121

121

Regular extension spring in Hand Drawn Steel. This spring features an O.D. of 0.437 Inch, an initial tension of 8 Pound, and a spring rate of 7.3 Pound Force per Inch.

Current variant: 121CS. Navigate to a different variant:
Diagram of extension spring with measurements
Unit System
Specs (in standard)
Label Value
Brand Century Spring
Display Name 121
Ends Machine Hook
Finish Zinc
Initial Tension 8 lb
Length 8.5 in
Material Hand Drawn Steel
Outside Diameter 0.437 in
Part Type Standard
Rate 7.3 lbf/in
Sugg Max Deflection 2.9 in
Sugg Max Load 29 lbf
Wind Direction Left
Wire Diameter 0.072 in
Specs (in metric)
Label Value
Brand Century Spring
Display Name 121
Ends Machine Hook
Finish Zinc
Initial Tension 3.63 kg
Length 215.9 mm
Material Hand Drawn Steel
Outside Diameter 11.1 mm
Part Type Standard
Rate 1.28 N/mm
Sugg Max Deflection 73.66 mm
Sugg Max Load 128.99 N
Wind Direction Left
Wire Diameter 1.83 mm

Inventory Status

In-stock

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Quantity Price
1 - 49 $6.23
50 - 149 $5.92
150 - 299 $5.61
300 - 499 $5.30
500 - 749 $4.68
750 - 999 $4.05
1000+ Call for price