The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-00-012-1887, is classified within Federal Supply Class 5305 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Cummins Inc.. Government technical data includes 19 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 18 commercial cross-references from 15 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 5305-00-012-1887 |
| Primary Part Number | S188C |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — No Item Name Available |
| Manufacturer | Cummins Inc. |
| Status | CANCELLED |
| Fastener Length | 0.750 INCHES NOMINAL IN |
| Head Style | HEXAGON |
| Hardness Rating | 80.0 ROCKWELL B MINIMUM AND 100.0 ROCKWELL B MAXIMUM OVERALL |
| Thread Direction | RIGHT-HAND |
| Surface Finish | 63.0 MICROINCHES THREADS |
| Material | STEEL OVERALL |
| Surface Finish | 125.0 MICROINCHES BEARING SURFACE OF HEAD |
| Material Document and Classification | SAE GR 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Length | 0.750 INCHES MAXIMUM IN |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Thread Class | 2A A |
| Head Height | 0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM IN |
| Nondefinitive Spec/std Data | 2 TYPE AND 10P STYLE AND 2 GRADE |
| Width Between Flats | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 2,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL |
| Minimum Tensile Strength | 74000 POUNDS PER SQUARE INCH LBS |
| Thread Quantity Per Inch | 20 |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| GM121887 | General Motors Corp (USA) |
| 400684 | Kline Manufacturing Co Inc (USA) |
| 1000-812 | Kaitlin Corp (USA) |
| 121887 | General Motors Corp (USA) |
| S188C PRIMARY | Cummins Inc. (USA) |
| GM121887 | General Motors Llc Dba General Motors Llc (USA) |
| 21740 | Prestolite Electric Inc (USA) |
| FFS85 | Federal Specifications Promulgated by General Services Administration Washington DC (USA) |
| SHC250SC6 PRIMARY | Bae Systems Information and Electronic Systems Integration Inc. (USA) |
| 1-4 20X3-4 | Lauson Division of Tecumseh Products Co (USA) |
| 121887 PRIMARY | General Motors Llc Dba General Motors Llc (USA) |
| 101-2S4-3 PRIMARY | Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir (USA) |
| D9485-26-26 | Met-Pro Corporation (USA) |
| 900037-1 | Joy Global Underground Mining Llc (USA) |
| 23MS35291-6 PRIMARY | L3harris Cincinnati Electronics Corporation (USA) |
| 121887 PRIMARY | Us Army Aviation and Missile Command (USA) |
| 900037-1 | Joy Mfg Co Air Power Group Michigan City Plant (USA) |
| 21740 | Prestolite Electric Inc (USA) |
NSN 5305-00-012-1887 is a Screw,cap,hexagon Head, manufactured by Cummins Inc., classified under FSC 5305 (No Item Name Available). Status: cancelled.
NSN 5305-00-012-1887 has 18 cross-referenced part numbers: GM121887 (General Motors Corp), 400684 (Kline Manufacturing Co Inc), 1000-812 (Kaitlin Corp), 121887 (General Motors Corp), S188C (Cummins Inc.) and 13 more.
There are 12 known substitutes for 5305-00-012-1887: 5905-00-223-2741, 6685-00-442-7219, 6220-00-673-4971 and 9 more. Verify interchangeability with system specifications before substitution.
Key specifications for S188C: Fastener Length: 0.750 INCHES NOMINAL IN; Head Style: HEXAGON; Hardness Rating: 80.0 ROCKWELL B MINIMUM AND 100.0 ROCKWELL B MAXIMUM OVERALL; Thread Direction: RIGHT-HAND. 19 total characteristics are documented in the Federal Logistics Information System.
NSN 5305-00-012-1887 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.