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ASME B18.16.6

asme-b18-16-6-nylong-insert-lock-nuts

Dimensions of Nylon Insert Lock Nuts

Nominal Size, AWidth Across Flats, BMinimum Width Across Corners, CHeight, DMinimum Hex Height, EMinimum Bearing Surface Diameter, FMaximum Total Runout of Bearing Surface, FIM
MaxMinMaxMin
1/40.4390.4300.4880.3280.2980.2250.4160.010
5/160.5020.4890.5570.3590.3290.2500.4750.011
3/80.5640.5510.6280.4680.4380.3350.5340.012
7/160.6270.6160.6980.4680.4380.3240.5970.013
1/20.7520.7360.8400.6090.5790.4640.7120.014
9/160.8770.8610.9820.6560.6260.4690.8300.015
5/80.9400.9221.0510.7650.7350.5930.8900.016
3/41.0641.0521.1910.8900.8600.7421.0330.018
7/81.2521.2391.4030.9990.9690.7901.2300.020
11.4401.4271.6191.0781.0160.8251.4180.022
1 1/81.6271.6141.8331.2031.1410.9301.6050.025
1 1/41.8151.8012.0461.4221.3601.1251.7930.028
1 3/82.0081.9732.2591.6091.5471.2821.9620.031
1 1/22.1972.1592.4731.6401.5781.3132.1480.034

Proof Loads, Clamp Loads and Prevailing-Torques for Coarse Thread Series Grades NE2, NE5, and NE8 Nuts

Nut Size and Thread per inch.Grade NE2Grade NE5Grade NE8Prevailing-Torque
Proof Load, lbClamp Load, lbProof Load, lbClamp Load, lbProof Load, lbClamp Load, lbMaximum First Install, in. lbMinimum First Removal, in. lbMinimum Fifth Removal, in. lb
1/4 – 20290013003800200047502850405.01.5
5/18 – 18470021506300335078504700808.02.5
3/8 – 16700032009300495011,600695011012.04.0
7/16 – 149550440012,800680015,900960013517.05.0
1/2 – 1312,800585017,000905021,30012,80020422.07.5
9/16 – 1216,400755021,80011,60027,30016,40030030.010.0
5/8 – 1120,300930027,20014,50033,90020,30042039.012.5
3/4 – 1030,0001380040,10021,30050,10030,10054058.020.0
7/8 – 941,6001240055,40029,50069,30041,60084088.030.0
1 – 854,5001500072,70038,70090,90054,6001080120.040.0
1 1/8 – 768,7001890080,10042,100115,00069,0001200150.050.0
1 1/4 – 787,20024000101,70053,500145,00087,0001320188.060.0
1 3/8 – 6104,00028700121,30063,800173,000104,0001620220.070.0
1 1/2 – 6126,00034800147,50077,600211,000127,0001800260.090.0

Proof Loads, Clamp Loads and Prevailing-Torques for Fine Thread Series Grades NE2, NE5, and NE8 Nuts

Nut Size and Thread per inch. Grade NE2 Grade NE5 Grade NE8 Prevailing-Torque
Proof Load, lb Clamp Load, lb Proof Load, lb Clamp Load, lb Proof Load, lb Clamp Load, lb Maximum First Install, in. lb Minimum First Removal, in. lb Minimum Fifth Removal, in. lb
1/4 – 28 3300 1500 4350 2300 5450 3250 40 5.0 1.5
5/16 – 24 5200 2400 4950 3700 8700 5200 60 8.0 2.5
3/8 – 24 7900 3600 10500 5600 13200 7900 110 12.0 4.0
7/16 – 20 10,700 4900 14200 7550 17800 10700 135 17.0 5.0
1/2 – 20 14,400 6550 19200 10200 24000 14400 204 22.0 7.5
9/16 – 18 18,300 8350 24400 13000 30400 18300 300 30.0 10.0
5/8 – 18 22,900 10500 30700 16300 38400 23000 420 39.0 12.5
3/4 – 16 33,600 15400 44800 23800 56000 33600 540 58.0 20.0
7/8 – 14 45,800 12600 61100 32400 76400 45800 840 88.0 30.0
1 – 14 61,100 16800 81500 43300 101900 61100 1080 120.0 40.0
1 – 12 59,700 16400 79600 42300 99500 59700 1080 120.0 40.0
1 1/8 – 12 76,900 21200 89900 47500 128000 76800 1200 150.0 50.0
1 1/4 – 12 96,600 26600 113000 59700 161000 96600 1320 188.0 60.0
1 3/8 – 12 118,000 32500 138000 72900 197000 118000 1620 220.0 70.0
1 1/2 – 12 142,000 39100 166000 87700 237000 142000 1800 260.0 90.0

Chemical Composition Requirements

Nut GradeC, MaxMn, Min.P, Max.S, Max.
NE20.47…0.120.15
NE50.550.300.050.15
NE80.550.300.040.05

Hardness Requirements

Nut GradeLocknut SizeRockwell Hardness
NE2, NE51/4 – 1 1/2C28, max.
NE81/4 – 5/8C24 – C32
–3/4 – 1C26 – C34
–1 1/8 – 1 1/2C26 – C36