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GP1-031X187-50 — PIN,GROOVED,HEADLESS

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

GP1-031X187-50: PIN,GROOVED,HEADLESS.

The PIN,GROOVED,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, overall_length: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN, style_designator: FULL LENGTH GROOVE, pin_large_end_diameter: 0.031 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN, pin_small_end_diameter: 0.030 INCHES MINIMUM AND 0.031 INCHES MAXIMUM IN, material_document_and_classification: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5315-00-415-1256, 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
GP1-031X187-50
NSN: 5315-00-415-1256
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 73957 — GROOV-PIN CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
overall_length0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN
style_designatorFULL LENGTH GROOVE
pin_large_end_diameter0.031 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
pin_small_end_diameter0.030 INCHES MINIMUM AND 0.031 INCHES MAXIMUM IN
material_document_and_classification66 FED STD SINGLE MATERIAL RESPONSE OVERALL
NSN5315-00-415-1256
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: GP1-031X187-50 · 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
•
STYLE DESIGNATOR: FULL LENGTH GROOVE
•
PIN LARGE END DIAMETER: 0.031 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
PIN SMALL END DIAMETER: 0.030 INCHES MINIMUM AND 0.031 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 303 OVERALL
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORFULL LENGTH GROOVE
PIN LARGE END DIAMETER0.031 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
OVERALL LENGTH0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN
PIN SMALL END DIAMETER0.030 INCHES MINIMUM AND 0.031 INCHES MAXIMUM IN
MATERIALSTEEL COMP 303 OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
900021-2Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is GP1-031X187-50?
GP1-031X187-50 is a PIN,GROOVED,HEADLESS.
What parts can replace GP1-031X187-50?
There is 1 known substitute for GP1-031X187-50: 900021-2. Substitute compatibility should be verified for your specific system.
What is the NSN for GP1-031X187-50?
GP1-031X187-50 is cataloged in the U.S. Government catalog under NSN 5315-00-415-1256. 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.