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Proof load: 250 lb
Identification: RW-3
Common use: 3-ring release systems
Comment: Upper riser ring.
Figure 3-69. Ring, riser, mini, 3-ring.
Specification: Commercial
Proof load: 250 lb
Identification: RW-4
Common use: 3-ring release systems
Comment: Small ring of mini 3-ring systems,
riser guide rings.
3-20
Figure 3-70. Ring, harness, tandem.
Specification: Commercial
Proof load: 5000 lb
Identification: N/A
Common use: Tandem harness assemblies
Comment: Manufactured by Parachutes de France
and Strong Enterprises.
Figure 3-71. Ring, harness, replaceable, 3-ring.
Specification: Commercial
Proof load: 2500 lb
Identification: RW-6
Common use: Replaceable 3-ring harness ring
Comment: Replaces soft RW-1/82 and 83 harness
rings.
Figure 3-72. Ring, harness, “O”.
Specification: Commercial
Proof load: 2500 lb
Identification: 5010
Common use: Articulated harness ring, tandem
drogue release
Comment: N/A
Figure 3-73. Ring, harness, mini.
Specification: Commercial
Proof load: 2500 lb
Identification: 444, RW-8
Common use: 3-ring harness ring
Comment: Sport harnesses.
3-21
Figure 3-74. Ring, quick fit.
Specification: Commercial
Proof load: 2500 lb
Identification: 555, RI-1
Common use: Sport student harness, pilot emergency
harness
Comment: N/A
Figure 3-75. Snap shackle.
Specification: Commercial
Proof load: A. Bronze, 800 lb; B. Stainless steel,
1765 lb
Identification: As marked
Common use: RSL lanyard release
Comment: Made in bronze and stainless steel.
Figure 3-76. Snap, static line, old style.
Specification: MS-70120
Proof load: 1750 lb
Identification: As marked
Common use: Military and sport static lines
Comment: N/A
Figure 3-77. Snap, static line, new style.
Specification: 11-1-6991-1
Proof load: 1750 lb
Identification: As marked
Common use: Military static lines
Comment: N/A
3-22
Figure 3-78. Soft link.
Specification: N/A
Strength: N/A
Identification: As marked
Common use: Replacement for Rapide® links on
main and reserve canopies
Comment: N/A
PLASTICS AND SYNTHETICS
The term “plastic” used here is a generic term for synthetic
materials. The use of these materials is primarily
for stiffeners in containers. They replace the metal stiffeners
used in military systems. High density polyethylene
(HDPE) was the first material used followed by Lexan®.
Time has proven that moly disulfide (MDS) filled nylon
is superior to the other materials and has become the most
commonly used stiffener material. Today, the use of
Lexan® is primarily in clear windows in pin protector
flaps. [Figures 3-79 through 3-83]
Figure 3-79. Molydisulfide Nylon — MDS
(Nylatron®).
Specification: Commercial
Strength: N/A
Identification: .025", .040", .060"
Common use: Stiffeners in container systems
Comment: The preferred material in modern container
systems.
Figure 3-80. Poylethylene, high density (HDPE).
Specification: Commercial
Strength: N/A
Identification: .040", .060"
Common use: Stiffeners in container systems
Comment: Used in older systems. Deforms
easily.
Figure 3-81. HDPE tubing, 1 1/2".
Specification: Commercial
Strength: N/A
Identification: Orange color
Common use: Hand deploy handles, pinless student
ripcords
Comment: N/A
3-23
Figure 3-82. Polycarbonate — Lexan®.
Specification: Commercial
Strength: N/A
Identification: .030", .060"
Common use: Windows in container systems, stiffeners
in older systems
Comment: Breaks easily.
Figure 3-83. Vinyl.
Specification: Commercial
Strength: N/A
Identification: N/A
Common use: Transparent windows for CYPRES®
control units
Comment: N/A
FASTENERS
Fasteners are various types of devices designed to hold
parts or components together or allow them to be held
open or closed. The most common designs are hook and
loop fasteners (Velcro®), snaps, grommets, and slide
fasteners (zippers).
Of all these, Velcro® and grommets play a major part in
parachute manufacture. The use of Velcro® is primarily
for protector flap closure designs, while grommets are for
use in pack closing systems. Both fasteners are subject to
extreme wear and tear in their normal use. Consequently,
routine maintenance involves the repair and replacement
　
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