NASM51989
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A rigid or flexible item of various shapes attached to a structure for the purpose of providing access for inspection, service, replacement of components and/or adjustments or mounting operations. It is designed to be attached by means of bolt holes, slots, mounting ears, tabs, and the like. To permit access, the mounted cover requires partial or complete removal. It may include an observation window. For items permanently attached by hinges and the like, see door, access (as modified). Excludes:all covers not specifically designed to provide access for the purposes listed above.
+0.1639 to 0.1654 inches stud thread thread pitch diameters, right-hand stud thread thread direction, right-hand nut thread thread direction, 0.215 inches minimum and 0.245 inches maximum stud thread thread length, 3a nut thread thread class
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 nut thread
- Thread Pitch Diameters
- +0.1639 to 0.1654 inches stud thread
- Thread Direction
- right-hand nut thread
- Thread Direction
- right-hand stud thread
- Thread Length
- 0.215 inches minimum and 0.245 inches maximum stud thread
- Thread Length
- 0.395 inches minimum and 0.425 inches maximum nut thread
- Locking Feature
- ring, lock serrated
- Overall Length
- 1.100 inches minimum and 1.160 inches maximum
- Distance From Serrated Portion To Nut End
- 0.735 inches minimum and 0.765 inches maximum
- Distance From Serrated Portion To Stud End
- 0.365 inches minimum and 0.395 inches maximum
- Distance From Serrated Portion To End Of Stud Thread
- 0.120 inches minimum and 0.180 inches maximum
- Thread Quantity Per Inch
- 24 stud thread
- Thread Quantity Per Inch
- 32 nut thread
- Hardness Rating
- 26.0 rockwell c minimum
- Nominal Thread Size
- 0.164 inches nut thread
- Nominal Thread Size
- 0.190 inches stud thread
- Surface Finish
- 32.0 microinches nut thd
- Serration Included Angle
- 90.0 degrees nominal
- Material
- steel comp 4130
- Material Document And Classification
- mil-s-6758 mil spec single material response
- Surface Treatment
- cadmium and chromate overall
- Surface Treatment Document And Classification
- qq-p-416,type 2 class 3 fed spec single treatment response overall
- Style Designator
- locked in
- Thread Series Designator
- unc nut thread
- Thread Series Designator
- unc stud thread
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 |
|---|---|
| MS51989-303-12 | Locked in Stud |
| NASM51989 | Locked in Stud |
FAQs
Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.
What is the FSCG of the NSN 5307-01-211-0770?
Does NSN 5307-01-211-0770 require demilitarization?
Does NSN 5307-01-211-0770 contain precious materials?
Does NSN 5307-01-211-0770 contain hazardous materials?
When the NSN 5307-01-211-0770 was assigned to the Federal Catalog?
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