Standard

Ti,steel composite tube sheet,Commercially Pure (CP) titanium seamless tubing,titanium tubing for chemical industry

AMS 2249-General dimensional tolerances for titanium mill products

Tolerances for Titanium and Titanium Alloy Forgings

AMS 2249 is a SAE Aerospace Material Specification that defines dimensional tolerances, straightness, flatness, and machining allowances for titanium and titanium alloy forgings. It applies to closed-die, open-die, and ring forgings used in aerospace and other high-performance industries.

This standard ensures uniformity and interchangeability across forgings supplied by various manufacturers.


What AMS 2249 Covers

AMS 2249 defines tolerances for:

Feature

Description

Dimensional Tolerances

Max deviations on thickness, width, length, OD, ID

Straightness

Permissible bow or deviation over a length (typically per mm or inch)

Flatness

Tolerances for flat areas of parts

Machining Allowance

Minimum stock left for machining after forging

Flash Tolerances

Limits for flash width and thickness

Parting Line Displacement

Allowable misalignment at the die parting line

Draft Angles

Minimum draft required for forging removal from dies

Weight Tolerances

Acceptable weight variation on finished forgings

These tolerances vary depending on part size, forging method, and whether the forging is rough, finish-machined, or net-shape.


Applicability

Category

Detail

Material Types

Pure titanium and titanium alloys (e.g., Ti-6Al-4V, CP grades)

Forging Types

Open-die, closed-die, seamless rings

Product Forms

Aircraft components, engine parts, structural forgings


Examples of Typical Tolerances (Illustrative Only)

Feature

Size Range

Tolerance (Typical)

Thickness

25–50 mm (1–2 in)

±0.8 mm (±0.031 in)

OD (ring forgings)

100–300 mm

±1.0 mm to ±2.0 mm

Straightness

L/1000 or 0.5 mm max

Varies by shape and size

Flash (height)

Typically ≤ 3 mm

Dependent on die configuration

Machining Allowance

1.5–3 mm (min)

Depends on part geometry

Note: Always refer to the current AMS 2249 document for exact tolerance tables.


Related Specifications

AMS 4928        Ti-6Al-4V forgings and bar

AMS 4921        CP Titanium forgings

AMS 4925        Ti-6Al-4V ELI bar and forgings

AMS 2241        General tolerances for titanium bars/wire/plate

ASTM B381     Titanium forgings for general industrial use