Forged Eye Bolt Sizes (ASME B18.15 Inch Series)

Forged eye bolt dimensions and sizes per ASME B18.15 for inch series bolts. Tables include plain pattern and shoulder pattern forged eye bolts with shank length, eye dimensions, overall length and thread length.

Forged eye bolt dimensions and nomenclature — Typical forged eye bolt geometry showing shank length, eye dimensions, shoulder and thread length.

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Plain Pattern Forged Eye Bolt Dimensions

Plain pattern forged eye bolts are intended for use with a straight tensile load only. Bending or angular loading can significantly reduce capacity and should be avoided. Preferred nominal sizes are usually indicated in bold within the table.

Nominal Size (Fraction)	Nominal Size (Decimal)	A – Major Thread Dia.	B – Shank Length Style A	B – Shank Length Style B	C – Eye I.D.	D – Nominal Eye O.D.	E – Eye Sect. Dia.	F – Overall Length	G – Min Full Thread Style A	G – Min Full Thread Style B	Thread Size (UNC–2A)
1/4	0.25	0.25	1.00	1.00	0.69	1.19	0.19	2.06	0.75	0.75	1/4 - 20
1/4	0.25	0.28	1.06	1.06	0.81	1.19	0.25	2.38	0.75	0.75	1/4 - 20
5/16	0.31	0.31	1.12	1.06	0.81	1.44	0.25	2.44	0.81	0.75	5/16 - 18
5/16	0.31	0.34	1.19	1.13	0.94	1.44	0.31	2.75	0.81	0.75	5/16 - 18
3/8	0.38	0.38	1.25	1.12	0.94	1.69	0.31	2.81	0.88	0.75	3/8 - 16
3/8	0.38	0.41	1.38	1.25	1.06	1.69	0.38	3.19	0.88	0.75	3/8 - 16
7/16	0.44	0.44	1.38	1.13	1.00	1.81	0.34	3.06	1.00	0.75	7/16 - 14
7/16	0.44	0.47	1.50	1.25	1.12	1.81	0.41	3.44	1.00	0.75	7/16 - 14
1/2	0.50	0.50	1.50	1.13	1.12	2.12	0.44	3.50	1.12	0.75	1/2 - 13
1/2	0.50	0.53	1.62	1.25	1.25	2.12	0.50	3.88	1.12	0.75	1/2 - 13
9/16	0.56	0.56	1.62	1.21	1.19	2.25	0.47	3.75	1.25	0.84	9/16 - 12
9/16	0.56	0.59	1.75	1.34	1.31	2.25	0.53	4.12	1.25	0.84	9/16 - 12
5/8	0.62	0.62	1.75	1.31	1.31	2.56	0.56	4.19	1.38	0.94	5/8 - 11
5/8	0.62	0.66	1.88	1.44	1.44	2.56	0.62	4.56	1.38	0.94	5/8 - 11
3/4	0.75	0.75	2.00	1.50	1.44	2.81	0.62	4.69	1.62	1.13	3/4 - 10
3/4	0.75	0.78	2.12	1.62	1.56	2.81	0.69	5.06	1.62	1.13	3/4 - 10
7/8	0.88	0.88	2.25	1.75	1.56	3.19	0.75	5.31	1.81	1.31	7/8 - 9
7/8	0.88	0.91	2.38	1.88	1.69	3.19	0.81	5.69	1.81	1.31	7/8 - 9
1	1.00	1.00	2.50	1.94	1.69	3.56	0.88	6.44	2.06	1.50	1 - 8
1	1.00	1.06	2.62	2.06	1.81	3.56	0.94	6.88	2.06	1.50	1 - 8
1 1/8	1.12	1.12	2.75	2.23	1.94	4.06	1.00	7.31	2.31	1.69	1 1/8 - 7
1 1/8	1.12	1.19	2.88	2.26	2.06	4.06	1.06	7.69	2.31	1.69	1 1/8 - 7
1 1/4	1.25	1.25	3.00	2.38	2.12	4.44	1.12	8.06	2.50	1.88	1 1/4 - 7
1 1/4	1.25	1.34	3.12	2.50	2.25	4.44	1.19	8.44	2.50	1.88	1 1/4 - 7
1 1/2	1.50	1.50	3.50	2.75	2.44	5.19	1.31	9.22	3.00	2.25	1 1/2 - 6
1 1/2	1.50	1.59	3.62	2.87	2.56	5.19	1.38	9.56	3.00	2.25	1 1/2 - 6
1 3/4	1.75	1.75	3.75	3.18	2.75	6.00	1.50	10.47	3.19	2.62	1 3/4 - 5
1 3/4	1.75	1.84	3.88	3.31	3.00	6.00	1.56	10.88	3.19	2.62	1 3/4 - 5
2	2.00	2.00	4.00	3.62	3.06	6.88	1.75	11.62	3.38	3.00	2 - 4 1/2
2	2.00	2.09	4.12	3.79	3.44	6.88	1.88	12.12	3.38	3.00	2 - 4 1/2
2 1/2	2.50	2.50	5.00	4.50	3.81	8.50	2.19	13.19	4.25	3.75	2 1/2 - 4
2 1/2	2.50	2.62	5.25	4.75	4.19	8.50	2.31	14.06	4.25	3.75	2 1/2 - 4

Shoulder Pattern Forged Eye Bolt Dimensions

Shoulder pattern forged eye bolts include a machined shoulder that allows limited angular loading when properly seated against the mating surface. The table below lists shank length, eye dimensions, eye-to-shoulder distance, shoulder diameter and shoulder height.

Nominal Size (Fraction)	Nominal Size (Decimal)	A – Major Thread Dia.	B – Shank Length Style A	B – Shank Length Style B	C – Eye I.D.	D – Eye O.D.	E – Eye Sect. Dia.	F – Overall Length	G – Min Full Thread Style A	G – Min Full Thread Style B	Thread Size (UNC–2A)	H – Eye to Shoulder	J – Shoulder Dia.	K – Shoulder Height	R – Radius under Shoulder
1/4	0.25	0.25	1.00	1.00	0.69	1.19	0.19	2.22	0.75	0.75	1/4 - 20	0.69	0.50	0.12	0.015
1/4	0.25	0.28	1.06	1.06	0.81	1.19	0.25	2.53	0.75	0.75	1/4 - 20	0.81	0.56	0.19	0.025
5/16	0.31	0.31	1.12	1.06	0.81	1.44	0.25	2.66	0.81	0.75	5/16 - 18	0.88	0.56	0.12	0.015
5/16	0.31	0.34	1.19	1.13	0.94	1.44	0.31	2.97	0.81	0.75	5/16 - 18	1.00	0.62	0.19	0.025
3/8	0.38	0.38	1.25	1.12	0.94	1.69	0.31	3.09	0.88	0.75	3/8 - 16	1.06	0.62	0.12	0.015
3/8	0.38	0.41	1.38	1.25	1.06	1.69	0.38	3.47	0.88	0.75	3/8 - 16	1.19	0.69	0.19	0.025
7/16	0.44	0.44	1.38	1.13	1.00	1.81	0.34	3.22	1.00	0.75	7/16 - 14	1.19	0.75	0.19	0.015
7/16	0.44	0.47	1.50	1.25	1.12	1.81	0.41	3.59	1.00	0.75	7/16 - 14	1.31	0.81	0.25	0.025
1/2	0.50	0.50	1.50	1.13	1.12	2.12	0.44	3.66	1.12	0.75	1/2 - 13	1.31	0.88	0.19	0.015
1/2	0.50	0.53	1.62	1.25	1.25	2.12	0.50	4.03	1.12	0.75	1/2 - 13	1.44	0.94	0.25	0.025
9/16	0.56	0.56	1.62	1.21	1.19	2.25	0.47	3.91	1.25	0.84	9/16 - 12	1.50	0.94	0.22	0.020
9/16	0.56	0.59	1.75	1.34	1.31	2.25	0.53	4.28	1.25	0.84	9/16 - 12	1.62	1.00	0.28	0.045
5/8	0.62	0.62	1.75	1.31	1.31	2.56	0.56	4.44	1.38	0.94	5/8 - 11	1.59	1.00	0.25	0.025
5/8	0.62	0.66	1.88	1.44	1.44	2.56	0.62	4.78	1.38	0.94	5/8 - 11	1.72	1.06	0.31	0.045
3/4	0.75	0.75	2.00	1.50	1.44	2.81	0.62	4.97	1.62	1.12	3/4 - 10	1.72	1.12	0.25	0.020
3/4	0.75	0.78	2.12	1.62	1.56	2.81	0.69	5.34	1.62	1.12	3/4 - 10	1.91	1.25	0.31	0.045
7/8	0.88	0.88	2.25	1.75	1.56	3.19	0.75	5.56	1.81	1.31	7/8 - 9	2.03	1.31	0.31	0.040
7/8	0.88	0.91	2.38	1.88	1.69	3.19	0.81	5.97	1.81	1.31	7/8 - 9	2.22	1.44	0.38	0.065
1	1.00	1.00	2.50	1.94	1.69	3.56	0.88	6.44	2.06	1.50	1 - 8	2.22	1.50	0.38	0.060
1	1.00	1.06	2.62	2.06	1.81	3.56	0.94	6.88	2.06	1.50	1 - 8	2.41	1.62	0.44	0.095
1 1/8	1.12	1.12	2.75	2.23	1.94	4.06	1.00	7.31	2.31	1.69	1 1/8 - 7	2.59	1.69	0.44	0.060
1 1/8	1.12	1.19	2.88	2.26	2.06	4.06	1.06	7.69	2.31	1.69	1 1/8 - 7	2.78	1.81	0.50	0.095
1 1/4	1.25	1.25	3.00	2.38	2.12	4.44	1.12	8.06	2.50	1.88	1 1/4 - 7	2.84	1.88	0.50	0.060
1 1/4	1.25	1.34	3.12	2.50	2.25	4.44	1.19	8.44	2.50	1.88	1 1/4 - 7	3.03	2.00	0.56	0.095
1 1/2	1.50	1.50	3.50	2.75	2.44	5.19	1.31	9.22	3.00	2.25	1 1/2 - 6	3.19	2.12	0.50	0.060
1 1/2	1.50	1.59	3.62	2.87	2.56	5.19	1.38	9.56	3.00	2.25	1 1/2 - 6	3.44	2.25	0.62	0.095
1 3/4	1.75	1.75	3.75	3.18	2.75	6.00	1.50	10.47	3.19	2.62	1 3/4 - 5	3.88	2.50	0.50	0.060
1 3/4	1.75	1.84	3.88	3.31	3.00	6.00	1.56	10.88	3.19	2.62	1 3/4 - 5	4.12	2.62	0.62	0.095
2	2.00	2.00	4.00	3.62	3.06	6.88	1.75	11.62	3.38	3.00	2 - 4 1/2	4.25	2.88	0.62	0.060
2	2.00	2.09	4.12	3.79	3.44	6.88	1.88	12.12	3.38	3.00	2 - 4 1/2	4.50	3.00	0.75	0.095

All dimensions are given in inches. Use forged eye bolts only within the limits of the applicable standard and manufacturer recommendations.

Supplements

References

ASME B18.15, Forged Eyebolts (Inch Series)
Oberg, E., Jones, F. D., Horton, H. L., Ryffel, H. H., Machinery’s Handbook, 30th Edition, Industrial Press.