Specifications for Compression Springs
In ordering give the following information as completely as possible:

• Free Length, Maximum, Minimum
• Controlling Diameter, Outside Diameter Maximum. Inside Diameter Minimum. Pitch Diameter. Works Inside (Dia. Hole). Works Over (Dia. Shaft).
• Number of Coils.
• Wire Size. Decimal size if possible.
• Material, Kind and Grade.
• Loads at deflected positions.
• Style of Ends, (See
• Illustration).
• Right or Left Hand Wound.
• Finish, Plain unless otherwise specified.
• Maximum Solid Length.
• Frequency of Compression.
  

Specifications for Torsion Springs
In ordering give the following information as completely as possible:

• Inside or Outside Diameter.
• If spring works on a rod, give size of same, as spring must not bind when wound up to its limit of travel.
• Free Length and number of coils. If spring cannot increase in length as wound up, allow sufficient space between coils.
• Right or Left Hand Wound.
• Wire Size. Decimal size if possible.
• Material, Kind and Grade.
• Style of Ends, (See Illustration).
• Number of turns deflection to hold given load and radius of loaded arm. This length may be the length of the arm, or the arm may be attached to a movable machine member, in which case the length to point of appplication of load is given.
• Finish, Plain unless otherwise specified.

Specifications for Extension Springs
In ordering give the following information as completely as possible:

• Length, Maximum, Minimum (Over all, Over coil, Inside Hooks).
• Controlling Diameter: Outside Diameter Maximum. Inside Diameter Minimum.
• Wire Size. Decimal size if possible.
• Material, Kind and Grade.
• Number of Coils.
• Style of Ends, (See Illustration).
• Right or Left Hand Wound.
• Finish, Plain unless otherwise specified.
• Load Required, Length Inside Hooks (Length of Coil if wire size not specified).
• Maximum Extended Length (Over all, Over coil, Inside Hooks).
• Deflection or Distance of Travel.
• Frequency of Extension.
• Is Position of Ends important? (making the ends of springs bear a definite relation to each other usually adds to the cost of manufacture.)