1/2 inch (13 mm) Acme Lead Screw Assemblies

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1/2" (13 mm) KERK^® LEAD SCREW ASSEMBLIES

Lead Screw Size List

Nominal Screw Diameter: 1/2" (13 mm)

Compatible Lead Screw Nut Styles: ZBX, ZBA, WDG, NTB, BFW, VHD

Diameter		Diameter Code	Lead		Lead Code	Left Hand Avail.	Outside Diameter (For Reference)		Root Diameter (For Reference)		Efficiency %*
inches	mm	Diameter Code	in	mm	Lead Code	Left Hand Avail.	in	mm	in	mm	Efficiency %*
1/2	13	050	0.050	1.27	0050		0.495	12.57	0.433	11.00	29
			0.079	2.00	0079		0.473	12.01	0.355	9.02	41
			0.098	2.50	0098		0.500	12.70	0.383	9.73	46
			0.100	2.54	0100	√	0.490	12.45	0.364	9.25	46
			0.125	3.18	0125		0.500	12.70	0.374	9.50	51
			0.157	4.00	0157		0.500	12.70	0.384	9.75	58
			0.160	4.06	0160		0.500	12.70	0.388	9.86	67
			0.1667	4.23	0167		0.500	12.70	0.384	9.75	58
			0.197	5.00	0197		0.500	12.70	0.365	9.27	62
			0.200	5.08	0200	√	0.492	12.50	0.366	9.30	63
			0.250	6.35	0250		0.500	12.70	0.382	9.70	67
			0.333	8.46	0333	√	0.497	12.62	0.362	9.19	73
			0.394	10.00	0394		0.497	12.62	0.362	9.19	76
			0.400	10.16	0400		0.497	12.62	0.364	9.25	76
			0.500	12.70	0500		0.488	12.40	0.352	8.94	79
			0.630	16.00	0630		0.500	12.70	0.374	9.50	80
			0.750	19.05	0750		0.525	13.34	0.399	10.13	83
			0.800	20.32	0800		0.500	12.70	0.370	9.40	83
			0.984	25.00	0984		0.500	12.70	0.369	9.37	84
			1.000	25.40	1000	√	0.490	12.45	0.372	9.45	84
			1.500	38.10	1500		0.490	12.45	0.374	9.50	85
			2.000	50.80	2000		0.488	12.40	0.378	9.60	87

*Listed efficiencies are theoretical values based on Kerkote^® TFE coated lead screws.

Shaded areas have been translated from their designed inch or mm dimension to an equivalent mm or inch dimension.