Hard Drawn Extension Spring - P/N 311

Part Number 311
Outside Diameter (in.) 0.375
Inside Diameter (in.) 0.305
Overall Length (in.) 2.500
Wire Diameter (in.) 0.035
Rate (lbs./in.) 1.12
Load (lbs.) 2.82
Deflection at Load (in.) 1.94
Initial Tension (lbs.) 0.65
End Style LOOP
End Type CROSSOVER
Material HARD DRAWN
Finish ZINC
6 Piece Minimum Order Quantity
1-49 piece price $2.40
50-99 piece price $1.41
100-249 piece price $1.08
250-499 piece price $0.86
500-999 piece price $0.71
1000-1999 piece price $0.59
2000 or more CALL OR EMAIL
$35 minimum TOTAL purchase order.
diagram of extension spring

This extension spring made of hard drawn with an outside diameter of 0.375 inches and an overall length of 2.500 inches was manufactured in America by a family-owned spring manufacturing company.

Our extensive line of stock and custom compression springs, extension springs, and torsion springs ship in days and can meet any application.

If you’re struggling to identify the spring you need, check out our How to Measure Compression Springs, How to Measure Extension Springs or How to Measure Torsion Springs instructions or contact our custom spring manufacturing experts today.

These prices are for immediate acceptance and may be affected by conditions beyond our control. All goods are FOB our plant in Wilder, Kentucky. Our terms are net 30 days. We do not assume any responsibility for plating since this is not done in our plant. Block tolerances on prints do not apply as all tolerances are to Spring Manufacturers Institute specifications. The quantities for custom made springs can vary +/- 10%.

A $10 shipping/handling fee will be added to any drop shipments. All orders shipping with a carrier other than UPS will have an additional $10.00 handling fee. This handling fee does not apply to Truck shipments.