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Sherex's Closed End Sealed Optisert is the best option for a closed end, round body rivet nut. 

The patent-pending closed-end design provides a sealed option that does not compromise the biting effect of the wedges, delivering superior performance to other round-body, closed-end rivet nuts in the market. The seal helps keep out dust and viscous material from entering inside the base material. 

Optisert is available in a variety of different finishings, seals, or no seal. Pleasemore

Optisert -- Closed End | Steel
Unit of Measure
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Item #

Thread Size

Grip Range
(Min.-Max.)

LB ±.38
(mm)

HD (±.50 - ±.64)
(mm)

HT
± .10

D (Max.)

ILB (Max.)
(mm)

ITD (Ref.)
(mm)

3D CAD

Hole Size
+.15/-.000 (mm)

OPT2-610-8.5BS(mt8.50) N/A M6x1.0 N/A 6.0 - 8.5 N/A 35.43 N/A 17.33 N/A 1.50 N/A 9.98 N/A 25.25 N/A 24.00 N/A N/A 10.00
OPT2-8125-8.5BS(mt8.50) N/A M8x1.25 N/A 6.0 - 8.5 N/A 40.61 N/A 21.77 N/A 2.08 N/A 13.48 N/A 30.00 N/A 32.00 N/A N/A 13.50
Unit of Measure
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