639AS3803
View detailed technical data, stock status, and sourcing information for: 639AS3803
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A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. Items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (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 designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.
0.155 inches minimum and 0.175 inches maximum thread length, right-hand thread direction, 0.290 inches minimum and 0.310 inches maximum fastener length, 2a thread class, flat chamfer head style
Product Characteristics
Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.
- Thread Class
- 2a
- Thread Direction
- right-hand
- Thread Length
- 0.155 inches minimum and 0.175 inches maximum
- Fastener Length
- 0.290 inches minimum and 0.310 inches maximum
- Head Style
- flat chamfer
- Head Diameter
- 0.470 inches minimum and 0.490 inches maximum
- Head Height
- 0.075 inches nominal
- Shoulder Diameter
- 0.197 inches minimum and 0.211 inches maximum first shoulder
- Shoulder Length
- 0.080 inches nominal first shoulder
- Internal Drive Style
- slot
- Nominal Thread Diameter
- 0.190 inches
- Thread Quantity Per Inch
- 32
- Shoulder Shape
- round first shoulder
- Special Features
- thread relief undercut 0.140 in. dia; 0.055 in. lg; surface finish on shoulder and bearing surface 32.0 microinches
- Material
- steel comp 303se overall
- Material Document And Classification
- astm a582 cond a assn std single material response overall
- Surface Treatment
- passivate overall
- Surface Treatment Document And Classification
- qq-p-35 ty 4 fed spec single treatment response overall
- Thread Series Designator
- unf
Related Parts
This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:
| Part Number | Name |
|---|---|
| 639AS3803 | Shoulder Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-01-283-9898?
Does the NSN 5305-01-283-9898 have a Schedule B code assigned?
Does NSN 5305-01-283-9898 require demilitarization?
Does NSN 5305-01-283-9898 contain precious materials?
Does NSN 5305-01-283-9898 contain hazardous materials?
When the NSN 5305-01-283-9898 was assigned to the Federal Catalog?
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