WC744-8D21
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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 nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std 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) minimum tensile strength, see bolt, shear. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see bolt, machine.
3a thread class, right-hand thread direction, 0.433 inches minimum and 0.473 inches maximum thread length, spline drive shear head head style, 1.755 inches minimum and 1.775 inches maximum fastener length
Product Characteristics
Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.
- Thread Class
- 3a
- Thread Direction
- right-hand
- Thread Length
- 0.433 inches minimum and 0.473 inches maximum
- Fastener Length
- 1.755 inches minimum and 1.775 inches maximum
- Head Style
- spline drive shear head
- Head Height
- 0.281 inches nominal
- Width Between Flats
- 0.774 inches minimum and 0.782 inches maximum
- Grip Diameter
- 0.4990 inches minimum and 0.4995 inches maximum
- Nominal Thread Diameter
- 0.500 inches
- Grip Length
- 1.302 inches minimum and 1.322 inches maximum
- Thread Quantity Per Inch
- 20
- Distance From Head Largest Bearing Surface To Shank Hole Center
- 1.630 inches minimum and 1.660 inches maximum all holes
- Material
- steel comp xm-13 overall
- Material Document And Classification
- ams 5629 assn std single material response overall
- Surface Treatment
- passivate overall
- Surface Treatment Document And Classification
- qq-p-35 fed spec 1st treatment response overall
- Thread Series Designator
- unjf
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| SLB748-8D21 | Close Tolerance Bolt |
| ST3M744-8D21 | Close Tolerance Bolt |
| VCG0001-8D21 | Close Tolerance Bolt |
| VS3174-8D21 | Close Tolerance Bolt |
| WC744-8D21 | Close Tolerance Bolt |
FAQs
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Does NSN 5306-01-133-1570 require demilitarization?
Does NSN 5306-01-133-1570 contain precious materials?
Does NSN 5306-01-133-1570 contain hazardous materials?
When the NSN 5306-01-133-1570 was assigned to the Federal Catalog?
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