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Product Specifications:
| Item | Lock Nut |
| Finish | Black Oxide |
| Hex Height | 3/64" |
| Hex Type | Thin Heavy Hex |
| Hex Width | 1/2" |
| Lock Type | Flexible Top |
| Material | Steel |
| Material Grade/class | Grade 2 |
| Max. Temp. | 1200°F |
| Min. Temp. | -70°F |
| Nut Height | 7/32" |
| Nut Type | Flexible Top |
| Nut Type | Top Lock Jam Nut |
| Removable | Yes |
| Resistance Properties | Impact Resistant, Shock And Vibration Resistant |
| System Of Measurement | Imperial |
| Thread Direction | Right Hand |
| Thread Fit | 2B |
| Thread Size | 1/4"-20 |
| Type | Top Lock Jam |
Shipping Info:
| Ship weight (kg) | 0.45 |
| Ship height (cm) | 2.66 |
| Ship length (cm) | 3.81 |
| Ship width (cm) | 3.81 |
| Country of Origin | US |
Product Variants
| Product | Model | Thread Size | Hex Width | Hex Height | Nut Height | Hex Type | Max. Temp. | Resistance Properties | Pkg. Qty. | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
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20FK-518 | 5/16"-18 | 9/16" | - | 17/64" | - | - | - | 100 | €223.97 | |
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20FK-616 | 3/8"-16 | 5/8" | 5/64" | 0.282" | Thin Heavy Hex | 1200°F | Impact Resistant, Shock And Vibration Resistant | 100 | €177.21 | |
![]() |
20FK-714 | 7/16"-14 | 3/4" | - | 0.328" | - | - | - | 100 | €183.86 | |
![]() |
20FK-813 | 1/2"-13 | 13/16" | 3/32" | 0.328" | Thin Heavy Hex | 1200°F | Impact Resistant, Shock And Vibration Resistant | 100 | €302.12 | |
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30FK-1011 | 5/8"-11 | 1" | 7/64" | 0.399" | Thin Heavy Hex | 1200°F | Impact Resistant, Shock And Vibration Resistant | 50 | €203.60 | |
![]() |
30FK-1409 | 7/8"-9 | 1 5/16" | 5/32" | 0.477" | Thin Heavy Hex | 1200°F | Impact Resistant, Shock And Vibration Resistant | 20 | €228.13 |
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FLEXLOC 20FKC-420 Locknut, 1/4 In - 20 Thread Size, Flexible Top, 1/2 In Hex Wd., Top Lock Jam, Gr. 2, Steel
€91.21 /pack






