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105278 — HEADSET-MICROPHONE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

105278: HEADSET-MICROPHONE.

The HEADSET-MICROPHONE is a the manufacturer industrial component. Key specifications include material: STEEL, ring_style: EXTERNAL, usage_design: EXTERNAL, end_similarity: IDENTICAL, overall_length: 715.0 MILLIMETERS NOMINAL MM, first_end_style: EXTERNAL THREADED. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-803-9978, 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
105278
NSN: 5325-00-803-9978
NIINs: 008039978, 010889315, 012866548, 014397626
FSC: 5325 — Fastening Devices
CAGE: 61465 — GARWOOD/FELLER INC GARWOOD WINCH DIV (USA)
SPECIFICATIONS
materialSTEEL
ring_styleEXTERNAL
usage_designEXTERNAL
step_quantity5
end_similarityIDENTICAL
overall_length715.0 MILLIMETERS NOMINAL MM
first_end_styleEXTERNAL THREADED
inside_diameter1.257 INCHES MINIMUM AND 1.282 INCHES MAXIMUM IN
major_thickness0.048 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN
special_featuresWEAPON SYSTEM ESSENTIAL
first_end_diameter23.5 MILLIMETERS MINIMUM AND 23.9 MILLIMETERS MAXIMUM MM
largest_step_diameter50.6 MILLIMETERS MINIMUM AND 51.0 MILLIMETERS MAXIMUM MM
NSN5325-00-803-9978
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 105278 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL HARDNESS RATING: 47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
•
USAGE DESIGN: EXTERNAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD 66 AISI 1066 OR 1069 OR 1070 OR 1072 OR 1074 OR 1075 OR 1078 OR 1080 OR 1084 OR 1086 OR 1090 FED STD SINGLE MATERIAL RESPONSE
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
MAJOR THICKNESS: 0.048 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN
•
INSIDE DIAMETER: 1.257 INCHES MINIMUM AND 1.282 INCHES MAXIMUM IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
RING STYLE: EXTERNAL
TECHNICAL CHARACTERISTICS
MATERIAL HARDNESS RATING47.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM
USAGE DESIGNEXTERNAL
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD 66 AISI 1066 OR 1069 OR 1070 OR 1072 OR 1074 OR 1075 OR 1078 OR 1080 OR 1084 OR 1086 OR 1090 FED STD SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
MAJOR THICKNESS0.048 INCHES MINIMUM AND 0.052 INCHES MAXIMUM IN
INSIDE DIAMETER1.257 INCHES MINIMUM AND 1.282 INCHES MAXIMUM IN
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLEEXTERNAL
MATERIALSTEEL COMP 1066 OR STEEL COMP 1069 OR STEEL COMP 1070 OR STEEL COMP 1072 OR STEEL COMP 1074 OR STEEL COMP 1075 OR STEEL COMP 1078 OR STEEL COMP 1080 OR STEEL COMP 1084 OR STEEL COMP 1086 OR STEEL COMP 1090
SUBSTITUTES & CROSS-REFERENCES 8
5100-137Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
A107M36Reference document
Same NSN cross-reference
Reference document — Secondary reference
D6142-15-8Reference document
Same NSN cross-reference
Reference document — Secondary reference
X100T1AReference document
Same NSN cross-reference
Reference document — Secondary reference
MIL-DTL-21248Reference document
Same NSN cross-reference
Reference document — Identification reference
315015 ITEM 20Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 105278?
105278 is a HEADSET-MICROPHONE.
What parts can replace 105278?
There are 8 known substitutes for 105278: 5100-137, A107M36, D6142-15-8 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 105278?
105278 is cataloged in the U.S. Government catalog under NSN 5325-00-803-9978. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.