Cross reference · Boeing · Screw thread insert
CTS310A cross referenceMS51831A
CTS310A is a Boeing screw thread insert series on 6 government stock numbers. Its closest equivalents are MS51831A. Each one is labeled with how strong the evidence is.
- Issued by Boeing
- Item Screw thread insert
- Stock numbers 6
- Equivalents 10
- DLA paid $18.70
Equivalents in the government catalog
Catalog-only listings need engineering approval before you substitute.
Manufacturers
6 more on one stock number each: KH9900, KH9905, KNH420JMSY, KNH420JMXSY, KNH518J, KNH616JMXSY
- KH9900Howmet Fastening SystemsCatalog only, needs approvalon 1 of 6 stock numbers
- KH9905Howmet Fastening SystemsCatalog only, needs approvalon 1 of 6 stock numbers
- KNH420JMSYHowmet Fastening SystemsCatalog only, needs approvalon 1 of 6 stock numbers
- KNH420JMXSYHowmet Fastening SystemsCatalog only, needs approvalon 1 of 6 stock numbers
- KNH518JHowmet Fastening SystemsCatalog only, needs approvalon 1 of 6 stock numbers
- KNH616JMXSYHowmet Fastening SystemsCatalog only, needs approvalon 1 of 6 stock numbers
Standards
- MS51831AMSCatalog only, needs approvalon 3 of 6 stock numbers, 3 sizes
3 more on one stock number each: MS51830A106L, MS51830A110L, MS51831
- MS51830A106LMSCatalog only, needs approvalon 1 of 6 stock numbers
- MS51830A110LMSCatalog only, needs approvalon 1 of 6 stock numbers
- MS51831MSCatalog only, needs approvalon 1 of 6 stock numbers
Plus 1 reference number whose issuer SpecLok does not identify (distributors and catalog agencies are not named).
Get quotes for CTS310A
Cited equivalents go on the request as acceptable alternates. Catalog-only listings do not.
Install tooling
SpecLok has no catalog family for CTS310A. Tooling for the equivalents:
- Threaded inserts (key-locked MS51830 / Keenserts, helical coil MS21209) tooling for MS51830A106L, MS51830A110L
What the government paid
DLA awards on 1 of 6 stock numbers, 2 awards from 2024-02-14 to 2025-08-18.
Latest award per stock number: $18.70 each.
DLA production lead time: 100 to 197 days.
Per size in the table below.
DLA prices at DLA quantities, not a quote.Source
DLA award prices at DLA quantities and terms, not a commercial quote. Each award may bundle packaging, delivery and inspection terms that a commercial buy does not. Vendors are shown by CAGE code only.
Source: DLA FOIA Electronic Reading Room ↗, public FOIA releases. Files: 2023ContHist.zip/2023ContractHistory.txt, 2024ContHist.zip/2024ContractHistory.txt, contracthist2025.zip/contracthist2025.txt, 2026-09-16-1038_contracthist.zip/2026-09-16-1038_contracthist.txt.
Sizes by maker
| NSN | CTS310A | KH9900 | MS51831A | Last DLA price |
|---|---|---|---|---|
| 5325-01-309-7984 | CTS310A-2 | $18.70 2025-08 | ||
| 5325-01-309-8773 | CTS310A-5 | |||
| 5325-01-132-6829 | CTS310A-13 | MS51831A102 | ||
| 5325-00-952-0432 | CTS310A-14 | |||
| 5325-01-054-6149 | CTS310A-15 | KH9900-616 | MS51831A104 | |
| 5325-01-286-7321 | CTS310A-19 | MS51831A109 |
Each row is one National Stock Number and the part numbers DLA FLIS lists on it, as written there. A blank means FLIS lists no part in that series on the stock number, not that the size does not exist.
Sources and how to read this page.Details
Reference numbers the Federal Logistics Information System records against the same National Stock Number. A supply-catalog cross-reference, not an engineering-approved interchangeability: confirm against the controlling drawing or spec before substituting. Only equivalents marked cited have a manufacturer or government document, linked with each.
Source: DLA Federal Logistics Information System, via DLA PUB LOG ↗ (FLIS Data Electronic Reading Room ↗), data as of 2025-03-18 (March 2025 snapshot). Federal supply class 5325 Fastening devices. Issuer names are SpecLok's reading of the filing CAGE code; distributors are not named. Compiled 2026-10-02.
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