Unified Nuts

Dimensional data charts for Unified Nyloc, Full, Half and Castle Nuts.

Nyloc Nuts are also known as Prevailing Torque Nuts and Half Nuts are also known as Jam Nuts.

Dimensions shown are in Inches, if you wish to convert to mm, please use our universal converter.

NYLOC NUT DIMENSIONS - UNIFIED - BS1768

Nominal Size	Threads Per Inch (TPI)		Across Flats (A/F)	Total Thickness
	UNC	UNF
1/4"	20	28	0.438	0.328
5/16"	18	24	0.500	0.359
3/8"	16	24	0.562	0.469
7/16"	14	20	0.688	0.469
1/2"	13	20	0.750	0.609
5/8"	11	18	0.938	0.766
3/4"	10	16	1.125	0.891

---

FULL NUT DIMENSIONS - UNIFIED - BS1768

Nominal Size	Threads Per Inch (TPI)		Across Flats (A/F)	Thickness
	UNC	UNF
1/4"	20	28	0.438	0.219
5/16"	18	24	0.500	0.266
3/8"	16	24	0.562	0.328
7/16"	14	20	0.688	0.375
1/2"	13	20	0.750	0.438
5/8"	11	18	0.938	0.547
3/4"	10	16	1.125	0.641

---

HALF NUT DIMENSIONS - UNIFIED - BS1768

Nominal Size	Threads Per Inch (TPI)		Across Flats (A/F)	Thickness
	UNC	UNF
1/4"	20	28	0.438	0.156
5/16"	18	24	0.500	0.188
3/8"	16	24	0.562	0.219
7/16"	14	20	0.688	0.250
1/2"	13	20	0.750	0.312
5/8"	11	18	0.938	0.375
3/4"	10	16	1.125	0.422

---

CASTLE NUT DIMENSIONS - UNIFIED - BS1768

Nominal Size	Threads Per Inch (TPI)		Across Flats (A/F)	Total Thickness	Slot Width
	UNC	UNF
1/4"	20	28	0.438	0.281	0.094
5/16"	18	24	0.500	0.344	0.094
3/8"	16	24	0.562	0.438	0.125
7/16"	14	20	0.688	0.500	0.125
1/2"	13	20	0.750	0.562	0.156
5/8"	11	18	0.938	0.750	0.188
3/4"	10	16	1.125	0.875	0.188