The Block,tackle, cataloged under National Stock Number 3940-00-239-8778, is classified within Federal Supply Class 3940 (No Item Name Available) of the Materials Handling Equipment group. The primary manufacturer of record is Federal Specifications Promulgated by General Services Administration Washington DC. Government technical data includes 28 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3940-00-239-8778 |
| Primary Part Number | GG-B-500 |
| Item Name | Block,tackle |
| FSC / FSG | 3940 / 39 — No Item Name Available |
| Manufacturer | Federal Specifications Promulgated by General Services Administration Washington DC |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-Z-17871 MIL SPEC SINGLE TREATMENT RESPONSE SHEAVE |
| Maximum Tackle Diameter Accommodated | 0.625 INCHES IN |
| Tackle Locking Device | NOT INCLUDED |
| Sheave Quantity | 2 |
| Sheave Bearing Lubrication Method | SELF-LUBRICATED |
| Antitoppling Device | NOT INCLUDED |
| Block Type | REGULAR |
| Becket Type | THIMBLE |
| Tackle Accommodated Type | WIRE ROPE |
| Attachment Style | FLATTED LOOSE SWIVEL EYE WITH SWIVEL HOOK |
| Sheave Outside Diameter | 10.000 INCHES NOMINAL IN |
| Becket Quantity | 1 |
| Surface Treatment | ZINC CENTER PIN |
| Material | STEEL CENTER PIN |
| Surface Treatment Document and Classification | MIL-Z-17871 MIL SPEC SINGLE TREATMENT RESPONSE CENTER PIN |
| Material Document and Classification | QQ-S-681 FED SPEC SINGLE MATERIAL RESPONSE SHEAVE |
| Bearing Type | PLAIN |
| Surface Treatment Document and Classification | MIL-Z-17871 MIL SPEC SINGLE TREATMENT RESPONSE SHELL |
| Style Designator | DIAMOND PATTERN |
| Surface Treatment | ZINC SHEAVE |
| Material Document and Classification | MIL-B-5687 TYPE 1 COMP A MIL SPEC SINGLE MATERIAL RESPONSE BEARING |
| Nondefinitive Spec/std Data | 2 TYPE AND A GRADE AND 2 STYLE |
| Material | STEEL SHEAVE |
| Surface Treatment | ZINC SHELL |
| Material | STEEL SHELL |
| Material Document and Classification | QQ-S-741 FED SPEC SINGLE MATERIAL RESPONSE SHELL |
| Material | COPPER ALLOY BEARING |
| Load Rating | 600.0 POUNDS MAXIMUM LBS |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| GG-B-500 | Federal Specifications Promulgated by General Services Administration Washington DC (USA) |
NSN 3940-00-239-8778 is a Block,tackle, manufactured by Federal Specifications Promulgated by General Services Administration Washington DC, classified under FSC 3940 (No Item Name Available). Status: active.
NSN 3940-00-239-8778 has 1 cross-referenced part number: GG-B-500 (Federal Specifications Promulgated by General Services Administration Washington DC).
There are 2 known substitutes for 3940-00-239-8778: 3940-00-246-8841, 3940-00-272-9308. Verify interchangeability with system specifications before substitution.
Key specifications for GG-B-500: Surface Treatment Document and Classification: MIL-Z-17871 MIL SPEC SINGLE TREATMENT RESPONSE SHEAVE; Maximum Tackle Diameter Accommodated: 0.625 INCHES IN; Tackle Locking Device: NOT INCLUDED; Sheave Quantity: 2. 28 total characteristics are documented in the Federal Logistics Information System.