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2042-78 — PIN,STRAIGHT,HEADLESS

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

2042-78: PIN,STRAIGHT,HEADLESS.

The PIN,STRAIGHT,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4340 OVERALL, surface_finish: 32.0 MICROINCHES BOTH ENDS, first_end_style: COUNTERSUNK, hardness_rating: 50.5 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL, pin_overall_length: 8.000 INCHES MINIMUM AND 8.030 INCHES MAXIMUM IN, first_hole_diameter: 0.376 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5315-01-226-8514, 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
2042-78
NSN: 5315-01-226-8514
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 45934 — ONTIC ENGINEERING & MANUFACTURING, INC DBA ONTIC US (USA)
SPECIFICATIONS
materialSTEEL COMP 4340 OVERALL
surface_finish32.0 MICROINCHES BOTH ENDS
first_end_styleCOUNTERSUNK
hardness_rating50.5 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL
pin_overall_length8.000 INCHES MINIMUM AND 8.030 INCHES MAXIMUM IN
first_hole_diameter0.376 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
pin_overall_diameter1.8100 INCHES MINIMUM AND 1.8110 INCHES MAXIMUM IN
hole_arrangement_styleDRILLED THRU CENTER
first_end_countersink_angle60.0 DEGREES NOMINAL
criticality_code_justificationACHU
first_end_countersink_diameter1.120 INCHES NOMINAL IN
material_document_and_classificationMIL-S-8844,CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5315-01-226-8514
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2042-78 · 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
•
SURFACE FINISH: 32.0 MICROINCHES BOTH ENDS
•
FIRST END COUNTERSINK DIAMETER: 1.120 INCHES NOMINAL IN
•
HOLE ARRANGEMENT STYLE: DRILLED THRU CENTER
•
FIRST END STYLE: COUNTERSUNK
•
FIRST HOLE DIAMETER: 0.376 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
•
HARDNESS RATING: 50.5 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL
•
CRITICALITY CODE JUSTIFICATION: ACHU
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-8844,CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES BOTH ENDS
FIRST END COUNTERSINK DIAMETER1.120 INCHES NOMINAL IN
HOLE ARRANGEMENT STYLEDRILLED THRU CENTER
FIRST END STYLECOUNTERSUNK
FIRST HOLE DIAMETER0.376 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
HARDNESS RATING50.5 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM OVERALL
CRITICALITY CODE JUSTIFICATIONACHU
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-8844,CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
PIN OVERALL DIAMETER1.8100 INCHES MINIMUM AND 1.8110 INCHES MAXIMUM IN
PIN OVERALL LENGTH8.000 INCHES MINIMUM AND 8.030 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5315 — Nails, Machine Keys, and Pins
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5315-00-000-1037 5315-00-000-1067 5315-00-000-1245 5315-00-000-1372 5315-00-000-1412 5315-00-001-1571 5315-00-001-1572 5315-00-001-1602
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 2042-78?
2042-78 is a PIN,STRAIGHT,HEADLESS.
What is the NSN for 2042-78?
2042-78 is cataloged in the U.S. Government catalog under NSN 5315-01-226-8514. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
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.