Cross reference · MS (US military standards) · Screw thread insert
MS51991 cross reference
MS51991 is a screw thread insert series on 27 government stock numbers. Each one is labeled with how strong the evidence is.
- Issued by MS
- Item Screw thread insert
- Stock numbers 27
- Equivalents 16
- DLA paid $4.62 to $35.00
Equivalents in the government catalog
Catalog-only listings need engineering approval before you substitute.
Manufacturers
12 more on one stock number each: R106SA, R106SM, R108SB10L, R205SB7L, RAJ107SB, RAJ207SB, RD106SB, RD106SB8L, RD313SN18L, RDJ205SB, RDJ313SN18L, RJ104SB
- R106SAHowmet Fastening SystemsCatalog only, needs approvalon 1 of 27 stock numbers
- R106SMHowmet Fastening SystemsCatalog only, needs approvalon 1 of 27 stock numbers
- R108SB10LHowmet Fastening SystemsCatalog only, needs approvalon 1 of 27 stock numbers
- R205SB7LHowmet Fastening SystemsCatalog only, needs approvalon 1 of 27 stock numbers
- RAJ107SBHowmet Fastening SystemsCatalog only, needs approvalon 1 of 27 stock numbers
- RAJ207SBHowmet Fastening SystemsCatalog only, needs approvalon 1 of 27 stock numbers
- RD106SBHowmet Fastening SystemsCatalog only, needs approvalon 1 of 27 stock numbers
- RD106SB8LHowmet Fastening SystemsCatalog only, needs approvalon 1 of 27 stock numbers
- RD313SN18LHowmet Fastening SystemsCatalog only, needs approvalon 1 of 27 stock numbers
- RDJ205SBHowmet Fastening SystemsCatalog only, needs approvalon 1 of 27 stock numbers
- RDJ313SN18LHowmet Fastening SystemsCatalog only, needs approvalon 1 of 27 stock numbers
- RJ104SBHowmet Fastening SystemsCatalog only, needs approvalon 1 of 27 stock numbers
Airframer and OEM drawings
4 more on one stock number each: GB540B12N, GB540B12N36J, PWA8661, R205SB
- GB540B12NNorthrop GrummanCatalog only, needs approvalon 1 of 27 stock numbers
- GB540B12N36JNorthrop GrummanCatalog only, needs approvalon 1 of 27 stock numbers
- PWA8661RTXCatalog only, needs approvalon 1 of 27 stock numbers
- R205SBGECatalog only, needs approvalon 1 of 27 stock numbers
Plus 9 reference numbers whose issuer SpecLok does not identify (distributors and catalog agencies are not named).
Get quotes for MS51991
Cited equivalents go on the request as acceptable alternates. Catalog-only listings do not.
Install tooling
SpecLok has no catalog family for MS51991. Tooling for the equivalents:
None of the equivalents is in the SpecLok catalog yet.
What the government paid
DLA awards on 5 of 27 stock numbers, 18 awards from 2023-03-22 to 2026-04-22.
Latest award per stock number: $4.62 to $35.00 each.
DLA production lead time: 28 to 450 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 | MS51991 | Last DLA price |
|---|---|---|
| 5325-00-019-9455 | MS51991-104 | $19.50 2024-12 |
| 5325-00-009-7115 | MS51991-105 | |
| 5325-00-158-4053 | MS51991-106 | |
| 5325-00-151-5932 | MS51991-107 | $35.00 2025-07 |
| 5325-00-158-4052 | MS51991-108 | |
| 5325-01-186-1844 | MS51991-110 | |
| 5325-00-290-5124 | MS51991-205 | $4.62 2026-04 |
| 5325-00-177-4223 | MS51991-206 | $14.85 2025-05 |
| 5325-00-176-0327 | MS51991-207 | |
| 5325-00-019-9448 | MS51991-208 | $23.96 2025-07 |
| 5325-00-177-4224 | MS51991-210 | |
| 5325-00-448-4655 | MS51991-311 | |
| 5325-01-611-3501 | MS51991-313 | |
| 5325-01-294-5483 | MS51991-102L | |
| 5325-01-267-1872 | MS51991-104L |
Show 12 more sizes
| NSN | MS51991 | Last DLA price |
|---|---|---|
| 5325-01-356-2325 | MS51991-105L | |
| 5325-00-597-9895 | MS51991-106L | |
| 5325-00-559-8031 | MS51991-108L | |
| 5325-01-315-3642 | MS51991-110L | |
| 5325-00-448-4826 | MS51991-205L | |
| 5325-00-079-9950 | MS51991-206L | |
| 5325-00-003-9317 | MS51991-207L | |
| 5325-00-451-8991 | MS51991-208L | |
| 5325-01-116-9300 | MS51991-209L | |
| 5325-00-451-8992 | MS51991-210L | |
| 5325-00-119-4658 | MS51991-312L | |
| 5325-00-759-1677 | MS51991-313L |
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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