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MS14181 — Tension Bolt, Nickel Alloy 718, Shear

MS14181 covers high-strength tension bolts machined from Nickel Alloy 718 (Inconel 718), rated to 220 KSI Ftu, with an external wrenching spline drive and flanged head. Revision B was issued September 21, 1987, and the series is widely used as a precision shear bolt in high-temperature, high-load joints.

Type: Shear Bolt, Spline Drive Material: Nickel Alloy 718 Tensile: 220 KSI Ftu Revision: B, 21 Sep 1987 FSC Class: 5306

At a Glance

Full Title
Bolt, Tension, Nickel Alloy 718, 220 KSI Ftu
Drive Style
External Wrenching Spline, Flanged Head
Material Spec
AMS 5662 or AMS 5663
Thread
UNJF, Class 3A, Right-Hand
Finish Options
Cadmium (QQ-P-416) or Dry Film (MIL-L-46010)
Head Style
Spline Extended Washer
Custodians
Army, Navy, Air Force
FSC Class
5306

Overview

MS14181 covers a family of tension bolts machined from Nickel Alloy 718 (a nickel-chromium superalloy also known as Inconel 718), qualified to AMS 5662 or AMS 5663 and rated to a minimum tensile strength of 220 KSI. The bolt uses an external wrenching spline drive with a flanged, "spline extended washer" head, and is commonly supplied as an undrilled-head shear bolt.

Threads follow the UNJF fine-thread series with a controlled root radius, Class 3A fit, right-hand. Two finish options are commonly specified: cadmium plate per QQ-P-416 Type II Class 2, or a Type I dry film lubricant per MIL-L-46010 over a nickel-passivated base. Dash numbers in the part number encode diameter and grip length per the standard's dimensional table.

  • The high tensile strength and elevated-temperature capability of Nickel Alloy 718 make MS14181 bolts suited to jet engine, exhaust, and other high-heat structural joints.
  • Suffix letters distinguish drilled vs. undrilled head and shank configurations — always confirm the exact suffix meaning against the current drawing sheet before substituting.

Part Number Reference

Dash numbers encode diameter and grip length; suffix letters modify drilling and finish.

MS14181-06018L
MS14181-06018L decodes to: 3/8-24 thread, grip 1.125", undrilled head and shank, Nickel Alloy 718.

Material & Finish Callouts

RequirementGoverning Document
Base MaterialNickel Alloy 718 per AMS 5662 or AMS 5663
Cadmium FinishQQ-P-416, Type II, Class 2
Dry Film FinishMIL-L-46010, Type I, over nickel passivate
Thread FitUNJF, Class 3A, Right-Hand
Minimum Tensile Strength220 KSI Ftu

MS14181 — Frequently Asked Questions

What is Nickel Alloy 718?

It's a nickel-chromium-based superalloy (commercially known as Inconel 718) prized for high tensile strength and stable mechanical properties at elevated temperatures — well suited to the high-heat, high-load environments MS14181 bolts are used in.

What does the "spline extended washer" head style mean?

It's an external wrenching spline drive combined with an integral flange (extended washer) under the head, giving a broader bearing surface than a standard hex head without needing a separate washer.

What's the difference between drilled and undrilled MS14181 bolts?

Drilled versions have a hole through the head and/or shank for safety wiring; undrilled versions (commonly suffixed "L") omit this feature. The correct configuration depends on the locking method specified on the assembly drawing.

Need MS14181 Nickel Alloy Bolts?

Ananka Fasteners manufactures MS14181 tension bolts with full material traceability and Mill Test Certification on every lot.

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