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Heli-Coil inserts are precision formed coils of extremely hard, diamond shaped 304 stainless steel. When installed into an STI tapped hole, they provide permanent conventional 60° internal screw threads. This assembled insert accommodates any standard bolt or screw as per MIL-S-7742 and AS8879 (UNJ controlled root radius).
Heli-Coil inserts are larger in diameter before installation than the tapped hole. During installation the inserting tool applies torque to the tang reducing the diameter of the leading coil permitting it to enter the tapped thread. After installation, each high tensile coil of the insert expands outward with a spring-like action permanently anchoring the insert.
All Heli-Coil Inch Screw-Lock inserts are supplied with a red coloring in accordance with NASM21209.

Notes on Insert Specifications:
1. Nominal Length is a computed value and cannot be measured. It is the actual assembled length + 1/2 pitch.
2. The number of coils are counted 90° from the tang.
3. Grip Coil(s| Location for 1,1-1/2 and 2 diameter long inserts, Grip Coil Location = 1/2 the number of free coils. For 2-1/2 and 3 diameter long inserts. Grip Coil Location (distance from the tang) is the same as 2 diameter long inserts.
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MFG #

Inventory

List Price

Thread Size

Thread Size Inch

Outside Diamater Min.

Outside Diamater Max.

Q - Nominal Length

Number of Coils

3591-02CN086 N/A {0} {QUOTE} N/A #2-64 N/A .086 in N/A .110 in N/A .119 in N/A .086 in N/A 3-1/2
3591-02CN129 N/A {0} {QUOTE} N/A #2-64 N/A .086 in N/A .110 in N/A .119 in N/A .129 in N/A 5-7/8
3591-02CN172 N/A {0} {QUOTE} N/A #2-64 N/A .086 in N/A .110 in N/A .119 in N/A .172 in N/A 8-3/8
3591-02CN215 N/A {0} {QUOTE} N/A #2-64 N/A .086 in N/A .110 in N/A .119 in N/A .215 in N/A 10-3/4
3591-02CN258 N/A {0} {QUOTE} N/A #2-64 N/A .086 in N/A .110 in N/A .119 in N/A .258 in N/A 13-1/8
3591-03CN099 N/A {0} {QUOTE} N/A #3-56 N/A .099 in N/A .131 in N/A .146 in N/A .099 in N/A 3-3/8
3591-03CN148 N/A {0} {QUOTE} N/A #3-56 N/A .099 in N/A .131 in N/A .146 in N/A .148 in N/A 5-5/8
3591-03CN198 N/A {0} {QUOTE} N/A #3-56 N/A .099 in N/A .131 in N/A .146 in N/A .198 in N/A 8
3591-03CN248 N/A {0} {QUOTE} N/A #3-56 N/A .099 in N/A .131 in N/A .146 in N/A .248 in N/A 10-3/8
3591-03CN297 N/A {0} {QUOTE} N/A #3-56 N/A .099 in N/A .131 in N/A .146 in N/A .297 in N/A 12-5/8
3591-04CN112 N/A {0} {QUOTE} N/A #4-48 N/A .112 in N/A .147 in N/A .162 in N/A .112 in N/A 3-3/8
3591-04CN168 N/A {0} {QUOTE} N/A #4-48 N/A .112 in N/A .147 in N/A .162 in N/A .168 in N/A 5-5/8
3591-04CN224 N/A {0} {QUOTE} N/A #4-48 N/A .112 in N/A .147 in N/A .162 in N/A .224 in N/A 7-7/8
3591-04CN280 N/A {0} {QUOTE} N/A #4-48 N/A .112 in N/A .147 in N/A .162 in N/A .280 in N/A 10-1/4
3591-04CN336 N/A {0} {QUOTE} N/A #4-48 N/A .112 in N/A .147 in N/A .162 in N/A .336 in N/A 12-1/2
3591-06CN138 N/A {0} {QUOTE} N/A #6-40 N/A .138 in N/A .173 in N/A .193 in N/A .138 in N/A 3-1/2
3591-06CN207 N/A {0} {QUOTE} N/A #6-40 N/A .138 in N/A .173 in N/A .193 in N/A .207 in N/A 6
3591-06CN276 N/A {0} {QUOTE} N/A #6-40 N/A .138 in N/A .173 in N/A .193 in N/A .276 in N/A 8-3/8
3591-06CN345 N/A {0} {QUOTE} N/A #6-40 N/A .138 in N/A .173 in N/A .193 in N/A .345 in N/A 10-3/4
3591-06CN414 N/A {0} {QUOTE} N/A #6-40 N/A .138 in N/A .173 in N/A .193 in N/A .414 in N/A 13-1/4
3591-2CN164 N/A {0} {QUOTE} N/A #8-36 N/A .164 in N/A .204 in N/A .224 in N/A .164 in N/A 3-7/8
3591-2CN246 N/A {0} {QUOTE} N/A #8-36 N/A .164 in N/A .204 in N/A .224 in N/A .246 in N/A 6-1/2
3591-2CN328 N/A {0} {QUOTE} N/A #8-36 N/A .164 in N/A .204 in N/A .224 in N/A .328 in N/A 9-1/8
3591-2CN410 N/A {0} {QUOTE} N/A #8-36 N/A .164 in N/A .204 in N/A .224 in N/A .410 in N/A 11-5/8
3591-2CN492 N/A {0} {QUOTE} N/A #8-36 N/A .164 in N/A .204 in N/A .224 in N/A .492 in N/A 14-1/4
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