4-48 Knobs | McMaster-Carr

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About Thumb Screw and Binding Post Materials

Use these slim thumb screws in tight spaces. Made from 18-8 stainless steel, they're chemical resistant and may be mildly magnetic. The head is knurled for slip-resistant controlled adjustment. Length is measured from under the head.

For technical drawings and 3-D models, click on a part number.

		Head
Lg.	Threading	Dia.	Ht.	Tensile Strength, psi	Hardness		Each
18-8 Stainless Steel
4-48
1/2"	Fully Threaded	1/4"	1/2"	80,000	Rockwell B83	000000000	00000
3/4"	Fully Threaded	1/4"	1/2"	80,000	Rockwell B83	000000000	0000
1"	Fully Threaded	1/4"	1/2"	80,000	Rockwell B83	000000000	0000

Slotted Narrow Knurled-Head Thumb Screws

These thumb screws are slim to fit in tight spaces. Made from 18-8 stainless steel, they're chemical resistant and may be mildly magnetic. The head is knurled for slip-resistant controlled adjustment. Length is measured from under the head.

For technical drawings and 3-D models, click on a part number.

		Head
Lg.	Threading	Dia.	Ht.	Tensile Strength, psi	Hardness		Each
18-8 Stainless Steel
4-48
1/2"	Fully Threaded	1/4"	1/2"	80,000	Rockwell B83	000000000	000000
3/4"	Fully Threaded	1/4"	1/2"	80,000	Rockwell B83	000000000	00000
1"	Fully Threaded	1/4"	1/2"	80,000	Rockwell B83	000000000	00000