lw27-1Specifications: All commercial and military tooth lockwashers supplied by WCL Company and listed on these pages conform to ASME B18.21.1 and to all applicable specifications as reported by IFI.

  • For use with flat and oval head screws having either 80° or 100° countersunk angles.
  • Where appearance or snagging are important considerations a version with a smooth external flange and internal teeth is available.

82° Countersunk – External Type

Nominal Washer SizeHole Dia. Min.Hole Dia. Max.Outside Dia. Min.Outside Dia. Max.ThicknessWCL Part NumbersCross ReferenceMS35336-1
Steel Plated
MS35336-1
Stainless Steel
MS35336-1
Bronze Alloy
20.0890.0950.170.1830.013CTSK-0086-00-001502-00
40.1130.1230.2240.2380.015CTSK-0112-00-001504-00-3-5-55
60.140.150.2830.2980.017CTSK-0138-00-001506-00-9-11-56
60.1420.150.2850.30.013CTSK-0138-02-001506-02
80.1670.1770.3240.340.017CTSK-0164-00-001508-00-15-17-57
100.1950.2050.3530.3720.022CTSK-0190-00-001510-00-21-23-58
120.220.2310.4290.4470.022CTSK-0216-00-001512-00
1/40.2550.2670.4580.4780.022CTSK-0250-00-001514-00-27-29-59
160.2730.2870.5230.5430.025CTSK-0281-00-001516-00
5/160.3180.3370.6030.6250.025CTSK-0312-00-001518-00-33-35-60
3/80.3830.3980.7760.8010.029CTSK-0375-00-001520-00-39-41-61
7/160.4480.4630.8630.890.035CTSK-0437-00-001522-00
7/160.4480.4630.890.9150.035CTSK-0437-02-001522-02
1/20.5120.5290.9771.0070.039CTSK-0500-00-001524-00-51-53-63
5/80.650.675REF.1.3120.051CTSK-0625-00-001528-00

100° Countersunk – External Type

Nominal Washer SizeHole Dia. Min.Hole Dia. Max.Outside Dia. Min.Outside Dia. Max.ThicknessWCL Part NumbersCross ReferenceMS35336-1
Steel Plated
MS35336-1
Stainless Steel
MS353361
Bronze Alloy
80.1680.1760.3240.340.015CTSK-0164-04-001508-04-9-123
100.1950.2040.3770.3940.017CTSK-0190-05-001510-05-17-125
1/40.2560.2670.4730.4930.022CTSK-0250-05-001514-05-25-127

82° Countersunk – Internal Flange Type

Nominal Washer SizeHole Dia. Min.Hole Dia. Max.Outside Dia. Min.Outside Dia. Max.ThicknessWCL Part NumbersCross Reference
80.2070.2150.6150.6350.025CTSK-0164-07-001508-07
5/160.340.3620.8020.8180.029CTSK-0312-04-001518-04*
* For 1/4″ HD screw 1 WCL acquires countersunk washers from our Vendors, and tests to certify performance to MS35336 specifications. Due to manufacturing tolerances some parts do not conform to military specifications. Inquire with WCL sales staff for more information.

82° Countersunk – Internal Flange Type

lw27-2

Screw Size456810121/45/163/8
A1/85/3211/6413/6415/641/49/3223/6427/64
B9/325/1611/3225/6429/6433/6437/6445/6427/32
C0.090.0950.10.110.1250.1550.1650.20.245
Countersinking specifications to accommodate 82° flat and oval head screws with WCL Countersunk Lockwashers

Note: Dimensions are approximate.