# NSN 6635-00-663-4576: Tester, Material Hardness

NSN 6635-00-663-4576 (also written 6635006634576; NIIN 00-663-4576) is a tester, material hardness in Federal Supply Class 6635, Physical Properties Testing and Inspection Equipment. 5 manufacturer part numbers from 4 suppliers are on record. The government has 1 open solicitation for it.

## Identification

- NSN: 6635-00-663-4576 (6635006634576)
- NIIN: 00-663-4576 (006634576)
- Item name: TESTER,MATERIAL HARDNESS
- Federal Supply Class: [FSC 6635 Physical Properties Testing and Inspection Equipment](https://nsnexplorer.com/fsc/6635/)
- Federal Supply Group: [FSG 66](https://nsnexplorer.com/group/66/)
- Acquisition method suffix code: AMSC D: the data needed to compete the part is unavailable or cannot be obtained economically. (observed 2026-10-13)
- Acquisition method code: 3

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| BCKW | INDICATOR READING TYPE | MULTIPLE |
| BCKS | VERTICAL CAPACITY | INCHES 12.000 |
| BCKT | HORIZONTAL REACH | INCHES 5.500 |
| NTRD | ENTRY DATE | 70-08-15 |
| RDAL | REFERENCE DATA AND LITERATURE | TM 55-405-10 AND ROCKWELL HARDNESS TESTER BOOK |
| BCKX | INDICATOR DESIGN | CONVERSION CHART |
| TMDN | TYPE/MODEL DESIGNATION | OUR |
| CTJS | UNPACKAGED UNIT WEIGHT | POUNDS MAXIMUM 100.000 |
| FCLS | FUNCTIONAL CLASSIFICATION | AA-8.6 |
| AQYF | TEST TYPE | ROCKWELL |
| AKYD | ACCESSORY COMPONENTS AND QUANTITY | ANVIL,FLAT,APPROXIMATELY 2.500 IN. DIA 1; ANVIL,RAISED SPOT 1; ANVIL,RAISED V,FOR SMALL DIA WORK 1; ANVIL,V,FOR 0.250 IN. TO 5.000 IN. DIA STOCK 1; CHUCK,0.062 IN. STEEL BALL PENETRATOR W/50 BALLS 1; COVER,TELESCOPIC ELEVATING SCREW 1; COVER,VINYL PLASTIC 1; PENETRATOR,DIAMOND C SCALE 1; WEIGHTS,FOR APPLYING 60 KG,100 KG,150 KG MAJOR LOADS 1 SET; TABLE,TESTING,8 IN. DIA 1; TEST BLOCKS FOR B SCALE 2; TEST BLOCKS FOR C SCALE 2 |
| ALBY | USAGE DESIGN | EXTERNAL |
| AMKD | INDICATOR TYPE | CIRCULAR DIAL |
| AMQY | INSTALLATION DESIGN | BENCH |
| RTSE | RELATIONSHIP TO SIMILAR EQUIPMENT | OUR IS REGULAR MODEL; OUS SUPERFICIAL MODEL 6635-00-509-5238 MAKES SMALLER INDENTATIONS |
| FTLD | FUNCTIONAL DESCRIPTION | BALL-CHECK DETERMINES HARDNESS OF RELATIVELY SOFT MATL; SPHERE-CONICAL DIAMOND PENETRATOR (BRALE) TESTS HARDER MATL SUCH AS TOOL OR SPRING STEEL; MEAS DP PENETRATION OF BALL OR BRALE CHECK; READINGS REFER TO RELATIONSHIP TABLE FOR TS OF MATL |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 12B | 1G0P4 | SUN TEC CORP | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 12B | 31060 | SERVICE DIAMOND TOOL COMPANY DBA SERVICE PHYSICAL TESTERS DIV DIV SERVICE PHYSICAL TESTERS | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 4-OUR | 82729 | PAGE-WILSON CORP MEASUREMENT SYSTEMS | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 4OUR | 82729 | PAGE-WILSON CORP MEASUREMENT SYSTEMS | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| C12A | 12665 | THE CLARK-ELIANCE CORP | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Open solicitations

| Solicitation | Quantity | Closes | Link |
| --- | --- | --- | --- |
| SPE4A6-27-T-1839 | 1 | 2026-10-20 | [DIBBS](https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=6635006634576&category=nsn) |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=6635006634576&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=6635006634576
- AMSC record: https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/
- All data is public U.S. government data; every row above links to its source record where one exists.

Canonical page: https://nsnexplorer.com/nsn/6635-00-663-4576/
JSON: https://nsnexplorer.com/api/nsn/6635-00-663-4576.json