MIL-DTL-15021B
2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict
between the text of this document and the references cited herein, the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a
specific exemption has been obtained.
3. REQUIREMENTS
3.1 Material.
3.1.1 Snap hooks and rings. Snap hooks and rings shall be made of brass.
3.1.2 Snap hook spring. Snap hook springs shall be made of corrosion resistant material.
3.2 Type I Regular.
3.2.1 Snap Hooks. Regular snap hooks shall be of the size and shape shown on Figure 1. They
shall be operated by forcing back the bolt-snap against a substantial spring and releasing it to close over
the ring.
3.2.2 Swivel eye. Snap hooks shall have a nominal 0.750 inch round swivel eye, conforming in
size and shape to the dimensions shown on Figure 1. The greatest width of the swivel eye shall be at
the point shown on Figure 1.
3.2.3 Rings. Unless otherwise specified, regular snap hooks shall be provided with a seamless
ring, round in cross section and of the dimensions shown on Figure 2.
3.2.4 Tolerances.
3.2.4.1 Snap hooks. A tolerance of plus or minus 0.063 inch will be permitted in the length of the
hooks. On all other dimensions except the swivel eye a tolerance of plus or minus 5 percent will be
permitted.
3.2.4.2 Swivel eye. The dimensions of the swivel eye shown on Figure 1 shall not be exceeded by
more than 0.031 inch.
3.3 Type II Quick-acting.
3.3.1 Snap Hooks. Quick-acting snap hooks shall be of the size and shape shown on Figure 3. The
snap hook shall be provided with a bolt snap and substantial spring. The jaws shall be of the proper
contour and finish to permit easy engagement with the ring.
3.3.2 Swivel eye. Snap hooks shall have a nominal 0.750 inch round swivel eye, conforming in size
and shape to the dimensions shown on Figure 3. The greatest width of the swivel eye shall be at the
point shown on Figure 3.
3.3.3 Rings. The rings shall be as specified in 3.2.3.
3.3.4 Tolerances.
3.3.4.1 Snap hooks. The tolerances for quick-acting snap hooks shall be as specified in 3.2.4.1.
3.3.4.2 Swivel eye. The dimensions of the swivel eye shown on Figure 3 shall not be exceeded by
more than 0.031 inch.
3.4 Workmanship. Snap hooks and rings shall be of good workmanship and free from defects and
flaws which may affect the appearance or serviceability.
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