Male-Thread × Union-Nut Tie-Rod Tubular Sight Glass

An inline sanitary tie-rod tubular sight glass photographed with one male-threaded end and one slotted union-nut end (titled Union Ends in the series documentation), housing a replaceable tempered glass cylinder. Offered in SS304 and SS316L across 1/2"–4".

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

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Male-Thread × Union-Nut End Configuration and Tie-Rod Cage

While the series specification header labels the connection as Union Ends, the adopted product photographs show an inline tie-rod sight glass fitted with a sanitary round male thread on one end and a complete slotted union nut assembly on the opposite end. Four exterior stainless steel tie bolts clamp the replaceable tempered glass cylinder for 360-degree visual inspection.

Size Range and Embedded DIN/SMS Reference Drawings

The specification table lists nominal sizes 1/2", 3/4", 1", 1.5", 2", 2.5", 3", and 4". The series specification embeds reference drawings No.50035 Straight Thread Sight Glass (DIN, DN20–DN150, RD43.5×1/6 to RD189.2×1/4) and No.50036 Straight Thread Sight Glass (SMS, 1"–4", RD39.5×1/6 to RD131.2×1/6).

Material Grades and Elastomer Seals

Machined from SS304 or SS316L stainless steel on CNC lathes, the assembly supports 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 lines.

Ordering Checks and Traceability

Confirm whether a male-thread × union-nut combination or symmetric union ends are required for your process pipeline, along with the applicable DIN or SMS round thread standard and any required heat numbers or MTR material certificates when placing your order.