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Chicago SRW Wheat Futures Contract Specs

Contract Unit 5,000 bushels (~ 136 Metric Tons)
Price Quotation U.S. cents per bushel
Trading Hours Sunday – Friday: 7:00 p.m. – 7:45 a.m. CT and
Monday – Friday: 8:30 a.m. – 1:20 p.m. CT
Minimum Price Fluctuation 1/4 of one cent per bushel = $12.50
Product Code CME Globex: ZW
CME ClearPort: W
Clearing: W
Listed Contracts 15 monthly contracts listed in the Mar, May, Jul, Sep, Dec cycle. List monthly contracts for a new Sep, Dec, Mar, May, Jul cycle following the termination of trading in the Jul contract of the current year. 
Settlement Method Deliverable
Termination Of Trading Trading terminates on the business day prior to the 15th calendar day of the contract month.
Trade At Marker Or Trade At Settlement Rules Trading at settlement is available (for calendar months MAR and MAY) for the  first 4 listed futures contracts and calendar spreads.For all other months TAS is available for 5 active months and calendar spreads and are subject to the existing TAS rules. The Last Trade Date for CBOT Grain and Oilseed TAS products will be the First Position Day (FPD) of the front-month contract (FPD is the second to last business day in the month prior to the nearby contract month).

Trading in all CBOT Grain TAS products will be 19:00-07:45 and 08:30-13:15 Chicago time. All resting TAS orders at 07:45 will remain in the book for the 08:30 opening, unless cancelled.

TAS products will trade a total of four ticks above and below the settlement price in ticks of the corresponding futures contract (0.0025), off of a "Base Price" of 0 to create a differential (plus or minus 4 ticks) versus settlement in the underlying product on a 1 to 1 basis. A trade done at the Base Price of 0 will correspond to a "traditional" TAS trade which will clear exactly at the final settlement price of the day.
Settlement Procedures Wheat Settlement Procedures
Position Limits CBOT Position Limits
Exchange Rulebook CBOT 14
Block Minimum Block Minimum Thresholds
Price Limit Or Circuit Price Limits
Vendor Codes Quote Vendor Symbols Listing
Last Delivery Date Second business day following the last trading day of the delivery month.
Grade And Quality #2 Soft Red Winter at contract price, #1 Soft Red Winter at a 3 cent premium, other deliverable grades listed in Rule 14104.