level sight glasses GN 743.7 makes a metallic seal possible. When tightening the conical male thread R it blocks itself with the appropriate cylindrical female thread Rp.

With the datum plane a the R-male thread has the same thread diameter as the Rp-female thread, so that it can be screwed in by hand. The strong tightening by means of a tool increases the length of engagement and seals the screw connection. Additionally a sealant (hemp or teflon band) is usually used. The R-thread is „roughened“, so that the sealant does not shift when screwing in.