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Heavy Hex Flat Nuts
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Unification.
Bold type indicates products unified dimensionally with British and Canadian standards.
Smaller Sizes.
For sizes 1/4 in. through 1 in., the nuts specified in Table are recommended.
Tops of Nuts.
Tops of nuts shall be flat and chamfered. Diameter of the chamfer circle shall be equal to the maximum width across flats within a tolerance of minus 15 percent. The length of chamfer at hex corners shall be from 5 to 15 percent of the basic thread diameter. The surface of chamfer may be slightly convex or rounded.
Width Across Flats.
Maximum width across flats shall not be exceeded. No transverse section through the nut between 25 and 75 percent of the actual nut thickness as measured from the bearing surface shall be less than the minimum width across flats. For milled-from-bar nuts, see statement in General Data pertaining to the nominal bar size to be used.
Corner Fill.
A rounding or lack of fill at junction of hex corners with chamfer shall be permissible provided the width across corners is within specified limits at and beyond a distance equal to 17.5 percent of the basic thread diameter from the chamfered face.
Bearing Surface.
Bearing surface shall be flat and perpendicular to the axis of the threaded hole within a tolerance of 2 deg.
True Position of Tapped Hole.
The axis of tapped hole shall be located at true position with respect to the axis of nut body within a tolerance zone having a diameter equivalent to 4 percent of the maximum width across flats for 1-1/2 in. nominal size nuts or smaller, and 6 percent of the maximum width across flats for nuts larger than 1-1/2 in., regardless of feature size.
Threads.
Threads shall be Unified coarse thread series (UNC series), Class 2B, in accordance with ASME B1 .1.
Material.
Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with Grade A of ASTM A563. Nuts of other materials such as corrosion resistant (stainless) steel, brass, bronze and aluminum alloys shall have properties as agreed upon between the manufacturer and purchaser. The properties for nuts of several grades of corrosion resistant steel alloys are covered in ASTM F594, and of several nonferrous materials in ASTM F467.
Nominal Size.
Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.
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Results 1 - 14 of 14
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Item #
Description
Nominal Size or Basic Major Dia. of Thread
Basic (F)
Max. (G)
Basic (H)
HHFN11250XXX
Heavy Hex Flat Nut, 1-1/8" Nominal Dia.
1-1/8
in
1-13/16
in
2.093
in
1-1/8
in
HHFN12500XXX
Heavy Hex Flat Nut, 1-1/4" Nominal Dia.
1-1/4
in
2
in
2.309
in
1-1/4
in
HHFN13750XXX
Heavy Hex Flat Nut, 1-3/8" Nominal Dia.
1-3/8
in
2-3/16
in
2.526
in
1-3/8
in
HHFN15000XXX
Heavy Hex Flat Nut, 1-1/2" Nominal Dia.
1-1/2
in
2-3/8
in
2.742
in
1-1/2
in
HHFN17500XXX
Heavy Hex Flat Nut, 1-3/4" Nominal Dia.
1-3/4
in
2-3/4
in
3.175
in
1-3/4
in
HHFN20000XXX
Heavy Hex Flat Nut, 2" Nominal Dia.
2
in
3-1/8
in
3.608
in
2
in
HHFN22500XXX
Heavy Hex Flat Nut, 2-1/4" Nominal Dia.
2-1/4
in
3-1/2
in
4.041
in
2-1/4
in
HHFN25000XXX
Heavy Hex Flat Nut, 2-1/2" Nominal Dia.
2-1/2
in
3-7/8
in
4.474
in
2-1/2
in
HHFN27500XXX
Heavy Hex Flat Nut, 2-3/4" Nominal Dia.
2-3/4
in
4-1/4
in
4.907
in
2-3/4
in
HHFN30000XXX
Heavy Hex Flat Nut, 3" Nominal Dia.
3
in
4-5/8
in
5.340
in
3
in
HHFN32500XXX
Heavy Hex Flat Nut, 3-1/4" Nominal Dia.
3-1/4
in
5
in
5.774
in
3-1/4
in
HHFN35000XXX
Heavy Hex Flat Nut, 3-1/2" Nominal Dia.
3-1/2
in
5-3/8
in
6.207
in
3-1/2
in
HHFN37500XXX
Heavy Hex Flat Nut, 3-3/4" Nominal Dia.
3-3/4
in
5-3/4
in
6.640
in
3-3/4
in
HHFN40000XXX
Heavy Hex Flat Nut, 4" Nominal Dia.
4
in
6-1/8
in
7.073
in
4
in
Results 1 - 14 of 14
1
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