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  • Heli-Coil Standard Free Running Inserts Unified Coarse
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.

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

1185-01CN073 N/A {0} {QUOTE} N/A #1-64 N/A .073 in N/A .095 in N/A .103 in N/A .073 in N/A 2-3/4
1185-01CN110 N/A {0} {QUOTE} N/A #1-64 N/A .073 in N/A .095 in N/A .103 in N/A .110 in N/A 4-7/8
1185-01CN146 N/A {0} {QUOTE} N/A #1-64 N/A .073 in N/A .095 in N/A .103 in N/A .146 in N/A 6-7/8
1185-01CN182 N/A {0} {QUOTE} N/A #1-64 N/A .073 in N/A .095 in N/A .103 in N/A .182 in N/A 8-7/8
1185-01CN219 N/A {0} {QUOTE} N/A #1-64 N/A .073 in N/A .095 in N/A .103 in N/A .219 in N/A 10-7/8
1185-02CN086 N/A {0} {QUOTE} N/A #2-56 N/A .086 in N/A .110 in N/A .119 in N/A .086 in N/A 3
1185-02CN129 N/A {0} {QUOTE} N/A #2-56 N/A .086 in N/A .110 in N/A .119 in N/A .129 in N/A 5-1/4
1185-02CN172 N/A {0} {QUOTE} N/A #2-56 N/A .086 in N/A .110 in N/A .119 in N/A .172 in N/A 7-3/8
1185-02CN215 N/A {0} {QUOTE} N/A #2-56 N/A .086 in N/A .110 in N/A .119 in N/A .215 in N/A 9-5/8
1185-02CN258 N/A {0} {QUOTE} N/A #2-56 N/A .086 in N/A .110 in N/A .119 in N/A .258 in N/A 11-7/8
1185-03CN099 N/A {0} {QUOTE} N/A #3-48 N/A .099 in N/A .128 in N/A .139 in N/A .099 in N/A 2-7/8
1185-03CN148 N/A {0} {QUOTE} N/A #3-48 N/A .099 in N/A .128 in N/A .139 in N/A .148 in N/A 5
1185-03CN198 N/A {0} {QUOTE} N/A #3-48 N/A .099 in N/A .128 in N/A .139 in N/A .198 in N/A 7-1/4
1185-03CN248 N/A {0} {QUOTE} N/A #3-48 N/A .099 in N/A .128 in N/A .139 in N/A .248 in N/A 9-3/8
1185-03CN297 N/A {0} {QUOTE} N/A #3-48 N/A .099 in N/A .128 in N/A .139 in N/A .297 in N/A 11-1/2
1185-04CN112 N/A {0} {QUOTE} N/A #4-40 N/A .112 in N/A .144 in N/A .159 in N/A .112 in N/A 2-3/4
1185-04CN168 N/A {0} {QUOTE} N/A #4-40 N/A .112 in N/A .144 in N/A .159 in N/A .168 in N/A 4-3/4
1185-04CN224 N/A {0} {QUOTE} N/A #4-40 N/A .112 in N/A .144 in N/A .159 in N/A .224 in N/A 6-3/4
1185-04CN280 N/A {0} {QUOTE} N/A #4-40 N/A .112 in N/A .144 in N/A .159 in N/A .280 in N/A 8-7/8
1185-04CN336 N/A {0} {QUOTE} N/A #4-40 N/A .112 in N/A .144 in N/A .159 in N/A .336 in N/A 10-7/8
1185-05CN125 N/A {0} {QUOTE} N/A #5-40 N/A .125 in N/A .158 in N/A .173 in N/A .125 in N/A 3-1/4
1185-05CN188 N/A {0} {QUOTE} N/A #5-40 N/A .125 in N/A .158 in N/A .173 in N/A .188 in N/A 5-1/2
1185-05CN250 N/A {0} {QUOTE} N/A #5-40 N/A .125 in N/A .158 in N/A .173 in N/A .250 in N/A 7-3/4
1185-05CN312 N/A {0} {QUOTE} N/A #5-40 N/A .125 in N/A .158 in N/A .173 in N/A .312 in N/A 10
1185-05CN375 N/A {0} {QUOTE} N/A #5-40 N/A .125 in N/A .158 in N/A .173 in N/A .375 in N/A 12-1/4
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