Prevailing-torque steel hex and hex flange nuts, inch series (IFI 100/107)

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Dimensions in inches (1 inch=25.4 mm) source IFI 100-107 table 2- prevailing-torque regular and light hex nuts

d Thread size

UNC (nr of threads x inch)

UNF (nr of threads x inch)
F basic G min H max Top insert H max All metal type J min

inches mm Regular series Light series Regular series Light series

4 2.84 40 48 0.25 0.25 0.275 0.275 0.163 0.163 0.066

6 3.51 32 40 0.313 0.313 0.344 0.344 0.188 0.171 0.075

8 4.17 32 36 0.344 0.344 0.378 0.378 0.239 0.191 0.083

10 4.83 24 32 0.375 0.375 0.413 0.413 0.249 0.241 0.083

12 5.49 24 28 0.438 0.438 0.482 0.482 0.328 0.241 0.103

1/4
6.35 20 28 0.438 0.438 0.488 0.488 0.328 0.288 0.145

5/16
7.94 18 24 0.5 0.5 0.557 0.557 0.359 0.336 0.166

3/8
9.53 16 24 0.56 0.56 0.628 0.628 0.469 0.415 0.198

7/16
11.11 14 20 0.69 0.69 0.768 0.768 0.524 0.463 0.223

1/2
12.70 13 20 0.75 0.75 0.84 0.84 0.609 0.573 0.262

9/16
14.29 12 18 0.875 0.875 0.98 0.98 0.656 0.621 0.286

5/8
15.88 11 18 0.94 0.94 1.05 1.05 0.765 0.731 0.329

3/4
19.05 10 16 1.125 1.06 1.24 1.19 0.89 0.827 0.382

7/8
22.23 9 14 1.313 1.25 1.447 1.4 1 0.922 0.45

1
25.40 8 12 1.5 1.44 1.653 1.62 1.124 1.018 0.513

1-1/8 28.58 7 12 1.69 1.63 1.86 1.83 1.281 1.176 0.576

1-1/4 31.75 7 12 1.875 1.82 2.066 2.05 1.422 1.272 0.628

1-3/8 34.93 6 12 2.06 2 2.273 2.26 1.609 1.4 0.681

1-1/2 38.10 6 12 2.25 2.188 2.48 2.47 1.671 1.53 0.757

Dimensions in inches (1 inch=25.4 mm) source IFI 100-107 table 3- prevailing-torque hex flange nuts

d Thread size

UNC (nr of threads x inch)

UNF (nr of threads x inch)
F basic
G min
H max K min J min

inches mm

1/4
6.35 20 28 0.438 0.488 0.3 0.04 0.14

5/16
7.94 18 24 0.5 0.557 0.365 0.05 0.17

3/8
9.53 16 24 0.56 0.628 0.425 0.06 0.2

7/16
11.11 14 20 0.69 0.768 0.495 0.07 0.23

1/2
12.70 13 20 0.75 0.84 0.555 0.08 0.26

9/16
14.29 12 18 0.875 0.98 0.625 0.09 0.29

5/8
15.88 11 18 0.94 1.05 0.69 0.1 0.32

3/4
19.05 10 16 1.06 1.19 0.825 0.11 0.38

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ITALY

BUORA D.P.U. s.r.l.

Founded in 1969, Buora D.P.U. is a distributor certified following ISO 9001. The company offers the complete range of high strength fasteners, ready on stock, both coarse and fine pitches with metric and inch threads. Distributor of prestigious brands such as UNBRAKO and NORD-LOCK, for Buora D.P.U. the service always comes first, therefore there is not minimum quantity required.

CERTIFICATIONS: UNI EN ISO 9001:2015

TAIWAN

Lu Chu Shin Yee Works CO., LTD.

Leader manufacturer of hex nuts, cap nuts, wing nuts, flange nuts, nylon insert nuts, weld nuts, square nuts, wheel nuts, etc...

CERTIFICATIONS: ISO 9001-2008 | ISO/TS 16949-2009

GERMANY

PFITZER Verbindungstechnik GmbH