Rib eater's delight: ribs, sauce and lots of paper towels. Here are some restaurants that specialize in ribs, where you can delight in someone else's secret recipe. ARBAUGH'S, 2606 Connecticut Avenue NW. For dinner, a half-slab of pork ribs with french fries, coleslaw and rolls is $7.50; a whole slab goes for $10.95. The barbecued chicken platter costs $6.95. Carryout available. Hours: daily, 5 to midnight. Phone: 234-8980. CRAZY HORSE BAR-B-Q RANCH, 6521 Riggs Road, Hyattsville. Pork ribs dinner starts at $6.25 for ribs and rolls and $6.75 for ribs, rolls and two vegetables. Sliced beef or pork sandwiches are $1.90, half-subs, $2.60; minced pork sandwich, $1.75, They make their own onion rings. Carryout available. Hours: Monday through Saturday, 11 to 10. Closed Sundays. Phone: 559-8558. DIXIE PIG, 6711 Richmond Highway, Alexandria. Pork ribs dinner with choice of two vegetables and roll is $5.45; minced barbecue dinner, $4.10. For lighter fare, the minced beef barbecue on a bun is $1.35; sliced pork barbecue on a bun, $1.75. Carryout available. Hours: Monday through Thursday, 6 a.m. to 12:30 a.m.; Friday and Saturday, 6 a.m. to 2 a.m.; Sunday, 7 a.m. to 11 p.m. Phone: 765-5353. MARKET HOUSE MEATS, 3276 M Street NW. An order of barbecued ribs weighs about a pound and costs $3.75 for beef or $3.95 for pork. Barbecued sliced beef or pork sandwich goes for $2.75; minced is $2.35; barbecued chicken, $1.89 a quarter pound, $3.19 a half. Add $1.15 to the above for a platter which includes choice of two: potato salad, cornbread, corn on the cob, baked beans or coleslaw. A slab of ribs for carryout -- about 3 1/2 pounds -- is $11.50, or $10.50 each for orders of three or more slabs. To order, call an hour or two in advance. Hours: Monday through Thursday, 10 to 9, Friday and Saturday, 10 to 11, Sunday, 10 to 7. Phone: 965-2200. O'BRIEN'S PIT BARBECUE, 1314 Gude Drive, Rockville. Pork rib dinner, $6.85, includes choice of two: beans, potato salad, corn on the cob or coleslaw. Chopped barbecue sandwich is $2.70; with vegetables, $3.90. Half a barbecued chicken, $3, platter $4. Eat there or carry out. Hours: Sunday through Thursday, 11 to 10; Friday and Saturday, 11 to 11. Phone: 340-8596. PEPPER'S TEXAS BAR-B-Q, 10824 Lee Highway, Fairfax. The pork rib platter, $5.25, comes with two vegetables and "Texas toast." Barbecued chicken platter is $4.50; minced pork sandwich, $2.55. Sunday is all- the-ribs-you-can-eat day, $7.95. Carryout available. Hours: Monday through Saturday, 11 to 10; Sunday, 12 to 9. Phone: 691- 1944. R.S.V.P. RESTAURANT, 401 M Street SW. Lunch of ribs with cornbread and two vegetables is $4.50; dinner is $10. Hours: Lunch is served Monday through Friday, 11:30 to 2:30, and dinner, Wednesday through Saturday, 6 to 11. Phone: 484-8900. THE RIB, 128 Rollins Avenue, Rockville. Everything comes with steakfries and slaw. Some dinnertime choices are pork rib dinner platter, $11.95, barbecued chicken and ribs combination, $10.50, barbecued chicken alone, $6.95. Served at lunch: minced pork barbecue sandwich, $3.95; luncheon ribs platter, $5.95; barbecued chicken, $5.95. Carryout available. Hours: Monday through Friday, 11:30 to 2:30, 5 to 9:30; Saturday, 5 to 9:30; Sunday, 5 to 8:30. Phone: 881-1970. SCOTT'S BAR-B-QUE PIT, 3066 Mount Pleasant Street NW. Scott's is strictly carryout. The pork ribs platter is $7.30, with cornbread and a choice of two vegetables from fresh greens, coleslaw, potato salad or red beans and rice. Barbecued chicken dinner (two pieces) is $4.90; the pork rib sandwich, $4.95; the chopped barbecue sandwich. $3.40. Hours Monday through Saturday 11 to 10. Closed Sundays. Phone: 332-1145.