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Sales Systems Limited Products and Services > Fasteners Reference Guide > Nuts > Structural Bolting [Nuts] > Hex Thick Nuts > Item # HTN02500XXX  
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Item # HTN02500XXX, Hex Thick Nut, 1/4" Nominal Dia.


  • Tops and Bearing Surface of Nuts. Nuts in sizes 5/8 in. nominal size and smaller shall be double chamfered. Larger size nuts shall be double chamfered or have washer faced bearing surface and chamfered top.
    The diameter of chamfer circle on double chamfered nuts and diameter of washer face shall be within the limits of the maximum width across flats and 95 percent of the minimum width across flats.
    The tops of washer faced nuts shall be flat and the diameter of 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.
    Bearing surface shall be flat and perpendicular to the axis of the threaded hole within the FIM limits specified for the respective strength level.
  • 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 minimum 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 faces.
  • 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, regardless of feature size.




Manufacturer  · Specifications  · Codes and Standards  · Runout of Bearing Face, FIM

Manufacturer

Manufacturer
Industrial Fasteners Institute


Specifications

Product
Nuts

Unit of Measure
English

Nominal Size or Basic Major Dia. of Thread
1/4 in

Nominal Size or Basic Major Dia. of Thread (Decimal)
0.2500 in

Basic Width Across Flats (F)
7/16 in

Max. Width Across Flats (F)
0.438 in

Min. Width Across Flats (F)
0.428 in

Max. Width Across Corners (G)
0.505 in

Min. Width Across Corners (G)
0.488 in

Basic Thickness (H)
9/32 in

Max. Thickness (H)
0.288 in

Min. Thickness (H)
0.274 in


Codes and Standards

Codes and Standards
ASME/ANSI B18.2.2 1987 (R 1999)


Runout of Bearing Face, FIM

Max. Runout of Bearing Face, FIM (Specified Proof Load Up to 150,000 psi)
0.015 in

Max. Runout of Bearing Face, FIM (Specified Proof Load 150,000 psi and Greater)
0.010 in


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Formulas for Nut Dimensions
(PDF, 296KB)

Wrench Openings for Square and Hex Nuts
(PDF, 244KB)


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