Description
The UNF blank plug is used to seal additional openings on underwater equipment casings or to replace existing connector ports.
It is compatible with Subconn's blank plugs. The thread is in British standard, available in stainless steel and aluminum. The hexagonal bulkhead model feature an internal hex socket at the top for quick tightening and removal with a wrench.
The wrench socket of the bulkhead does not extend to the bottom. The retained circular step serves to protect the hatch cover, averting potential scratches during wrenching procedures.
Shipping List
For each UNF blank plug, the following items are included for the selected size.
- 1 x Plug
- 1 x O-ring
- 1 x UNF Stainless Steel Nut
- 1 x UNF Stainless Steel Washer
For each square-type UNF plug, the following items are included for the selected size.
- 1 x Square Plug
- 2 x O-ring
Specifications
| Item | SKU | Material | Appearance | O-ring Size | O-ring Material | Unit Price(US$) |
|---|---|---|---|---|---|---|
| 7/16-20 Plug | 13020302-0716 | 316 Stainless Steel | Original Stainless Steel Color | Ø12.42 x 1.78 | FKM75 Brown Fluorine Rubber | 8.5 |
| 7/16-20 Plug | 13020301-0716 | 6061 Aluminum | Black Anodized | Ø12.42 x 1.78 | FKM75 Brown Fluorine Rubber | 6.5 |
| 1/2-20 Plug | 13020302-1220 | 316 Stainless Steel | Original Stainless Steel Color | Ø14 x 1.78 | FKM75 Brown Fluorine Rubber | 9 |
| 5/8-18 Plug | 13020302-5818 | 316 Stainless Steel | Original Stainless Steel Color | Ø17.2 x 1.78 | FKM75 Brown Fluorine Rubber | 11 |
| 3/4-16 Plug | 13020302-3416 | 316 Stainless Steel | Original Stainless Steel Color | Ø21.95 x 1.78 | FKM75 Brown Fluorine Rubber | 12 |
| Square FCR1500 Plug | 13020302-1500 | 316 Stainless Steel | Original Stainless Steel Color | Ø19 x 2.5 + Ø13 x 1.5 | FKM75 Brown Fluorine Rubber | 16 |
| Square FCR2000 Plug | 13020302-2000 | 316 Stainless Steel | Original Stainless Steel Color | Ø22.22 x 2.62+Ø15.6 x 1.78 | FKM75 Brown Fluorine Rubber | 20 |
| Performance Characteristics | Bolt-type British Standard Plug | Square-type British Standard Plug |
|---|---|---|
| Maximum Rated Depth | 1000 meters / 3280 feet | 1000 meters / 3280 feet |
| Design Lifetime | up to 3 years or 500 cycles | up to 3 years or 500 cycles |
| Temperature Rating (air) | -25 ~ 60°C / -13 ~ 140°F | -25 ~ 60°C / -13 ~ 140°F |
| Temperature Rating (water) | -4 ~ 40°C / 32 ~ 104°F | -4 ~ 40°C / 32 ~ 104°F |
| *Internal Hex Socket | 6 (opposite sides) | - |
*Attention: The hex socket at the top can only be intended for quickly tightening or loosening, not suitable for applying high torque. An appropriate wrench should be used to finally tighten the opposite sides of the bulkhead in order to achieve the appropriate installation torque.
| Size | 7/16-20 Plug | 1/2-20 Plug | 5/8-18 Plug | 3/4-16 Plug | Square FCR1500 Plug | Square FCR2000 Plug |
|---|---|---|---|---|---|---|
| Thread Size/ Shaft Diameter (A) | 7/16-20UNF-2A | 1/2-20UNF-2A | 5/8-18UNF-2A | 3/4-16UNF-2A | 15.9（-0.016 -0.034） | 18.8（-0.02 -0.041） |
| Distance across Flats (B) | 3/4''（19.05） | 13/16''（20.64） | 1''（25.4） | 1-3/16''（30.16） | - | - |
| Assembled Height from Endcap (C) | 9 | 9 | 9 | 9 | 8.2 | 9.5 |
| Thread Length/ Shaft Length (D) | 20 | 20 | 20 | 20 | 12.7 | 12.7 |
| Overall Outer Diameter/ Width (E) | 21.6 | 23.4 | 28.8 | 34 | 38.1 | 44.4 |
| Wrench Socket Height (F) | 7.5 | 7.5 | 7.5 | 7.5 | - | - |
| Installation Location (G) | - | - | - | - | 35.92 | 44.9 |
Recommended Size:
| Size | 7/16-20 Plug | 1/2-20 Plug | 5/8-18 Plug | 3/4-16 Plug | Square FCR1500 Plug | Square FCR2000 Plug |
|---|---|---|---|---|---|---|
| Hole Size (A、d) | Ø0.445''（11.3±0.1） | Ø0.504''（12.8±0.1） | Ø0.629''（16±0.1） | Ø0.807（20.5±0.1） | Ø15.9（+0.027 0） | Ø18.8（+0.033 0） |
| Hatch Cover Thickness (B) | - | - | - | - | 13 | 13 |
| Surface Range (D) | 25 | 25 | 30 | 40 | 50 | 60 |
Nut and Washer Dimensions (approximate size)
| Size | 7/16-20 Plug | 1/2-20 Plug | 5/8-18 Plug | 3/4-16 Plug |
|---|---|---|---|---|
| Nut Height (A) | 6.5 | 8 | 9.5 | 10.5 |
| Maximum OD of Nut (B) | 20 | 21.5 | 27 | 32 |
| Nut across Flats (C) | 11/16'' | 3/4'' | 15/16'' | 1-1/8'' |
| Washer Outer Diameter (D) | 23.6 | 27 | 33.5 | 38 |
| Washer Inner Diameter (E) | 12 | 13.5 | 17 | 21 |
| Washer Thickness (F) | 1.4 | 2 | 2 | 3 |
