I need to replace a missing screw holding a vintage glass shade 1/2in Long x 1/4-20 UNC Threaded 7/8in Diameter Knurled Head Brass Thumb Screw

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I need to replace a missing screw holding a vintage glass shade 1/2in Long x 1/4-20 UNC Threaded 7/8in Diameter Knurled Head Brass Thumb Screw

It measures 1/8” thick threaded, 1/2” long.
Would this screw fit?

Status: Open Sep 17, 2026 - 06:14 AM

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Staff Answer

Sep 17, 2026 - 06:14 AM

No, this screw would not fit if the threaded portion of your original screw is approximately 1/8 in. in diameter. This screw has a 1/4-20 UNC thread, which is approximately 1/4 in. in diameter. Based on your measurement, your original screw may be a 6-32 UNC screw.

For a better understanding of lamp thread please refer to this helpdesk article.

We carry a variety of 1/2 in. long 6-32 screws HERE. Please note that the listed 1/2 in. screw length refers to the threaded length of the screw.

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I need to replace a missing screw holding a vintage glass shade

1/2in Long x 1/4-20 UNC Threaded 7/8in Diameter Knurled Head Brass Thumb Screw

1/2in Long Thread Length x 1/4-20 UNC Threaded Knurled Head Brass Thumb ScrewHead Measures 7/8 Inch Diameter X 1/4in Height.

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I need to replace a missing screw holding a vintage glass shade 1/2in Long x 1/4-20 UNC Threaded 7/8in Diameter Knurled Head Brass Thumb Screw

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