N.J. Ct. R. 4:22
Rule 4:22-1. Request for Admission
A party may serve upon any other party a written request for the admission, for purposes of the pending action only, of the truth of any matters of fact or opinion within the scope of R. 4:10-2 set forth in the request, including the genuineness of any documents described in the request. Copies of documents shall be served with the request unless they have been or are otherwise furnished or made available for inspection and copying. The request may, without leave of court, be served upon the plaintiff after commencement of the action and upon any other party with or after service of the summons and complaint upon that party.
Each matter of which an admission is requested shall be separately set forth. The matter is admitted unless, within 30 days after service of the request, or within such shorter or longer time as the court may allow, the party to whom the request is directed serves upon the party requesting the admission a written answer or objection addressed to the matter, signed by the party or by the party's attorney, but, unless the court shortens the time, a defendant shall not be required to serve answers or objections before the expiration of 45 days after being served with the summons and complaint. If objection is made, the reasons therefor shall be stated. The answer shall specifically deny the matter or set forth in detail the reasons why the answering party cannot truthfully admit or deny the matter. A denial shall fairly meet the substance of the requested admission, and when good faith requires that a party qualify the answer or deny only a part of the matter of which an admission is requested, the party shall specify so much of it as is true and qualify or deny the remainder. An answering party may not give lack of information or knowledge as a reason for failure to admit or deny unless stating that a reasonable inquiry was made and that the information known or readily obtainable is insufficient to enable an admission or denial. A party who considers that a matter of which an admission has been requested presents a genuine issue for trial, may not, on that ground alone, object to the request but may, subject to the provisions of R. 4:23-3, deny the matter or set forth reasons for not being able to admit or deny.
Requests for admission and answers thereto shall be served pursuant to R. 1:5-1 and shall not be filed unless the court otherwise directs.
The party who has requested the admissions may move to determine the sufficiency of the answers or objections. Unless the court determines that an objection is justified, it shall order that an answer be served. If the court determines that an answer does not comply with the requirements of this rule, it may order either that the matter is admitted or that an amended answer be served. The provisions of R. 4:23-1(c) apply to the award of expenses incurred in relation to the motion.
Rule 4:22-2. Effect of Admission
Any matter admitted under this rule is conclusively established unless the court on motion permits withdrawal or amendment of the admission. Subject to the provisions of R. 4:25-1 governing amendment of a pretrial order, the court may permit withdrawal or amendment when the presentation of the merits of the action will be subserved thereby and the party who obtained the admission fails to satisfy the court that withdrawal or amendment will be prejudicial to maintaining the action or defense on the merits. Any admission made by a party under this rule is for the purpose of the pending action only and is not an admission for any other purpose nor may it be used against that party in any other proceeding.
N.J. Ct. R. 4:22