Nut, Self-Locking, Spline5310-00-997-6991

NSN 5310-00-997-6991 · NIIN 009976991 · Part number EK1BS1-4-28C

Nylok Llc · FSC 5310 — Nuts and Washers · FSG 53 — Hardware and Abrasives · CAGE 26233

Government record, cited

NSN 5310-00-997-6991 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-997-6991. Manufacturer of record part number: EK1BS1-4-28C.

Also searched as 5310-00-997-6991 · 5310009976991 · NIIN 009976991 · 00-997-6991 · FSC 5310 Nuts and Washers · CAGE 26233 · EK1BS1-4-28C

Nearby stock numbers ← 5310-00-997-6990 · 5310-00-997-6992 →

5310-00-997-6991 — Nuts and Washers

Features

Nut,self-Locking,spline — FSC 5310
1 manufacturer part number on file
Manufacturer of record: Nylok Llc

Identification

NSN: 5310-00-997-6991
NIIN: 009976991
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
Primary part number: EK1BS1-4-28C
Manufacturer: Nylok Llc

General Description

The Nut,self-Locking,spline, cataloged under National Stock Number 5310-00-997-6991, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Nylok Llc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Catalog Facts

Item Name	Nut,self-Locking,spline
FSC / FSG	5310 — Nuts and Washers (FSG 53)
Manufacturers	Nylok Llc (CAGE 26233)

Technical Specifications

Parameter	Value
NSN	5310-00-997-6991
Primary Part Number	EK1BS1-4-28C
Item Name	Nut,self-Locking,spline
FSC / FSG	5310 / 53 — Nuts and Washers
Manufacturer	Nylok Llc
Status	ACTIVE

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)

Cross-Reference Index

Part Number	Manufacturer
EK1BS1-4-28C PRIMARY	Nylok Llc (USA)

No interchangeability data on file.

Other items in FSC 5310 — Nuts and Washers

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5310-00-000-0040

5310-00-000-0040 · Item name not on file

5310-00-000-0077

NUT,PLAIN,ROUND

5310-00-000-0079

WASHER,FLAT

5310-00-000-0079

WASHER,FLAT

5310-00-000-1146

5310-00-000-1146 · Item name not on file

5310-00-000-3815

5310-00-000-3815 · Item name not on file

5310-00-000-4532

5310-00-000-4532 · Item name not on file

5310-00-000-4540

5310-00-000-4540 · Item name not on file

Frequently Asked Questions

What is NSN 5310-00-997-6991?

NSN 5310-00-997-6991 is a Nut,self-Locking,spline, manufactured by Nylok Llc, classified under FSC 5310, Nuts and Washers. Status: active.

What part numbers are listed for NSN 5310-00-997-6991?

NSN 5310-00-997-6991 has 1 manufacturer part number on file: EK1BS1-4-28C (Nylok Llc).

Is NSN 5310-00-997-6991 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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