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21-1688 — CAPACITOR,FIXED,CERAMIC DIELECTR

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

21-1688: CAPACITOR,FIXED,CERAMIC DIELECTR.

CAPACITOR,FIXED,CERAMIC DIELECTR. Key specifications include material: STEEL COMP 410 OVERALL, nut_style: ROUND, nut_diameter: 1.360 INCHES MINIMUM AND 1.380 INCHES MAXIMUM IN, thread_class: 3B, nut_thickness: 0.320 INCHES MINIMUM AND 0.340 INCHES MAXIMUM IN, thread_series: UNEF. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-376-6826, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MRO→ MRO_GENERAL→ 21-1688
NSN: 5310-00-376-6826
NIINs: 003766826, 012438182
FSC: 5310 — Nuts and Washers
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL COMP 410 OVERALL
nut_styleROUND
nut_diameter1.360 INCHES MINIMUM AND 1.380 INCHES MAXIMUM IN
thread_class3B
nut_thickness0.320 INCHES MINIMUM AND 0.340 INCHES MAXIMUM IN
thread_seriesUNEF
hardness_rating30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND
countersink_angle85.0 DEGREES MINIMUM AND 95.0 DEGREES MAXIMUM NUT
drive_point_depth0.220 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN
drive_point_width0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
nominal_thread_size1.000 INCHES IN
NSN5310-00-376-6826
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 21-1688 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THREAD SERIES: UNEF
•
HARDNESS RATING: 30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5613 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
DRIVE POINT WIDTH: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.000 INCHES IN
•
NUT DIAMETER: 1.360 INCHES MINIMUM AND 1.380 INCHES MAXIMUM IN
•
DRIVE POINT DEPTH: 0.220 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN
TYPICAL APPLICATIONS
  • RAID cache protection during power loss events
  • Write-back cache enablement for storage controllers
  • Enterprise server data integrity assurance
  • Hot-swap battery/capacitor replacement in production
TECHNICAL CHARACTERISTICS
THREAD SERIESUNEF
HARDNESS RATING30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5613 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
DRIVE POINT WIDTH0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.000 INCHES IN
NUT DIAMETER1.360 INCHES MINIMUM AND 1.380 INCHES MAXIMUM IN
DRIVE POINT DEPTH0.220 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN
NUT THICKNESS0.320 INCHES MINIMUM AND 0.340 INCHES MAXIMUM IN
COUNTERSINK ANGLE85.0 DEGREES MINIMUM AND 95.0 DEGREES MAXIMUM NUT
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 21-1688?
21-1688 is a CAPACITOR,FIXED,CERAMIC DIELECTR. It is classified as a MRO (MRO_GENERAL).
What is the NSN for 21-1688?
21-1688 is cataloged in the U.S. Government catalog under NSN 5310-00-376-6826. This indicates validated use in U.S. government and defense supply chains.
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