Male-Threaded Tie-Rod Tubular Sight Glass

An inline sanitary tubular sight glass featuring sanitary round male-threaded ends, a replaceable tempered glass viewing tube, and exterior stainless steel tie rods. Offered in SS304 and SS316L with DIN (No.50035) and SMS (No.50036) dimensional tables.

Body Material	SS304 / SS316L (304 / 316L)
End Connection	Sanitary Male Threaded Ends (Rd Thread)
Body Construction	Tie-Rod Tubular Housing with Replaceable Tempered Glass & Stainless Steel Bolts
Nominal Size Range	1/2"–4" (DN20–DN150)
Thread Standards	DIN, SMS

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Sanitary Male-Threaded Ends and Tie-Rod Glass Cage

This inline tubular sight glass features sanitary round (Rd) male-threaded ends on both flanges, clamping a replaceable tempered glass cylinder between full stainless steel tie rods. The open tie-rod structure provides full 360-degree visibility of liquid flow while allowing threaded disassembly with mating union nuts and liners.

DIN No.50035 and SMS No.50036 Dimensional Coverage

The specification table lists 1/2"–4", while the paired technical drawings detail two round-thread standards: No.50035 Straight Thread Sight Glass (DIN) covering DN20–DN150 (threads RD43.5×1/6 to RD189.2×1/4, height H 156–240 mm, outer diameter D 78–215 mm) and No.50036 Straight Thread Sight Glass (SMS) covering 1"–4" (threads RD39.5×1/6 to RD131.2×1/6, height H 156–194 mm).

Material Grades and Gasket Options

CNC-lathed from SS304 or SS316L stainless steel, the sight glass is offered with VMQ (silicone), EPDM, Viton, or PTFE gaskets (source-claimed tempered glass rating up to 10 bar) for food, dairy, beverage, meat processing, vacuum, pharmaceutical, and chemical pipelines.

Thread Standard Checks and Traceability

Verify whether DIN or SMS round thread pitches are required to match your existing union nuts and liners, and tighten tie bolts evenly in a cross pattern during gasket service. Specify any required heat numbers or MTR material certificates when placing orders.