Item # HN13750XXX, Hex Nut, 1-3/8" Nominal Dia. On Sales Systems Ltd.

Unification. Bold type indicates products unified dimensionally with British and Canadian standards. Unification of fine thread nuts is limited to sizes 1 in. and smaller.
Tops and Bearing Surfaces 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

Unification. Bold type indicates products unified dimensionally with British and Canadian standards. Unification of fine thread nuts is limited to sizes 1 in. and smaller.
Tops and Bearing Surfaces 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 surfaces shall be flat and perpendicular to the axis of the threaded hole within the FIM limits specified for the respective nut type and 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 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.
Countersink. Tapped hole shall be countersunk on the bearing face or faces. The maximum countersink diameter shall be the thread basic (nominal) major diameter plus 0.030 in. for 3/8 in. nominal size nuts and smaller, and 1.08 times the basic major diameter for nuts larger than 3/8 in. No part of the threaded portion shall project beyond the bearing surface.
Threads. Threads shall be Unified coarse, fine, or 8 thread series (UNC, UNF, or 8 UN 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 or Grade 2 of SAE J995. 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.

Unit of Measure

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

Manufacturer

Industrial Fasteners Institute

Specifications

Product	N/A Nuts
Unit of Measure	N/A English
Nominal Size or Basic Major Dia. of Thread	N/A 1-3/8 in
Nominal Size or Basic Major Dia. of Thread (Decimal)	N/A 1.3750 in
Basic Width Across Flats (F)	N/A 2-1/16 in
Max. Width Across Flats (F)	N/A 2.062 in
Min. Width Across Flats (F)	N/A 1.994 in
Max. Width Across Corners (G)	N/A 2.382 in
Min. Width Across Corners (G)	N/A 2.273 in
Basic Thickness (H)	N/A 1-11/64 in
Max. Thickness (H)	N/A 1.206 in
Min. Thickness (H)	N/A 1.138 in

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)	N/A 0.036 in
Max. Runout of Bearing Face, FIM (Specified Proof Load 150,000 psi and Greater)	N/A 0.031 in

Manufacturer

Manufacturer

Specifications

Product

Unit of Measure

Nominal Size or Basic Major Dia. of Thread

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

Basic Width Across Flats (F)

Max. Width Across Flats (F)

Min. Width Across Flats (F)

Max. Width Across Corners (G)

Min. Width Across Corners (G)

Basic Thickness (H)

Max. Thickness (H)

Min. Thickness (H)

Codes and Standards

Codes and Standards

Runout of Bearing Face, FIM

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

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