Peerless Industrial Group
Peerless Industrial Group Tire Chains Single Bus & RV V-Bar PK2 QG2821
$67.99
0.00081872BTC
In stock
Unique-Bargains
Unique-Bargains M4 x 20mm 12.9 Alloy Steel Hex Socket Head Cap Screws Black 30pcs
M4 x 20 mm grade 12.9 alloy steel socket head cap screws, 30 pieces for industrial and general fastening
- High-strength fastening with 12.9 grade alloy steel
- Precise M4 x 20mm threads for secure assembly
- 30-piece pack covers multiple installation needs
- Lightweight 76g total weight simplifies handling
- Black finish resists corrosion in varied environments
M4 x 20 mm alloy steel cap screws
These hex socket head cap screws use 12.9 alloy steel for high tensile strength in fastening tasks. The M4 thread with 0.7 mm pitch and 20 mm length suits precision assemblies. Supplied as a pack of 30 pieces for workshop or production use.
Black oxide finish resists corrosion
The black coating provides a protective layer against moisture and oxidation during normal handling. Alloy steel construction maintains clamping force under vibration without excessive weight at 76 g per pack. No special tools required beyond a standard hex driver.
Hex socket allows flush installation
The internal hex drive enables tightening in recessed holes where external heads would interfere. Uniform 0.16 inch diameter and 0.8 inch length ensure consistent fit across all 30 screws. Suitable for machinery, appliances and structural fixtures where reliable retention matters.
Highlights
- High-strength fastening with 12.9 grade alloy steel
- Precise M4 x 20mm threads for secure assembly
- 30-piece pack covers multiple installation needs
- Lightweight 76g total weight simplifies handling
- Black finish resists corrosion in varied environments
Specifications
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Questions about this item
How do I install the M4 x 20mm hex socket cap screws and what step is often missed?
Use a 3 mm hex key to drive the socket head; the step often missed is checking that the 0.7 mm thread pitch matches the tapped hole before applying torque.
What maintenance or replacement will these 12.9 alloy steel screws need later?
Inspect the black finish for corrosion and re-torque to the original preload after vibration cycles; replace any screw showing thread damage or stretch.
What limit appears first when the 30-piece set sees sustained clamping load?
The 12.9 grade alloy steel reaches its yield point before the threads strip, so joint relaxation or permanent stretch is the first limit under sustained load.
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