Preliminary Requirements

Safety Requirements

CAUTION

DO NOT USE PARALLEL-SIDED, SHARP-EDGED OR SHARP POINTED TOOLS FOR STAKING.

Procedure

1. SUBTASK 70-42-06-400-001 Staking of Nonthreaded Parts

   1. Refer to Figure.

   2. The number of staking dents necessary are:

      1. For components which are less than 0.126 in. (3.2 mm) in diameter, there must be at least one staking dent.

      2. For components which are more than 0.126 in. (3.2 mm) in diameter, there must be at least two staking dents.

   3. The location of the staking dent (Figure INSET 1).

      1. All staking dents must be in 0.030 in. (0.76 mm) or less of correct position.

      2. For holes which are less than 0.375 in. (9.52 mm) in diameter, the staking dent must be on a diameter 0.060 in. (1.5 mm) larger than the hole diameter.

      3. For holes which are 0.375 in. (9.52 mm) and above, the staking dent must be on a diameter 0.100 in. (2.50 mm.) larger than the hole diameter.

      4. Staking dents must be equally spaced around the edge of the hole if the wall thickness is a minimum of 0.090 in. (2.29 mm).

      5. If the wall thickness is less than 0.090 in. (2.29 mm) in some areas, the staking must be done only in the areas larger than 0.090 in. (2.29 mm). The maximum space between staking must be kept. No staking is permitted in areas where the wall thickness is less than 0.090 in. (2.29 mm).

   4. NOTE

      The type of staking dent used is optional, but the side walls of dents must be tapered and have rounded corners (Figure INSET 4).

      The shape of the staking dents.

      1. Line staking (Figure INSET 2).

         1. When this procedure of staking is necessary, the length of the dents must be specified in the repair illustration.

      2. Ring staking (Figure INSERT 3).

         1. When this procedure of staking is necessary, the dent must be fully around the hole.

   5. The dimensions and depth of staking dents.

      1. The dimensions and depth necessary for staking dents to sufficiently keep the installed parts in position is given in operation E. and in the limits given in paragraph 2. (Quality Requirements).

   6. The safety of parts.

      1. Parts are sufficiently held, after staking if:

         1. The housing material is moved over the installed part.

         2. The hole diameter at each staking position is at least 0.003 in. (0.076 mm) less than the outside diameter of the part held. (Figure INSET 4).

2. SUBTASK 70-42-06-400-002 Staking of Headless Threaded Plugs

   1. Refer to Figure.

   2. The number of staking dents necessary.

      1. For headless threaded plugs, there must be at least two staking dents.

   3. The location of the staking dent.

      1. Staking dents must be in to the threads and be equally divided to the nearest 15 degrees.

   4. The shape of staking dents.

      1. Staking dents must be circular in shape with rounded bottoms.

   5. The dimensions and depth of staking dents.

      1. The dimensions and depth necessary for staking dents to sufficiently keep the installed parts in position is given in operation E. and in the limits given in paragraph 2. (Quality Requirements).

   6. Safety test.

      1. All staked plugs must be resistant to a loosen torque of ten pound-inches minimum, to be sufficiently held.

3. SUBTASK 70-42-06-400-003 Staking of Flat Head Screws

   1. Refer to Figure.

   2. The number of staking dents necessary.

      1. For flat head screws, there must be at least two staking dents.

   3. The location of the staking dents.

      1. The staking dents must be on the edge of the screw head and equally divided to the nearest 15 degrees. The material moved by the staking dent must be over the edge of the screw head.

      2. Screws with slots or notches must have the staking dent positioned at the slot or notch. This will move the metal in to the slot or notch.

   4. The shape of staking dents.

      1. The shape of staking dents used is optional, but the side walls of dents must be tapered and have rounded corners.

   5. The dimensions and depth of staking dents.

      1. The dimensions and depth necessary for staking dents to sufficiently keep the installed parts in position is given in operation E. and in the limits given in paragraph 2. (Quality Requirements).

   6. The safety of parts.

      1. Screws without slots or notches are sufficiently held when a minimum of 0.003 in. (0.076 mm) of moved material is above the edge of the screw head at each staking position.

      2. Screws with slots or notches are sufficiently held when a minimum of 0.003 in. (0.076 mm) of moved material goes in to the slot or notch at each staking position.

4. SUBTASK 70-42-06-400-004 Groove Staking

   1. Refer to Figure.

   2. Use the correct tool to push the lip of the grooved component over the chamfered component. Make sure that the material moved is equal around the groove. (Figure INSET 2).

   3. A 0.005 in. (0.13 mm) maximum clearance is permitted between the lip and the chamfer. This clearance can be more than 0.005 in. (0.13 mm) for a maximum of 90 degrees around the chamfer. If the clearance is more, it can be accepted but it must agree with the proof loads given in C. Axial change because of proof load is not permitted.

   4. Proof loads when used are the value given in Figure INSET 1, multiplied by the outside diameter of the component that is held.

   5. The moved material on the lip must be free from cracks and gouges.

   6. Tool marks and gouges caused by the staking tool in the groove opposite the moved lip is cause for reject.

Figure: Staking of non-threaded parts

Staking of non-threaded parts



Figure: Staking of headless threaded parts

Staking of headless threaded parts



Figure: Staking of flat headless screws

Staking of flat headless screws



Figure: Groove staking

Groove staking