You have the old cylinder's box or an earlier order, and the number reads something like 7185-SC1-26D-KA2. That string holds the length, keyway, cam, finish and keying of the replacement, and Ilco's 2026 Brass Cylinder, Storefront Hardware and Replacement Hardware Catalog (PDF) sets out every field. Our product pages list these Ilco cylinders under the dormakaba brand.
How to read an Ilco cylinder number
The How to Order Cylinders pages (6 and 7) build the number from five fields in this order: model number, keyway, cam or tailpiece, finish and keying. Ilco's own example, 7165AA2-26D-KA2, is a standard 1 inch, 5-pin mortise cylinder with an Arrow keyway and an Adams Rite cam, in satin chrome, keyed alike in pairs. The number above splits the same way:
- 7185: mortise cylinder, 1-1/8 inches long, 5 pin (drilled 6)
- SC: Schlage C keyway
- 1: standard cam, part 863G
- 26D: satin chrome
- KA2: keyed alike in pairs
So SC1 is two fields, the keyway and the cam. Our product names print the codes with or without dashes: 7185SC126DKA2 is this cylinder, and 7165-SC2-26D-KA2 the 1 inch model with cam 2, the Adams Rite cam.
Mortise cylinder lengths and pins
Page 8 gives Ilco mortise cylinders a 1.150 x 32 UNS thread and a 1.360 inch face diameter. The model number fixes the length and the pin count. A selection from the keyed table:
| Model | Length (in) | Pins |
|---|---|---|
| 7155 | 15/16 | 5 |
| 7165 | 1 | 5 |
| 7185 | 1-1/8 | 5, drilled 6 |
| 7186 | 1-1/8 | 6 |
| 7205 | 1-1/4 | 5, drilled 7 |
| 7225 | 1-3/8 | 5, drilled 7 |
The full table has 11 lengths, from the 3/4 inch 7124 (4 pins) to 2 inches, with 7-pin models at 1-1/4 to 1-1/2 inches. From 1-5/8 inches up (7265 to 7326), models are listed with the Schlage C keyway only. Dummy (7120 to 7320) and turnknob (7121 to 7321) cylinders use the same lengths, with DC (dummy) or TK (turnknob) in the keyway field: 7160DC-26D is a 1 inch dummy, 7161TK2-26D a 1 inch turnknob with cam 2. Page 10 adds captive and classroom turnknobs.
Mortise cylinder cams
The catalog lists 17 cams. A selection, with the names and part numbers printed on page 7:
| Code | Cam | Part |
|---|---|---|
| 1 | Standard | 863G |
| 2 | Adams Rite | 863A |
| 3 | Clover | 863D |
| 4 | Narrow | 863E |
| 15 | Schlage L | 863M |
| 18 | Lori deadbolt | 863R |
Page 11 draws each cam with its main dimensions. The Adams Rite deadlocks themselves are covered in our Adams Rite model numbers guide.
Rim cylinders 7075 and 7076: tailpieces
According to page 14, the 7075 (5 pin) and 7076 (6 pin) rim cylinders are 1-1/8 inches long and are used on doors 1-3/8 to 2-1/4 inches thick. Each comes with a rigid tailpiece installed and a lazy action tailpiece in the box. For the cam or tailpiece field, page 7 gives three tailpiece codes:
- 10: long standard tailpiece 862B, 2-3/8 inches
- 14: long lazy action tailpiece 862L, 2-3/8 inches
- 26: extra long standard tailpiece 862C, 4 inches
Read that way, 7075KS1026D is a 5-pin rim cylinder in the Kwikset keyway (KS) with the 862B tailpiece, in satin chrome.
Key-in-knob cylinder 1599: 15985, 15995, 15996
Ilco lists the 1599 as a universal cylinder for knob and lever locksets, including Schlage, and for Arrow and Schlage deadbolts. It comes as 15985 (5 pin), 15995 (5 pin, drilled 6) and 15996 (6 pin). Six tailpieces are packed with it: three rigid ones in different lengths, one lazy tailpiece for a single deadbolt and two lazy ones for a double deadbolt. Page 18 lists each as a part:
| Part | For |
|---|---|
| 1599RS-00-10 | Knob or lever, short |
| 1599RM-00-10 | Knob or lever, medium |
| 1599RL-00-10 | Knob or lever, long |
| 1599LM-00-10 | Single deadbolt, long lazy |
| 1599DS-00-10 | Double deadbolt, short lazy |
| 1599DL-00-10 | Double deadbolt, long lazy |
Page 18 also lists a standard 6-piece 1599 tailpiece kit, 1599TPK-00-10. A number such as 15995-SC-26D-0B has no cam or tailpiece field: model 15995, Schlage C keyway, satin chrome, keying code 0B.
Keyway, finish and keying codes
Ilco lists 31 keyways. Page 6 prints each code next to a keyway name, such as AA for Arrow, KS for Kwikset and SC for Schlage C, and page 26 lists the replacement keys; key blanks are explained in our key blank guide. The finish field takes Ilco's finish codes, such as 26D (satin chrome) and 03 (bright brass), and the catalog notes that they do not reflect the product's base material. BHMA numbers are in our finish codes chart. Keying codes from page 7:
- KA: all keyed alike
- KD: keyed different
- KA2 and KA4: keyed alike in pairs, or in fours
- 0B: "0 bitted - Blade Height"
- MK and GMK: master keyed and grand master keyed, each with a second keying code, as in 7165AA2-26D-MK/KA2
Ilco 4500 deadbolt sold less cylinder
The 4500 is Ilco's mortise cylinder deadbolt. The catalog says it is sold with or without a cylinder and accepts a standard US thread mortise cylinder. Read with the order line on page 5, 45-1-4-04-26D-0 is the standard design (45), single cylinder (1; 2 is double cylinder), 2-3/4 inch backset with a 1-1/8 inch front (4), heavy duty strike (04), satin chrome (26D) and a complete deadbolt less cylinder (0). Page 4 matches the cylinder length to the door:
| Door thickness (in) | Cylinder (in) |
|---|---|
| 1-3/8 to 1-3/4 | 15/16 |
| 1-3/4 to 1-7/8 | 1 |
| 1-7/8 to 2-1/8 | 1-1/8 |
| 2-1/8 to 2-3/8 | 1-1/4 |
| 2-3/8 to 2-5/8 | 1-3/8 |
| 2-5/8 to 2-7/8 | 1-1/2 |
| 2-7/8 to 3-1/8 | 1-5/8 |
| 3-1/8 to 3-3/8 | 1-3/4 |
| 3-3/8 to 3-5/8 | 1-7/8 |
| 3-5/8 to 3-7/8 | 2 |
The catalog says the 4500 operates with a Lori fan shaped or an Adams Rite cam. The cam table lists the Lori deadbolt cam as code 18 (863R), and page 4 lists 863R-00-10 as the deadbolt fan cam for a mortise cylinder. Deadbolts in general are covered in our deadbolt guide.
Interchangeable core housings
The catalog also lists R2800 small format and S2600 large format housings for interchangeable cores. The housing order line on page 22 numbers the cams differently: 4 is the Schlage L cam there, while on a mortise cylinder 4 is the narrow cam. Core formats are compared in our SFIC vs LFIC guide.
Cylinders at The Builders Supply
- Mortise cylinders, rim cylinders and knob, lever and deadbolt cylinders
- Interchangeable cores and housings and deadbolts
- Cylinder guides for other brands: Schlage, GMS, GMS cores and knob cylinders and Corbin Russwin
Not sure which length, cam or tailpiece your door needs? Our customer support team is available Monday - Friday, 8 AM - 4 PM Central Time, at 1-888-800-7789 or [email protected].
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