NAS1248-20
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An externally threaded fastener whose threaded portion is of one nominal diameter, no 0 (0.060 in.) (1.5 mm) or larger. It has a round unthreaded neck or shank all or part of which is of greater diameter than the threaded portion. The head is designed to be driven with either a wrench or an inserted driver or both in sizes below no. 10 (0.190 in.) (5 mm) nominal diameter. No. 10 (0.190 in.) (5 mm) and larger sizes must be designed for any type of inserted driver, but may also provide for external wrenching of the head. A locking feature may be incorporated in the design of the head or threads. For items which are both shouldered and have an externally relieved body, use screw, externally relieved body. For items with a no. 10 (0.190 in.) (5 mm) or larger thread diameter without an inserted driver head, use bolt, shoulder. Excludes:bolt, internal wrenching and screw, cap, socket head.
1.688 inches minimum and 1.718 inches maximum fastener length, right-hand thread direction, 3a thread class, flat countersunk head style, 0.453 inches maximum thread 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
- 0.453 inches maximum
- Fastener Length
- 1.688 inches minimum and 1.718 inches maximum
- Head Style
- flat countersunk
- Head Diameter
- 0.951 inches minimum and 1.014 inches maximum
- Shoulder Diameter
- 0.5141 inches minimum and 0.5151 inches maximum first shoulder
- Shoulder Length
- 1.240 inches minimum and 1.260 inches maximum first shoulder
- Internal Drive Style
- high-torque
- Nominal Thread Diameter
- 0.500 inches
- Thread Quantity Per Inch
- 20
- Minimum Tensile Strength
- 160000 pounds per square inch
- Countersink Angle
- 99.0 degrees minimum and 101.0 degrees maximum
- Shoulder Shape
- round first shoulder
- Material
- steel comp 4140 or steel comp 4340 or steel comp 8735 or steel comp 8740 or steel comp 6150 overall
- Material Document And Classification
- mil-s-5626 mil spec 1st material response or mil-s-5000 mil spec 2nd material response or mil-s-6098 mil spec 3rd material response or mil-s-6049 mil spec 4th material response or mil-s-8503 mil spec 5th material response overall
- Surface Treatment
- cadmium and chromate overall
- Surface Treatment Document And Classification
- qq-p-416, type 2, class 2 fed spec all treatment responses overall
- Thread Series Designator
- unjf
- Specification/Standard Data
- 80205-nas1248 professional/industrial association standard
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 |
|---|---|
| NAS1248-20 | Shoulder Screw |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5305-01-434-8161?
Does the NSN 5305-01-434-8161 have a Schedule B code assigned?
Does NSN 5305-01-434-8161 require demilitarization?
Does NSN 5305-01-434-8161 contain precious materials?
Does NSN 5305-01-434-8161 contain hazardous materials?
When the NSN 5305-01-434-8161 was assigned to the Federal Catalog?
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