ASME B18.16.6 Proof Loads,Clamp Loads,and Prevailing Torques for Fine Thread Locknuts

Proof Loads,Clamp Loads,and Prevailing Torques for Fine Thread Locknuts

Nut Size and
Threads Per
Inch 		Grade N2 and A Nuts Grade N5, B, and F Nuts Grade N8, C, and G Nuts Prevailing Torque
Proof
Load, lb
[Notes
(1), (2)] 		Clamp
Load, lb
[Notes (1), (3)] 		Proof
Load, lb
[Notes
(1), (2)] 		Clamp
Load, lb
[Notes (1), (3)] 		Proof
Load, lb
[Note (1)] 		Clamp
Load, lb
[Notes (1), (3)] 		Max.
First
Install,
in.-lb 		Min.
First
Removal,
in.-lb 		Min.
Third
Removal,
in.-lb
No. 4–48 530 270 720 420 990 600 4.0 1.0 0.2
No. 6–40 800 420 1,100 640 1,500 900 8.0 1.5 0.5
No. 8–36 1,200 610 1,600 930 2,200 1,300 12.0 2.0 0.5
No. 10–32 1,600 840 2,200 1,300 3,000 1,800 17 2.5 1.0
No. 12–28 2,100 1,050 2,800 1,650 3,900 2,350 27 3.5 1.0
¼–28 2,900 1,500 4,000 2,300 5,450 3,250 40 5.0 1.5
5⁄16–24 4,650 2,400 6,350 3,700 8,700 5,200 80 8.0 2.5
⅜–24 7,000 3,600 9,550 5,600 13,200 7,900 110 12.0 4.0
7⁄16–20 9,500 4,900 13,000 7,550 17,800 10,700 135 17.0 5.0
½–20 12,800 6,550 17,400 10,200 24,000 14,400 204 22 7.5
9⁄16–18 16,200 8,350 22,100 13,000 30,400 18,300 300 30 10.0
⅝–18 20,500 10,500 27,900 16,300 38,400 23,000 420 39 12.5
¾–16 29,800 15,400 40,700 23,800 56,000 33,600 540 58 20
7⁄8–14 40,800 12,600 55,500 32,400 76,400 45,800 840 88 30
1–14 54,400 16,800 74,100 43,300 101,900 61,100 1,080 120 40
1–12 53,000 16,400 72,300 42,300 99,500 59,700 1,080 120 40
1⅛–12 68,500 21,200 80,400 47,500 128,000 76,800 1,200 150 50
1¼–12 85,800 26,600 100,900 59,700 161,000 96,600 1,320 188 60
1⅜–12 105,200 32,500 123,600 72,900 197,000 118,000 1,620 220 70
1½–12 126,500 39,100 148,600 87,700 237,000 142,000 1,800 260 90

GENERAL NOTE: For styles NTE, NTU, and NTM, the proof load and clamp load values shall be 45% of those shown in this Table.

NOTES:

(1) For values on sizes not listed in Table 13, agreement shall be reached between purchaser and supplier.

(2) For style NU, the proof load values shall be 110% of the values shown in this Table, excluding grades N8, C, and G.

(3) The supplier shall report the torque range to achieve the clamp load values in this Table.