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Close Tolerance Bolt

Model / MPN: BACB30LJ4-10 | NSN: 5306-01-200-7747
ITAR Registered seal

An externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The major diameter of the threads shall be at least one thousandth (0.001) of an inch (0.025 mm) below the shank diameter, but not below the major diameter for applicable class of fit, as shown in the screw thread standards, federal standard h28 and/or other nationally recognized standards. The head is not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160, 000 pounds per square inch (1100 megapascals) tensile strength, see bolt, shear. For items fabricated from material having less than 160, 000 pounds per square inch (1100 megapascals) tensile strength and not having a close tolerance, see bolt, machine.

Product Details
NATO Stock Number
5306-01-200-7747
Sold in multiples of
1 EA
DEMIL
NO
Thread Class
3a
Thread Direction
Right-hand
Thread Length
Between 0.364 inches and 0.414 inches
Fastener Length
Between 0.999 inches and 1.029 inches
Head Style
Undercut hexagon
Head Height
Between 0.125 inches and 0.140 inches
Width Between Flats
Between 0.430 inches and 0.439 inches
Grip Diameter
Between 0.2485 inches and 0.2495 inches
Thread Diameter
0.250 inches
Grip Length
Between 0.615 inches and 0.635 inches
Thready Qty Per Inch (tpi)
28
Surface Finish
32.0 microinches bearing surface of head
Surface Finish
32.0 microinches grip
Surface Finish
32.0 microinches threads
Material
Iron alloy 660
Material Specification
Ams 5731 assn standard single material response
Surface Treatment
Chromate and cadmium
Surface Treatment Specification
Qq-p-416 type 2 cl 2 federal specification single treatment response
Thread Series Designator
Unf
Solicitations
Solicitation Description Qty UOM Close Date
SPE5E417T7796 Bolt, Close Toleranc 105 EA 03/17/2017
SPE5E418T0656 Bolt, Close Toleranc 212 EA 10/23/2017
SPE5E419T077G Bolt, Close Toleranc 206 EA 06/27/2019

Pricing and Availability

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