Home · FSC 5320 Rivets · NSN 5320-01-477-5631

NSN 5320-01-477-5631 — Pin-Rivet

NIIN 01-477-5631 · unit of issue EA · AAC Z (insurance item) · source of supply SMS

Buying rhythm

from 4 government buys since 2024

The government has bought this item about every 3 months (regular, gaps vary ±58%). Last buy Jun 30, 2025. If the rhythm holds, the next one falls between Aug 18, 2025 and Nov 24, 2025: a buy is overdue by the usual rhythm. 1 solicitation is open right now.

How well this works: for regular items, "next buy about one typical gap after the last, give or take 121 days" caught the actual next buy 42% of the time across 15,552 past buys, against 22% for a fixed "one year later" guess. A rhythm, not a schedule: DLA buys when stock and demand say so. Every item due for a buy now.

Used on: F/A-18 Hornet and Super Hornet · all platforms

NSN 5320-01-477-5631 is the national stock number for a pin-rivet in federal supply class 5320 (Rivets). It cross-references to 5 manufacturer part numbers from 11 CAGE codes, including Howmet Global Fastening Systems Inc Div Torrance Operations, Huck International, Inc, Sps Technologies, LLC Dba Aerospace Fasteners Group Div Aerospace - Santa Ana; the primary is HLT631YB-8-9. The federal catalog ties it to the F/A-18 Hornet and Super Hornet. The unit of issue is EA and the FLIS list price is $3.98.

The U.S. government has bought this item 4 times on record, 3 of them in the last 24 months, most recently on June 30, 2025 at $3.26 each from Wesco Aircraft Hardware Corp.. The median unit price paid over 36 months is $2.85. 2 solicitations are open right now, the soonest due October 7, 2026 for 272 EA. No seller has confirmed stock of it here in the last 60 days; watching the number is free and the first listing triggers an alert.

part numbers from 11 CAGEs

open solicitations, all agencies

government buys in 24 months · median $2.85

sellers with confirmed stock

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Cross-references

Part numbers filed against this stock number, with the manufacturer (CAGE) and the FLIS reference codes.

Part number	CAGE	Manufacturer	Reference	Variation
HLT631YB-8-9	92215	Howmet Global Fastening Systems Inc Div Torrance Operations	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YB-8-9	17446	Huck International, Inc	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YB-8-9	80539	Sps Technologies, LLC Dba Aerospace Fasteners Group Div Aerospace - Santa Ana	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YB-8-9	06725	Sps Technologies, LLC	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YB-8-9	K5673	Sps Technologies Ltd, Tj Brooks Division	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YB-8-9	56878	Sps Technologies, LLC	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YB-8-9	73197	Hi-Shear Corporation	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YC-8-9	17446	Huck International, Inc	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YC-8-9	73197	Hi-Shear Corporation	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YC-8-9	80539	Sps Technologies, LLC Dba Aerospace Fasteners Group Div Aerospace - Santa Ana	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YC-8-9	92215	Howmet Global Fastening Systems Inc Div Torrance Operations	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YC-8-9	K5673	Sps Technologies Ltd, Tj Brooks Division	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YC-8-9	06725	Sps Technologies, LLC	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YC-8-9	56878	Sps Technologies, LLC	3 · Design control (vendor)	2 · Fully interchangeable
HP4758D4-9	0ZC92	Heartland Precision Fasteners Inc	3 · Design control (vendor)	2 · Fully interchangeable
ST3M578D4-9	58998	Fastener Innovation Technology, Inc.	3 · Design control (vendor)	2 · Fully interchangeable
HLT631YB-8-9	60516	West Coast Aerospace, Inc.	5 · Secondary reference	2 · Fully interchangeable
HLT631YC-8-9	60516	West Coast Aerospace, Inc.	5 · Secondary reference	2 · Fully interchangeable
ST3M758D4-9	76301	The Boeing Company	5 · Secondary reference	2 · Fully interchangeable

Government demand

Open DLA RFQs (DIBBS)

SPE4A626U4412 · 272 EA · due Oct 7, 2026 · Y · AMSC C · DIBBS

Open notices, other agencies (SAM.gov)

Defense Logistics Agency · Dla Aviation · PIN-RIVET · due Oct 7, 2026 · Combined Synopsis/Solicitation

What the government paid

Date	Vendor	Qty	Unit cost	Buyer	Reference
Jun 30, 2025	Wesco Aircraft Hardware Corp. 1V757	354	$3.26	Dla	SPE4A625PY124
Jan 8, 2025	Boeing Distribution Services X, Inc. 2N935	515	$2.85	Dla	SPE4A625PA945
Oct 16, 2024	Boeing Distribution Services X, Inc. 2N935	35	$2.85	Dla	SPE4A625V0955
Sep 10, 2024	Boeing Distribution Services X, Inc. 2N935	35	$2.85	Dla	SPE4A624V472V

Sources: DLA DIBBS procurement history (unit cost), DLA award history, FPDS (all agencies), SAM.gov notices. 4 buys on record in total.

Sellers with confirmed stock

No seller has confirmed stock on this NSN in the last 60 days. Watch it and we will email you when one does, or request a quote on HLT631YB-8-9.

Listings appear here only while the seller has confirmed them within 60 days. Sellers: list this part free.

DLA management data

FLIS unit price: $3.98
Unit of issue: EA
Acquisition advice: Z — Insurance item
Source of supply: SMS
Effective: Oct 1, 2025

Item characteristics

Thread Class: 3A
Thread Direction: RIGHT-HAND
Fastener Length: INCHES MINIMUM 0.948 AND INCHES MAXIMUM 0.968
Width Between Flats: INCHES MINIMUM 0.122 AND INCHES MAXIMUM 0.142
Shank Diameter: INCHES MINIMUM 0.2490 AND INCHES MAXIMUM 0.2495
Head Major Diameter: INCHES MINIMUM 0.3898 AND INCHES MAXIMUM 0.3948
End Item Identification: F-18E/F
Grip Length: INCHES MINIMUM 0.558 AND INCHES MAXIMUM 0.568
Thread Quantity Per Inch: 28
Nominal Thread Size: INCHES 0.250
Countersink Angle: DEGREES NOMINAL 100.0
Part Name Assigned By Controlling Agency: PIN-RIVET,THREADED,SHEAR, 100 DEGREE C'SHUNK HEAD,HEX POINT DRIVE
Material: OVERALL STEEL COMP XM-13
Material Document And Classification: OVERALL ASSN STD SINGLE MATERIAL RESPONSE A-S 5629
Thread Series Designator: UNIFIED NATIONAL JOINT FINE (UNJF)

About this page

An NSN is 13 digits: the 4-digit Federal Supply Class and the 9-digit NIIN. Cross-references come from the federal logistics record; demand from DLA DIBBS, SAM.gov and FPDS; ADs from the Federal Register. Refreshed nightly. Market Pulse shows the whole market.