Guide 11 · Fastener Reference Guide

Nuts

Hex nut dimensions across the metric and imperial standards, including nyloc and thin nuts.

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Property Classes 04 and 05 AS 1112.1 / AS 1112.4

Diameter mm	Pitch mm	af (Min)	af (Max)	ac (Min)	k (Min)	k (Max)	l (Min)	l (Max)
M4	0.70	6.78	7.00	7.66	2.90	3.20	1.95	2.20
M5	0.80	7.78	8.00	8.79	4.40	4.70	2.45	2.70
M6	1.00	9.78	10.00	11.05	4.90	5.20	2.90	3.20
M8	1.25	12.73	13.00	14.38	6.44	6.80	3.70	4.00
M10	1.50	15.73	16.00	17.77	8.04	8.40	4.70	5.00
M12	1.75	17.73	18.00	20.03	10.37	10.80	5.70	6.00
M14	2.00	20.67	21.00	23.35	12.10	12.80	6.42	7.00
M16	2.00	23.67	24.00	26.75	14.10	14.80	7.42	8.00
M18	2.50	26.16	27.00	29.56	15.10	15.80	8.42	9.00
M20	2.50	29.16	30.00	32.95	16.90	18.00	9.10	10.00
M22	2.50	33.00	34.00	37.29	18.10	19.40	9.90	11.00
M24	3.00	35.00	36.00	39.55	20.20	21.50	10.90	12.00
M27	3.00	40.00	41.00	45.20	22.50	23.80	12.40	13.50
M30	3.50	45.00	46.00	50.85	24.30	25.60	13.90	15.00
M33	3.50	49.00	50.00	55.37	27.40	28.70	15.40	16.50
M36	4.00	53.80	55.00	60.79	29.40	31.00	16.90	18.00
M42	4.50	63.10	65.00	71.30	32.40	34.00	19.70	21.00
M48	5.00	73.10	75.00	82.60	36.40	38.00	22.70	24.00
M56	5.50	82.80	85.00	93.56	43.40	45.00	26.70	28.00
M64	6.00	92.80	95.00	104.86	49.10	51.00	30.40	32.00

(Thin nut thicknesses included for information only. Standard does not cover thin nuts) AS / NZS 2465

Diameter	af (Min)	af (Max)	ac (Min)	ac (Max)	k (Min)	k (Max)	l (Min)	l (Max)
1/4	0.428	0.438	0.488	0.505	0.212	0.226	0.150	0.163
5/16	0.489	0.500	0.557	0.577	0.258	0.273	0.180	0.195
3/8	0.551	0.562	0.628	0.650	0.320	0.337	0.210	0.227
7/16	0.675	0.688	0.768	0.794	0.365	0.385	0.240	0.260
1/2	0.736	0.750	0.840	0.866	0.427	0.448	0.302	0.323
9/16	0.861	0.875	0.982	1.010	0.473	0.496	0.301	0.324
5/8	0.922	0.938	1.051	1.083	0.535	0.559	0.363	0.387
3/4	1.088	1.125	1.240	1.299	0.617	0.665	0.398	0.446
7/8	1.269	1.312	1.447	1.516	0.724	0.776	0.458	0.510
1	1.450	1.500	1.653	1.732	0.831	0.887	0.519	0.575
1 1/8	1.631	1.688	1.859	1.949	0.939	0.999	0.579	0.639
1 1/4	1.812	1.875	2.066	2.165	1.030	1.094	0.687	0.751
1 3/8	1.994	2.062	2.273	2.382	1.138	1.206	0.747	0.815
1 1/2	2.175	2.250	2.480	2.598	1.245	1.317	0.808	0.880

(Thin nut thicknesses included for information only. Standard does not cover thin nuts) AS / NZS 2451

Diameter	af (Min)	af (Max)	ac (Min)	k (Min)	k (Max)	l (Min)	l (Max)
1/4	0.435	0.445	0.50	0.180	0.200	0.180	0.185
5/16	0.515	0.525	0.59	0.230	0.250	0.200	0.210
3/8	0.585	0.600	0.67	0.292	0.312	0.250	0.260
7/16	0.695	0.710	0.79	0.355	0.375	0.265	0.275
1/2	0.800	0.820	0.91	0.417	0.437	0.290	0.300
5/8	0.985	1.010	1.12	0.542	0.562	0.375	0.410
3/4	1.175	1.200	1.34	0.668	0.687	0.458	0.490
7/8	1.270	1.300	1.45	0.720	0.750	0.500	0.550
1	1.450	1.480	1.65	0.835	0.875	0.583	0.630
1 1/8	1.640	1.670	1.87	0.960	1.000	0.666	0.720
1 1/4	1.815	1.860	2.07	1.108	1.125	0.750	0.810
1 3/8	2.005	2.050	2.29	1.219	1.250	0.833	0.890
1 1/2	2.175	2.220	2.48	1.315	1.375	0.916	0.980
1 5/8	2.365	2.410	2.70	1.500	1.580	1.000	1.060
1 3/4	2.520	2.580	2.87	1.625	1.725	1.083	1.160
2	2.700	2.760	3.08	1.750	1.850	1.166	1.250

Insert Locknuts DIN 985

Diameter mm	Pitch mm	af (Min)	af (Max)	ac (Min)	t (Max)	e (Min)
M3	0.50	5.32	5.50	6.01	4.00	2.40
M4	0.70	6.78	7.00	7.66	5.00	2.90
M5	0.80	7.78	8.00	8.79	5.00	3.20
M6	1.00	9.78	10.00	11.05	6.00	4.00
M8	1.25	12.73	13.00	14.38	8.00	5.50
M10	1.50	16.73	17.00	18.90	10.00	6.50
M12	1.75	18.67	19.00	21.10	12.00	8.00
M14	2.00	21.67	22.00	24.49	14.00	9.50
M16	2.00	23.67	24.00	26.75	16.00	10.50
M18	2.50	26.16	27.00	29.56	18.50	13.00
M20	2.50	29.16	30.00	32.95	20.00	14.00
M22	2.50	31.00	32.00	35.03	22.00	15.00
M24	3.00	35.00	36.00	39.55	24.00	15.00
M30	3.50	45.00	46.00	50.85	30.00	19.00
M36	4.00	53.80	55.00	60.79	36.00	25.00
M42	4.50	63.10	65.00	71.30	42.00	29.00
M48	5.00	73.10	75.00	82.60	48.00	36.00

UNC and UNF Nylon Insert Locknuts ASME B18.16.6 (Style NE)

Diameter	af (Min)	af (Max)	ac (Min)	t (Max)	e (Min)
1/4	0.430	0.439	0.482	0.328	0.225
5/16	0.489	0.502	0.552	0.359	0.250
3/8	0.551	0.564	0.622	0.468	0.335
7/16	0.616	0.627	0.698	0.468	0.324
1/2	0.736	0.752	0.837	0.609	0.464
9/16	0.861	0.877	0.978	0.656	0.469
5/8	0.922	0.940	1.051	0.765	0.593
3/4	1.052	1.064	1.191	0.890	0.742
7/8	1.239	1.252	1.403	0.999	0.790
1	1.427	1.440	1.615	1.078	0.825
1 1/8	1.614	1.627	1.826	1.203	0.930
1 1/4	1.801	1.815	2.038	1.422	1.125
1 3/8	1.973	2.008	2.232	1.609	1.282
1 1/2	2.159	2.197	2.444	1.640	1.313

UNC & UNF All-Metal Type Prevailing Torque Locknuts ASME B18.16.6

Diameter	af (Min)	af (Max)	ac (Min)	ac (Max)	t (Min)	t (Max)	h (Min)
No 4	0.241	0.251	0.275	0.289	0.087	0.163	0.066
No 6	0.302	0.313	0.344	0.361	0.102	0.171	0.075
No 8	0.332	0.345	0.378	0.397	0.117	0.191	0.083
No 10	0.362	0.376	0.413	0.433	0.117	0.241	0.083
No 12	0.423	0.438	0.482	0.505	0.148	0.241	0.103
1/4	0.428	0.439	0.488	0.505	0.212	0.288	0.145
5/16	0.489	0.502	0.557	0.577	0.258	0.366	0.166
3/8	0.551	0.565	0.628	0.650	0.320	0.415	0.198
7/16	0.675	0.690	0.768	0.794	0.365	0.463	0.223
1/2	0.736	0.752	0.840	0.866	0.427	0.573	0.262
9/16	0.861	0.877	0.982	1.010	0.473	0.621	0.286
5/8	0.922	0.940	1.051	1.083	0.535	0.731	0.329
3/4	1.088	1.127	1.240	1.299	0.617	0.827	0.382
7/8	1.269	1.315	1.447	1.516	0.724	0.922	0.450
1	1.450	1.502	1.653	1.732	0.831	1.018	0.513
1 1/8	1.631	1.690	1.859	1.949	0.939	1.176	0.576
1 1/4	1.812	1.877	2.066	2.165	1.030	1.272	0.628
1 3/8	1.994	2.065	2.273	2.382	1.138	1.399	0.681
1 1/2	2.175	2.252	2.480	2.598	1.245	1.526	0.757

Metric Fine Pitch Thread Nylon Insert Locknuts DIN 985

Diameter mm	Pitch mm	af (Min)	af (Max)	ac (Min)	t (Max)	e (Min)
M8	1.00	12.73	13.00	14.38	8.00	5.50
M10	1.25	16.73	17.00	18.90	10.00	6.50
M12	1.25	18.67	19.00	21.10	12.00	8.00
M12	1.50	18.67	19.00	21.10	12.00	8.00
M14	1.50	21.67	22.00	24.49	14.00	9.50
M16	1.50	23.67	24.00	26.75	16.00	10.50
M18	1.50	26.16	27.00	29.56	18.50	13.00
M20	1.50	29.16	30.00	32.95	20.00	14.00
M22	1.50	31.00	32.00	35.03	22.00	15.00
M24	2.00	35.00	36.00	39.55	24.00	15.00

Locknuts DIN 980 (type V)

Diameter mm	Pitch mm	af (Min)	af (Max)	ac (Min)	t (Min)	t (Max)	h (Min)
M5	0.80	7.78	8.00	8.79	4.80	5.10	2.75
M6	1.00	9.78	10.00	11.05	5.70	6.00	3.30
M8	1.25	12.73	13.00	14.38	7.50	8.00	4.40
M10	1.50	16.73	17.00	18.90	9.00	10.00	5.50
M12	1.75	18.67	19.00	21.10	11.00	12.00	6.60
M14	2.00	21.67	22.00	24.49	12.00	14.00	7.70
M16	2.00	23.67	24.00	26.75	14.00	16.00	8.80
M20	2.50	29.16	30.00	32.95	18.00	20.00	11.00
M24	3.00	35.00	36.00	39.55	22.00	24.00	13.20
M30	3.50	45.00	46.00	50.85	28.00	30.00	16.50
M36	4.00	53.80	55.00	60.79	34.00	36.00	19.80

Metric Coarse Hex Slotted Nuts (For information only)

Diameter mm	af (Max)	ac (Max)	t (Min)	t (Max)	h (Min)	h (Max)	s (Max)
M4	7.00	8.10	4.70	5.00	2.90	3.20	1.80
M5	8.00	9.20	6.40	6.70	4.40	4.70	2.00
M6	10.00	11.50	7.34	7.70	4.90	5.20	2.60
M8	13.00	15.00	9.44	9.80	6.44	6.80	3.10
M10	16.00	18.40	11.97	12.40	8.04	8.40	3.40
M12	18.00	20.70	15.37	15.80	10.37	10.80	4.25
M14	21.00	24.20	17.10	17.80	12.10	12.80	4.25
M16	24.00	27.70	20.28	20.80	14.10	14.80	5.70
M18	27.00	31.20	21.00	21.75	15.10	15.80	5.70
M20	30.00	34.60	23.16	24.00	16.90	18.00	5.70
M22	32.00	36.90	28.30	29.05	19.80	21.10	6.70
M24	36.00	41.60	28.66	29.50	20.20	21.50	6.70
M27	41.00	47.30	30.40	31.75	22.50	23.80	6.70
M30	46.00	53.10	33.60	34.65	24.30	25.60	8.50
M36	55.00	63.50	39.00	40.00	29.40	31.00	8.50

UNC & UNF Hex Slotted Nuts ASME B18.2.2

Diameter	af (Max)	ac (Max)	t (Min)	t (Max)	h (Min)	h (Max)	s (Max)
1/4	0.438	0.505	0.212	0.226	0.12	0.14	0.10
5/16	0.500	0.577	0.258	0.273	0.16	0.18	0.12
3/8	0.562	0.650	0.320	0.337	0.19	0.21	0.15
7/16	0.688	0.794	0.365	0.385	0.21	0.23	0.15
1/2	0.750	0.866	0.427	0.448	0.27	0.29	0.18
9/16	0.875	1.010	0.473	0.496	0.29	0.31	0.18
5/8	0.938	1.083	0.535	0.559	0.32	0.34	0.24
3/4	1.125	1.299	0.617	0.665	0.38	0.40	0.24
7/8	1.312	1.516	0.724	0.776	0.49	0.52	0.24
1	1.500	1.732	0.831	0.887	0.56	0.59	0.30
1 1/8	1.688	1.949	0.939	0.999	0.61	0.64	0.33
1 1/4	1.875	2.165	1.030	1.094	0.67	0.70	0.40
1 3/8	2.062	2.382	1.138	1.206	0.78	0.82	0.40
1 1/2	2.250	2.598	1.245	1.317	0.82	0.86	0.46

UNC & UNF Hex Castle Nuts (For information only)

Diameter	af (Max)	ac (Max)	t (Min)	t (Max)	h (Max)	r (Max)	s (Max)
1/4	0.438	0.505	0.274	0.288	0.200	0.371	0.100
5/16	0.500	0.577	0.320	0.336	0.240	0.425	0.120
3/8	0.562	0.650	0.398	0.415	0.290	0.478	0.150
7/16	0.688	0.794	0.444	0.463	0.310	0.582	0.150
1/2	0.750	0.866	0.552	0.573	0.420	0.637	0.180
9/16	0.875	1.010	0.598	0.621	0.430	0.744	0.180
5/8	0.938	1.083	0.706	0.731	0.510	0.797	0.240
3/4	1.125	1.299	0.798	0.827	0.570	0.941	0.240
7/8	1.312	1.516	0.890	0.922	0.670	1.097	0.240
1	1.500	1.732	0.982	1.018	0.730	1.254	0.300
1 1/8	1.688	1.949	1.136	1.176	0.830	1.411	0.330
1 1/4	1.875	2.165	1.228	1.272	0.890	1.570	0.400
1 3/8	2.062	2.382	1.351	1.399	1.020	1.726	0.400
1 1/2	2.250	2.598	1.474	1.526	1.080	1.881	0.460

Metric Coarse Pitch Thread Hex Castle Nuts (For information only)

Diameter mm	af (Max)	ac (Max)	t (Min)	t (Max)	h (Max)	r (Max)	s (Max)
M10	16.00	18.40	11.97	12.40	8.40	14.00	3.40
M12	18.00	20.70	15.37	15.80	10.80	16.00	4.25
M14	21.00	24.20	17.10	17.80	12.80	19.00	4.25
M16	24.00	27.70	20.28	20.80	14.80	22.00	5.00
M18	27.00	31.20	21.00	21.75	15.80	25.00	5.70
M20	30.00	34.60	23.16	24.00	18.00	28.00	5.70
M22	32.00	36.90	28.30	29.05	21.10	30.00	6.70
M24	36.00	41.60	28.66	29.50	21.50	34.00	6.70
M27	41.00	47.30	30.40	31.75	23.80	38.00	6.70
M30	46.00	53.10	33.60	34.60	25.60	42.00	8.50
M33	50.00	57.70	36.30	37.65	28.70	46.00	8.50
M36	55.00	63.50	39.00	40.00	31.00	50.00	8.50
M39	60.00	69.30	40.80	42.40	33.40	55.00	8.50
M42	65.00	75.10	45.80	46.80	34.80	58.00	10.50
M48	75.00	86.60	49.60	50.80	38.80	65.00	10.50
M56	85.00	98.10	56.60	57.80	45.80	75.00	10.50
M64	95.00	109.70	65.75	66.95	52.00	85.00	12.80

Metric Coarse Pitch Thread Machined Hex Deep Nuts (Dimensions to manufacturers standard)

Diameter mm	Pitch mm	af (Max)	ac (Max)	t (Min)	t (Max)
M8	1.25	13.00	15.00	11.73	12.00
M10	1.50	16.00	18.40	14.75	15.00
M12	1.75	18.00	20.70	18.41	18.50
M14	2.00	21.00	24.20	19.83	20.00
M16	2.00	24.00	27.70	23.80	24.00
M18	2.50	27.00	31.20	26.34	26.50
M20	2.50	30.00	34.60	27.68	28.00
M22	2.50	32.00	36.90	32.54	32.70
M24	3.00	36.00	41.60	33.32	33.50
M30	3.50	46.00	53.10	41.10	41.30
M36	4.00	55.00	63.50	47.62	47.80

Metric Flanged Serrated Hex Nuts DIN 6923

Diameter mm	Pitch mm	af (Max)	k (Max)	d (Max)
M5	0.80	8.00	5.00	11.80
M6	1.00	10.00	6.00	14.20
M8	1.25	13.00	8.00	17.90
M10	1.50	15.00	10.00	21.80
M12	1.75	18.00	12.00	26.00

UNC & UNF Flanged Serrated Hex Nuts IFI 145

Diameter	af (Max)	ac (Max)	k (Max)	d (Nom)
No 10	0.375	0.433	0.219	0.500
1/4	0.438	0.505	0.236	0.594
5/16	0.500	0.577	0.283	0.680
3/8	0.562	0.650	0.347	0.750
7/16	0.688	0.794	0.395	0.937
1/2	0.750	0.866	0.458	1.031

UNC & UNF Machined Hex Deep Nuts (Dimensions to manufacturers standard)

Diameter	af (Max)	ac (Max)	t (Nom)
1/4	0.437	0.505	3/8
5/16	0.500	0.577	29/64
3/8	0.562	0.650	1/2
7/16	0.687	0.794	39/64
1/2	0.750	0.866	11/16
9/16	0.875	1.010	3/4
5/8	0.937	1.083	27/32
3/4	1.125	1.299	1
7/8	1.312	1.516	1 1/16
1	1.500	1.732	1 5/16
1 1/8	1.670	1.949	1 1/2
1 1/4	1.860	2.165	1 5/8
1 1/2	2.165	2.598	1 15/16

Metric Coarse Wing Nuts UNI 5448

Diameter	e (Nom)	f (Nom)	h (Nom)
M3	17.6	8.0	8.6
M4	17.6	8.0	8.6
M5	22.5	10.3	11.0
M6	27.8	12.7	13.6
M8	30.3	13.8	14.8
M10	36.2	16.5	17.7
M12	49.4	22.5	24.1
M14	58.3	26.6	28.5
M16	58.3	26.6	28.5
M18	68.5	29.5	33.8
M20	68.5	29.5	33.8

Metric Square Pilotless Weld Nuts DIN 928

Diameter mm	Pitch mm	ac (Min)	af (Nom)	h (Nom)	m (Nom)	Panel Thickness (Min)	Panel Thickness (Max)	Proof Load kN
M4	0.70	9.0	7.00	0.60	3.50	0.75	3.00	6.80
M5	0.80	12.0	9.00	0.80	4.20	0.88	3.50	11.00
M6	1.00	13.0	10.00	0.80	5.00	0.88	4.00	15.50
M8	1.25	18.0	14.00	1.00	6.50	1.00	4.50	28.30
M10	1.50	22.0	17.00	1.20	8.00	1.25	5.00	44.80
M12	1.75	25.0	19.00	1.40	9.50	1.50	5.00	65.30

UNC & UNF Wing Nuts ANSI B18.17, Light Series

Diameter	e (Max)	f (Max)	h (Max)
No 10	0.91	0.43	0.47
1/4	1.10	0.50	0.57
5/16	1.25	0.58	0.66
3/8	1.44	0.70	0.79
1/2	1.94	0.93	1.00

Metric Hex Weld Nuts with Pilot DIN 929

Diameter mm	Pitch mm	af1 (Nom)	h1 (Nom)	m1 (Nom)	s (Nom)	Panel Thickness (Min)	Panel Thickness (Max)	Proof Load kN
M4	0.70	9.00	0.35	3.50	6.00	0.75	3.00	6.80
M5	0.80	10.00	0.40	4.00	7.00	0.88	3.50	11.00
M6	1.00	11.00	0.40	5.00	8.00	0.88	4.00	15.50
M8	1.25	14.00	0.50	6.50	10.50	1.00	4.50	28.30
M10	1.50	17.00	0.65	8.00	12.50	1.25	5.00	44.80
M12	1.75	19.00	0.80	10.00	14.80	1.50	5.00	65.30
M16	2.00	24.00	1.00	13.00	18.80	2.00	6.00	123.00

Metric Dome Nut DIN 1587

Diameter	a (Max)	c (Max)	k (Max)
M3	5.50	2.40	7.0
M4	7.00	3.20	8.0
M5	8.00	4.00	10.0
M6	10.00	5.00	12.0
M8	13.00	6.50	15.0
M10	17.00	8.00	18.0
M12	19.00	10.00	22.0
M16	24.00	13.00	28.0
M20	30.00	16.00	34.0
M24	36.00	19.00	42.0

Thin nut thicknesses are included for information only.

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